<?php
// 管理员音乐审核页面（支持BV号显示和时长验证）
require_once 'db_config.php';

$message = '';
$message_type = '';

// 获取音频实际时长的函数
function getActualAudioDuration($file_path) {
    // 方法1: 使用ffmpeg（推荐，更准确）
    if (function_exists('shell_exec')) {
        $command = "ffmpeg -i " . escapeshellarg($file_path) . " 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//";
        $output = shell_exec($command);
        
        if ($output) {
            $duration = trim($output);
            // 转换为 MM:SS 格式
            list($hours, $minutes, $seconds) = explode(':', $duration);
            $seconds = floor((float)$seconds);
            if ((int)$hours > 0) {
                $minutes = (int)$minutes + (int)$hours * 60;
            }
            return sprintf('%d:%02d', $minutes, $seconds);
        }
    }
    
    // 方法2: 使用getid3库（如果安装了）
    if (class_exists('getID3')) {
        $getID3 = new getID3;
        $fileInfo = $getID3->analyze($file_path);
        if (!empty($fileInfo['playtime_seconds'])) {
            $seconds = floor($fileInfo['playtime_seconds']);
            $minutes = floor($seconds / 60);
            $seconds = $seconds % 60;
            return sprintf('%d:%02d', $minutes, $seconds);
        }
    }
    
    return false; // 无法获取时长
}

// 处理审核操作
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_POST['approve_id'])) {
        $id = $_POST['approve_id'];
        try {
            // 1. 获取待审核音乐信息（包含BV号和用户输入的时长）
            $stmt = $conn->prepare("SELECT * FROM pending_music WHERE id = ?");
            $stmt->execute([$id]);
            $music = $stmt->fetch(PDO::FETCH_ASSOC);

            if ($music) {
                // 2. 验证音频时长（如果可能）
                $duration_mismatch = false;
                $actual_duration = getActualAudioDuration($music['file_path']);
                
                if ($actual_duration && $actual_duration !== $music['duration']) {
                    // 时长不匹配，设置标志但仍继续处理（只是提醒管理员）
                    $duration_mismatch = true;
                    $message .= "注意：用户填写的时长（{$music['duration']}）与实际音频时长（{$actual_duration}）不匹配。";
                }
                
                // 3. 将信息插入正式音乐表（包含BV号字段）
                // 如果有实际时长，使用实际时长覆盖用户输入
                $final_duration = $actual_duration ?: $music['duration'];
                
                $stmt_insert = $conn->prepare("INSERT INTO music 
                                              (title, artist, category, description, file_path, duration, upload_time, uploader_name, bvid)
                                              VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");
                $stmt_insert->execute([
                    $music['title'], $music['artist'], $music['category'],
                    $music['description'], $music['file_path'], $final_duration,
                    $music['upload_time'], $music['uploader_name'], $music['bvid'] ?? ''
                ]);

                // 4. 从待审核表中删除
                $stmt_delete = $conn->prepare("DELETE FROM pending_music WHERE id = ?");
                $stmt_delete->execute([$id]);
                
                // 构建成功消息
                $base_message = "音乐《" . htmlspecialchars($music['title']) . "》已通过审核！";
                if ($duration_mismatch) {
                    $message = $base_message . " " . $message;
                } else {
                    $message = $base_message;
                }
                $message_type = "success";
            }
        } catch (PDOException $e) {
            $message = "数据库错误: " . $e->getMessage();
            $message_type = "error";
        }
    } elseif (isset($_POST['reject_id'])) {
        $id = $_POST['reject_id'];
        try {
            // 获取文件路径用于删除
            $stmt = $conn->prepare("SELECT file_path, title FROM pending_music WHERE id = ?");
            $stmt->execute([$id]);
            $music = $stmt->fetch(PDO::FETCH_ASSOC);

            if ($music) {
                // 删除服务器上的文件
                if (file_exists($music['file_path'])) {
                    unlink($music['file_path']);
                }

                // 从待审核表中删除记录
                $stmt_delete = $conn->prepare("DELETE FROM pending_music WHERE id = ?");
                $stmt_delete->execute([$id]);
                
                $message = "音乐《" . htmlspecialchars($music['title']) . "》已驳回并删除。";
                $message_type = "success";
            }
        } catch (PDOException $e) {
            $message = "数据库错误: " . $e->getMessage();
            $message_type = "error";
        }
    }
}

// 获取所有待审核音乐（包含BV号）并计算实际时长
try {
    $stmt = $conn->query("SELECT * FROM pending_music ORDER BY upload_time DESC");
    $pending_music = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    // 为每条音乐获取实际时长并检查是否匹配
    foreach ($pending_music as &$music) {
        $actual_duration = getActualAudioDuration($music['file_path']);
        $music['actual_duration'] = $actual_duration;
        $music['duration_match'] = ($actual_duration === $music['duration']);
    }
    unset($music); // 解除引用
} catch (PDOException $e) {
    $message = "无法加载待审核列表: " . $e->getMessage();
    $message_type = "error";
    $pending_music = [];
}

$categories = [
    'cantonese' => '粤语歌曲', 'mandarin' => '国语歌曲', 'waiyu' => '外语歌曲',
    'classic' => '经典老歌', 'other' => '其他音乐'
];
?>
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>管理员审核 - 音乐分享平台</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        body { font-family: 'Arial', sans-serif; background-color: #f7f9fc; margin: 0; }
        .container { max-width: 1600px; margin: 2rem auto; padding: 0 1rem; }
        h1 { color: #2c3e50; border-bottom: 2px solid #e74c3c; padding-bottom: 0.5rem; }
        .message { padding: 1rem; border-radius: 8px; margin-bottom: 1rem; text-align: center; }
        .success { background-color: #d4edda; color: #155724; }
        .error { background-color: #f8d7da; color: #721c24; }
        .warning { background-color: #fff3cd; color: #856404; }
        table { width: 100%; border-collapse: collapse; background: white; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
        th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid #f1f2f6; }
        th { background-color: #2c3e50; color: white; }
        tr:hover { background-color: #fafafa; }
        .btn { padding: 0.5rem 1rem; border: none; border-radius: 4px; cursor: pointer; font-size: 0.9rem; transition: background-color 0.3s; margin-right: 5px; }
        .btn-approve { background-color: #2ecc71; color: white; }
        .btn-approve:hover { background-color: #27ae60; }
        .btn-reject { background-color: #e74c3c; color: white; }
        .btn-reject:hover { background-color: #c0392b; }
        .audio-player { width: 100%; max-width: 250px; }
        .action-form { display: inline; }
        .header-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
        .back-link { color: #2c3e50; text-decoration: none; font-weight: 500; }
        .back-link:hover { text-decoration: underline; }
        .bvid-link { color: #3498db; text-decoration: none; }
        .bvid-link:hover { text-decoration: underline; }
        .no-bvid { color: #95a5a6; font-style: italic; }
        .duration-match { color: #27ae60; font-weight: 500; }
        .duration-mismatch { color: #e74c3c; font-weight: 500; }
        .duration-info { display: flex; flex-direction: column; gap: 4px; }
        .duration-note { font-size: 0.8rem; color: #7f8c8d; }
        .tooltip { position: relative; display: inline-block; }
        .tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: #333;
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.8rem;
        }
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header-actions">
            <h1><i class="fas fa-tasks"></i> 音乐审核管理</h1>
            <a href="index.php" class="back-link"><i class="fas fa-arrow-left"></i> 返回首页</a>
        </div>
        
        <?php if ($message): ?>
            <div class="message <?php echo $message_type; ?>"><?php echo $message; ?></div>
        <?php endif; ?>
        
        <?php if (empty($pending_music)): ?>
            <p class="message success">当前没有待审核的音乐。</p>
        <?php else: ?>
            <table>
                <thead>
                    <tr>
                        <th>ID</th>
                        <th>标题</th>
                        <th>歌手</th>
                        <th>上传者</th>
                        <th>分类</th>
                        <th>BV号</th>
                        <th>时长信息</th> <!-- 改进为时长信息列，包含用户输入和实际时长 -->
                        <th>上传时间</th>
                        <th>预览</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($pending_music as $music): ?>
                        <tr>
                            <td><?php echo $music['id']; ?></td>
                            <td><?php echo htmlspecialchars($music['title']); ?></td>
                            <td><?php echo htmlspecialchars($music['artist']); ?></td>
                            <td><?php echo htmlspecialchars($music['uploader_name']); ?></td>
                            <td><?php echo $categories[$music['category']]; ?></td>
                            <td>
                                <?php if (!empty($music['bvid'])): ?>
                                    <a href="https://www.bilibili.com/video/<?php echo htmlspecialchars($music['bvid']); ?>" 
                                       target="_blank" class="bvid-link">
                                        <?php echo htmlspecialchars($music['bvid']); ?>
                                    </a>
                                <?php else: ?>
                                    <span class="no-bvid">无</span>
                                <?php endif; ?>
                            </td>
                            <td>
                                <div class="duration-info">
                                    <?php if ($music['actual_duration']): ?>
                                        <div>
                                            用户输入: <span><?php echo $music['duration']; ?></span>
                                        </div>
                                        <div>
                                            实际时长: <span class="<?php echo $music['duration_match'] ? 'duration-match' : 'duration-mismatch'; ?>">
                                                <?php echo $music['actual_duration']; ?>
                                            </span>
                                        </div>
                                        <?php if (!$music['duration_match']): ?>
                                            <div class="tooltip">
                                                <i class="fas fa-exclamation-triangle"></i>
                                                <span class="tooltip-text">时长不匹配，通过审核后将使用实际时长</span>
                                            </div>
                                        <?php endif; ?>
                                    <?php else: ?>
                                        <div>
                                            用户输入: <span><?php echo $music['duration']; ?></span>
                                        </div>
                                        <div class="duration-note">
                                            <i class="fas fa-info-circle"></i> 无法获取实际音频时长
                                        </div>
                                    <?php endif; ?>
                                </div>
                            </td>
                            <td><?php echo $music['upload_time']; ?></td>
                            <td><audio controls class="audio-player">
                                <source src="<?php echo htmlspecialchars($music['file_path']); ?>" type="audio/mpeg">
                                您的浏览器不支持音频播放。
                            </audio></td>
                            <td>
                                <form class="action-form" method="post" onsubmit="
                                    <?php if (!$music['duration_match'] && $music['actual_duration']): ?>
                                        return confirm('注意：用户填写的时长与实际时长不匹配！\n用户输入: <?php echo $music['duration']; ?>\n实际时长: <?php echo $music['actual_duration']; ?>\n\n确定要通过这首音乐吗？将使用实际时长。');
                                    <?php else: ?>
                                        return confirm('确定要通过这首音乐吗？');
                                    <?php endif; ?>
                                ">
                                    <button type="submit" name="approve_id" value="<?php echo $music['id']; ?>" class="btn btn-approve"><i class="fas fa-check"></i> 通过</button>
                                </form>
                                <form class="action-form" method="post" onsubmit="return confirm('确定要驳回并删除这首音乐吗？此操作不可恢复！');">
                                    <button type="submit" name="reject_id" value="<?php echo $music['id']; ?>" class="btn btn-reject"><i class="fas fa-times"></i> 驳回</button>
                                </form>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        <?php endif; ?>
    </div>
</body>
</html>