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

// --- Authentication ---
$authHeader = $_SERVER['HTTP_AUTHORIZATION'] ?? null;
$expectedToken = 'Bearer aSecretToken123'; // Dummy token

if ($authHeader !== $expectedToken) {
    http_response_code(401);
    echo json_encode([
        'statusCode' => 401,
        'statusMessage' => 'Unauthorized'
    ]);
    exit;
}

// --- Request Method & Body ---
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode([
        'statusCode' => 405,
        'statusMessage' => 'Method Not Allowed'
    ]);
    exit;
}

$json_payload = file_get_contents('php://input');
$data = json_decode($json_payload, true);

// --- Validation ---
$required_fields = ['name', 'accountNumber', 'accountName', 'amount'];
$missing_fields = [];
foreach ($required_fields as $field) {
    if (empty($data[$field])) {
        $missing_fields[] = $field;
    }
}

if (!empty($missing_fields)) {
    http_response_code(400);
    echo json_encode([
        'statusCode' => 400,
        'statusMessage' => 'Bad Request',
        'error' => 'Missing required fields: ' . implode(', ', $missing_fields)
    ]);
    exit;
}

// --- Log Request (for debugging the dummy API itself) ---
// In a real app, you might not log to a file here, but it's useful for the dummy.
// The main app will log to its own DB.
$log_entry = [
    'timestamp' => date('c'),
    'request' => $data,
];

// --- Process and Respond ---
// Simulate some random failures for realism
$should_fail = rand(1, 10) > 8; // 20% chance of failure

if ($should_fail) {
    http_response_code(500);
    $response = [
        'statusCode' => 500,
        'statusMessage' => 'Internal Server Error',
        'error' => 'A simulated random error occurred.'
    ];
} else {
    http_response_code(200);
    $response = [
        'statusCode' => 200,
        'statusMessage' => 'sukses',
        'transactionId' => 'txn_' . uniqid()
    ];
}

$log_entry['response'] = $response;
file_put_contents('dummy_api_log.txt', json_encode($log_entry) . PHP_EOL, FILE_APPEND);

echo json_encode($response);