<?php

namespace Automad;

use Automad\API\RequestHandler;
use Automad\API\Response;
use Automad\Admin\Dashboard;
use Automad\Controllers\PageController;
use Automad\Core\Cache;
use Automad\Core\Feed;
use Automad\Core\Parse;
use Automad\Core\Router;
use Automad\Core\Session;
use Automad\Models\UserCollection;

/**
 * The Routes class.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2022-2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class Routes
{
	/** An array of reserved routes that can't be used by any page. */
	public static array $registered = array();


	/**
	 * Register routes to a giver Router.
	 *
	 * @param Router $Router
	 */
	public static function init(Router $Router): void
	{
		$isAuthenticatedUser = AM_PAGE_DASHBOARD && Session::getUsername();

		self::registerAPIRoutes($Router, $isAuthenticatedUser);
		self::registerDashboardRoutes($Router, $isAuthenticatedUser);
		self::registerFeedRoute($Router);
		self::registerPageRoutes($Router);

		self::$registered = $Router->getRoutes();
	}


	/**
	 * Redirect to a given route
	 *
	 * @param string $route
	 */
	private static function redirectDashboard(string $route): void
	{
		header('Location: ' . AM_BASE_INDEX . AM_PAGE_DASHBOARD . $route, true, 301);
		exit();
	}


	/**
	 * Register API routes.
	 *
	 * @param Router $Router
	 * @param bool $isAuthenticatedUser
	 */
	private static function registerAPIRoutes(Router $Router, bool $isAuthenticatedUser): void
	{
		$apiBase = RequestHandler::$apiBase;

		$Router->register(
			"$apiBase/.*",
			function () {
				return RequestHandler::getResponse();
			},
			$isAuthenticatedUser
		);

		$Router->register(
			"$apiBase/(Session/login|Session/validate|App/bootstrap|User/resetPassword)",
			function () {
				return RequestHandler::getResponse();
			},
			AM_PAGE_DASHBOARD
		);

		$Router->register(
			"$apiBase/.*",
			function () {
				header('Content-Type: application/json; charset=utf-8');

				$Response = new Response();
				$Response->setRedirect('login');

				exit($Response->json());
			},
			AM_PAGE_DASHBOARD
		);
	}


	/**
	 * Register dashboard routes.
	 *
	 * @param Router $Router
	 * @param bool $isAuthenticatedUser
	 */
	private static function registerDashboardRoutes(Router $Router, bool $isAuthenticatedUser): void
	{
		$hasAccounts = is_readable(UserCollection::FILE_ACCOUNTS);

		$Router->register(
			AM_PAGE_DASHBOARD . '/setup',
			function () {
				return Dashboard::render();
			},
			!$hasAccounts
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '(/.*)?',
			function () {
				self::redirectDashboard('/setup');
			},
			!$hasAccounts
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '/setup',
			function () {
				self::redirectDashboard('/login');
			},
			$hasAccounts
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '/(login|resetpassword)',
			function () {
				self::redirectDashboard('/home');
			},
			$isAuthenticatedUser
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '/(login|resetpassword)',
			function () {
				return Dashboard::render();
			},
			AM_PAGE_DASHBOARD
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '(/.*)?',
			function () {
				return Dashboard::render();
			},
			$isAuthenticatedUser
		);

		$Router->register(
			AM_PAGE_DASHBOARD . '(/.*)?',
			function () {
				self::redirectDashboard('/login');
			},
			AM_PAGE_DASHBOARD
		);
	}


	/**
	 * Register the RSS feed route.
	 *
	 * @param Router $Router
	 */
	private static function registerFeedRoute(Router $Router): void
	{
		$Router->register(
			AM_FEED_URL,
			function () {
				header('Content-Type: application/rss+xml; charset=UTF-8');

				$Cache = new Cache();

				if ($Cache->pageCacheIsApproved()) {
					return $Cache->readPageFromCache();
				}

				$Feed = new Feed(
					$Cache->getAutomad(),
					Parse::csv(AM_FEED_FIELDS)
				);

				return $Feed->get();
			},
			AM_FEED_ENABLED
		);
	}


	/**
	 * Register all left-over routes as page routes.
	 *
	 * @param Router $Router
	 */
	private static function registerPageRoutes(Router $Router): void
	{
		$Router->register(
			'/.*',
			array(PageController::class, 'render')
		);
	}
}
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