<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');

require_once __DIR__ . '/../lib/tetris_store.php';

function respond(int $status, array $payload): void
{
    http_response_code($status);
    echo json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

try {
    if ($_SERVER['REQUEST_METHOD'] === 'GET') {
        $limit = isset($_GET['limit']) ? (int) $_GET['limit'] : 12;
        $id = isset($_GET['id']) ? (int) $_GET['id'] : 0;

        if ($id > 0) {
            $score = tetrisFetchScore($id);
            if (!$score) {
                respond(404, ['success' => false, 'message' => 'Score not found.']);
            }

            respond(200, [
                'success' => true,
                'score' => $score,
                'rank' => tetrisFetchScoreRank($id),
            ]);
        }

        respond(200, [
            'success' => true,
            'scores' => tetrisFetchTopScores($limit),
            'recent' => tetrisFetchRecentScores(6),
        ]);
    }

    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        respond(405, ['success' => false, 'message' => 'Method not allowed.']);
    }

    $raw = file_get_contents('php://input');
    $data = json_decode($raw ?: '{}', true);
    if (!is_array($data)) {
        respond(400, ['success' => false, 'message' => 'Invalid JSON payload.']);
    }

    $result = tetrisInsertScore($data);
    respond(201, [
        'success' => true,
        'message' => 'Score submitted to the online leaderboard.',
        'score' => $result['score'],
        'rank' => $result['rank'],
        'scores' => tetrisFetchTopScores(12),
    ]);
} catch (InvalidArgumentException $exception) {
    respond(422, ['success' => false, 'message' => $exception->getMessage()]);
} catch (Throwable $exception) {
    error_log('Tetris score API error: ' . $exception->getMessage());
    respond(500, ['success' => false, 'message' => 'Leaderboard service is temporarily unavailable.']);
}