<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *'); // Allow CORS for frontend
header('Access-Control-Allow-Methods: GET, POST');
header('Access-Control-Allow-Headers: Content-Type');

$jsonFile = 'playlists.json';

// Initialize the JSON file if it doesn't exist
if (!file_exists($jsonFile)) {
    file_put_contents($jsonFile, json_encode([]));
}

// Handle POST request to save a new playlist URL
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input = json_decode(file_get_contents('php://input'), true);
    if (isset($input['url'])) {
        $url = filter_var($input['url'], FILTER_SANITIZE_URL);
        if ($url && (stripos($url, 'http://') === 0 || stripos($url, 'https://') === 0)) {
            $playlists = json_decode(file_get_contents($jsonFile), true);
            $playlists[] = [
                'url' => $url,
                'timestamp' => date('c') // ISO 8601 timestamp
            ];
            // Keep only the last 100 entries
            $playlists = array_slice($playlists, -100);
            file_put_contents($jsonFile, json_encode($playlists, JSON_PRETTY_PRINT));
            echo json_encode(['status' => 'success']);
            exit;
        }
    }
    echo json_encode(['status' => 'error', 'message' => 'Invalid URL']);
    exit;
}

// Handle GET request to retrieve recent playlists
$playlists = json_decode(file_get_contents($jsonFile), true);
echo json_encode(array_reverse($playlists)); // Newest first
?>