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<?php
/**
 * Update Now Playing
 * POST /api/radio/v1/now-playing
 * 
 * Updates the currently playing track for a station
 */

$pdo = getDBConnection();

// Get station_id from authenticated station
$station_id = $station['id'];

// Get request data
$input = json_decode(file_get_contents('php://input'), true);
$track_id = $input['track_id'] ?? null;
$listener_count = $input['listener_count'] ?? 0;

if (!$track_id) {
    http_response_code(400);
    echo json_encode(['error' => 'track_id is required']);
    exit;
}

// Verify track exists and is radio enabled
$stmt = $pdo->prepare("
    SELECT id, duration FROM music_tracks 
    WHERE id = ? AND radio_enabled = 1 AND status = 'complete'
");
$stmt->execute([$track_id]);
$track = $stmt->fetch(PDO::FETCH_ASSOC);

if (!$track) {
    http_response_code(404);
    echo json_encode(['error' => 'Track not found or not available for radio']);
    exit;
}

// Mark previous now playing as not live
$pdo->prepare("
    UPDATE radio_now_playing 
    SET is_live = FALSE 
    WHERE station_id = ? AND is_live = TRUE
")->execute([$station_id]);

// Calculate estimated end time
$duration = $track['duration'] ?? 180; // Default 3 minutes if not set
$estimated_end = date('Y-m-d H:i:s', strtotime("+{$duration} seconds"));

// Create new now playing entry
$stmt = $pdo->prepare("
    INSERT INTO radio_now_playing (
        station_id, track_id, estimated_end_at, listener_count, is_live
    ) VALUES (?, ?, ?, ?, TRUE)
");

$stmt->execute([
    $station_id,
    $track_id,
    $estimated_end,
    $listener_count
]);

$now_playing_id = $pdo->lastInsertId();

// Get full now playing data
$stmt = $pdo->prepare("
    SELECT 
        np.*,
        t.id as track_id,
        t.title,
        t.artist_name,
        t.genre,
        t.duration
    FROM radio_now_playing np
    JOIN music_tracks t ON np.track_id = t.id
    WHERE np.id = ?
");

$stmt->execute([$now_playing_id]);
$now_playing = $stmt->fetch(PDO::FETCH_ASSOC);

echo json_encode([
    'success' => true,
    'now_playing' => $now_playing,
    'message' => 'Now playing updated successfully'
]);