<?php

declare(strict_types=1);

define('APP_ROOT', dirname(__DIR__));
define('APP_DATA', APP_ROOT . '/data');

function app_configure_php_error_logging(): void
{
    ini_set('log_errors', '1');
    ini_set('error_log', APP_DATA . '/php_errors.log');
}

spl_autoload_register(static function (string $class): void {
    $prefix = 'App\\';
    if (!str_starts_with($class, $prefix)) {
        return;
    }

    $relative = substr($class, strlen($prefix));
    $path = APP_ROOT . '/src/' . str_replace('\\', '/', $relative) . '.php';

    if (is_file($path)) {
        require_once $path;
    }
});

date_default_timezone_set('Europe/Berlin');
app_configure_php_error_logging();

function app_config_repository(): App\ConfigRepository
{
    static $repository = null;

    if ($repository === null) {
        $repository = new App\ConfigRepository(APP_DATA . '/config.json');
    }

    return $repository;
}

function app_state_repository(): App\StateRepository
{
    static $repository = null;

    if ($repository === null) {
        $repository = new App\StateRepository(APP_DATA . '/state.json');
    }

    return $repository;
}

function app_alert_service(): App\AlertService
{
    static $service = null;

    if ($service === null) {
        $service = new App\AlertService(app_config_repository(), APP_DATA . '/alert_log.json');
    }

    return $service;
}

function app_monitor_service(): App\MonitorService
{
    static $service = null;

    if ($service === null) {
        $service = new App\MonitorService(
            app_config_repository(),
            app_state_repository(),
            app_alert_service()
        );
    }

    return $service;
}

function app_admin_auth(): App\AdminAuth
{
    static $auth = null;

    if ($auth === null) {
        $auth = new App\AdminAuth(app_config_repository());
    }

    return $auth;
}

function app_json_response(array $payload, int $statusCode = 200): never
{
    http_response_code($statusCode);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($payload, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
    exit;
}

function app_redirect(string $location): never
{
    header('Location: ' . $location);
    exit;
}

function app_normalize_base_path(?string $basePath): string
{
    $normalized = trim((string) $basePath);
    if ($normalized === '' || $normalized === '/') {
        return '';
    }

    $normalized = '/' . trim($normalized, '/');

    return $normalized === '/' ? '' : $normalized;
}

function app_base_path(): string
{
    static $basePath = null;

    if ($basePath === null) {
        $config = app_config_repository()->getConfig();
        $basePath = app_normalize_base_path((string) ($config['app']['base_path'] ?? ''));
    }

    return $basePath;
}

function app_url(string $path = '/'): string
{
    $basePath = app_base_path();
    $normalizedPath = '/' . ltrim($path, '/');

    if ($normalizedPath === '/') {
        return $basePath === '' ? '/' : $basePath . '/';
    }

    return $basePath . $normalizedPath;
}

function app_read_json_body(): array
{
    $raw = file_get_contents('php://input');
    if ($raw === false || trim($raw) === '') {
        return [];
    }

    $decoded = json_decode($raw, true);
    if (!is_array($decoded)) {
        throw new RuntimeException('Ungültiger JSON-Body.');
    }

    return $decoded;
}