/**
 * VideoKonverter TV - Video-Player
 * Fullscreen-Player mit Tastatur/Fernbedienung-Steuerung
 * Speichert Watch-Progress automatisch
 */

let videoEl = null;
let videoId = 0;
let videoDuration = 0;
let progressBar = null;
let timeDisplay = null;
let playBtn = null;
let controlsTimer = null;
let saveTimer = null;
let controlsVisible = true;

/**
 * Player initialisieren
 * @param {number} id - Video-ID
 * @param {number} startPos - Startposition in Sekunden
 * @param {number} duration - Video-Dauer in Sekunden (Fallback)
 */
function initPlayer(id, startPos, duration) {
    videoId = id;
    videoDuration = duration;

    videoEl = document.getElementById("player-video");
    progressBar = document.getElementById("player-progress-bar");
    timeDisplay = document.getElementById("player-time");
    playBtn = document.getElementById("btn-play");

    if (!videoEl) return;

    // Stream-URL setzen (ffmpeg-Transcoding Endpoint)
    const streamUrl = `/api/library/videos/${id}/stream` +
        (startPos > 0 ? `?t=${Math.floor(startPos)}` : "");
    videoEl.src = streamUrl;

    // Events
    videoEl.addEventListener("timeupdate", onTimeUpdate);
    videoEl.addEventListener("play", onPlay);
    videoEl.addEventListener("pause", onPause);
    videoEl.addEventListener("ended", onEnded);
    videoEl.addEventListener("loadedmetadata", () => {
        if (videoEl.duration && isFinite(videoEl.duration)) {
            videoDuration = videoEl.duration;
        }
    });

    // Klick auf Video -> Play/Pause
    videoEl.addEventListener("click", togglePlay);

    // Controls UI
    playBtn.addEventListener("click", togglePlay);
    document.getElementById("btn-fullscreen").addEventListener("click", toggleFullscreen);

    // Progress-Bar klickbar fuer Seeking
    document.getElementById("player-progress").addEventListener("click", onProgressClick);

    // Tastatur-Steuerung
    document.addEventListener("keydown", onKeyDown);

    // Maus/Touch-Bewegung -> Controls anzeigen
    document.addEventListener("mousemove", showControls);
    document.addEventListener("touchstart", showControls);

    // Controls nach 4 Sekunden ausblenden
    scheduleHideControls();

    // Watch-Progress alle 10 Sekunden speichern
    saveTimer = setInterval(saveProgress, 10000);
}

// === Playback-Controls ===

function togglePlay() {
    if (!videoEl) return;
    if (videoEl.paused) {
        videoEl.play();
    } else {
        videoEl.pause();
    }
}

function onPlay() {
    if (playBtn) playBtn.innerHTML = "❚❚"; // Pause-Symbol
    scheduleHideControls();
}

function onPause() {
    if (playBtn) playBtn.innerHTML = "▶"; // Play-Symbol
    showControls();
    // Sofort speichern bei Pause
    saveProgress();
}

function onEnded() {
    // Video fertig -> als "completed" speichern
    saveProgress(true);
    // Zurueck navigieren nach 2 Sekunden
    setTimeout(() => {
        window.history.back();
    }, 2000);
}

// === Seeking ===

function seekRelative(seconds) {
    if (!videoEl) return;
    const newTime = Math.max(0, Math.min(
        videoEl.currentTime + seconds,
        videoEl.duration || videoDuration
    ));
    // Neue Stream-URL mit Zeitstempel
    const wasPlaying = !videoEl.paused;
    videoEl.src = `/api/library/videos/${videoId}/stream?t=${Math.floor(newTime)}`;
    if (wasPlaying) videoEl.play();
    showControls();
}

function onProgressClick(e) {
    if (!videoEl) return;
    const rect = e.currentTarget.getBoundingClientRect();
    const pct = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width));
    const dur = videoEl.duration || videoDuration;
    if (!dur) return;
    const newTime = pct * dur;
    // Neue Stream-URL mit Zeitstempel
    const wasPlaying = !videoEl.paused;
    videoEl.src = `/api/library/videos/${videoId}/stream?t=${Math.floor(newTime)}`;
    if (wasPlaying) videoEl.play();
    showControls();
}

// === Zeit-Anzeige und Progress ===

function onTimeUpdate() {
    if (!videoEl) return;
    const current = videoEl.currentTime;
    const dur = videoEl.duration || videoDuration;

    // Progress-Bar
    if (progressBar && dur > 0) {
        progressBar.style.width = ((current / dur) * 100) + "%";
    }

    // Zeit-Anzeige
    if (timeDisplay) {
        timeDisplay.textContent = formatTime(current) + " / " + formatTime(dur);
    }
}

function formatTime(sec) {
    if (!sec || !isFinite(sec)) return "0:00";
    const h = Math.floor(sec / 3600);
    const m = Math.floor((sec % 3600) / 60);
    const s = Math.floor(sec % 60);
    if (h > 0) {
        return h + ":" + String(m).padStart(2, "0") + ":" + String(s).padStart(2, "0");
    }
    return m + ":" + String(s).padStart(2, "0");
}

// === Controls Ein-/Ausblenden ===

function showControls() {
    const wrapper = document.getElementById("player-wrapper");
    if (wrapper) wrapper.classList.remove("player-hide-controls");
    controlsVisible = true;
    scheduleHideControls();
}

function hideControls() {
    if (!videoEl || videoEl.paused) return;
    const wrapper = document.getElementById("player-wrapper");
    if (wrapper) wrapper.classList.add("player-hide-controls");
    controlsVisible = false;
}

function scheduleHideControls() {
    if (controlsTimer) clearTimeout(controlsTimer);
    controlsTimer = setTimeout(hideControls, 4000);
}

// === Fullscreen ===

function toggleFullscreen() {
    const wrapper = document.getElementById("player-wrapper");
    if (!document.fullscreenElement) {
        (wrapper || document.documentElement).requestFullscreen().catch(() => {});
    } else {
        document.exitFullscreen().catch(() => {});
    }
}

// === Tastatur-Steuerung ===

function onKeyDown(e) {
    // Samsung Tizen Remote Keys
    const keyMap = {
        10009: "Escape",
        10182: "Escape",
        415: "Play",
        19: "Pause",
        413: "Stop",
        417: "FastForward",
        412: "Rewind",
    };
    const key = keyMap[e.keyCode] || e.key;

    switch (key) {
        case " ":
        case "Enter":
        case "Play":
        case "Pause":
            togglePlay();
            e.preventDefault();
            break;
        case "ArrowLeft":
        case "Rewind":
            seekRelative(-10);
            e.preventDefault();
            break;
        case "ArrowRight":
        case "FastForward":
            seekRelative(10);
            e.preventDefault();
            break;
        case "ArrowUp":
            // Lautstaerke hoch (falls vom Browser unterstuetzt)
            if (videoEl) videoEl.volume = Math.min(1, videoEl.volume + 0.1);
            showControls();
            e.preventDefault();
            break;
        case "ArrowDown":
            // Lautstaerke runter
            if (videoEl) videoEl.volume = Math.max(0, videoEl.volume - 0.1);
            showControls();
            e.preventDefault();
            break;
        case "Escape":
        case "Backspace":
        case "Stop":
            // Zurueck navigieren
            saveProgress();
            setTimeout(() => window.history.back(), 100);
            e.preventDefault();
            break;
        case "f":
            toggleFullscreen();
            e.preventDefault();
            break;
    }
}

// === Watch-Progress speichern ===

function saveProgress(completed) {
    if (!videoId || !videoEl) return;
    const pos = videoEl.currentTime || 0;
    const dur = videoEl.duration || videoDuration || 0;
    if (pos < 5 && !completed) return; // Erst ab 5 Sekunden speichern

    fetch("/tv/api/watch-progress", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
            video_id: videoId,
            position_sec: pos,
            duration_sec: dur,
        }),
    }).catch(() => {}); // Fehler ignorieren (nicht kritisch)
}

// Beim Verlassen der Seite speichern
window.addEventListener("beforeunload", () => saveProgress());