<?php
declare(strict_types=1);

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

function json_response($data, int $status = 200): void
{
    http_response_code($status);
    echo json_encode($data, JSON_UNESCAPED_SLASHES);
    exit;
}

function input_json(): array
{
    $raw = file_get_contents('php://input');
    $data = json_decode($raw ?: '{}', true);
    return is_array($data) ? $data : [];
}

function db(): PDO
{
    $configPath = __DIR__ . '/config.php';
    if (!file_exists($configPath)) {
        json_response(['error' => 'Missing api/config.php database settings.'], 503);
    }

    $config = require $configPath;
    $dsn = sprintf(
        'mysql:host=%s;dbname=%s;charset=utf8mb4',
        $config['host'],
        $config['database']
    );

    return new PDO($dsn, $config['username'], $config['password'], [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    ]);
}

function text_value(array $data, string $key): string
{
    return isset($data[$key]) ? trim((string) $data[$key]) : '';
}

function json_value(array $data, string $key): string
{
    return json_encode($data[$key] ?? [], JSON_UNESCAPED_SLASHES);
}