CjTui/src/main.rs

mod core;

const PAGE_SIZE: usize = 50;

use std::{
    io::{self, Write, Read, BufRead, BufReader},
    path::PathBuf,
    process::{Child, Command, Stdio},
    time::{Duration, Instant},
    collections::HashSet,
    thread,
};

use std::sync::{Arc, Mutex, mpsc};

use std::os::unix::net::UnixStream;

use serde_json::Value;

use crate::core::downloads;
use crate::core::downloads::{DownloadCommand, DownloadManager, DownloadStatus};

use crossterm::{
    event::{self, Event, KeyCode, KeyEventKind},
    execute,
    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
};
use ratatui::{
    layout::{Constraint, Layout, Rect, Spacing},
    symbols::merge::MergeStrategy,
    widgets::{Block, List, ListItem, ListState, Paragraph, Wrap, Gauge},
    style::{Modifier, Style},
    text::Line,
    Frame, Terminal,
};
use ratatui::backend::CrosstermBackend;

#[derive(Clone)]
enum View {
    Categories,
    Library {
        title: String,
        query: core::jellyfin::LibraryQuery,
        items: Vec<core::jellyfin::JfItem>,
        selected: usize,
        start_index: usize,
        total: usize,
        page_size: usize,
        loading: bool,
    },
    OfflineLibrary {
        title: String,
        items: Vec<core::downloads::LocalEntry>,
        selected: usize,
    },
    Login,
}

#[derive(Clone, Debug, Default)]
struct MpvState {
    eof: bool,
    idle: bool,
    time_pos: Option<f64>,
    duration: Option<f64>,
    percent: Option<f64>,
    last_err: Option<String>,

    // new:
    media_title: Option<String>,
    audio: Option<String>,
    subs: Option<String>,
}

#[derive(Clone, Copy)]
enum LoginFocus {
    User,
    Pass,
}

#[derive(Clone, Copy, Debug)]
enum SearchMode {
    All,          // no filter (true "all")
    ShowsMovies,  // Movie + Series
    Shows,        // Series
    Movies,       // Movie
    Episodes,     // Episode
    Music,        // Audio
    Albums,       // MusicAlbum
    Artists,      // MusicArtist
}

impl SearchMode {
    fn next(self) -> Self {
        use SearchMode::*;
        match self {
            All => ShowsMovies,
            ShowsMovies => Shows,
            Shows => Movies,
            Movies => Episodes,
            Episodes => Music,
            Music => Albums,
            Albums => Artists,
            Artists => All,
        }
    }

    fn prev(self) -> Self {
        use SearchMode::*;
        match self {
            All => Artists,
            ShowsMovies => All,
            Shows => ShowsMovies,
            Movies => Shows,
            Episodes => Movies,
            Music => Episodes,
            Albums => Music,
            Artists => Albums,
        }
    }

    fn label(self) -> &'static str {
        use SearchMode::*;
        match self {
            All => "All",
            ShowsMovies => "Shows+Movies",
            Shows => "Shows",
            Movies => "Movies",
            Episodes => "Episodes",
            Music => "Music",
            Albums => "Albums",
            Artists => "Artists",
        }
    }

    fn include_item_types(self) -> Option<&'static str> {
        use SearchMode::*;
        match self {
            All => None, // IMPORTANT: truly unfiltered
            ShowsMovies => Some("Movie,Series"),
            Shows => Some("Series"),
            Movies => Some("Movie"),
            Episodes => Some("Episode"),
            Music => Some("Audio"),
            Albums => Some("MusicAlbum"),
            Artists => Some("MusicArtist"),
        }
    }
}

#[derive(Clone)]
enum SearchScope {
    All,
    Library {
        title: String,
        query: core::jellyfin::LibraryQuery,
    },
}

struct SearchState {
    mode: SearchMode,
    scope: SearchScope,
    input: String,
}

struct App {
    should_exit: bool,
    status: String,
    config_status: String,

    view_stack: Vec<View>,

    items: Vec<String>,
    selected: usize,

    config: Option<core::config::Config>,
    login_user: String,
    login_pass: String,
    login_focus: LoginFocus,
    login_error: Option<String>,
    offline: bool,

    search: Option<SearchState>,
    mpv: Option<MpvSession>,
    mpv_poll_last: Instant,
    mpv_state: MpvState,
    mpv_state_rx: Option<mpsc::Receiver<MpvState>>,
    debug_mpv: bool,
    mpv_now_playing: Option<String>,
    downloads: Option<downloads::DownloadManager>,
    downloads_focus: bool,
    downloads_selected: usize,
    downloaded_ids: HashSet<String>,
    last_download_message: Option<String>,

    autoplay: bool,
    autoplay_view_depth: usize,
    autoplay_next_index: Option<usize>,
    autoplay_eof_latched: bool,
    autoplay_prev_time_pos: Option<f64>,
}

#[derive(Debug)]
struct MpvSession {
    socket_path: PathBuf,
    child: Child,
}

impl Default for App {
    fn default() -> Self {
        let loaded = core::config::load_config().ok();

        let (view_stack, config_status, offline) = match &loaded {
            Some(cfg) if cfg.access_token.is_some() => {
                let online = core::jellyfin::JellyfinClient::ping_base_url(&cfg.base_url);
                if online {
                    (vec![View::Categories], format!("✅ Online: ({})", cfg.base_url), false)
                } else {
                    (vec![View::Categories], format!("📴 Offline: ({})", cfg.base_url), true)
                }
            }
            Some(cfg) => {
                // no token: treat as "not connected", but still allow offline browsing
                let online = core::jellyfin::JellyfinClient::ping_base_url(&cfg.base_url);
                if online {
                    (vec![View::Login], format!("Not Connected: ({})", cfg.base_url), false)
                } else {
                    (vec![View::Categories], format!("📴 Offline (no token): ({})", cfg.base_url), true)
                }
            }
            None => (vec![View::Login], "Missing Configuration".to_string(), false),
        };

        Self {
            should_exit: false,
            status: String::new(),
            config_status,
            config: loaded,

            view_stack,
            offline,

            items: categories_for_mode(offline),

            selected: 0,

            login_user: String::new(),
            login_pass: String::new(),
            login_focus: LoginFocus::User,
            login_error: None,
            search: None,
            mpv: None,
            mpv_poll_last: Instant::now(),
            mpv_state: MpvState::default(),
            mpv_state_rx: None,
            debug_mpv: false,
            mpv_now_playing: None,
            autoplay: false,
            autoplay_view_depth: 0,
            autoplay_next_index: None,
            autoplay_eof_latched: false,
            autoplay_prev_time_pos: None,
            downloads: None,
            downloads_focus: false,
            downloads_selected: 0,
            downloaded_ids: downloads::scan_downloaded_ids().unwrap_or_default(),
            last_download_message: None,

        }
    }
}

impl App {
    fn current_view(&self) -> &View {
        self.view_stack.last().unwrap()
    }
}

fn main() -> io::Result<()> {
    // Terminal setup
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;
    terminal.clear()?;

    let res = run_app(&mut terminal);

    // Terminal restore (always)
    disable_raw_mode()?;
    execute!(io::stdout(), LeaveAlternateScreen)?;
    terminal.show_cursor()?;

    res
}

fn run_app(terminal: &mut Terminal<CrosstermBackend<io::Stdout>>) -> io::Result<()> {
    let tick_rate = Duration::from_millis(16); // ~60fps
    let mut last_tick = Instant::now();
    let mut app = App::default();

    while !app.should_exit {
        terminal.draw(|f| ui(f, &app))?;

        let timeout = tick_rate.saturating_sub(last_tick.elapsed());
        if event::poll(timeout)? {
            if let Event::Key(key) = event::read()? {
                if key.kind == KeyEventKind::Press {
                    handle_key(&mut app, key.code);
                }
            }
        }

        if let Some(rx) = &app.mpv_state_rx {
            while let Ok(st) = rx.try_recv() {
                app.mpv_state = st;
            }
        }

        if app.debug_mpv {
            app.status = fmt_mpv_state(&app.mpv_state);
        }

        // --- mpv lifecycle (no borrow issues) ---
        let mpv_exited = match app.mpv.as_mut() {
            Some(mpv) => match mpv.child.try_wait() {
                Ok(Some(status)) => Some(status),
                _ => None,
            },
            None => None,
        };

        if let Some(status) = mpv_exited {
            // take ownership so we can clean up
            if let Some(mpv) = app.mpv.take() {
                let _ = std::fs::remove_file(&mpv.socket_path);
                app.status = format!("mpv exited: {status}");
            }

            // Your requirement: window closing disables autoplay
            app.autoplay = false;
            app.autoplay_next_index = None;
            app.mpv_now_playing = None;
            app.mpv_state_rx = None;
            app.mpv_state = MpvState::default();
        }

        // Refresh local-download index when downloads complete
        if let Some(dm) = &app.downloads {
            if let Ok(st) = dm.state.lock() {
                let msg = st.last_message.clone();

                if msg != app.last_download_message {
                    app.last_download_message = msg.clone();

                    if matches!(msg.as_deref(), Some("download complete")) {
                        app.downloaded_ids = downloads::scan_downloaded_ids().unwrap_or_default();
                    }
                }
            }
        }

        // Option A: always tick autoplay by polling eof-reached (window stays open)
        autoplay_tick(&mut app);


        if last_tick.elapsed() >= tick_rate {
            // tick-based updates go here later (smooth nav, download polling, etc.)
            last_tick = Instant::now();
        }
    }

    if let Some(dm) = &app.downloads {
        dm.send(downloads::DownloadCommand::Shutdown);
    }

    Ok(())
}

fn handle_key(app: &mut App, code: KeyCode) {
    // Special input handling in Login view
    if matches!(app.current_view(), View::Login) {
        match code {
            KeyCode::Char('q') => { app.should_exit = true; return; }
            KeyCode::Esc => { app.should_exit = true; return; }

            KeyCode::Tab => {
                app.login_focus = match app.login_focus {
                    LoginFocus::User => LoginFocus::Pass,
                    LoginFocus::Pass => LoginFocus::User,
                };
                return;
            }

            KeyCode::Backspace => {
                match app.login_focus {
                    LoginFocus::User => { app.login_user.pop(); }
                    LoginFocus::Pass => { app.login_pass.pop(); }
                }
                return;
            }

            KeyCode::Enter => {
                let cfg = match &app.config {
                    Some(c) => c.clone(),
                    None => {
                        app.login_error = Some("No config loaded. Create config.toml with base_url.".to_string());
                        return;
                    }
                };

                let client = core::jellyfin::JellyfinClient::unauthenticated(&cfg.base_url);
                match client.login_by_name(&app.login_user, &app.login_pass) {
                    Ok(res) => {
                        let mut new_cfg = cfg;
                        new_cfg.access_token = Some(res.access_token);
                        new_cfg.user_id = res.user_id;

                        if let Err(e) = core::config::save_config(&new_cfg) {
                            app.login_error = Some(format!("login ok but failed to write config: {e:?}"));
                            return;
                        }

                        app.config_status = format!("auth: token present ({})", new_cfg.base_url);
                        app.config = Some(new_cfg);
                        app.login_error = None;
                        app.login_pass.clear(); // don't keep password around
                        app.view_stack = vec![View::Categories];
                        app.status = "Logged in".to_string();
                    }
                    Err(e) => {
                        app.login_error = Some(e);
                    }
                }
                return;
            }

            KeyCode::Char(c) => {
                match app.login_focus {
                    LoginFocus::User => app.login_user.push(c),
                    LoginFocus::Pass => app.login_pass.push(c),
                }
                return;
            }

            _ => return,
        }
    }
    // If search mode is active, it captures input first
    if let Some(search) = &mut app.search {
        match code {
            KeyCode::Esc => { app.search = None; return; }
            KeyCode::Backspace => { search.input.pop(); return; }
            KeyCode::Enter => {
                let term = search.input.trim().to_string();
                if term.is_empty() {
                    app.search = None;
                    return;
                }

                let mode = search.mode;
                let types = mode.include_item_types().map(|s| s.to_string());

                let (title, mut query) = match &search.scope {
                    SearchScope::All => (
                        format!("Search: {}", term),
                        core::jellyfin::LibraryQuery::all().with_search(term.clone()),
                    ),
                    SearchScope::Library { title, query } => (
                        format!("{}: {}", title, term),
                        query.clone().with_search(term.clone()),
                    ),
                };

                // Override/force item types for the search mode
                query.include_item_types = types;

                app.search = None;

                // run search (same as your library fetch)
                let cfg = match &app.config { Some(c) => c.clone(), None => { app.status = "No config".into(); return; } };
                let user_id = match cfg.user_id.as_deref() { Some(u) => u, None => { app.status = "Missing user_id".into(); return; } };
                let client = match core::jellyfin::JellyfinClient::from_config(&cfg) { Ok(c) => c, Err(e) => { app.status = e; return; } };

                app.status = format!("Searching… {}", term);

                match client.list_items(user_id, query.clone(), 0, PAGE_SIZE) {
                    Ok(page) => {
                        app.view_stack.push(View::Library {
                            title,
                            query,
                            items: page.items,
                            selected: 0,
                            start_index: 0,
                            total: page.total,
                            page_size: PAGE_SIZE,
                            loading: false,
                        });
                        app.status = "Search loaded".into();
                    }
                    Err(e) => app.status = format!("Search failed: {e}"),
                }

                return;
            }
            KeyCode::Char('/') => {
                search.mode = search.mode.next();
                return;
            }
            KeyCode::Char('?') => {
                search.mode = search.mode.prev();
                return;
            }
            KeyCode::Char(c) => { search.input.push(c); return; }
            _ => return,
        }
    }

        // Normalize arrow navigation
    let code = match code {
        KeyCode::Right => KeyCode::Enter,
        KeyCode::Left => KeyCode::Esc,
        KeyCode::Char('l') => KeyCode::Enter,
        KeyCode::Char('h') => KeyCode::Esc,
        other => other,
    };

    // q behavior: if not home, go home; if home, quit
    if matches!(code, KeyCode::Char('q')) {
        app.autoplay = false;
        app.autoplay_next_index = None;
        if !matches!(app.current_view(), View::Categories) {
            app.view_stack = vec![View::Categories];
            app.selected = 0;
            app.status = "$".into();
            return;
        } else {
            app.should_exit = true;
            return;
        }
    }

    if matches!(code, KeyCode::Char('D')) {
        app.downloads_focus = !app.downloads_focus;
        app.downloads_selected = 0;
        app.status = if app.downloads_focus { "downloads: focus".into() } else { "downloads: unfocus".into() };
        return;
    }
    // Toggle offline/online mode.
    // - If currently online -> go offline immediately (latched until toggled back).
    // - If currently offline -> ping server; only switch to online if ping succeeds.
    if matches!(code, KeyCode::Char('o')) {
        let base_url = app
            .config
            .as_ref()
            .map(|c| c.base_url.clone())
            .unwrap_or_default();

        if !app.offline {
            // Online -> Offline (no ping needed)
            app.offline = true;
            app.items = categories_for_mode(true);
            app.selected = 0;
            app.view_stack = vec![View::Categories];

            // stop autoplay if it was running (offline shouldn't try to advance via network)
            app.autoplay = false;
            app.autoplay_next_index = None;
            app.autoplay_eof_latched = false;

            app.status = "📴 Offline mode enabled".into();
            return;
        }

        // Offline -> Online (must confirm server reachable)
        if base_url.is_empty() {
            app.status = "Cannot go online: missing base_url in config".into();
            return;
        }

        let ok = core::jellyfin::JellyfinClient::ping_base_url(&base_url);
        if ok {
            app.offline = false;
            app.items = categories_for_mode(false);
            app.selected = 0;
            app.view_stack = vec![View::Categories];
            app.status = "✅ Online mode enabled".into();
        } else {
            app.status = "Still offline: server not reachable".into();
        }
        return;
    }


    // --------------------
    // Downloads Focus Modal
    // --------------------
    if app.downloads_focus {
        match code {
            KeyCode::Esc => {
                app.downloads_focus = false;
                app.status = "downloads: unfocus".into();
                return;
            }

            KeyCode::Up | KeyCode::Char('k') => {
                if app.downloads_selected > 0 {
                    app.downloads_selected -= 1;
                }
                return;
            }

            KeyCode::Down | KeyCode::Char('j') => {
                let len = app
                    .downloads
                    .as_ref()
                    .and_then(|dm| dm.state.lock().ok())
                    .map(|st| st.queue.len())
                    .unwrap_or(0);

                if len > 0 && app.downloads_selected + 1 < len {
                    app.downloads_selected += 1;
                }
                return;
            }

            KeyCode::Char('d') => {
                if let Some(dm) = &app.downloads {
                    let idx = app.downloads_selected;

                    if idx == 0 {
                        dm.send(downloads::DownloadCommand::Cancel { index: 0 });
                        app.status = "download: cancel active".into();
                    } else {
                        dm.send(downloads::DownloadCommand::RemoveQueued { index: idx });
                        app.status = "download: removed".into();
                    }

                    // Clamp selection after removal
                    let len = dm
                        .state
                        .lock()
                        .ok()
                        .map(|st| st.queue.len())
                        .unwrap_or(0);

                    if len == 0 {
                        app.downloads_selected = 0;
                    } else if app.downloads_selected >= len {
                        app.downloads_selected = len - 1;
                    }
                } else {
                    app.status = "downloads not available".into();
                }
                return;
            }

            // Swallow everything else while focused.
            _ => return,
        }
    }


    // mpv controls (only when not typing into search/login)
    if app.search.is_none() && !matches!(app.current_view(), View::Login) {
        match code {
            KeyCode::Char('M') => {
                app.debug_mpv = !app.debug_mpv;
                app.status = format!("mpv debug: {}", if app.debug_mpv { "ON" } else { "OFF" });
                return;
            }
            KeyCode::Char('a') => {
                if let Some(mpv) = &app.mpv {
                    if let Err(e) = mpv_cycle_audio(mpv) {
                        app.status = format!("mpv audio: {e}");
                    }
                }
                return;
            }
            KeyCode::Char('s') => {
                if let Some(mpv) = &app.mpv {
                    if let Err(e) = mpv_cycle_subtitles(mpv) {
                        app.status = format!("mpv subs: {e}");
                    }
                }
                return;
            }
            KeyCode::Char('v') => {
                if let Some(mpv) = &app.mpv {
                    if let Err(e) = mpv_toggle_subs(mpv) {
                        app.status = format!("mpv sub vis: {e}");
                    }
                }
                return;
            }
            KeyCode::Char('x') => {
                app.autoplay = false;
                app.autoplay_next_index = None;
                if let Some(mut mpv) = app.mpv.take() {
                    mpv_stop(&mut mpv);
                    app.status = "Stopped mpv".into();
                }
                return;
            }
            KeyCode::Char('f') => {
                if let Some(mpv) = &app.mpv {
                    if let Err(e) = mpv_toggle_fullscreen(mpv) {
                        app.status = format!("mpv fullscreen: {e}");
                    }
                } else {
                    app.status = "mpv not running (press 'p' to play)".into();
                }
                return;
            }
            KeyCode::Char(' ') => {
                if let Some(mpv) = &app.mpv {
                    if let Err(e) = mpv_cycle_pause(mpv) {
                        app.status = format!("mpv pause: {e}");
                    }
                } else {
                    app.status = "mpv not running (press 'p' to play)".into();
                }
                return;
            }
            KeyCode::Char('p') => {
                app.autoplay = false;
                app.autoplay_next_index = None;

                // p = play selected item (spawn or replace)
                let cfg = match &app.config {
                    Some(c) => c.clone(),
                    None => { app.status = "No config loaded".into(); return; }
                };

                // Determine what is “selected” depending on view
                let (item_id, item_name) = match app.current_view() {
                    View::Library { items, selected, .. } if !items.is_empty() => {
                        (items[*selected].id.clone(), items[*selected].name.clone())
                    }
                    View::OfflineLibrary { items, selected, .. } if !items.is_empty() => {
                        (items[*selected].item_id.clone(), items[*selected].title.clone())
                    }
                    _ => { app.status = "Nothing to play here".into(); return; }
                };

                app.mpv_now_playing = Some(item_name);

                // If mpv running -> replace, else spawn
                let url = if let Some(p) = crate::core::downloads::local_media_path_for_item_id(&item_id) {
                    p.to_string_lossy().to_string()
                } else {
                    build_jellyfin_play_url(&cfg, &item_id)
                };

                if let Some(mpv) = &app.mpv {
                    match mpv_load_url(&cfg, mpv, &url) {
                        Ok(_) => app.status = "mpv: loaded".into(),
                        Err(e) => app.status = format!("mpv load failed: {e}"),
                    }
                } else {
                    match spawn_mpv_url(&cfg, &url) {
                        Ok(mpv) => {
                            let rx = start_mpv_poller(mpv.socket_path.clone());
                            app.mpv_state_rx = Some(rx);
                            app.mpv = Some(mpv);
                            app.status = "mpv: playing".into();
                        }
                        Err(e) => app.status = format!("mpv spawn failed: {e}"),
                    }
                }
                return;
            }
            KeyCode::Char('P') => {
                if matches!(app.current_view(), View::OfflineLibrary { .. }) {
                    app.status = "Offline: autoplay disabled (use 'p')".into();
                    return;
                }
                let cfg = match &app.config { Some(c) => c.clone(), None => { app.status="No config".into(); return; } };

                let (item_id, item_name, selected, len) = match app.current_view() {
                    View::Library { items, selected, .. } if !items.is_empty() => {
                        (items[*selected].id.clone(), items[*selected].name.clone(), *selected, items.len())
                    }
                    _ => { app.status = "Nothing to play here".into(); return; }
                };

                app.mpv_now_playing = Some(item_name);

                app.autoplay = true;
                app.status = format!("autoplay ON (next index: {:?})", app.autoplay_next_index);
                app.autoplay_prev_time_pos = None;
                app.autoplay_view_depth = app.view_stack.len();
                app.autoplay_next_index = if selected + 1 < len { Some(selected + 1) } else { None };

                // load/replace or spawn
                let url = if let Some(p) = crate::core::downloads::local_media_path_for_item_id(&item_id) {
                    p.to_string_lossy().to_string()
                } else {
                    build_jellyfin_play_url(&cfg, &item_id)
                };

                if let Some(mpv) = &app.mpv {
                    match mpv_load_url(&cfg, mpv, &url) {
                        Ok(_) => app.status = "mpv: playing (autoplay)".into(),
                        Err(e) => app.status = format!("mpv load failed: {e}"),
                    }
                } else {
                    match spawn_mpv_url(&cfg, &url) {
                        Ok(mpv) => {
                            let rx = start_mpv_poller(mpv.socket_path.clone());
                            app.mpv_state_rx = Some(rx);
                            app.mpv = Some(mpv);
                            app.status = "mpv: playing".into();
                        }
                        Err(e) => app.status = format!("mpv spawn failed: {e}"),
                    }
                }
                return;
            }
            KeyCode::Char('r') => {
                app.autoplay = false;
                app.autoplay_next_index = None;

                let cfg = match &app.config {
                    Some(c) => c.clone(),
                    None => { app.status = "No config loaded".into(); return; }
                };

                let (item_id, item_name, start_ticks) = match app.current_view() {
                    View::Library { items, selected, .. } if !items.is_empty() => {
                        let it = &items[*selected];
                        let ty = it.item_type.as_deref().unwrap_or("");
                        if ty != "Episode" && ty != "Movie" {
                            app.status = "Resume only works on Episodes/Movies (for now).".into();
                            return;
                        }
                        (it.id.clone(), it.name.clone(), playback_position_ticks(it))
                    }
                    _ => { app.status = "Nothing to resume here".into(); return; }
                };

                app.mpv_now_playing = Some(item_name);

                let url = build_jellyfin_play_url(&cfg, &item_id);

                if let Some(mpv) = &app.mpv {
                    match mpv_cmd(&mpv.socket_path, &format!(r#"{{"command":["loadfile","{}","replace"]}}"#, url)) {
                        Ok(_) => {
                            if let Some(t) = start_ticks {
                                let _ = mpv_seek_absolute(&mpv.socket_path, ticks_to_seconds(t));
                            }
                            app.status = "mpv: resumed".into();
                        }
                        Err(e) => app.status = format!("mpv resume failed: {e}"),
                    }
                } else {
                    match spawn_mpv_url(&cfg, &url) {
                        Ok(mpv) => {
                            let rx = start_mpv_poller(mpv.socket_path.clone());
                            app.mpv_state_rx = Some(rx);
                            let sock = mpv.socket_path.clone();
                            app.mpv = Some(mpv);
                            if let Some(t) = start_ticks {
                                let _ = mpv_seek_absolute(&sock, ticks_to_seconds(t));
                            }
                            app.status = "mpv: resumed".into();
                        }
                        Err(e) => app.status = format!("mpv spawn failed: {e}"),
                    }
                }
                return;
            }
            KeyCode::Char('R') => {
                // resume + autoplay
                let cfg = match &app.config { Some(c) => c.clone(), None => { app.status="No config".into(); return; } };

                let (item_id, item_name, selected, len, start_ticks) = match app.current_view() {
                    View::Library { items, selected, .. } if !items.is_empty() => {
                        let it = &items[*selected];
                        let ty = it.item_type.as_deref().unwrap_or("");
                        if ty != "Episode" && ty != "Movie" {
                            app.status = "Resume only works on Episodes/Movies (for now).".into();
                            return;
                        }
                        (it.id.clone(), it.name.clone(), *selected, items.len(), playback_position_ticks(it))
                    }
                    _ => { app.status = "Nothing to resume here".into(); return; }
                };

                app.mpv_now_playing = Some(item_name);

                app.autoplay = true;
                app.autoplay_prev_time_pos = None;
                app.autoplay_view_depth = app.view_stack.len();
                app.autoplay_next_index = if selected + 1 < len { Some(selected + 1) } else { None };
                app.autoplay_eof_latched = false;

                let url = build_jellyfin_play_url(&cfg, &item_id);

                if let Some(mpv) = &app.mpv {
                    match mpv_cmd(&mpv.socket_path, &format!(r#"{{"command":["loadfile","{}","replace"]}}"#, url)) {
                        Ok(_) => {
                            if let Some(t) = start_ticks {
                                let _ = mpv_seek_absolute(&mpv.socket_path, ticks_to_seconds(t));
                            }
                            app.status = "mpv: resumed (autoplay)".into();
                        }
                        Err(e) => app.status = format!("mpv resume failed: {e}"),
                    }
                } else {
                    match spawn_mpv_url(&cfg, &url) {
                        Ok(mpv) => {
                            let rx = start_mpv_poller(mpv.socket_path.clone());
                            app.mpv_state_rx = Some(rx);
                            let sock = mpv.socket_path.clone();
                            app.mpv = Some(mpv);
                            if let Some(t) = start_ticks {
                                let _ = mpv_seek_absolute(&sock, ticks_to_seconds(t));
                            }
                            app.status = "mpv: resumed (autoplay)".into();
                        }
                        Err(e) => app.status = format!("mpv spawn failed: {e}"),
                    }
                }
                return;
            }
            _ => {}
        }
    }

    // downloads focus overrides normal navigation
    // downloads focus overrides normal navigation
    let mut handled_by_downloads = false;

    if app.downloads_focus {
        if let Some(dm) = &app.downloads {
            let idx = app.downloads_selected;

            if idx == 0 {
                dm.send(downloads::DownloadCommand::Cancel { index: 0 });
                app.status = "download: cancel active".into();
            } else {
                dm.send(downloads::DownloadCommand::RemoveQueued { index: idx });
                app.status = "download: removed".into();
            }

            // Clamp selection immediately to avoid focus navigation glitches
            let len = dm
                .state
                .lock()
                .ok()
                .map(|st| st.queue.len())
                .unwrap_or(0);

            if len == 0 {
                app.downloads_selected = 0;
            } else if app.downloads_selected >= len {
                app.downloads_selected = len - 1;
            }
        } else {
            app.status = "downloads not available".into();
        }
        return;
    }

    // If downloads handled the key, skip normal navigation handling
    if handled_by_downloads {
        return;
    }

    match code {
        KeyCode::Char('d') => {
            let cfg = match &app.config {
                Some(c) => c.clone(),
                None => { app.status = "No config loaded".into(); return; }
            };
            let user_id = match cfg.user_id.as_deref() {
                Some(u) => u,
                None => { app.status = "No user_id (login first)".into(); return; }
            };

            let (it) = match app.current_view() {
                View::Library { items, selected, .. } if !items.is_empty() => items[*selected].clone(),
                _ => { app.status = "Nothing to download here".into(); return; }
            };

            let dm = match &app.downloads {
                Some(dm) => dm,
                None => {
                    // try start downloads now if we have a token
                    if cfg.access_token.is_some() {
                        app.downloads = Some(downloads::DownloadManager::start(cfg.clone()));
                        app.downloads.as_ref().unwrap()
                    } else {
                        app.status = "Not connected".into();
                        return;
                    }
                }
            };

            let jf = match core::jellyfin::JellyfinClient::from_config(&cfg) {
                Ok(c) => c,
                Err(e) => { app.status = format!("downloads: {e}"); return; }
            };

            match downloads::expand_for_enqueue(&jf, user_id, &it) {
                Ok(items) => {
                    let n = items.len();
                    dm.send(downloads::DownloadCommand::Enqueue(items));
                    app.status = format!("queued {n}");
                }
                Err(e) => app.status = format!("queue failed: {e}"),
            }
            return;
        }

        KeyCode::Char('q') => app.should_exit = true,

        //Enter code Block
        KeyCode::Enter => {
            let view = app.current_view().clone();

    match view {
        View::Categories => {
            let cat = app.items[app.selected].clone();

            // OFFLINE: local-only library
            if app.offline {
                if cat == "Downloaded" {
                    let items = crate::core::downloads::scan_local_entries();

                    app.view_stack.push(View::OfflineLibrary {
                        title: "Downloaded".into(),
                        items,
                        selected: 0,
                    });
                    app.status = "$".into();
                    return;
                }

                // Everything else offline can remain as-is (Downloads/Settings etc)
            }

            let cfg = match &app.config {
                Some(c) => c.clone(),
                None => { app.status = "No config loaded".into(); return; }
            };

            let user_id = match cfg.user_id.as_deref() {
                Some(u) => u,
                None => { app.status = "Missing user_id in config (login again)".into(); return; }
            };

            let client = match core::jellyfin::JellyfinClient::from_config(&cfg) {
                Ok(c) => c,
                Err(e) => { app.status = e; return; }
            };

            // Special case: Libraries uses /Views, not /Items
            if cat == "Libraries" {
                app.status = "Fetching Libraries...".into();
                match client.list_views(user_id) {
                    Ok(items) => {
                        let total = items.len();
                        app.view_stack.push(View::Library {
                            title: "Libraries".into(),
                            query: core::jellyfin::LibraryQuery::all(), // placeholder
                            items,
                            selected: 0,
                            start_index: 0,
                            total, // cheap total for UI
                            page_size: PAGE_SIZE,
                            loading: false,
                        });
                        app.status = "Loaded".into();
                    }
                    Err(e) => app.status = format!("Views failed: {e}"),
                }
                return;
            }

            // Normal categories use /Items
            let query = match cat.as_str() {
                "Movies" => core::jellyfin::LibraryQuery::movies(),
                "Shows" => core::jellyfin::LibraryQuery::shows(),
                "Music" => core::jellyfin::LibraryQuery::music(),
                "Playlists" => core::jellyfin::LibraryQuery::all().with_item_types("Playlist"),

                // NEW
                "Collections" => core::jellyfin::LibraryQuery::all()
                    .with_item_types("BoxSet"),

                "Continue Watching" => core::jellyfin::LibraryQuery::all()
                    .with_item_types("Episode,Movie")
                    .with_filters("IsResumable")
                    .with_sort_by("DatePlayed")
                    .with_sort_order("Descending"),

                "Recently Added" => core::jellyfin::LibraryQuery::all()
                    .with_item_types("Movie,Series")
                    .with_sort_by("DateCreated,SortName")
                    .with_sort_order("Descending"),

                _ => { app.status = format!("Not wired yet: {}", cat); return; }
            };

            app.status = format!("Fetching {}...", cat);

            match client.list_items(user_id, query.clone(), 0, PAGE_SIZE) {
                Ok(page) => {
                    app.view_stack.push(View::Library {
                        title: cat,
                        query,
                        items: page.items,
                        selected: 0,
                        start_index: 0,
                        total: page.total,
                        page_size: PAGE_SIZE,
                        loading: false,
                    });
                    app.status = "$".into();
                }
                Err(e) => app.status = format!("Fetch failed: {e}"),
            }
        }

        View::Library { title, items, selected, .. } => {
            if items.is_empty() { return; }
            let it = &items[selected];

            let ty = it.item_type.as_deref().unwrap_or("");

            // Libraries (/Views) usually return CollectionFolder. Entering it should list its contents.
            if ty == "CollectionFolder" {
                let q = core::jellyfin::LibraryQuery::all().with_parent(it.id.clone());
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            // Shows -> Seasons -> Episodes
            if ty == "Series" {
                let q = core::jellyfin::LibraryQuery::all()
                    .with_parent(it.id.clone())
                    .with_item_types("Season");
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            if ty == "Season" {
                let q = core::jellyfin::LibraryQuery::all()
                    .with_parent(it.id.clone())
                    .with_item_types("Episode");
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            // MusicArtist -> MusicAlbum -> Audio
            if ty == "MusicArtist" {
                let q = core::jellyfin::LibraryQuery::all()
                    .with_parent(it.id.clone())
                    .with_item_types("MusicAlbum");
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            if ty == "MusicAlbum" {
                let q = core::jellyfin::LibraryQuery::all()
                    .with_parent(it.id.clone())
                    .with_item_types("Audio");
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            if ty == "BoxSet" {
                let q = core::jellyfin::LibraryQuery::all().with_parent(it.id.clone());
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            if ty == "UserView" {
                // Most UserViews are libraries like Shows/Movies/Music/Playlists.
                // For Playlists view, drill into playlists.
                let q = core::jellyfin::LibraryQuery::all()
                    .with_parent(it.id.clone())
                    .with_item_types("Playlist");
                open_children(app, format!("{} > {}", title, it.name), q);
                return;
            }
            if ty == "Playlist" {
                let cfg = match &app.config { Some(c) => c.clone(), None => { app.status="No config".into(); return; } };
                let user_id = match cfg.user_id.as_deref() { Some(u) => u, None => { app.status="Missing user_id".into(); return; } };
                let client = match core::jellyfin::JellyfinClient::from_config(&cfg) { Ok(c)=>c, Err(e)=>{ app.status=e; return; } };

                match client.playlist_items(user_id, &it.id, 0, PAGE_SIZE) {
                    Ok(page) => {
                        app.view_stack.push(View::Library {
                            title: format!("{} > {}", title, it.name),
                            // store a query placeholder; playlist paging could be done later if you want
                            query: core::jellyfin::LibraryQuery::all(),
                            items: page.items,
                            selected: 0,
                            start_index: 0,
                            total: page.total,
                            page_size: PAGE_SIZE,
                            loading: false,
                        });
                        app.status = "$".into();
                    }
                    Err(e) => app.status = format!("Playlist load failed: {e}"),
                }
                return;
            }
            // Playables -> mpv
            // Playables: do nothing on Enter (use 'p' to play)
            if ty == "Episode" || ty == "Audio" || ty == "Movie" {
                app.status = "Press 'p' to play, or 'P' for autoplay.".into();
                return;
            }

            app.status = format!("No drilldown for type: {}", ty);
        }

        _ => {}
    }
}


        KeyCode::Esc | KeyCode::Backspace => {
            if app.view_stack.len() > 1 {
                app.view_stack.pop();
                app.status = "$".to_string();
                app.selected = 0;
            }
        }
        KeyCode::Up | KeyCode::Char('k') => {
            match app.view_stack.last_mut().unwrap() {
                View::Categories => {
                    if app.items.is_empty() { return; }
                    if app.selected == 0 { app.selected = app.items.len() - 1; }
                    else { app.selected -= 1; }
                    //app.status = format!("Selected: {}", app.items[app.selected]);
                    app.status = "$".into();
                }
                View::Library { items, selected, total, .. } => {
                    if items.is_empty() { return; }

                    if *selected == 0 {
                        // wrap-up wants the real end
                        if items.len() < *total {
                            ensure_loaded_to_end(app);
                        }

                        if let Some(View::Library { items, selected, .. }) = app.view_stack.last_mut() {
                            if !items.is_empty() {
                                *selected = items.len() - 1;
                            }
                        }
                    } else {
                        *selected -= 1;
                    }

                    maybe_prefetch(app);
                }
                View::OfflineLibrary { items, selected, .. } => {
                    if items.is_empty() { return; }
                    if *selected == 0 { *selected = items.len() - 1; }
                    else { *selected -= 1; }
                }
                _ => {}
            }
        }
        KeyCode::Down | KeyCode::Char('j') => {
            match app.view_stack.last_mut().unwrap() {
                View::Categories => {
                    if app.items.is_empty() { return; }
                    app.selected = (app.selected + 1) % app.items.len();
                    //app.status = format!("Selected: {}", app.items[app.selected]);
                    app.status = "$".into();
                }
                View::Library { items, selected, total, .. } => {
                    if items.is_empty() { return; }

                    // If we're at the end of what we have loaded…
                    if *selected + 1 >= items.len() {
                        // …and there’s more available on the server, fetch next page.
                        if items.len() < *total {
                            load_next_library_page(app);

                            // After loading more, move down if possible.
                            if let Some(View::Library { items, selected, .. }) = app.view_stack.last_mut() {
                                if !items.is_empty() && *selected + 1 < items.len() {
                                    *selected += 1;
                                }
                            }
                        } else {
                            *selected = 0;
                        }
                    } else {
                        *selected += 1;
                    }

                    maybe_prefetch(app);
                }
                View::OfflineLibrary { items, selected, .. } => {
                    if items.is_empty() { return; }
                    *selected = (*selected + 1) % items.len();
                }

                _ => {}
            }
        }
        KeyCode::Char('/') => {
            let scope = match app.current_view() {
                View::Categories => SearchScope::All,
                View::Library { title, query, .. } => SearchScope::Library {
                    title: title.clone(),
                    query: query.clone(),
                },
                _ => SearchScope::All,
            };

            app.search = Some(SearchState {
                scope,
                mode: SearchMode::All,
                input: String::new(),
            });
        }
        _ => {}
    }
}

fn load_next_library_page(app: &mut App) {
    // pull info + mark loading
    let (query, next_start, total, page_size) = match app.view_stack.last_mut() {
        Some(View::Library { query, items, total, start_index, loading, page_size, .. }) => {
            if *loading { return; }
            *loading = true;
            let loaded = items.len();
            let next_start = *start_index + loaded;
            (query.clone(), next_start, *total, *page_size)
        }
        _ => return,
    };

    let cfg = match &app.config {
        Some(c) => c.clone(),
        None => { app.status = "No config loaded".to_string(); finish_loading(app); return; }
    };

    let user_id = match cfg.user_id.as_deref() {
        Some(u) => u,
        None => { app.status = "Missing user_id in config (login again)".to_string(); finish_loading(app); return; }
    };

    let client = match core::jellyfin::JellyfinClient::from_config(&cfg) {
        Ok(c) => c,
        Err(e) => { app.status = e; finish_loading(app); return; }
    };

    let page = match client.list_items(user_id, query.clone(), next_start, page_size) {
        Ok(p) => p,
        Err(e) => { app.status = format!("Fetch failed: {e}"); finish_loading(app); return; }
    };

    if let Some(View::Library { items, total, .. }) = app.view_stack.last_mut() {
        items.extend(page.items);
        *total = page.total;
    }

    finish_loading(app);
}

fn finish_loading(app: &mut App) {
    if let Some(View::Library { loading, .. }) = app.view_stack.last_mut() {
        *loading = false;
    }
}

fn maybe_prefetch(app: &mut App) {
    const PREFETCH_ROWS: usize = 0;

    let should = match app.view_stack.last() {
        Some(View::Library { items, selected, total, loading, .. }) => {
            if *loading { false }
            else if items.len() >= *total { false }
            else {
                let remaining_loaded = items.len().saturating_sub(*selected);
                remaining_loaded <= PREFETCH_ROWS
            }
        }
        _ => false,
    };

    if should {
        load_next_library_page(app);
    }
}

fn ensure_loaded_to_end(app: &mut App) {
    loop {
        let done = match app.view_stack.last() {
            Some(View::Library { items, total, loading, .. }) => {
                !*loading && items.len() >= *total
            }
            _ => true,
        };
        if done { break; }

        load_next_library_page(app);
    }
}

fn ticks_to_runtime_str(ticks: Option<i64>) -> Option<String> {
    // Jellyfin ticks are 10,000,000 per second
    let t = ticks?;
    if t <= 0 { return None; }

    let total_seconds = (t as u64 / 10_000_000) as u64;
    let minutes = total_seconds / 60;
    let seconds = total_seconds % 60;

    if minutes >= 60 {
        let h = minutes / 60;
        let m = minutes % 60;
        Some(format!("{h}h {m}m"))
    } else {
        Some(format!("{minutes}m {seconds:02}s"))
    }
}

fn join_artists(artists: &[String]) -> String {
    let names: Vec<String> = artists
        .iter()
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty())
        .collect();

    if names.is_empty() { "-".into() } else { names.join(", ") }
}

fn first_nonempty(opt: &Option<String>) -> Option<String> {
    opt.as_deref()
        .map(|s| s.trim())
        .filter(|s| !s.is_empty())
        .map(|s| s.to_string())
}

fn join_genres(genres: &[String]) -> String {
    if genres.is_empty() { "-".into() } else { genres.join(", ") }
}

fn join_studios(studios: &[core::jellyfin::JfStudio]) -> String {
    let names: Vec<String> = studios
        .iter()
        .map(|s| s.name.clone())
        .filter(|s| !s.trim().is_empty())
        .collect();

    if names.is_empty() { "-".into() } else { names.join(", ") }
}

fn year_str(y: Option<i32>) -> String {
    y.map(|v| v.to_string()).unwrap_or_else(|| "-".into())
}

fn overview_str(o: &Option<String>) -> String {
    o.as_deref()
        .map(|s| s.trim())
        .filter(|s| !s.is_empty())
        .unwrap_or("-")
        .to_string()
}

fn format_details(it: &core::jellyfin::JfItem) -> String {
    let ty = it.item_type.as_deref().unwrap_or("");

    match ty {
        "Series" => format!(
            "Name: {}\nYear: {}\nGenres: {}\nStudio: {}\n\nOverview:\n{}",
            it.name,
            year_str(it.production_year),
            join_genres(&it.genres),
            join_studios(&it.studios),
            overview_str(&it.overview),
        ),

        "Movie" => {
            let mut header = format!(
                "Name: {}\nYear: {}\nRuntime: {}\nGenres: {}\nStudio: {}",
                it.name,
                year_str(it.production_year),
                ticks_to_runtime_str(it.run_time_ticks).unwrap_or_else(|| "-".into()),
                join_genres(&it.genres),
                join_studios(&it.studios),
            );

            if is_in_progress_fast(it) {
                let pos = playback_position_ticks(it).unwrap_or(0);
                let pos_secs = (pos / 10_000_000) as f64;
                header.push_str(&format!(
                    "\nIn progress ({}): press r/R to resume.",
                    fmt_hms(pos_secs)
                ));
            }

            format!(
                "{}\n\nOverview:\n{}",
                header,
                overview_str(&it.overview),
            )
        }

        "Episode" => {
            let series = it.series_name.clone().unwrap_or_else(|| "-".into());
            let se = match (it.parent_index_number, it.index_number) {
                (Some(s), Some(e)) => format!("{:02}x{:02}", s, e),
                _ => "-".into(),
            };

            let mut header = format!(
                "Series: {}\nEpisode: {}  {}\nYear: {}",
                series,
                se,
                it.name,
                year_str(it.production_year),
            );

            if is_in_progress_fast(it) {
                let pos = playback_position_ticks(it).unwrap_or(0);
                let pos_secs = (pos / 10_000_000) as f64;
                header.push_str(&format!(
                    "\nIn progress ({}): press r/R to resume.",
                    fmt_hms(pos_secs)
                ));
            }

            format!(
                "{}\n\nOverview:\n{}",
                header,
                overview_str(&it.overview),
            )
        }

        // --- Songs ---
        "Audio" => {
            let artist = first_nonempty(&it.album_artist)
                .or_else(|| it.artists.get(0).cloned())
                .unwrap_or_else(|| "-".into());

            let album = first_nonempty(&it.album).unwrap_or_else(|| "-".into());

            format!(
                "Name: {}\nRuntime: {}\nArtist: {}\nAlbum: {}\nYear: {}",
                it.name,
                ticks_to_runtime_str(it.run_time_ticks).unwrap_or_else(|| "-".into()),
                artist,
                album,
                year_str(it.production_year),
            )
        }

        // --- Albums ---
        "MusicAlbum" => {
            let artist = first_nonempty(&it.album_artist)
                .or_else(|| it.artists.get(0).cloned())
                .unwrap_or_else(|| "-".into());

            format!(
                "Name: {}\nRuntime: {}\nArtist: {}\nYear: {}",
                it.name,
                ticks_to_runtime_str(it.run_time_ticks).unwrap_or_else(|| "-".into()),
                artist,
                year_str(it.production_year),
            )
        }

        // --- Artists ---
        "MusicArtist" => format!("Name: {}", it.name),

        _ => format!(
            "Name: {}\nId: {}\nType: {:?}\nYear: {:?}",
            it.name, it.id, it.item_type, it.production_year
        ),
    }
}

fn ui(frame: &mut Frame, app: &App) {
    let area = frame.area();
    let panes = layout(area);

    // Top
    //frame.render_widget(
    //    Paragraph::new("cj-jftui").block(Block::bordered()),
    //    panes.top,
    //);
    
    let top_block = Block::bordered();
    frame.render_widget(top_block.clone(), panes.top);

    let top_inner = top_block.inner(panes.top);
    let [top_l, top_r] = Layout::horizontal([Constraint::Fill(1), Constraint::Length(40)])
        .areas(top_inner);

    frame.render_widget(Paragraph::new("cj-jftui"), top_l);
    let server = app
        .config
        .as_ref()
        .map(|c| c.base_url.clone())
        .unwrap_or_else(|| "-".into());

    frame.render_widget(
        Paragraph::new(server)
            .alignment(ratatui::layout::Alignment::Right),
        top_r,
    );

    // Main

    match app.current_view() {
        View::OfflineLibrary { title, items, selected } => {
            render_offline_library(frame, title, items, *selected, panes.left_main, panes.right_main);
        }
        View::Categories => {
            render_categories(frame, app, panes.left_main, panes.right_main);
        }
        View::Library { title, query, items, selected, start_index, total, .. } => {
            let is_audio = query
                .include_item_types
                .as_deref()
                .map(|t| t.split(',').any(|x| x.trim() == "Audio"))
                .unwrap_or(false);

            let show_audio_track_numbers = is_audio && query.parent_id.is_some();

            render_library(
                frame,
                app,
                title,
                *start_index,
                *total,
                items,
                *selected,
                panes.left_main,
                panes.right_main,
                show_audio_track_numbers,
            );
        }
        View::Login => {
            render_login(frame, app, panes.left_main, panes.right_main);
        }
    }

    // Bottom Left
    // ---- Bottom Left: prompt / mpv ----
    // Bottom Left: Search (temporary) > MPV (persistent) > "$"
    if let Some(s) = &app.search {
        let scope = match &s.scope {
            SearchScope::All => "All".to_string(),
            SearchScope::Library { title, .. } => title.clone(),
        };
        let mode = s.mode.label();
        let line = if s.input.is_empty() {
            format!("/ ({scope}) [{mode}]")
        } else {
            format!("/ ({scope}) [{mode}] {}", s.input)
        };

        frame.render_widget(
            Paragraph::new(line).block(Block::bordered().merge_borders(MergeStrategy::Exact)),
            panes.left_output,
        );
    } else if app.downloads_focus || app.downloads.as_ref().map(|d| d.state.lock().map(|s| !s.queue.is_empty()).unwrap_or(false)).unwrap_or(false) {
        render_downloads_panel(frame, app, panes.left_output);
    } else if app.mpv.is_some() {
        // mpv panel takes over the whole bottom-left area
        render_mpv_panel(frame, app, panes.left_output);
    } else {
        frame.render_widget(
            Paragraph::new("$").block(Block::bordered().merge_borders(MergeStrategy::Exact)),
            panes.left_output,
        );
    }

    // ---- Bottom Right: always-on status/help ----
    let connected = if app.offline {
        "📴 Offline"
    } else if app.config.as_ref().and_then(|c| c.access_token.as_ref()).is_some() {
        "✅ Connected"
    } else {
        "❌ Disconnected"
    };

    let server = app
        .config
        .as_ref()
        .map(|c| c.base_url.as_str())
        .unwrap_or("-");

    let right_text = format!(
        "{connected}\n\np/P:   play/autoplay
r/R:   resume/autoplay
d:     download / cancel
q:     quit
/help: more help"
    );

    frame.render_widget(
        Paragraph::new(right_text)
            .wrap(Wrap { trim: false })
            .block(Block::bordered().merge_borders(MergeStrategy::Exact)),
        panes.right_output,
    );
}

fn compute_window(len: usize, selected: usize, viewport: usize) -> (usize, usize) {
    if len == 0 || viewport == 0 {
        return (0, 0);
    }

    let viewport = viewport.min(len);
    let half = viewport / 2;

    let mut start = selected.saturating_sub(half);
    if start + viewport > len {
        start = len - viewport;
    }

    let end = start + viewport;
    (start, end)
}

fn render_categories(frame: &mut Frame, app: &App, left: Rect, right: Rect) {
    // how many rows can we show inside the bordered block?
    let viewport = left.height.saturating_sub(2) as usize;

    let len = app.items.len();
    let selected = app.selected.min(len.saturating_sub(1));

    let (start, end) = compute_window(len, selected, viewport);

    let items: Vec<ListItem> = app.items[start..end]
        .iter()
        .map(|s| ListItem::new(s.as_str()))
        .collect();

    let list = List::new(items)
        .block(Block::bordered().title("Categories").merge_borders(MergeStrategy::Exact))
        .highlight_symbol("> ")
        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));

    let mut state = ListState::default();
    state.select(Some(selected - start)); // selection relative to slice

    frame.render_stateful_widget(list, left, &mut state);

    // Right pane details (use the real selected item)
    frame.render_widget(
        Paragraph::new("")
            .block(Block::bordered().merge_borders(MergeStrategy::Exact)),
        right,
    );
}

fn render_placeholder(frame: &mut Frame, name: &str, left: Rect, right: Rect) {
    frame.render_widget(
        Paragraph::new(format!("Inside {}\n\nPress Esc to go back", name))
            .block(Block::bordered().title("Library").merge_borders(MergeStrategy::Exact)),
        left,
    );

    frame.render_widget(
        Paragraph::new("Right pane reserved for item details / thumbnails")
            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
        right,
    );
}

fn render_library(
    frame: &mut Frame,
    app: &App,
    title: &str,
    start_index: usize,
    total: usize,
    items: &[core::jellyfin::JfItem],
    selected: usize,
    left: Rect,
    right: Rect,
    show_audio_track_numbers: bool,
) {
    let viewport = left.height.saturating_sub(2) as usize;

    let len = items.len();
    let selected = selected.min(len.saturating_sub(1));

    let (start, end) = compute_window(len, selected, viewport);

    fn show_year_for(item_type: Option<&str>) -> bool {
        matches!(item_type, Some("Movie" | "Series" | "MusicAlbum"))
    }

    fn left_number_prefix(it: &core::jellyfin::JfItem, show_audio_track_numbers: bool) -> String {
        match it.item_type.as_deref() {
            Some("Episode") => {
                match (it.parent_index_number, it.index_number) {
                    (Some(season), Some(ep)) => format!("{:02}x{:02} ", season, ep),
                    (_, Some(ep)) => format!("{:02} ", ep),
                    _ => String::new(),
                }
            }
            Some("Audio") => {
                if !show_audio_track_numbers {
                    return String::new();
                }
                match it.index_number {
                    Some(n) => format!("{:02}. ", n),
                    None => String::new(),
                }
            }
            _ => String::new(),
        }
    }

    let list_items: Vec<ListItem> = items[start..end]
        .iter()
        .filter(|it| {
            // Hide the redundant "collections" folder inside the Collections library
            if title.ends_with("Collections") {
                if it.item_type.as_deref() == Some("Folder")
                    && it.name.eq_ignore_ascii_case("collections")
                {
                    return false;
                }
            }
            true
        })
        .map(|it| {
            let emoji = emoji_prefix_for(app, it);
            let prefix = left_number_prefix(it, show_audio_track_numbers);
            let year = if show_year_for(it.item_type.as_deref()) {
                it.production_year.map(|y| format!(" ({y})")).unwrap_or_default()
            } else {
                String::new()
            };
            ListItem::new(format!("{}{}{}{}", emoji, prefix, it.name, year))
        })
        .collect();
  
    let list = List::new(list_items)
        .block(
            Block::bordered()
                .title(format!("{title} [{}/{}]", items.len(), total))
                .merge_borders(MergeStrategy::Exact),
        )
        .highlight_symbol("> ")
        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));

    let mut state = ListState::default();
    state.select(if len > 0 { Some(selected - start) } else { None });

    frame.render_stateful_widget(list, left, &mut state);

    let detail = if len > 0 {
        let it = &items[selected];
        format_details(it)
    } else {
        "No items returned".to_string()
    };

    frame.render_widget(
        Paragraph::new(detail)
            .wrap(Wrap { trim: false })
            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
        right,
    );
}

fn open_children(app: &mut App, title: String, query: core::jellyfin::LibraryQuery) {
    let cfg = match &app.config {
        Some(c) => c.clone(),
        None => { app.status = "No config loaded".into(); return; }
    };
    let user_id = match cfg.user_id.as_deref() {
        Some(u) => u,
        None => { app.status = "Missing user_id in config (login again)".into(); return; }
    };
    let client = match core::jellyfin::JellyfinClient::from_config(&cfg) {
        Ok(c) => c,
        Err(e) => { app.status = e; return; }
    };

    app.status = format!("Fetching {}...", title);

    match client.list_items(user_id, query.clone(), 0, PAGE_SIZE) {
        Ok(page) => {
            app.view_stack.push(View::Library {
                title,
                query,
                items: page.items,
                selected: 0,
                start_index: 0,
                total: page.total,
                page_size: PAGE_SIZE,
                loading: false,
            });
            app.status = "$".into();
        }
        Err(e) => app.status = format!("Fetch failed: {e}"),
    }
}

fn mpv_socket_path() -> PathBuf {
    let mut p = std::env::temp_dir();
    let pid = std::process::id();
    p.push(format!("cj-jftui-mpv-{}.sock", pid));
    p
}

fn mpv_request(socket: &PathBuf, json_line: &str) -> Result<String, String> {
    let mut stream = UnixStream::connect(socket)
        .map_err(|e| format!("mpv ipc connect failed: {e}"))?;

    // Prevent UI hangs if mpv doesn't respond
    let _ = stream.set_write_timeout(Some(Duration::from_millis(40)));
    let _ = stream.set_read_timeout(Some(Duration::from_millis(40)));

    stream
        .write_all(json_line.as_bytes())
        .map_err(|e| format!("mpv ipc write failed: {e}"))?;

    let mut reader = BufReader::new(stream);
    let mut line = String::new();

    match reader.read_line(&mut line) {
        Ok(0) => Err("mpv ipc: EOF".to_string()),
        Ok(_) => Ok(line),
        Err(e) => {
            // timeout is normal; just treat it as "no data yet"
            if e.kind() == io::ErrorKind::WouldBlock || e.kind() == io::ErrorKind::TimedOut {
                Err("mpv ipc timeout".to_string())
            } else {
                Err(format!("mpv ipc read failed: {e}"))
            }
        }
    }
}

fn mpv_get_bool(mpv: &MpvSession, prop: &str) -> Result<bool, String> {
    let resp = mpv_request(
        &mpv.socket_path,
        &format!(r#"{{"command":["get_property","{}"]}}\n"#, prop),
    )?;

    let v: Value = serde_json::from_str(resp.trim())
        .map_err(|e| format!("mpv json parse failed: {e} ({})", resp.trim()))?;

    if v.get("error").and_then(|e| e.as_str()) != Some("success") {
        return Err(format!("mpv get_property failed: {}", resp.trim()));
    }

    Ok(v.get("data").and_then(|d| d.as_bool()).unwrap_or(false))
}

fn mpv_get_f64(mpv: &MpvSession, prop: &str) -> Result<Option<f64>, String> {
    let resp = mpv_request(
        &mpv.socket_path,
        &format!(r#"{{"command":["get_property","{}"]}}\n"#, prop),
    )?;

    let v: Value = serde_json::from_str(resp.trim())
        .map_err(|e| format!("mpv json parse failed: {e} ({})", resp.trim()))?;

    if v.get("error").and_then(|e| e.as_str()) != Some("success") {
        return Err(format!("mpv get_property failed: {}", resp.trim()));
    }

    Ok(v.get("data").and_then(|d| d.as_f64()))
}

fn mpv_send(socket: &PathBuf, json_line: &str) -> Result<(), String> {
    let mut stream = UnixStream::connect(socket)
        .map_err(|e| format!("mpv ipc connect failed: {e}"))?;
    stream
        .write_all(json_line.as_bytes())
        .map_err(|e| format!("mpv ipc write failed: {e}"))?;
    Ok(())
}

fn mpv_cmd(socket: &PathBuf, cmd: &str) -> Result<(), String> {
    // cmd should already be valid JSON without trailing newline
    mpv_send(socket, &format!("{cmd}\n"))
}

fn ticks_to_seconds(ticks: u64) -> f64 {
    // Jellyfin ticks are 10,000,000 per second
    (ticks as f64) / 10_000_000.0
}

fn mpv_seek_absolute(socket: &PathBuf, seconds: f64) -> Result<(), String> {
    // Wait until mpv has loaded something real (duration becomes available),
    // then issue a seek and REQUIRE a success reply.
    let seek_cmd = format!(r#"{{"command":["seek",{}, "absolute"]}}"#, seconds);

    let start = Instant::now();
    while start.elapsed() < Duration::from_millis(2500) {
        // duration being Some is a good signal that the file is actually ready
        let dur = mpv_get_f64_jtui(socket, "duration", 1).ok().flatten();
        if dur.is_some() {
            // seek, but only accept success
            if mpv_cmd_reply(socket, &seek_cmd).is_ok() {
                return Ok(());
            }
        }

        thread::sleep(Duration::from_millis(50));
    }

    Err("mpv seek failed (mpv never became ready or rejected seek)".into())
}

fn spawn_mpv(cfg: &core::config::Config, first_item_id: &str) -> Result<MpvSession, String> {
    let token = cfg
        .access_token
        .as_deref()
        .ok_or_else(|| "Missing access_token (login again)".to_string())?;

    let base = cfg.base_url.trim_end_matches('/');
    let url = format!("{}/Items/{}/Download", base, first_item_id);

    let header = format!("X-Emby-Token: {}", token);
    let sock = mpv_socket_path();

    // If a stale socket exists, remove it.
    let _ = std::fs::remove_file(&sock);

    let mut child = Command::new("mpv")
        .arg(url)
        .arg("--force-window=yes")
        .arg("--keep-open=yes")
        .arg("--idle=yes")
        .arg(format!("--http-header-fields={header}"))
        .arg(format!("--input-ipc-server={}", sock.display()))
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .spawn()
        .map_err(|e| format!("Failed to spawn mpv: {e}"))?;

    // Wait briefly for IPC socket to appear
    let start = Instant::now();
    while start.elapsed() < Duration::from_millis(800) {
        if sock.exists() {
            return Ok(MpvSession {
                socket_path: sock,
                child,
            });
        }
        thread::sleep(Duration::from_millis(10));
    }

    // If socket never appeared, mpv probably died
    let _ = child.kill();
    Err("mpv IPC socket did not appear".to_string())
}

fn mpv_load_item(cfg: &core::config::Config, mpv: &MpvSession, item_id: &str) -> Result<(), String> {
    let base = cfg.base_url.trim_end_matches('/');
    let url = format!("{}/Items/{}/Download", base, item_id);

    // loadfile replace
    mpv_cmd(
        &mpv.socket_path,
        &format!(r#"{{"command":["loadfile","{}","replace"]}}"#, url),
    )
}

fn mpv_cycle_audio(mpv: &MpvSession) -> Result<(), String> {
    mpv_cmd(&mpv.socket_path, r#"{"command":["cycle","audio"]}"#)
}

fn mpv_cycle_subtitles(mpv: &MpvSession) -> Result<(), String> {
    mpv_cmd(&mpv.socket_path, r#"{"command":["cycle","sub"]}"#)
}

fn mpv_toggle_subs(mpv: &MpvSession) -> Result<(), String> {
    mpv_cmd(&mpv.socket_path, r#"{"command":["cycle","sub-visibility"]}"#)
}

fn mpv_stop(mpv: &mut MpvSession) {
    let _ = mpv_cmd(&mpv.socket_path, r#"{"command":["quit"]}"#);
    let _ = mpv.child.kill();
    let _ = std::fs::remove_file(&mpv.socket_path);
}

fn mpv_get_prop_jtui(socket: &PathBuf, prop: &str, request_id: u32) -> Result<Value, String> {
    let mut stream = UnixStream::connect(socket)
        .map_err(|e| format!("mpv ipc connect failed: {e}"))?;

    let _ = stream.set_write_timeout(Some(Duration::from_millis(250)));
    let _ = stream.set_read_timeout(Some(Duration::from_millis(250)));

    let cmd = format!(
        r#"{{"command":["get_property","{}"],"request_id":{}}}"#,
        prop, request_id
    );

    stream
        .write_all(format!("{cmd}\n").as_bytes())
        .map_err(|e| format!("mpv ipc write failed: {e}"))?;

    // IMPORTANT: read a whole JSON line (track-list can be >1024 bytes)
    let mut reader = BufReader::new(stream);
    let mut line = String::new();
    reader
        .read_line(&mut line)
        .map_err(|e| format!("mpv ipc read failed: {e}"))?;

    if line.trim().is_empty() {
        return Err("mpv ipc: empty response".into());
    }

    let v: Value = serde_json::from_str(line.trim())
        .map_err(|e| format!("mpv json parse failed: {e} ({})", line.trim()))?;

    if v.get("error").and_then(|e| e.as_str()) != Some("success") {
        return Err(format!("mpv get_property({prop}) failed: {v}"));
    }

    Ok(v.get("data").cloned().unwrap_or(Value::Null))
}

fn selected_tracks_from_track_list(track_list: &Value) -> (Option<String>, Option<String>) {
    let arr = match track_list.as_array() {
        Some(a) => a,
        None => return (None, None),
    };

    let mut audio: Option<String> = None;
    let mut subs: Option<String> = None;

    for t in arr {
        let ty = t.get("type").and_then(|x| x.as_str()).unwrap_or("");
        let selected = t.get("selected").and_then(|x| x.as_bool()).unwrap_or(false);

        if !selected {
            continue;
        }

        match ty {
            "audio" => audio = Some(track_label_from_entry(t, "Audio")),
            "sub" => subs = Some(track_label_from_entry(t, "Sub")),
            _ => {}
        }
    }

    (audio, subs)
}

fn mpv_get_f64_jtui(socket: &PathBuf, prop: &str, request_id: u32) -> Result<Option<f64>, String> {
    Ok(mpv_get_prop_jtui(socket, prop, request_id)?.as_f64())
}

fn mpv_get_bool_jtui(socket: &PathBuf, prop: &str, request_id: u32) -> Result<bool, String> {
    Ok(mpv_get_prop_jtui(socket, prop, request_id)?.as_bool().unwrap_or(false))
}

fn mpv_toggle_fullscreen(mpv: &MpvSession) -> Result<(), String> {
    // cycles fullscreen on/off
    mpv_cmd(&mpv.socket_path, r#"{"command":["cycle","fullscreen"]}"#)
    // alternatively:
    // mpv_cmd(&mpv.socket_path, r#"{"command":["set_property","fullscreen","yes"]}"#)
}

fn mpv_cycle_pause(mpv: &MpvSession) -> Result<(), String> {
    mpv_cmd(&mpv.socket_path, r#"{"command":["cycle","pause"]}"#)
}

fn autoplay_tick(app: &mut App) {
    if !app.autoplay {
        return;
    }

    // If user navigated away from the view where autoplay started, cancel it.
    if app.view_stack.len() != app.autoplay_view_depth {
        app.autoplay = false;
        app.autoplay_next_index = None;
        app.autoplay_eof_latched = false;
        app.autoplay_prev_time_pos = None;
        return;
    }

    // Snapshot latest mpv state from poller thread
    let st = app.mpv_state.clone();

    // Optional: live debug in status (toggle with 'D')
    if app.debug_mpv {
        app.status = fmt_mpv_state(&st);
    }

    // Track previous time to detect "snapped back to 0"
    if let Some(tp) = st.time_pos {
        if tp > 0.25 {
            app.autoplay_prev_time_pos = Some(tp);
        }
    }

    let near_end = match (st.time_pos, st.duration) {
        (Some(tp), Some(d)) if d.is_finite() && d > 1.0 => (d - tp) <= 0.50,
        _ => false,
    };

    let near_100 = match st.percent {
        Some(p) if p.is_finite() => p >= 99.8,
        _ => false,
    };

    let snapped_to_start_idle = match (st.idle, st.time_pos, app.autoplay_prev_time_pos) {
        (true, Some(tp), Some(prev)) if prev > 1.0 && tp < 0.10 => true,
        _ => false,
    };

    let finished = st.eof || near_end || near_100 || snapped_to_start_idle;

    // If not finished, clear latch so we can trigger when it *does* finish later.
    if !finished {
        app.autoplay_eof_latched = false;
        return;
    }

    // Only trigger once per finish event
    if app.autoplay_eof_latched {
        return;
    }
    app.autoplay_eof_latched = true;

    // Need mpv running to advance
    let mpv = match &app.mpv {
        Some(m) => m,
        None => return,
    };

    let next_i = match app.autoplay_next_index {
        Some(i) => i,
        None => {
            app.autoplay = false;
            app.status = "$".into();
            return;
        }
    };

    let (next_id, next_name, len) = match app.current_view() {
        View::Library { items, .. } if next_i < items.len() => (
            items[next_i].id.clone(),
            items[next_i].name.clone(),
            items.len(),
        ),
        _ => {
            app.autoplay = false;
            app.autoplay_next_index = None;
            app.status = "$".into();
            return;
        }
    };

    app.mpv_now_playing = Some(next_name);


    // Move selection highlight in UI
    if let Some(View::Library { selected, .. }) = app.view_stack.last_mut() {
        *selected = next_i;
    }

    app.autoplay_next_index = if next_i + 1 < len { Some(next_i + 1) } else { None };

    let cfg = match app.config.clone() {
        Some(c) => c,
        None => {
            app.autoplay = false;
            app.autoplay_next_index = None;
            app.status = "No config".into();
            return;
        }
    };

    // Load next item (prefer local if available)
    let url = if let Some(p) = crate::core::downloads::local_media_path_for_item_id(&next_id) {
        p.to_string_lossy().to_string()
    } else {
        build_jellyfin_play_url(&cfg, &next_id)
    };

    if let Err(e) = mpv_load_url(&cfg, mpv, &url) {
        app.autoplay = false;
        app.autoplay_next_index = None;
        app.status = format!("autoplay load failed: {e}");
        return;
    }

    // Ensure playback resumes
    let _ = mpv_set_pause(mpv, false);

    // Reset tracking for new file
    app.autoplay_prev_time_pos = None;

    if !app.debug_mpv {
        app.status = "$".into();
    }
}

fn mpv_set_pause(mpv: &MpvSession, paused: bool) -> Result<(), String> {
    // pause is a boolean property in mpv JSON IPC
    let v = if paused { "true" } else { "false" };
    mpv_cmd(
        &mpv.socket_path,
        &format!(r#"{{"command":["set_property","pause",{}]}}"#, v),
    )
}

fn fmt_mpv_state(st: &MpvState) -> String {
    let pct = match st.percent {
        Some(p) if p.is_finite() => p,
        _ => match (st.time_pos, st.duration) {
            (Some(t), Some(d)) if t.is_finite() && d.is_finite() && d > 0.0 => (t / d) * 100.0,
            _ => 0.0,
        },
    };

    format!("{pct:5.1}%")
}

fn start_mpv_poller(socket_path: PathBuf) -> mpsc::Receiver<MpvState> {
    let (tx, rx) = mpsc::channel::<MpvState>();

    std::thread::spawn(move || {
        let mut request_id: u32 = 1;

        loop {
            let mut st = MpvState::default();

            // jtui pattern: connect->write->read(1024)->parse->close (per property call)
            let tp = mpv_get_f64_jtui(&socket_path, "time-pos", request_id).ok().flatten();
            request_id = request_id.wrapping_add(1);

            let dur = mpv_get_f64_jtui(&socket_path, "duration", request_id).ok().flatten();
            request_id = request_id.wrapping_add(1);
            
            let percent_pos = mpv_get_f64_jtui(&socket_path, "percent-pos", request_id).ok().flatten();
            request_id = request_id.wrapping_add(1);

            let eof = mpv_get_bool_jtui(&socket_path, "eof-reached", request_id).unwrap_or(false);
            request_id = request_id.wrapping_add(1);

            let idle = mpv_get_bool_jtui(&socket_path, "idle-active", request_id).unwrap_or(false);
            request_id = request_id.wrapping_add(1);

            let aid = mpv_get_prop_jtui(&socket_path, "aid", request_id).ok().and_then(|v| v.as_i64());
            request_id = request_id.wrapping_add(1);

            let sid = mpv_get_prop_jtui(&socket_path, "sid", request_id).ok().and_then(|v| v.as_i64());
            request_id = request_id.wrapping_add(1);

            let track_list = mpv_get_prop_jtui(&socket_path, "track-list", request_id).ok();
            request_id = request_id.wrapping_add(1);

            let (audio, subs) = match track_list.as_ref() {
                Some(v) => selected_tracks_from_track_list(v),
                None => (None, None),
            };

            let media_title = mpv_get_prop_jtui(&socket_path, "media-title", request_id)
                .ok()
                .and_then(|v| v.as_str().map(|s| s.to_string()));
            request_id = request_id.wrapping_add(1);

            st.time_pos = tp;
            st.duration = dur;
            st.eof = eof;
            st.idle = idle;
            st.media_title = media_title;
            st.audio = audio;
            st.subs = subs;

            // compute percent yourself (jtui style)
            st.percent = percent_pos
                .filter(|p| p.is_finite())
                .or_else(|| match (tp, dur) {
                    (Some(t), Some(d)) if t.is_finite() && d.is_finite() && d > 0.0 => Some((t / d) * 100.0),
                    _ => None,
                });


            // Optional: populate last_err if we got nothing useful
            if st.time_pos.is_none() && st.duration.is_none() {
                st.last_err = Some("mpv poll: no time-pos/duration (check socket / mpv running)".into());
            }

            if tx.send(st).is_err() {
                break;
            }

            std::thread::sleep(Duration::from_millis(200));
        }
    });

    rx
}

fn spawn_mpv_url(cfg: &core::config::Config, url: &str) -> Result<MpvSession, String> {
    let token = cfg
        .access_token
        .as_deref()
        .ok_or_else(|| "Missing access_token (login again)".to_string())?;

    let header = format!("X-Emby-Token: {}", token);
    let sock = mpv_socket_path();

    let _ = std::fs::remove_file(&sock);

    let mut child = Command::new("mpv")
        .arg(url)
        .arg("--force-window=yes")
        .arg("--keep-open=yes")
        .arg("--idle=yes")
        .arg(format!("--http-header-fields={header}"))
        .arg(format!("--input-ipc-server={}", sock.display()))
        .stdout(Stdio::null())
        .stderr(Stdio::null())
        .spawn()
        .map_err(|e| format!("Failed to spawn mpv: {e}"))?;

    let start = Instant::now();
    while start.elapsed() < Duration::from_millis(800) {
        if sock.exists() {
            return Ok(MpvSession { socket_path: sock, child });
        }
        thread::sleep(Duration::from_millis(10));
    }

    let _ = child.kill();
    Err("mpv IPC socket did not appear".to_string())
}

fn mpv_load_url(cfg: &core::config::Config, mpv: &MpvSession, url: &str) -> Result<(), String> {
    // mpv already has the http header from spawn flags
    let _ = cfg; // keep signature symmetric; might be useful later
    mpv_cmd(
        &mpv.socket_path,
        &format!(r#"{{"command":["loadfile","{}","replace"]}}"#, url),
    )
}

fn track_label(title: Option<&str>, lang: Option<&str>, id: Option<i64>, kind: &str) -> String {
    let mut parts: Vec<String> = Vec::new();

    if let Some(t) = title.map(|s| s.trim()).filter(|s| !s.is_empty()) {
        parts.push(t.to_string());
    }
    if let Some(l) = lang.map(|s| s.trim()).filter(|s| !s.is_empty()) {
        parts.push(l.to_string());
    }

    if parts.is_empty() {
        if let Some(i) = id {
            return format!("{kind} {i}");
        }
        return "-".into();
    }

    parts.join(" • ")
}

fn track_label_from_entry(t: &serde_json::Value, kind: &str) -> String {
    let title = t.get("title").and_then(|x| x.as_str()).map(str::trim).filter(|s| !s.is_empty());
    let lang  = t.get("lang").and_then(|x| x.as_str()).map(str::trim).filter(|s| !s.is_empty());

    // audio extras are often useful (codec/channels)
    let codec = t.get("codec").and_then(|x| x.as_str()).map(str::trim).filter(|s| !s.is_empty());
    let ch    = t.get("channels").and_then(|x| x.as_str()).map(str::trim).filter(|s| !s.is_empty());

    let mut parts: Vec<String> = Vec::new();
    if let Some(v) = title { parts.push(v.to_string()); }
    if let Some(v) = lang  { parts.push(v.to_string()); }

    if kind == "Audio" {
        if let Some(v) = codec { parts.push(v.to_string()); }
        if let Some(v) = ch    { parts.push(v.to_string()); }
    }

    if parts.is_empty() { "-".into() } else { parts.join(" • ") }
}

fn tracks_from_ids(track_list: &serde_json::Value, aid: Option<i64>, sid: Option<i64>) -> (Option<String>, Option<String>) {
    let arr = match track_list.as_array() {
        Some(a) => a,
        None => return (None, None),
    };
    let mut audio: Option<String> = None;
    let mut subs: Option<String>  = None;

    for t in arr {
        let ty = t.get("type").and_then(|x| x.as_str()).unwrap_or("");
        let id = t.get("id").and_then(|x| x.as_i64());

        match (ty, id) {
            ("audio", Some(id)) if Some(id) == aid => {
                audio = Some(track_label_from_entry(t, "Audio"));
            }
            ("sub", Some(id)) if Some(id) == sid => {
                subs = Some(track_label_from_entry(t, "Sub"));
            }
            _ => {}
        }
    }

    (audio, subs)
}

fn fmt_hms(t: f64) -> String {
    if !t.is_finite() || t < 0.0 { return "--:--".into(); }
    let total = t as u64;
    let h = total / 3600;
    let m = (total % 3600) / 60;
    let s = total % 60;
    if h > 0 { format!("{h}:{m:02}:{s:02}") } else { format!("{m}:{s:02}") }
}

fn mpv_progress(st: &MpvState) -> (u16, String) {
    let pct = st.percent.unwrap_or(0.0).clamp(0.0, 100.0);
    let p_u16 = pct.round() as u16;

    let cur = st.time_pos.map(fmt_hms).unwrap_or("--:--".into());
    let dur = st.duration.map(fmt_hms).unwrap_or("--:--".into());
    (p_u16, format!("{cur} / {dur}  ({pct:0.1}%)"))
}

fn render_downloads_panel(frame: &mut Frame, app: &App, area: Rect) {
    let title = if app.downloads_focus {
        "Downloads (focus)"
    } else {
        "Downloads"
    };

    // rows available inside the border
    let viewport = area.height.saturating_sub(2) as usize;

    let mut rows: Vec<ListItem> = Vec::new();
    let mut state = ListState::default();

    // Helper: "basic" scrolling window (no centering)
    // Ensures selected is always visible within [start, start+viewport)
    fn basic_window(len: usize, selected: usize, viewport: usize) -> (usize, usize) {
        if len == 0 || viewport == 0 {
            return (0, 0);
        }
        let viewport = viewport.min(len);
        let mut start = 0usize;

        // If selected is below the visible window, scroll down just enough
        if selected >= start + viewport {
            start = selected + 1 - viewport;
        }
        // If selected is above the visible window, scroll up just enough
        if selected < start {
            start = selected;
        }

        // Clamp
        if start + viewport > len {
            start = len - viewport;
        }

        (start, start + viewport)
    }

    // Empty states
    if app.downloads.is_none() {
        rows.push(ListItem::new("(downloads disabled)"));
        state.select(None);

        let list = List::new(rows)
            .block(Block::bordered().title(title).merge_borders(MergeStrategy::Exact))
            .highlight_symbol(">> ")
            .highlight_style(Style::default().add_modifier(Modifier::REVERSED));

        frame.render_stateful_widget(list, area, &mut state);
        return;
    }

    let dm = app.downloads.as_ref().unwrap();

    match dm.state.lock() {
        Err(_) => {
            rows.push(ListItem::new("(downloads lock poisoned)"));
            state.select(None);
        }
        Ok(st) => {
            let len = st.queue.len();

            if len == 0 {
                rows.push(ListItem::new("(empty)"));
                state.select(None);
            } else {
                // Clamp selection
                let selected = app.downloads_selected.min(len.saturating_sub(1));

                // Basic scrolling window
                let (start, end) = basic_window(len, selected, viewport);

                for i in start..end {
                    let it = match st.queue.get(i) {
                        Some(v) => v,
                        None => continue,
                    };

                    let status = match &it.status {
                        DownloadStatus::Queued => "queued",
                        DownloadStatus::Downloading => "downloading",
                        DownloadStatus::Finalizing => "finalizing",
                        DownloadStatus::Completed => "done",
                        DownloadStatus::Cancelled => "cancelled",
                        DownloadStatus::Failed(_) => "failed",
                    };

                    let active_prefix = if i == 0 { "▶ " } else { "  " };

                    // Prefer aria2-derived info if you have it; otherwise it will show --% (--:--)
                    let prog_prefix = if matches!(it.status, DownloadStatus::Downloading) {
                        // uses the fields you now populate from aria2 RPC
                        // (bytes_downloaded, bytes_total, eta_secs)
                        let pct_str = match it.bytes_total {
                            Some(t) if t > 0 => {
                                let pct = (it.bytes_downloaded as f64 / t as f64) * 100.0;
                                format!("{:0.0}%", pct.clamp(0.0, 100.0))
                            }
                            _ => "--%".to_string(),
                        };

                        let eta_str = match it.eta_secs {
                            Some(s) => fmt_hms(s as f64),
                            None => "--:--".to_string(),
                        };

                        format!("{pct_str} ({eta_str}) ")
                    } else {
                        String::new()
                    };

                    rows.push(ListItem::new(format!(
                        "{active_prefix}{status}: {prog_prefix}{}",
                        it.title
                    )));
                }

                // selection must be relative to the window slice
                state.select(Some(selected - start));
            }
        }
    }

    let list = List::new(rows)
        .block(Block::bordered().title(title).merge_borders(MergeStrategy::Exact))
        .highlight_symbol(">> ")
        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));

    frame.render_stateful_widget(list, area, &mut state);
}

// Returns e.g. "56% (4:32) "
// If total is unknown, returns "--% (--:--) "
fn format_download_pct_eta(downloaded: u64, total: Option<u64>, added_at: Instant) -> String {
    // Percent
    let pct_str = match total {
        Some(t) if t > 0 => {
            let pct = (downloaded as f64 / t as f64) * 100.0;
            format!("{:0.0}%", pct.clamp(0.0, 100.0))
        }
        _ => "--%".to_string(),
    };

    // ETA from average speed since added_at (good enough for UI)
    let elapsed = added_at.elapsed().as_secs_f64();
    let speed = if elapsed > 0.0 {
        downloaded as f64 / elapsed
    } else {
        0.0
    };

    let eta_str = match (total, speed) {
        (Some(t), s) if t > downloaded && s > 1.0 => {
            let remaining = (t - downloaded) as f64;
            let eta_secs = remaining / s;
            fmt_hms(eta_secs)
        }
        _ => "--:--".to_string(),
    };

    format!("{pct_str} ({eta_str}) ")
}


fn render_mpv_panel(frame: &mut Frame, app: &App, area: Rect) {
    // Make the bar exactly 1 row and don't depend on bordered blocks.
    let [c0, c1, c2, c3, c4, c5] = Layout::vertical([
        Constraint::Length(1), // title (no border)
        Constraint::Length(1), // audio
        Constraint::Length(1), // subs
        Constraint::Length(1), // BAR (raw)
        Constraint::Length(1), // time
        Constraint::Min(1),    // controls
    ])
    .areas(area);

    let st = &app.mpv_state;

    let title = app
        .mpv_now_playing
        .clone()
        .or_else(|| st.media_title.clone())
        .unwrap_or_else(|| "-".into());

    let audio = st.audio.clone().unwrap_or_else(|| "-".into());
    let subs  = st.subs.clone().unwrap_or_else(|| "None".into());

    frame.render_widget(Paragraph::new(format!("▶ {title}")), c0);
    frame.render_widget(Paragraph::new(format!("Audio: {audio}")), c1);
    frame.render_widget(Paragraph::new(format!("Subs:  {subs}")), c2);

    let ratio = (st.percent.unwrap_or(0.0) / 100.0).clamp(0.0, 1.0);
    let pct = st.percent.unwrap_or(0.0);

    // reserve 1 col so we don't draw into the overlap w/ right pane border
    let safe_w = c3.width.saturating_sub(1);

    let bar_line = mpv_bar_line(safe_w, ratio, pct);
    frame.render_widget(Paragraph::new(bar_line), c3);

    let cur_secs = st.time_pos.unwrap_or(0.0);
    let dur_secs = st.duration.unwrap_or(0.0);

    let cur = st.time_pos.map(fmt_hms).unwrap_or("--:--".into());
    let dur = st.duration.map(fmt_hms).unwrap_or("--:--".into());

    let remaining = if dur_secs > 0.0 && cur_secs <= dur_secs {
        fmt_hms(dur_secs - cur_secs)
    } else {
        "--:--".into()
    };

    frame.render_widget(
        Paragraph::new(format!("{cur} / {dur}  ({remaining} remaining)")),
        c4,
    );

    let controls =
        "Space: pause  x: stop  f: fullscreen\na: audio  s: subs  v: sub vis";
    frame.render_widget(Paragraph::new(controls).wrap(Wrap { trim: true }), c5);
}

fn mpv_bar_line(width: u16, ratio: f64, pct: f64) -> String {
    let w = width as usize;
    if w == 0 {
        return String::new();
    }

    let prefix = "mpv ";
    let pct_text = format!("{:>5.1}%", pct.clamp(0.0, 100.0)); // " 43.3%"
    let pct_area_min = pct_text.len() + 2; // breathing room around percent

    // If too narrow, just show prefix+percent
    if w <= prefix.len() + pct_text.len() {
        return format!("{prefix}{pct_text}");
    }

    let avail = w - prefix.len();

    // Give pct a fixed-ish area if we can, but keep at least 2 cols for the bar: "[]"
    let pct_area = pct_area_min.min(avail.saturating_sub(2));
    let bar_w = (avail - pct_area).max(2);

    let bar = unicode_progress_bar(bar_w, ratio);

    // IMPORTANT: compute remaining space using bar_w (columns), not bar.len() (bytes)
    let pct_area_actual = avail.saturating_sub(bar_w);
    let mut pct_buf = vec![' '; pct_area_actual];

    if pct_area_actual >= pct_text.len() {
        let start = (pct_area_actual - pct_text.len()) / 2;
        for (i, ch) in pct_text.chars().enumerate() {
            pct_buf[start + i] = ch;
        }
    }

    let pct_field: String = pct_buf.into_iter().collect();
    format!("{prefix}{bar}{pct_field}")
}

fn unicode_progress_bar(width: usize, ratio: f64) -> String {
    // width includes the brackets: [ .... ]
    if width < 2 {
        return String::new();
    }

    let inner = width - 2;
    let ratio = ratio.clamp(0.0, 1.0);

    // 8-level partial blocks
    // 0..=7 maps to: (none), ▏▎▍▌▋▊▉
    const PARTS: [char; 8] = [' ', '▏', '▎', '▍', '▌', '▋', '▊', '▉'];

    let total_units = inner * 8;
    let filled_units = (ratio * total_units as f64).round() as usize;

    let full = filled_units / 8;
    let rem = filled_units % 8;

    let mut s = String::with_capacity(width);
    s.push('[');

    // full blocks
    let full = full.min(inner);
    s.push_str(&"█".repeat(full));

    // partial block (if any room left)
    if full < inner {
        if rem > 0 {
            s.push(PARTS[rem]);
        } else {
            s.push(' ');
        }

        // rest empty
        let used = full + 1;
        if used < inner {
            s.push_str(&" ".repeat(inner - used));
        }
    }

    s.push(']');
    s
}

fn is_music_item(it: &core::jellyfin::JfItem) -> bool {
    matches!(it.item_type.as_deref(), Some("Audio" | "MusicAlbum" | "MusicArtist"))
}

fn is_downloaded(app: &App, it: &core::jellyfin::JfItem) -> bool {
    // Basic: only exact item-id matches.
    // (No container inference for Series/Season/Album right now.)
    app.downloaded_ids.contains(&it.id)
}

fn is_played(it: &core::jellyfin::JfItem) -> bool {
    if it.user_data.as_ref().and_then(|u| u.played) == Some(true) {
        return true;
    }

    // Jellyfin often provides this for Season/Series
    if matches!(it.item_type.as_deref(), Some("Season" | "Series")) {
        if it.user_data.as_ref().and_then(|u| u.unplayed_item_count) == Some(0) {
            return true;
        }
    }

    if let Some(p) = it.user_data.as_ref().and_then(|u| u.played_percentage) {
        return p >= 99.9;
    }

    false
}

fn playback_position_ticks(it: &core::jellyfin::JfItem) -> Option<u64> {
    it.user_data
        .as_ref()
        .and_then(|u| u.playback_position_ticks)
        .and_then(|v| if v > 0 { Some(v as u64) } else { None })
}

fn is_in_progress_fast(it: &core::jellyfin::JfItem) -> bool {
    // Already fully played? Never in-progress.
    if is_played(it) {
        return false;
    }

    match it.item_type.as_deref() {
        // Movies / Episodes → resume ticks mean in-progress
        Some("Movie" | "Episode") => {
            playback_position_ticks(it).is_some()
        }

        // Seasons → jtui-style fast logic
        Some("Season") => {
            // 1) Prefer server percentage if present
            if let Some(p) = it.user_data
                .as_ref()
                .and_then(|u| u.played_percentage)
            {
                if p > 0.1 && p < 99.9 {
                    return true;
                }
            }

            // 2) Fallback to count-based detection:
            //    0 < UnplayedItemCount < ChildCount
            let total = it.child_count
                .and_then(|v| if v > 0 { Some(v as u64) } else { None });

            let unplayed = it.user_data
                .as_ref()
                .and_then(|u| u.unplayed_item_count)
                .and_then(|v| if v >= 0 { Some(v as u64) } else { None });

            match (total, unplayed) {
                (Some(t), Some(u)) if t > 0 && u > 0 && u < t => true,
                _ => false,
            }
        }

        // Series → complete or nothing (as you requested)
        Some("Series") => false,

        _ => false,
    }
}

fn emoji_prefix_for(app: &App, it: &core::jellyfin::JfItem) -> String {
    // Music: show only the local-download indicator (💾) and never show played/in-progress.
    // Everything else keeps the existing behavior (💾 + ✅/🟠).
    let downloaded = is_downloaded(app, it);

    if is_music_item(it) {
        return if downloaded { "💾 ".to_string() } else { String::new() };
    }

    let played = is_played(it);
    let inprog = is_in_progress_fast(it);

    let mut s = String::new();

    if downloaded {
        s.push_str("💾 ");
    }

    if played {
        s.push_str("✅ ");
    } else if inprog {
        s.push_str("🟠 ");
    }

    s
}

/*
fn is_in_progress(it: &core::jellyfin::JfItem) -> bool {
    if is_played(it) {
        return false;
    }

    match it.item_type.as_deref() {
        // Movies/Episodes: only if resume ticks exist
        Some("Movie" | "Episode") => playback_position_ticks(it).is_some(),

        // Seasons: percent-based
        Some("Season") => it.user_data
            .as_ref()
            .and_then(|u| u.played_percentage)
            .is_some_and(|p| p > 0.1 && p < 99.9),

        // Series: no in-progress marker (your requirement)
        Some("Series") => false,

        _ => false,
    }
}
*/

// --- transcoding + resume URL builder (Approach B) ---
fn clamp_mbps_to_bps(mbps: u32) -> u32 {
    mbps.saturating_mul(1_000_000) // Mb/s -> bits/s
}

fn build_jellyfin_play_url(cfg: &core::config::Config, item_id: &str) -> String {
    let base = cfg.base_url.trim_end_matches('/');
    format!("{}/Items/{}/Download", base, item_id)
}

fn mpv_cmd_reply(socket: &PathBuf, cmd: &str) -> Result<Value, String> {
    let mut stream = UnixStream::connect(socket)
        .map_err(|e| format!("mpv ipc connect failed: {e}"))?;

    let _ = stream.set_write_timeout(Some(Duration::from_millis(500)));
    let _ = stream.set_read_timeout(Some(Duration::from_millis(500)));

    stream
        .write_all(format!("{cmd}\n").as_bytes())
        .map_err(|e| format!("mpv ipc write failed: {e}"))?;

    let mut reader = BufReader::new(stream);
    let mut line = String::new();
    reader
        .read_line(&mut line)
        .map_err(|e| format!("mpv ipc read failed: {e}"))?;

    if line.trim().is_empty() {
        return Err("mpv ipc: empty response".into());
    }

    let v: Value = serde_json::from_str(line.trim())
        .map_err(|e| format!("mpv json parse failed: {e} ({})", line.trim()))?;

    if v.get("error").and_then(|e| e.as_str()) != Some("success") {
        return Err(format!("mpv command failed: {}", line.trim()));
    }

    Ok(v)
}

struct Panes {
    top: Rect,
    left_main: Rect,
    right_main: Rect,
    left_output: Rect,
    right_output: Rect,
}

fn layout(area: Rect) -> Panes {
    use Constraint::Fill;

    let [top, bottom] =
        Layout::vertical([Fill(1), Fill(12)]).areas(area);

    let [main_area, output_area] =
        Layout::vertical([Fill(9), Fill(3)])
            .spacing(Spacing::Overlap(1))
            .areas(bottom);

    let [left_main, right_main] =
        Layout::horizontal([Fill(1), Fill(1)])
            .spacing(Spacing::Overlap(1))
            .areas(main_area);

    let [left_output, right_output] =
        Layout::horizontal([Fill(7), Fill(2)])
            .spacing(Spacing::Overlap(1))
            .areas(output_area);

    Panes {
        top,
        left_main,
        right_main,
        left_output,
        right_output,
    }
}

fn render_login(frame: &mut Frame, app: &App, left: Rect, right: Rect) {
    let focus = match app.login_focus {
        LoginFocus::User => "username",
        LoginFocus::Pass => "password",
    };

    let masked = "*".repeat(app.login_pass.len());

    let left_text = format!(
        "Login (Tab switch, Enter submit)\n\nusername: {}\npassword: {}\n\nfocus: {}\n",
        app.login_user, masked, focus
    );

    frame.render_widget(
        Paragraph::new(left_text)
            .block(Block::bordered().title("Login").merge_borders(MergeStrategy::Exact)),
        left,
    );

    let right_text = match &app.login_error {
        Some(e) => format!("Error:\n{e}"),
        None => "Enter Jellyfin credentials.\nToken will be stored in config.toml.".to_string(),
    };

    frame.render_widget(
        Paragraph::new(right_text)
            .block(Block::bordered().title("Info").merge_borders(MergeStrategy::Exact)),
        right,
    );
}

fn render_offline_library(
    frame: &mut Frame,
    title: &str,
    items: &[core::downloads::LocalEntry],
    selected: usize,
    left: Rect,
    right: Rect,
) {
    let viewport = left.height.saturating_sub(2) as usize;
    let len = items.len();
    let selected = selected.min(len.saturating_sub(1));

    let (start, end) = compute_window(len, selected, viewport);

    let list_items: Vec<ListItem> = items[start..end]
        .iter()
        .map(|it| ListItem::new(format!("💾 {}", it.title)))
        .collect();

    let list = List::new(list_items)
        .block(
            Block::bordered()
                .title(format!("{title} [{}/{}]", items.len(), items.len()))
                .merge_borders(MergeStrategy::Exact),
        )
        .highlight_symbol("> ")
        .highlight_style(Style::default().add_modifier(Modifier::REVERSED));

    let mut state = ListState::default();
    state.select(if len > 0 { Some(selected - start) } else { None });

    frame.render_stateful_widget(list, left, &mut state);

    let detail = if len > 0 {
        let it = &items[selected];
        format!("Title: {}\nItemId: {}\nPath:\n{}", it.title, it.item_id, it.path.display())
    } else {
        "No downloaded items found".to_string()
    };

    frame.render_widget(
        Paragraph::new(detail)
            .wrap(Wrap { trim: false })
            .block(Block::bordered().title("Details").merge_borders(MergeStrategy::Exact)),
        right,
    );
}

fn categories_for_mode(offline: bool) -> Vec<String> {
    if offline {
        vec![
            "Downloaded".into(),
            "Settings".into(),
        ]
    } else {
        vec![
            "Shows".into(),
            "Movies".into(),
            "Music".into(),
            "Playlists".into(),
            "Collections".into(),
            "Libraries".into(),
            "Continue Watching".into(),
            "Recently Added".into(),
            "Settings".into(),
        ]
    }
}