/*
    Movie App - Common Configuration
    If the app folder is renamed, update APP_NAME below and all paths
    will automatically adjust everywhere this file is included via requirepkg().
*/

// ── App identity ─────────────────────────────────────────────────────────────
var APP_NAME      = "Movie";
var BACKEND_PATH  = APP_NAME + "/backend/";

// ── Server API endpoints (relative from any page in this app) ────────────────
var MEDIA_API     = "../media";               // ?file=<vpath>  streams a file
var TRANSCODE_API  = "../media/transcode";            // ?file
var HLS_API        = "../media/hls";                  // ?file  same transcode, as an HLS playlist
var STORYBOARD_API = "../media/storyboard/";          // ?file[&image=1]  scrub previews
var SUBTITLE_API   = "../media/subtitles/";           // ?file[&track=n|&font=n]  embedded tracks
var AGI_INTERFACE = "../system/ajgi/interface?script=";

// ── Script paths (used when calling ao_module_agirun from the frontend) ──────
var SCRIPT_GET_LIBRARY       = BACKEND_PATH + "getLibrary.js";
var SCRIPT_GET_LIBRARY_CACHE = BACKEND_PATH + "getLibraryCache.js";
var SCRIPT_GET_EPISODES  = BACKEND_PATH + "getEpisodes.js";
var SCRIPT_GET_THUMBNAIL = BACKEND_PATH + "getThumbnail.js";
var SCRIPT_LIST_FOLDER   = BACKEND_PATH + "listFolder.js";
var SCRIPT_GET_MOVIE_INFO     = BACKEND_PATH + "getMovieInfo.js";
var SCRIPT_DISABLE_MOVIE_INFO = BACKEND_PATH + "disableMovieInfo.js";
var SCRIPT_GET_WATCHTIME      = BACKEND_PATH + "getWatchTime.js";
var SCRIPT_SET_WATCHTIME      = BACKEND_PATH + "setWatchTime.js";
var SCRIPT_GET_INDEX_STATS    = BACKEND_PATH + "getIndexStats.js";
var SCRIPT_CLEAR_INDEX        = BACKEND_PATH + "clearIndex.js";

// ── Streaming mode ───────────────────────────────────────────────────────────
// Formats the browser cannot decode are transcoded on the fly, and there are
// two ways to deliver that transcode:
//
//   mp4  a single fragmented MP4 streamed down one response. The long-standing
//        default: it starts fastest and costs the server nothing but the ffmpeg
//        process. It cannot answer byte-range requests, which WebKit clients
//        (Safari, and every browser on iOS) require before they will play
//        anything, so on those it fails outright.
//   hls  the same transcode cut into segments behind a playlist. Every segment
//        is a finite, seekable file, so WebKit plays it and seeking inside the
//        transcoded window no longer restarts the stream.
//
// "auto" picks hls on WebKit and mp4 everywhere else, so nothing changes for
// browsers that were already working.
var STREAM_MODE_KEY = "movie_stream_mode";

function isWebKitClient() {
    var ua = navigator.userAgent;
    // On iOS every browser is WebKit underneath, whatever it calls itself.
    if (/CriOS|FxiOS/.test(ua)) { return true; }
    // Chrome, Edge and Opera all carry "Safari" in their desktop UA.
    if (/Chrome\/|Chromium|Edg\/|OPR\/|Firefox\//.test(ua)) { return false; }
    return /Safari/.test(ua);
}

function getStreamMode() {
    var mode = localStorage.getItem(STREAM_MODE_KEY);
    return (mode === "mp4" || mode === "hls") ? mode : "auto";
}

function setStreamMode(mode) {
    if (mode !== "mp4" && mode !== "hls") { mode = "auto"; }
    localStorage.setItem(STREAM_MODE_KEY, mode);
}

// Whether the current preference resolves to HLS for this browser.
function usingHLS() {
    var mode = getStreamMode();
    if (mode === "hls") { return true; }
    if (mode === "mp4") { return false; }
    return isWebKitClient();
}

// WebKit plays HLS natively; everyone else needs hls.js, which is only present
// if it has been vendored into web/script/.
function nativeHLSSupported(videoEl) {
    if (!videoEl || !videoEl.canPlayType) { return false; }
    return videoEl.canPlayType("application/vnd.apple.mpegurl") !== "";
}

function hlsPlaybackSupported(videoEl) {
    if (nativeHLSSupported(videoEl)) { return true; }
    return !!(window.Hls && window.Hls.isSupported());
}

// Build the streaming URL for a transcoded file, honouring the current mode.
// startSeconds restarts the transcode at an offset; the resulting stream always
// begins at zero, so callers track the offset separately.
function transcodeStreamURL(filepath, startSeconds) {
    var base = usingHLS() ? HLS_API : TRANSCODE_API;
    var url  = base + "?file=" + encodeURIComponent(filepath);
    if (startSeconds && startSeconds > 0.001) {
        url += "&start=" + startSeconds.toFixed(3);
    }
    return url;
}

// Point a <video> at a stream URL. HLS on a browser without native support is
// routed through hls.js when it is available. Returns false when the stream
// cannot be played at all, so the caller can say so rather than hang.
function attachTranscodeStream(videoEl, url) {
    if (videoEl._hlsInstance) {
        // Tear down the previous hls.js attachment before rebinding
        try { videoEl._hlsInstance.destroy(); } catch (e) {}
        videoEl._hlsInstance = null;
    }

    var isPlaylist = url.indexOf(HLS_API) === 0;
    if (isPlaylist && !nativeHLSSupported(videoEl)) {
        if (!(window.Hls && window.Hls.isSupported())) { return false; }
        var hls = new window.Hls({ enableWorker: true });
        videoEl._hlsInstance = hls;
        hls.loadSource(url);
        hls.attachMedia(videoEl);
        return true;
    }

    videoEl.src = url;
    videoEl.load();
    return true;
}

// ── Scanner settings ─────────────────────────────────────────────────────────
var VALID_VIDEO_FORMATS = ["mp4", "webm", "ogg", "mkv", "avi", "mov", "m4v", "wmv", "flv", "rmvb", "ts"];
var SKIP_ROOT_PREFIXES  = ["tmp:/", "trash:/"];    // roots to skip entirely
var VIDEO_FOLDER_NAME   = "Video";                 // expected folder inside each root
var MOVIE_FOLDER_NAMES  = ["movie", "movies"];     // folder names (case-insensitive) treated as movie containers
var ANIME_FOLDER_NAMES  = ["anime"];               // folder names (case-insensitive) treated as anime containers