<?php
declare(strict_types=1);

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

$storageDir = __DIR__ . '/../data';
$storageFile = $storageDir . '/scores.json';

if (!is_dir($storageDir)) {
    mkdir($storageDir, 0777, true);
}
if (!file_exists($storageFile)) {
    file_put_contents($storageFile, json_encode([], JSON_PRETTY_PRINT));
}

function loadScores(string $file): array {
    $raw = file_get_contents($file);
    if ($raw === false || trim($raw) === '') {
        return [];
    }
    $decoded = json_decode($raw, true);
    return is_array($decoded) ? $decoded : [];
}

function saveScores(string $file, array $scores): void {
    usort($scores, fn($a, $b) => ($b['score'] ?? 0) <=> ($a['score'] ?? 0));
    $scores = array_slice($scores, 0, 10);
    file_put_contents($file, json_encode($scores, JSON_PRETTY_PRINT));
}

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

if ($method === 'GET') {
    $scores = loadScores($storageFile);
    usort($scores, fn($a, $b) => ($b['score'] ?? 0) <=> ($a['score'] ?? 0));
    echo json_encode(array_slice($scores, 0, 10));
    exit;
}

if ($method === 'POST') {
    $payload = json_decode(file_get_contents('php://input') ?: '{}', true);
    $name = trim((string)($payload['name'] ?? 'Anonymous'));
    $score = (int)($payload['score'] ?? 0);

    if ($name === '') $name = 'Anonymous';
    $name = mb_substr($name, 0, 20);
    if ($score < 0) $score = 0;

    $scores = loadScores($storageFile);
    $scores[] = [
        'name' => $name,
        'score' => $score,
        'date' => date('c')
    ];

    saveScores($storageFile, $scores);

    echo json_encode(['ok' => true]);
    exit;
}

http_response_code(405);
echo json_encode(['error' => 'Method Not Allowed']);