<?php
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS");
header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

// Auto-loader for classes (simple version)
spl_autoload_register(function ($class) {
    $prefix = 'Saqel\\';
    $base_dir = __DIR__ . '/../src/';
    $len = strlen($prefix);
    if (strncmp($prefix, $class, $len) !== 0) {
        return;
    }
    $relative_class = substr($class, $len);
    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
    if (file_exists($file)) {
        require $file;
    }
});

use Saqel\Router;
use Saqel\Database;

$router = new Router();

$router->add('GET', '/', function() {
    echo json_encode([
        'status' => 'success',
        'message' => 'Saqel API is running in Pure PHP mode!'
    ]);
});

$router->add('GET', '/api/ping', function() {
    $time_start = microtime(true);
    
    // Test DB connection
    $db = Database::getInstance()->getConnection();
    $stmt = $db->query("SELECT 1");
    $dbStatus = $stmt ? 'connected' : 'failed';
    
    $time_end = microtime(true);
    $execution_time = ($time_end - $time_start) * 1000;
    
    echo json_encode([
        'status' => 'success',
        'message' => 'Saqel Pure PHP Backend is running incredibly fast!',
        'database' => $dbStatus,
        'execution_time_ms' => round($execution_time, 2)
    ]);
});

// Example route for user login (Mock)
$router->add('POST', '/api/auth/login', function() {
    $data = json_decode(file_get_contents("php://input"), true);
    
    // In a real app, query Database here and verify password
    if (isset($data['email']) && isset($data['password'])) {
        echo json_encode([
            'access_token' => bin2hex(random_bytes(16)),
            'token_type' => 'Bearer',
            'user' => [
                'email' => $data['email'],
                'role' => 'student'
            ]
        ]);
    } else {
        header("HTTP/1.0 400 Bad Request");
        echo json_encode(['error' => 'Missing email or password']);
    }
});

$router->dispatch($_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI']);