api.php

<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

$file = __DIR__ . '/compras.json';


if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    exit(0);
}


if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    if (file_exists($file)) {
        $data = file_get_contents($file);
        echo $data ? $data : json_encode([]);
    } else {
        echo json_encode([]);
    }
    exit;
}


if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input = file_get_contents('php://input');


    $decoded = json_decode($input, true);
    if (json_last_error() !== JSON_ERROR_NONE) {
        http_response_code(400);
        echo json_encode(['error' => 'Invalid JSON data']);
        exit;
    }


    if (file_put_contents($file, json_encode($decoded, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE))) {
        echo json_encode(['success' => true, 'data' => $decoded]);
    } else {
        http_response_code(500);
        echo json_encode(['error' => 'Could not save data to file']);
    }
    exit;
}


http_response_code(405);
echo json_encode(['error' => 'Method not allowed']);
?>