window.App = window.App || {};
App.player = App.player || {};

(function() {
    const state = App.state;

    // Playback heuristics for full-screen behavior on mobile/TV browsers.
    function isMobilePlayback() {
        if (navigator.userAgentData && typeof navigator.userAgentData.mobile === 'boolean') {
            return navigator.userAgentData.mobile;
        }
        const ua = navigator.userAgent || '';
        if (/iPhone|iPad|iPod|Android/i.test(ua)) return true;
        return window.matchMedia('(pointer: coarse)').matches && window.matchMedia('(max-width: 900px)').matches;
    }

    function isTvPlayback() {
        const ua = navigator.userAgent || '';
        return /SMART-TV|SmartTV|Smart TV|Internet\.TV|HbbTV|NetCast|Web0S|webOS|Tizen|AppleTV|Apple TV|GoogleTV|Android TV|AFTB|AFTS|AFTM|AFTT|AFTQ|AFTK|AFTN|AFTMM|AFTKR|Roku|DTV|BRAVIA|VIZIO|SHIELD|PhilipsTV|Hisense|VIDAA|TOSHIBA/i.test(ua);
    }

    function getMobileVideoHost() {
        let host = document.getElementById('mobile-video-host');
        if (!host) {
            host = document.createElement('div');
            host.id = 'mobile-video-host';
            document.body.appendChild(host);
        }
        return host;
    }

    App.player.open = async function(source, opts) {
        const modal = document.getElementById('video-modal');
        const video = document.getElementById('player');
        const originEl = opts && opts.originEl ? opts.originEl : null;
        const clearLoading = () => {
            if (originEl) {
                originEl.classList.remove('is-loading');
            }
        };
        if (originEl) {
            originEl.classList.add('is-loading');
        }
        if (!modal || !video) {
            clearLoading();
            return;
        }
        const useMobileFullscreen = isMobilePlayback() || isTvPlayback();

        if (!state.playerHome) {
            state.playerHome = video.parentElement;
        }

        // Resolve an ordered list of candidate sources (best first). When a
        // source's URL fails to load we fall back to the next one.
        let sources = [];
        if (App.videos && typeof App.videos.resolveStreamSources === 'function') {
            sources = App.videos.resolveStreamSources(source);
        } else {
            let resolved = { url: '', referer: '' };
            if (App.videos && typeof App.videos.resolveStreamSource === 'function') {
                resolved = App.videos.resolveStreamSource(source);
            } else if (typeof source === 'string') {
                resolved.url = source;
            } else if (source && typeof source === 'object') {
                resolved.url = source.url || '';
            }
            if (resolved.url) sources = [resolved];
        }
        if (!sources.length) {
            if (App.ui && App.ui.showError) {
                App.ui.showError('Unable to play this stream.');
            }
            clearLoading();
            return;
        }

        // Expand the candidate sources into an ordered playback plan. When a
        // source has been proven (in the background) to play directly, try the
        // raw upstream URL first and keep the proxy as the immediate fallback;
        // unproven sources go straight through the proxy.
        const directProven = (url) => !!(App.videos && App.videos.isDirectProven && App.videos.isDirectProven(url));
        const playbackPlan = [];
        sources.forEach((resolved) => {
            if (directProven(resolved.url)) {
                playbackPlan.push({ resolved, direct: true });
            }
            playbackPlan.push({ resolved, direct: false });
        });

        if (useMobileFullscreen) {
            const host = getMobileVideoHost();
            if (video.parentElement !== host) {
                host.appendChild(video);
            }
            state.playerMode = 'mobile';
            video.removeAttribute('playsinline');
            video.removeAttribute('webkit-playsinline');
            video.playsInline = false;
        } else {
            if (state.playerHome && video.parentElement !== state.playerHome) {
                state.playerHome.appendChild(video);
            }
            state.playerMode = 'modal';
            video.setAttribute('playsinline', '');
            video.setAttribute('webkit-playsinline', '');
            video.playsInline = true;
        }

        const requestFullscreen = () => {
            if (state.playerMode !== 'mobile') return;
            if (typeof video.webkitEnterFullscreen === 'function') {
                try {
                    video.webkitEnterFullscreen();
                } catch (err) {
                    // Ignore if fullscreen is not allowed.
                }
                return;
            }
            if (video.requestFullscreen) {
                video.requestFullscreen().catch(() => {});
            }
        };

        const failPlayback = (message) => {
            clearLoading();
            if (App.ui && App.ui.showError) {
                App.ui.showError(message);
            }
            App.player.close();
        };

        // Attempts to play a single source. On a fatal failure it advances to
        // the next candidate, or reports an error once the list is exhausted.
        const attempt = async (index) => {
            const entry = playbackPlan[index];
            const resolved = entry.resolved;
            const hasNext = index + 1 < playbackPlan.length;
            let playbackStarted = false;
            let settled = false;

            // Advances to the next source (or fails) exactly once per attempt,
            // guarding against overlapping error callbacks.
            const advanceOrFail = (message) => {
                if (settled) return;
                settled = true;
                if (hasNext) {
                    attempt(index + 1);
                } else {
                    failPlayback(message);
                }
            };

            // Proven-direct entries hit the upstream URL straight from the
            // browser; everything else is wrapped in the backend stream proxy.
            let streamUrl;
            if (entry.direct) {
                streamUrl = resolved.url;
            } else {
                streamUrl = App.videos.buildStreamUrlFromSource(resolved);
            }
            let isHls = /\.m3u8($|\?)/i.test(resolved.url);
            let isDirectMedia = /\.(mp4|m4v|m4s|webm|ts|mov)($|\?)/i.test(resolved.url);
            // Live cam streams resolve (server-side) to HLS; treat them as HLS up
            // front so we skip the content-type HEAD probe and go straight to it.
            if (resolved.isLive) {
                isHls = true;
                isDirectMedia = false;
            }

            // Drop the previous attempt's error handler and player instance
            // before rebinding so stale callbacks don't double-advance.
            video.onerror = null;
            if (state.hlsPlayer) {
                state.hlsPlayer.stopLoad();
                state.hlsPlayer.detachMedia();
                state.hlsPlayer.destroy();
                state.hlsPlayer = null;
            }

            // Reset the video element before re-binding a new source.
            video.pause();
            video.removeAttribute('src');
            video.load();

            if (!isHls && !entry.direct) {
                try {
                    const headResp = await fetch(streamUrl, { method: 'HEAD' });
                    const contentType = headResp.headers.get('Content-Type') || '';
                    if (contentType.includes('application/vnd.apple.mpegurl')) {
                        isHls = true;
                    } else if (contentType.startsWith('video/') || contentType.startsWith('audio/')) {
                        isDirectMedia = true;
                    }
                } catch (err) {
                    console.warn('Failed to detect stream type', err);
                }
            }

            const startPlayback = () => {
                if (playbackStarted) return;
                playbackStarted = true;
                clearLoading();
                const playPromise = video.play();
                if (playPromise && typeof playPromise.catch === 'function') {
                    playPromise.catch(() => {});
                }
                if (state.playerMode === 'mobile') {
                    if (video.readyState >= 1) {
                        requestFullscreen();
                    } else {
                        video.addEventListener('loadedmetadata', requestFullscreen, { once: true });
                    }
                }
            };

            // Confirmed direct media (mp4/webm/…) never needs hls.js; everything
            // else might, so pull it in now that the type has been sniffed.
            if (!window.Hls && (isHls || !isDirectMedia)) {
                try {
                    await App.ensureHls();
                } catch (err) {
                    // Fall back to native playback below.
                }
            }

            const canUseHls = !!(window.Hls && window.Hls.isSupported());
            const prefersHls = isHls || (canUseHls && !isDirectMedia && !video.canPlayType('application/vnd.apple.mpegurl'));
            let hlsTried = false;
            let nativeTried = false;
            let usingHls = false;

            const startNative = () => {
                if (nativeTried) return;
                nativeTried = true;
                usingHls = false;
                video.src = streamUrl;
                startPlayback();
            };

            const startHls = (allowFallback) => {
                if (!canUseHls || hlsTried) return false;
                hlsTried = true;
                usingHls = true;
                state.hlsPlayer = new window.Hls();
                state.hlsPlayer.loadSource(streamUrl);
                state.hlsPlayer.attachMedia(video);
                state.hlsPlayer.on(window.Hls.Events.MANIFEST_PARSED, function() {
                    startPlayback();
                });
                startPlayback();
                state.hlsPlayer.on(window.Hls.Events.ERROR, function(event, data) {
                    if (data && data.fatal) {
                        const shouldFallback = allowFallback && !nativeTried && !isHls;
                        if (state.hlsPlayer) {
                            state.hlsPlayer.destroy();
                            state.hlsPlayer = null;
                        }
                        if (shouldFallback) {
                            startNative();
                            return;
                        }
                        advanceOrFail('Unable to play this stream.');
                    }
                });
                return true;
            };

            if (prefersHls) {
                if (!startHls(true)) {
                    if (video.canPlayType('application/vnd.apple.mpegurl')) {
                        startNative();
                    } else if (hasNext) {
                        advanceOrFail('HLS is not supported in this browser.');
                        return;
                    } else {
                        console.error("HLS not supported in this browser.");
                        failPlayback('HLS is not supported in this browser.');
                        return;
                    }
                }
            } else {
                startNative();
            }

            video.onerror = () => {
                if (!usingHls && canUseHls && !hlsTried && !isDirectMedia) {
                    if (startHls(true)) return;
                }
                advanceOrFail('Video failed to load.');
            };
        };

        attempt(0);

        if (state.playerMode === 'modal') {
            // Ambient backdrop: a blurred copy of the poster fills the letterbox
            // behind the contained video for a richer, less sterile player.
            const modalContent = modal.querySelector('.modal-content');
            if (modalContent) {
                let poster = (source && (source.thumb || (source.meta && (source.meta.thumbnail || source.meta.thumb)))) || '';
                if (!poster && originEl) {
                    const img = originEl.querySelector('img');
                    if (img) poster = img.currentSrc || img.src || '';
                }
                if (poster) modalContent.style.setProperty('--poster', `url("${poster.replace(/"/g, '%22')}")`);
                else modalContent.style.removeProperty('--poster');
            }
            const reveal = () => { modal.style.display = 'flex'; };
            const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
            if (!reduce && document.startViewTransition) {
                document.startViewTransition(reveal);
            } else {
                reveal();
            }
            document.body.style.overflow = 'hidden';
        } else {
            modal.style.display = 'none';
            document.body.style.overflow = 'auto';
            if (!state.onFullscreenChange) {
                state.onFullscreenChange = () => {
                    if (state.playerMode === 'mobile' && !document.fullscreenElement) {
                        App.player.close();
                    }
                };
            }
            document.addEventListener('fullscreenchange', state.onFullscreenChange);
            if (!state.onWebkitEndFullscreen) {
                state.onWebkitEndFullscreen = () => {
                    if (state.playerMode === 'mobile') {
                        App.player.close();
                    }
                };
            }
            video.addEventListener('webkitendfullscreen', state.onWebkitEndFullscreen);
        }
    };

    App.player.close = function() {
        const modal = document.getElementById('video-modal');
        const video = document.getElementById('player');
        if (!modal || !video) return;

        if (state.hlsPlayer) {
            state.hlsPlayer.destroy();
            state.hlsPlayer = null;
        }
        if (document.fullscreenElement && document.exitFullscreen) {
            document.exitFullscreen().catch(() => {});
        }
        if (state.onFullscreenChange) {
            document.removeEventListener('fullscreenchange', state.onFullscreenChange);
        }
        if (state.onWebkitEndFullscreen) {
            video.removeEventListener('webkitendfullscreen', state.onWebkitEndFullscreen);
        }
        video.onerror = null;
        video.pause();
        video.src = '';
        modal.style.display = 'none';
        document.body.style.overflow = 'auto';
        if (state.playerHome && video.parentElement !== state.playerHome) {
            state.playerHome.appendChild(video);
        }
        state.playerMode = 'modal';
    };
})();