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<?php
/**
 * API endpoint to save user's selected variation for a track
 */
session_start();
header('Content-Type: application/json');

// Check if user is logged in
if (!isset($_SESSION['user_id'])) {
    http_response_code(401);
    echo json_encode(['success' => false, 'error' => 'Not logged in']);
    exit;
}

// Only allow POST requests
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'error' => 'Method not allowed']);
    exit;
}

require_once 'config/database.php';

// Get JSON input
$input = json_decode(file_get_contents('php://input'), true);
$track_id = (int)($input['track_id'] ?? 0);
$variation_index = (int)($input['variation_index'] ?? 0);

if (!$track_id) {
    echo json_encode(['success' => false, 'error' => 'Track ID required']);
    exit;
}

try {
    $pdo = getDBConnection();
    if (!$pdo) {
        throw new Exception('Database connection failed');
    }
    
    $user_id = $_SESSION['user_id'];
    
    // Verify the track belongs to the user
    $stmt = $pdo->prepare("SELECT id, user_id FROM music_tracks WHERE id = ?");
    $stmt->execute([$track_id]);
    $track = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$track) {
        echo json_encode(['success' => false, 'error' => 'Track not found']);
        exit;
    }
    
    if ($track['user_id'] != $user_id) {
        echo json_encode(['success' => false, 'error' => 'Not authorized to modify this track']);
        exit;
    }
    
    // Get the variation to make sure it exists
    $stmt = $pdo->prepare("SELECT id, audio_url, duration FROM audio_variations WHERE track_id = ? AND variation_index = ?");
    $stmt->execute([$track_id, $variation_index]);
    $variation = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$variation) {
        echo json_encode(['success' => false, 'error' => 'Variation not found']);
        exit;
    }
    
    // Update the track's selected variation
    $stmt = $pdo->prepare("UPDATE music_tracks SET selected_variation = ? WHERE id = ?");
    $stmt->execute([$variation_index, $track_id]);
    
    // Also update the main track's audio_url and duration to match the selected variation
    $stmt = $pdo->prepare("UPDATE music_tracks SET audio_url = ?, duration = ? WHERE id = ?");
    $stmt->execute([$variation['audio_url'], $variation['duration'], $track_id]);
    
    // Update or insert user preference
    $stmt = $pdo->prepare("
        INSERT INTO user_variation_preferences (user_id, track_id, variation_id, is_main_track, created_at, updated_at)
        VALUES (?, ?, ?, 1, NOW(), NOW())
        ON DUPLICATE KEY UPDATE variation_id = ?, is_main_track = 1, updated_at = NOW()
    ");
    $stmt->execute([$user_id, $track_id, $variation['id'], $variation['id']]);
    
    echo json_encode([
        'success' => true,
        'message' => 'Variation selection saved',
        'track_id' => $track_id,
        'variation_index' => $variation_index,
        'audio_url' => $variation['audio_url'],
        'duration' => $variation['duration']
    ]);
    
} catch (Exception $e) {
    error_log("Error saving variation selection: " . $e->getMessage());
    echo json_encode(['success' => false, 'error' => 'Database error: ' . $e->getMessage()]);
}