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<?php
/**
 * Migration: Add title_user_modified column to music_tracks
 * 
 * This column tracks whether a user has explicitly modified the track title.
 * When true, auto-fix scripts and callbacks will NOT overwrite the title.
 * 
 * Run once: https://soundstudiopro.com/migrations/add_title_user_modified_column.php
 */

require_once dirname(__DIR__) . '/config/database.php';

echo "<h1>Migration: Add title_user_modified Column</h1>";

try {
    $pdo = getDBConnection();
    
    // Check if column already exists
    $stmt = $pdo->query("SHOW COLUMNS FROM music_tracks LIKE 'title_user_modified'");
    $exists = $stmt->fetch();
    
    if ($exists) {
        echo "<p style='color: orange;'>⚠️ Column 'title_user_modified' already exists. No changes made.</p>";
    } else {
        // Add the column
        $pdo->exec("
            ALTER TABLE music_tracks 
            ADD COLUMN title_user_modified TINYINT(1) NOT NULL DEFAULT 0 
            COMMENT 'Set to 1 when user explicitly edits title, prevents auto-overwrite'
            AFTER title
        ");
        
        echo "<p style='color: green;'>✅ Column 'title_user_modified' added successfully!</p>";
        
        // Set flag for tracks that already have non-default titles
        // (Assumes if title exists and isn't default, user may have set it)
        $result = $pdo->exec("
            UPDATE music_tracks 
            SET title_user_modified = 1 
            WHERE title IS NOT NULL 
            AND title != '' 
            AND title != 'Untitled Track' 
            AND title != 'Generated Track'
            AND status = 'complete'
        ");
        
        echo "<p style='color: green;'>✅ Set title_user_modified=1 for $result existing tracks with custom titles.</p>";
    }
    
    // Show current stats
    $stmt = $pdo->query("
        SELECT 
            COUNT(*) as total,
            SUM(CASE WHEN title_user_modified = 1 THEN 1 ELSE 0 END) as user_modified,
            SUM(CASE WHEN title_user_modified = 0 THEN 1 ELSE 0 END) as auto_managed
        FROM music_tracks
    ");
    $stats = $stmt->fetch(PDO::FETCH_ASSOC);
    
    echo "<h2>Current Stats</h2>";
    echo "<p>Total tracks: {$stats['total']}</p>";
    echo "<p>User-modified titles (protected): {$stats['user_modified']}</p>";
    echo "<p>Auto-managed titles: {$stats['auto_managed']}</p>";
    
    echo "<h2>✅ Migration Complete</h2>";
    
} catch (Exception $e) {
    echo "<p style='color: red;'>❌ Error: " . htmlspecialchars($e->getMessage()) . "</p>";
}
?>