<?php
require 'db.php';

header('Content-Type: application/json');

try {
    $stmt = $pdo->query("
        SELECT u.id AS user_id, u.username, s.wins, s.losses
        FROM users u
        LEFT JOIN users_stats s ON s.user_id = u.id
        GROUP BY u.id
        ORDER BY s.wins DESC, s.losses ASC
        LIMIT 20
    ");

    $rows = $stmt->fetchAll();
    echo json_encode($rows);

} catch (Exception $e) {
    echo json_encode([
        "error" => $e->getMessage()
    ]);
}