<?php
$path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
$counterFile = __DIR__ . '/retry-counter.txt';

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

if ($path !== '/orders/42') {
    http_response_code(404);
    echo json_encode(['error' => 'not found']) . PHP_EOL;
    return;
}

$attempt = is_file($counterFile) ? (int) file_get_contents($counterFile) : 0;
$attempt++;
file_put_contents($counterFile, (string) $attempt);

if ($attempt < 3) {
    http_response_code(503);
    echo json_encode([
        'status' => 'busy',
        'attempt' => $attempt,
    ], JSON_UNESCAPED_SLASHES) . PHP_EOL;
    return;
}

echo json_encode([
    'status' => 'ok',
    'attempt' => $attempt,
], JSON_UNESCAPED_SLASHES) . PHP_EOL;