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<?php
/**
 * Migration: Add published_at column to music_tracks table
 * 
 * This column stores the permanent first-publish timestamp.
 * Once set, it never changes - prevents gaming the "newest" sorting.
 * 
 * Run this migration once to add the column.
 */

require_once __DIR__ . '/../config/database.php';

echo "Starting migration: add_published_at_column\n";
echo "============================================\n\n";

try {
    $pdo = getDBConnection();
    
    if (!$pdo) {
        throw new Exception("Failed to connect to database");
    }
    
    // Check if column already exists
    $stmt = $pdo->query("SHOW COLUMNS FROM music_tracks LIKE 'published_at'");
    $exists = $stmt->fetch();
    
    if ($exists) {
        echo "✓ Column 'published_at' already exists. Skipping.\n";
    } else {
        // Add the published_at column
        $pdo->exec("
            ALTER TABLE music_tracks 
            ADD COLUMN published_at TIMESTAMP NULL DEFAULT NULL
            AFTER is_public
        ");
        echo "✓ Added 'published_at' column to music_tracks table.\n";
    }
    
    // Backfill: Set published_at for tracks that are already public
    // Use their created_at date as the published_at
    $stmt = $pdo->prepare("
        UPDATE music_tracks 
        SET published_at = created_at 
        WHERE is_public = 1 
        AND published_at IS NULL
    ");
    $stmt->execute();
    $affected = $stmt->rowCount();
    
    if ($affected > 0) {
        echo "✓ Backfilled published_at for $affected existing public tracks.\n";
    } else {
        echo "✓ No existing public tracks needed backfill.\n";
    }
    
    // Add index for sorting performance
    try {
        $pdo->exec("
            CREATE INDEX idx_published_at ON music_tracks(published_at DESC)
        ");
        echo "✓ Added index on published_at column.\n";
    } catch (Exception $e) {
        if (strpos($e->getMessage(), 'Duplicate key name') !== false) {
            echo "✓ Index already exists. Skipping.\n";
        } else {
            throw $e;
        }
    }
    
    echo "\n============================================\n";
    echo "Migration completed successfully!\n";
    
} catch (Exception $e) {
    echo "✗ Migration failed: " . $e->getMessage() . "\n";
    exit(1);
}