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<?php
// Comprehensive fix for variation audio URLs - handles both MD5 and base64 formats
session_start();

echo "<h2>Comprehensive Fix for Variation Audio URLs</h2>";

require_once 'config/database.php';
$pdo = getDBConnection();

if (!$pdo) {
    echo "Database connection failed";
    exit;
}

// Get all variations that still have external URLs
$stmt = $pdo->query("
    SELECT 
        av.id,
        av.track_id,
        av.variation_index,
        av.audio_url,
        av.source_audio_url,
        mt.audio_url as main_track_url
    FROM audio_variations av
    JOIN music_tracks mt ON av.track_id = mt.id
    WHERE av.audio_url LIKE '%cdn1.suno.ai%' 
       OR av.audio_url LIKE '%apiboxfiles.erweima.ai%'
       OR av.audio_url LIKE '%mfile.erweima.ai%'
    ORDER BY av.track_id, av.variation_index
");

$variations = $stmt->fetchAll();

if (empty($variations)) {
    echo "<p>No variations with external URLs found.</p>";
    exit;
}

echo "<p>Found " . count($variations) . " variations with external URLs that need fixing.</p>";

$updated = 0;
$errors = 0;

foreach ($variations as $variation) {
    echo "<h3>Variation ID: {$variation['id']} (Track: {$variation['track_id']}, Index: {$variation['variation_index']})</h3>";
    
    $main_url = $variation['main_track_url'];
    $local_path = null;
    
    // Try to extract hash from different URL formats
    if (preg_match('/\/([a-f0-9]{32})\.mp3$/', $main_url, $matches)) {
        // MD5 hash format
        $hash = $matches[1];
        $local_path = "/audio_files/{$hash}_variation_{$variation['variation_index']}.mp3";
        echo "<p>🔍 Found MD5 hash: {$hash}</p>";
        
    } elseif (preg_match('/\/([A-Za-z0-9+\/]{20,})\.mp3$/', $main_url, $matches)) {
        // Base64 encoded format
        $base64_filename = $matches[1];
        echo "<p>🔍 Found base64 filename: {$base64_filename}</p>";
        
        // Try to find matching local files by looking for variations with this track ID
        $local_files = glob(__DIR__ . "/audio_files/*_variation_{$variation['variation_index']}.mp3");
        
        if (!empty($local_files)) {
            // Find the file that belongs to this track by checking the track's main audio file
            $track_stmt = $pdo->prepare("SELECT audio_url FROM music_tracks WHERE id = ?");
            $track_stmt->execute([$variation['track_id']]);
            $track = $track_stmt->fetch();
            
            if ($track && $track['audio_url']) {
                // Extract the hash from the track's main audio URL
                if (preg_match('/\/([a-f0-9]{32})\.mp3$/', $track['audio_url'], $track_matches)) {
                    $track_hash = $track_matches[1];
                    $local_path = "/audio_files/{$track_hash}_variation_{$variation['variation_index']}.mp3";
                    echo "<p>🔍 Found track hash: {$track_hash}</p>";
                }
            }
        }
        
        if (!$local_path) {
            echo "<p>⚠️ Could not determine local path for base64 format</p>";
        }
    }
    
    if ($local_path) {
        // Check if the local file exists
        $local_file_path = __DIR__ . $local_path;
        if (file_exists($local_file_path)) {
            echo "<p>✅ Local file exists: {$local_path}</p>";
            
            // Update the database
            try {
                $update_stmt = $pdo->prepare("
                    UPDATE audio_variations 
                    SET audio_url = ?, source_audio_url = ?
                    WHERE id = ?
                ");
                
                $result = $update_stmt->execute([$local_path, $local_path, $variation['id']]);
                
                if ($result) {
                    echo "<p>✅ Updated variation {$variation['id']} to use local path: {$local_path}</p>";
                    $updated++;
                } else {
                    echo "<p>❌ Failed to update variation {$variation['id']}</p>";
                    $errors++;
                }
            } catch (Exception $e) {
                echo "<p>❌ Error updating variation {$variation['id']}: " . htmlspecialchars($e->getMessage()) . "</p>";
                $errors++;
            }
        } else {
            echo "<p>❌ Local file not found: {$local_file_path}</p>";
            
            // Try to find any variation file for this track
            $any_variation_files = glob(__DIR__ . "/audio_files/*_variation_{$variation['variation_index']}.mp3");
            if (!empty($any_variation_files)) {
                echo "<p>🔍 Found variation files: " . implode(', ', array_map('basename', $any_variation_files)) . "</p>";
            }
            
            $errors++;
        }
    } else {
        echo "<p>❌ Could not determine local path for URL: {$main_url}</p>";
        $errors++;
    }
    
    echo "<hr>";
}

echo "<h2>Summary</h2>";
echo "<p>✅ Successfully updated: {$updated} variations</p>";
echo "<p>❌ Errors: {$errors} variations</p>";

if ($updated > 0) {
    echo "<p><strong>Variation audio URLs have been fixed! They should now play from your local server.</strong></p>";
}

// Show remaining variations that still need fixing
if ($errors > 0) {
    echo "<h3>Remaining Variations to Fix:</h3>";
    
    $remaining_stmt = $pdo->query("
        SELECT 
            av.id,
            av.track_id,
            av.variation_index,
            av.audio_url,
            mt.audio_url as main_track_url
        FROM audio_variations av
        JOIN music_tracks mt ON av.track_id = mt.id
        WHERE av.audio_url LIKE '%cdn1.suno.ai%' 
           OR av.audio_url LIKE '%apiboxfiles.erweima.ai%'
           OR av.audio_url LIKE '%mfile.erweima.ai%'
        ORDER BY av.track_id, av.variation_index
        LIMIT 10
    ");
    
    $remaining = $remaining_stmt->fetchAll();
    
    foreach ($remaining as $var) {
        echo "<p>Track {$var['track_id']}, Variation {$var['variation_index']}: {$var['audio_url']}</p>";
    }
    
    if (count($remaining) >= 10) {
        echo "<p>... and " . ($errors - 10) . " more</p>";
    }
}
?>