<?php
/**
 * tv.php - M3U8 直播播放器
 * 通过 PHP 代理解决 CORS 问题
 */

// ==================== API 代理逻辑 ====================
if (isset($_GET['api'])) {
    header('Access-Control-Allow-Origin: *');
    header('Access-Control-Allow-Methods: GET, OPTIONS');
    header('Access-Control-Allow-Headers: Range, Accept-Encoding');
    
    if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
        http_response_code(200);
        exit;
    }
    
    $url = $_GET['url'] ?? '';
    if (empty($url)) {
        http_response_code(400);
        die('Missing URL');
    }
    
    // 验证 URL
    $parsed = parse_url($url);
    if (!$parsed || !in_array(strtolower($parsed['scheme'] ?? ''), ['http', 'https'])) {
        http_response_code(400);
        die('Invalid URL');
    }
    
    $isTS = ($_GET['api'] === 'ProxyTS');
    
    // TS 文件使用缓冲模式(更稳定)
    if ($isTS) {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_URL => $url,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 30,
            CURLOPT_CONNECTTIMEOUT => 3,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS => 3,
            CURLOPT_USERAGENT => 'Mozilla/5.0',
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        ]);
        
        // 处理 Range 请求
        $headers = ['Accept: */*'];
        if (isset($_SERVER['HTTP_RANGE'])) {
            $headers[] = 'Range: ' . $_SERVER['HTTP_RANGE'];
        }
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        
        $body = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
        $contentLength = curl_getinfo($ch, CURLINFO_CONTENT_LENGTH_DOWNLOAD);
        $error = curl_error($ch);
        curl_close($ch);
        
        if ($body === false || $httpCode >= 400) {
            http_response_code(502);
            header('Content-Type: text/plain');
            echo "Error: HTTP $httpCode";
            exit;
        }
        
        // 设置响应头
        header('Content-Type: ' . ($contentType ?: 'video/MP2T'));
        if ($contentLength > 0) {
            header('Content-Length: ' . $contentLength);
        }
        header('Cache-Control: public, max-age=7200');
        header('Accept-Ranges: bytes');
        
        echo $body;
        exit;
    }
    
    // M3U8 文件使用缓冲模式(需要重写内容)
    $ch = curl_init();
    curl_setopt_array($ch, [
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 15,
        CURLOPT_CONNECTTIMEOUT => 5,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => false,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_MAXREDIRS => 5,
        CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
        CURLOPT_ENCODING => '', // 支持压缩
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    ]);
    
    $headerContent = '';
    curl_setopt($ch, CURLOPT_HEADERFUNCTION, function($curl, $header) use (&$headerContent) {
        $headerContent .= $header;
        return strlen($header);
    });
    
    $body = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $effectiveUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
    $error = curl_error($ch);
    curl_close($ch);
    
    if ($body === false || $httpCode >= 400) {
        http_response_code(502);
        header('Content-Type: text/plain; charset=utf-8');
        echo "Proxy Error: HTTP $httpCode\n";
        echo "Error: " . ($error ?: 'Request failed') . "\n";
        exit;
    }
    
    // ProxyM3U8: 处理 M3U8 文件
    if ($_GET['api'] === 'ProxyM3U8') {
        $parsedUrl = parse_url($effectiveUrl);
        $baseUrl = ($parsedUrl['scheme'] ?? 'http') . '://' . ($parsedUrl['host'] ?? '');
        if (isset($parsedUrl['port'])) {
            $baseUrl .= ':' . $parsedUrl['port'];
        }
        $basePath = isset($parsedUrl['path']) ? dirname($parsedUrl['path']) : '/';
        $scriptPath = $_SERVER['SCRIPT_NAME'];
        
        // 重写 TS 链接为代理链接
        $body = preg_replace_callback(
            '/^(?!#)(.*?\.ts[^\r\n]*)/im',
            function($matches) use ($baseUrl, $basePath, $scriptPath) {
                $tsUrl = trim($matches[1]);
                
                // 如果已经是代理链接,不处理
                if (strpos($tsUrl, 'api=ProxyTS') !== false) {
                    return $tsUrl;
                }
                
                // 转换为绝对路径
                if (!preg_match('/^https?:\/\//i', $tsUrl)) {
                    if ($tsUrl[0] === '/') {
                        $tsUrl = $baseUrl . $tsUrl;
                    } else {
                        $tsUrl = $baseUrl . $basePath . '/' . $tsUrl;
                    }
                }
                
                return $scriptPath . '?api=ProxyTS&url=' . urlencode($tsUrl);
            },
            $body
        );
        
        header('Content-Type: application/vnd.apple.mpegurl');
        header('Cache-Control: no-cache');
        echo $body;
        exit;
    }
    
    // ProxyTS: 处理 TS 分片
    if ($_GET['api'] === 'ProxyTS') {
        // 转发 Content-Type
        if (preg_match('/Content-Type:\s*(.+?)\r?\n/i', $headerContent, $m)) {
            header('Content-Type: ' . trim($m[1]));
        } else {
            header('Content-Type: video/MP2T');
        }
        
        // 转发 Content-Length
        if (preg_match('/Content-Length:\s*(\d+)\r?\n/i', $headerContent, $m)) {
            header('Content-Length: ' . $m[1]);
        }
        
        // 转发 Range 相关头部
        if (preg_match('/Accept-Ranges:\s*(.+?)\r?\n/i', $headerContent, $m)) {
            header('Accept-Ranges: ' . trim($m[1]));
        }
        if (preg_match('/Content-Range:\s*(.+?)\r?\n/i', $headerContent, $m)) {
            header('Content-Range: ' . trim($m[1]));
        }
        
        header('Cache-Control: public, max-age=3600');
        echo $body;
        exit;
    }
    
    http_response_code(400);
    die('Invalid API type');
}

// ==================== 播放器界面 ====================
$defaultUrl = isset($_GET['url']) ? $_GET['url'] : 'http://tvgslb.hn.chinamobile.com:8089/180000001002/00000001000000000007000000001249/main.m3u8';
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>M3U8 播放器</title>
    <script src="https://cdn.jsdelivr.net/npm/hls.js@latest"></script>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            background: #1a1a1a;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }
        .container {
            max-width: 1000px;
            width: 100%;
            background: #2d2d2d;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }
        .video-box {
            background: #000;
            position: relative;
            width: 100%;
            aspect-ratio: 16/9;
        }
        video {
            width: 100%;
            height: 100%;
            display: block;
        }
        .controls {
            padding: 20px;
            background: #2d2d2d;
        }
        .status {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
            color: #ccc;
            font-size: 14px;
        }
        .dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #666;
        }
        .dot.active { background: #4CAF50; box-shadow: 0 0 8px #4CAF50; }
        .dot.loading { background: #FFC107; box-shadow: 0 0 8px #FFC107; }
        .dot.error { background: #f44336; box-shadow: 0 0 8px #f44336; }
        
        .input-group {
            display: flex;
            gap: 10px;
            margin-bottom: 15px;
        }
        input[type="text"] {
            flex: 1;
            padding: 12px 16px;
            background: #1a1a1a;
            border: 1px solid #444;
            border-radius: 6px;
            color: #fff;
            font-size: 14px;
            outline: none;
        }
        input[type="text"]:focus {
            border-color: #4CAF50;
        }
        button {
            padding: 12px 24px;
            background: #4CAF50;
            border: none;
            border-radius: 6px;
            color: white;
            font-size: 14px;
            cursor: pointer;
            transition: background 0.2s;
        }
        button:hover { background: #45a049; }
        button.secondary {
            background: #2196F3;
        }
        button.secondary:hover { background: #1976D2; }
        
        .presets {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }
        .preset-btn {
            padding: 8px 16px;
            background: #444;
            border: none;
            border-radius: 4px;
            color: #ccc;
            font-size: 12px;
            cursor: pointer;
        }
        .preset-btn:hover { background: #555; }
        
        .error-msg {
            margin-top: 10px;
            padding: 10px;
            background: rgba(244, 67, 54, 0.1);
            border-left: 3px solid #f44336;
            color: #ffcdd2;
            font-size: 13px;
            display: none;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="video-box">
        <video id="video" controls autoplay muted playsinline></video>
    </div>
    <div class="controls">
        <div class="status">
            <div class="dot" id="statusDot"></div>
            <span id="statusText">准备就绪</span>
        </div>
        
        <div class="input-group">
            <input type="text" id="urlInput" placeholder="输入 M3U8 地址..." value="<?= htmlspecialchars($defaultUrl) ?>">
            <button onclick="play()">播放</button>
        </div>
        
        <div class="presets">
            <button class="preset-btn" onclick="loadPreset('<?= htmlspecialchars($defaultUrl) ?>')">默认流</button>
            <button class="preset-btn" onclick="loadPreset('https://test-streams.mux.dev/x36xhzz/x36xhzz.m3u8')">测试流1</button>
            <button class="preset-btn" onclick="loadPreset('https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8')">测试流2</button>
        </div>
        
        <div class="error-msg" id="errorMsg"></div>
    </div>
</div>

<script>
const video = document.getElementById('video');
const urlInput = document.getElementById('urlInput');
const statusDot = document.getElementById('statusDot');
const statusText = document.getElementById('statusText');
const errorMsg = document.getElementById('errorMsg');

let hls = null;

function setStatus(state, text) {
    statusDot.className = 'dot ' + state;
    statusText.textContent = text;
}

function showError(msg) {
    errorMsg.textContent = msg;
    errorMsg.style.display = 'block';
    setStatus('error', '错误');
    console.error(msg);
}

function hideError() {
    errorMsg.style.display = 'none';
}

function destroyPlayer() {
    if (hls) {
        hls.destroy();
        hls = null;
    }
    video.pause();
    video.removeAttribute('src');
    video.load();
}

function play(url) {
    const streamUrl = url || urlInput.value.trim();
    if (!streamUrl) {
        showError('请输入 M3U8 地址');
        return;
    }
    
    hideError();
    destroyPlayer();
    setStatus('loading', '加载中...');
    
    const proxyUrl = window.location.pathname + '?api=ProxyM3U8&url=' + encodeURIComponent(streamUrl);
    
    // 使用 HLS.js
    if (Hls.isSupported()) {
        hls = new Hls({
            enableWorker: true,
            lowLatencyMode: false,
            maxBufferLength: 30,        // 增加到 30 秒,避免缓冲停滞
            maxMaxBufferLength: 60,     // 最大 60 秒
            maxBufferSize: 60 * 1000 * 1000, // 60MB
            maxBufferHole: 1.5,         // 增加容忍度
            startLevel: -1,
            manifestLoadingTimeOut: 10000,
            manifestLoadingMaxRetry: 3,
            levelLoadingTimeOut: 10000,
            levelLoadingMaxRetry: 3,
            fragLoadingTimeOut: 20000,
            fragLoadingMaxRetry: 5,     // 增加重试次数
            capLevelToPlayerSize: true,
            initialLiveManifestSize: 2, // 等待 2 个分片再播放
            liveSyncDurationCount: 5,   // 直播同步保持 5 个分片
            liveDurationInfinity: true,
            // 抗卡顿优化
            abrEwmaDefaultEstimate: 500000, // 默认带宽估计 500kbps
            abrBandWidthFactor: 0.95,
            abrBandWidthUpFactor: 0.7,
        });
        
        hls.on(Hls.Events.MEDIA_ATTACHED, () => {
            console.log('Media attached');
        });
        
        hls.on(Hls.Events.MANIFEST_PARSED, (event, data) => {
            console.log('Manifest parsed, levels:', data.levels.length);
            video.play().catch(e => {
                console.warn('Autoplay blocked:', e);
                setStatus('active', '点击播放');
            });
            setStatus('active', '播放中');
        });
        
        hls.on(Hls.Events.FRAG_LOADED, () => {
            hideError();
        });
        
        hls.on(Hls.Events.ERROR, (event, data) => {
            console.error('HLS Error:', data.type, data.details, data.fatal);
            
            if (data.fatal) {
                switch(data.type) {
                    case Hls.ErrorTypes.NETWORK_ERROR:
                        console.log('尝试恢复网络错误...');
                        hls.startLoad();
                        break;
                    case Hls.ErrorTypes.MEDIA_ERROR:
                        console.log('尝试恢复媒体错误...');
                        hls.recoverMediaError();
                        break;
                    default:
                        showError('播放失败,请刷新重试');
                        destroyPlayer();
                        return;
                }
            }
        });
        
        video.addEventListener('playing', () => {
            setStatus('active', '播放中');
            hideError();
        });
        
        video.addEventListener('waiting', () => {
            setStatus('loading', '缓冲中...');
        });
        
        video.addEventListener('error', () => {
            if (video.error) {
                showError('视频错误: ' + video.error.code);
            }
        });
        
        hls.loadSource(proxyUrl);
        hls.attachMedia(video);
        
    } else if (video.canPlayType('application/vnd.apple.mpegurl')) {
        // Safari 原生支持
        video.src = proxyUrl;
        video.addEventListener('loadedmetadata', () => {
            video.play();
            setStatus('active', '播放中');
        });
        video.addEventListener('error', () => {
            showError('播放失败');
        });
    } else {
        showError('浏览器不支持 HLS 播放');
    }
}

function loadPreset(url) {
    urlInput.value = url;
    play(url);
}

// 自动播放默认流
window.addEventListener('load', () => {
    if ('<?= addslashes($defaultUrl) ?>') {
        play('<?= addslashes($defaultUrl) ?>');
    }
});
</script>
</body>
</html>