<?php

declare(strict_types=1);

/**
 * Uruk International Prize - Root Router & Gateway Proxy
 * Supports both direct server document root and /backend/public dispatching.
 */

$uri = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH);

// 1. Static asset serving (e.g., logo, css, js)
$filePath = __DIR__ . $uri;
if ($uri !== '/' && file_exists($filePath) && !is_dir($filePath)) {
    $extension = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
    $mimeTypes = [
        'png'  => 'image/png',
        'jpg'  => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'svg'  => 'image/svg+xml',
        'ico'  => 'image/x-icon',
        'css'  => 'text/css',
        'js'   => 'application/javascript',
        'html' => 'text/html; charset=UTF-8',
    ];
    if (isset($mimeTypes[$extension])) {
        header('Content-Type: ' . $mimeTypes[$extension]);
        readfile($filePath);
        exit;
    }
}

// 2. If requesting the feasibility presentation or homepage in browser
if ($uri === '/' || $uri === '/feasibility' || $uri === '/docs') {
    $htmlDoc = __DIR__ . '/docs/uruk_project_feasibility_and_architecture.html';
    if (file_exists($htmlDoc)) {
        header('Content-Type: text/html; charset=UTF-8');
        readfile($htmlDoc);
        exit;
    }
}

// 2. Dispatch all API routes and gateway endpoints to backend/public/index.php
$backendIndex = __DIR__ . '/backend/public/index.php';
if (file_exists($backendIndex)) {
    require_once $backendIndex;
    exit;
}

http_response_code(404);
echo json_encode([
    'success' => false,
    'error' => 'Core Backend Engine not found.',
]);