<?php

declare(strict_types=1);

namespace App;

use Desktop\AppRegistry;
use Desktop\AppIconResolver;
use Desktop\AppVisibility;
use Desktop\DesktopState;
use Desktop\SkinResolver;
use Desktop\WidgetRegistry;
use Desktop\WindowManager;

final class App
{
    public function __construct(
        private readonly string $projectRoot,
    ) {
    }

    /**
     * @return array<string, mixed>
     */
    public function desktopPayload(): array
    {
        $keycloakConfig = ConfigLoader::load($this->projectRoot, 'keycloak');
        $auth = new KeycloakAuth($keycloakConfig);
        $registry = new AppRegistry($this->projectRoot . '/config/apps.php');
        $widgetRegistry = new WidgetRegistry($this->projectRoot . '/config/widgets.php');
        $skins = SkinResolver::all();
        $isAuthenticated = isset($_SESSION['desktop_auth']) && is_array($_SESSION['desktop_auth']);
        $authUser = $isAuthenticated && is_array($_SESSION['desktop_auth']['user'] ?? null)
            ? $_SESSION['desktop_auth']['user']
            : [];
        $authGroups = array_values(array_map('strval', (array) ($authUser['groups'] ?? [])));
        $visibleApps = AppVisibility::filterByGroups($registry->all(), $authGroups);
        $userSelfManagement = new UserSelfManagementService($this->projectRoot);
        $resolvedSkin = $userSelfManagement->resolveActiveSkin(
            isset($_GET['skin']) ? (string) $_GET['skin'] : null,
            $authUser,
            $visibleApps,
            $widgetRegistry->all(),
            $skins
        );
        $userSettings = $resolvedSkin['settings'];
        $activeSkin = (string) $resolvedSkin['skin'];
        $enabledApps = AppVisibility::filterByEnabledIds(
            $visibleApps,
            array_values(array_map('strval', (array) ($userSettings['apps']['enabled_ids'] ?? []))),
            [UserSelfManagementService::APP_ID]
        );
        $apps = AppIconResolver::decorate($enabledApps, $activeSkin);
        $windows = (new WindowManager($registry))->defaultWindows();
        $activeWidgetIds = array_values(array_map('strval', (array) ($userSettings['widgets']['active_ids'] ?? DesktopState::defaultWidgetIds())));
        $displayName = (string) ($authUser['name'] ?? $authUser['username'] ?? 'Gast');
        $storageScope = $isAuthenticated
            ? strtolower((string) ($authUser['username'] ?? $authUser['sub'] ?? 'user'))
            : 'guest';

        return [
            'meta' => [
                'title' => 'Kusche.Berlin Desktop UI',
                'active_skin' => $activeSkin,
                'available_skins' => $skins,
                'base_skin_profile' => SkinResolver::profile('base'),
                'skin_profile' => SkinResolver::profile($activeSkin),
            ],
            'desktop' => [
                'greeting' => 'Neue Desktop-Shell fuer Kusche.Berlin',
                'wallpaper' => SkinResolver::wallpaper($activeSkin),
                'storage_scope' => preg_replace('/[^a-z0-9._-]+/i', '-', $storageScope) ?: 'guest',
                'workspace' => DesktopState::defaultWorkspace(),
                'settings_api' => '/api/user-self-management/index.php',
                'user_preferences' => $userSettings,
                'login' => [
                    'authenticated' => $isAuthenticated,
                    'mode' => $isAuthenticated ? 'authenticated' : 'login-required',
                    'keycloak_theme_handoff' => '/docs/keycloak-theme-handoff.md',
                    'user' => [
                        'name' => (string) ($authUser['name'] ?? ''),
                        'username' => (string) ($authUser['username'] ?? ''),
                        'email' => (string) ($authUser['email'] ?? ''),
                    ],
                ],
            ],
            'apps' => $apps,
            'windows' => $windows,
            'widgets' => [
                'active' => $widgetRegistry->active($activeWidgetIds),
                'registry' => $widgetRegistry->all(),
                'active_ids' => $activeWidgetIds,
            ],
            'tray' => DesktopState::trayItems(),
            'session' => [
                'display_name' => $displayName,
                'authenticated' => $isAuthenticated,
                'logout_url' => $isAuthenticated && $auth->isConfigured() ? '/auth/logout' : null,
            ],
            'menu' => [
                'quick_actions' => DesktopState::quickActions(),
            ],
        ];
    }
}