/**
 * @fileoverview Main application entry point
 * @version 2.1.0
 * @requirementsTraceability {@link Requirements.REQ_ARCH_001} - Main application initialization and component orchestration
 * @requirementsTraceability {@link Requirements.REQ_ARCH_002} - Service layer integration and dependency management
 * @requirementsTraceability {@link Requirements.REQ_UI_001} - Application UI initialization and component mounting
 * @requirementsTraceability {@link Requirements.REQ_UI_002} - Tour system integration for user onboarding
 */

import { AuthManager } from './components/AuthManager';
import { Dashboard } from './components/Dashboard';
import { QuizContent } from './components/quiz/QuizContent';
import { QuizList } from './components/QuizList';
import { ResultsModal } from './components/ResultsModal';
import { SettingsMenu } from './components/SettingsMenu';
import { SidebarToggle } from './components/SidebarToggle';
import { ThemeSelector } from './components/ThemeSelector';
import { TourModal } from './components/TourModal';
import { SettingsService } from './services/SettingsService';
import { ThemeService } from './services/ThemeService';
import { TimerService } from './services/TimerService';
import { TourService } from './services/TourService';
import { AppStore } from './store/AppStore';
import { DOMUtils } from './utils/index';

class QuizApp {
  private store: AppStore;
  private themeService: ThemeService;
  private settingsService: SettingsService;
  private timerService: TimerService;
  private tourService: TourService;
  private components: {
    authManager: AuthManager;
    dashboard?: Dashboard;
    quizList: QuizList;
    quizContent: QuizContent;
    themeSelector: ThemeSelector;
    resultsModal: ResultsModal;
    settingsMenu: SettingsMenu;
    sidebarToggle: SidebarToggle;
    tourModal: TourModal;
  };

  constructor() {
    this.store = AppStore.getInstance();
    this.themeService = ThemeService.getInstance();
    this.settingsService = SettingsService.getInstance();
    this.timerService = TimerService.getInstance();
    this.tourService = TourService.getInstance();

    this.components = {
      authManager: AuthManager.getInstance(),
      quizList: new QuizList(),
      quizContent: new QuizContent(),
      themeSelector: new ThemeSelector(),
      resultsModal: new ResultsModal(),
      settingsMenu: new SettingsMenu(),
      sidebarToggle: new SidebarToggle(),
      tourModal: new TourModal(),
    };
  }

  async initialize(): Promise<void> {
    try {
      // Initialize theme first
      this.themeService.initialize();

      // Mount all components
      Object.values(this.components).forEach(component => {
        component.mount();
      });

      // Load initial data
      await this.store.loadQuizzes();

      // Initialize tour system (after components are mounted)
      this.initializeTourSystem();

      // Set up global error handling
      this.setupErrorHandling();

      console.log('✅ Quiz Platform initialized successfully');
    } catch (error) {
      console.error('❌ Failed to initialize Quiz Platform:', error);
      DOMUtils.showToast('Failed to initialize application', 'error');
    }
  }

  /**
   * @description Initializes the tour system and shows welcome tour for first-time users
   */
  private initializeTourSystem(): void {
    try {
      // Add tour trigger attributes to elements for targeting
      this.addTourAttributes();

      // Check if user should see welcome tour
      if (this.tourService.shouldShowWelcomeTour()) {
        // Delay tour start slightly to ensure all components are fully rendered
        setTimeout(() => {
          console.log('🎯 Starting welcome tour for first-time user');
          this.tourService.startTour('welcome');
        }, 1500);
      }

      // Add tour trigger to settings menu
      this.addTourTriggers();

      console.log('✨ Tour system initialized successfully');
    } catch (error) {
      console.error('❌ Failed to initialize tour system:', error);
    }
  }

  /**
   * @description Adds tour-specific data attributes to elements for targeting
   */
  private addTourAttributes(): void {
    // Add tour attributes to key elements
    const settingsBtn = document.querySelector('#settings-btn, [data-settings-trigger]');
    if (settingsBtn) {
      settingsBtn.setAttribute('data-tour', 'settings-button');
    }

    const timerToggle = document.querySelector('#timer-toggle');
    if (timerToggle) {
      timerToggle.setAttribute('data-tour', 'timer-toggle');
    }

    const viewToggle = document.querySelector('#view-mode-toggle, [data-view-toggle]');
    if (viewToggle) {
      viewToggle.setAttribute('data-tour', 'view-toggle');
    }

    const navButtons = document.querySelector('.nav-buttons, #navigation-buttons');
    if (navButtons) {
      navButtons.setAttribute('data-tour', 'navigation-buttons');
    }
  }

  /**
   * @description Adds tour trigger buttons to UI
   */
  private addTourTriggers(): void {
    // Add "Help & Tour" option to settings menu
    const settingsMenu = document.querySelector('#settings-dropdown');
    if (settingsMenu) {
      const tourButton = document.createElement('button');
      tourButton.className =
        'tour-trigger-btn w-full text-left px-4 py-2 text-sm text-surface-700 dark:text-surface-300 hover:bg-surface-100 dark:hover:bg-surface-600 flex items-center gap-2';
      tourButton.innerHTML = `
        <i data-lucide="help-circle" class="w-4 h-4"></i>
        <span>Take Tour</span>
      `;

      tourButton.addEventListener('click', () => {
        console.log('🎯 User requested tour');
        this.tourService.startTour('welcome');
      });

      // Insert before the last item (usually theme selector)
      const lastItem = settingsMenu.querySelector(':scope > :last-child');
      if (lastItem) {
        settingsMenu.insertBefore(tourButton, lastItem);
      } else {
        settingsMenu.appendChild(tourButton);
      }

      // Re-initialize Lucide icons for the new button
      if (typeof (window as any).lucide !== 'undefined') {
        (window as any).lucide.createIcons();
      }
    }
  }

  private setupErrorHandling(): void {
    window.addEventListener('error', event => {
      console.error('Global error:', event.error);
      DOMUtils.showToast('An unexpected error occurred', 'error');
    });

    window.addEventListener('unhandledrejection', event => {
      console.error('Unhandled promise rejection:', event.reason);
      DOMUtils.showToast('An unexpected error occurred', 'error');
    });
  }

  // Getter methods for debugging and external access
  getSettingsService(): SettingsService {
    return this.settingsService;
  }

  getStore(): AppStore {
    return this.store;
  }

  getComponents() {
    return this.components;
  }

  destroy(): void {
    Object.values(this.components).forEach(component => {
      component?.unmount();
    });
  }
}

/**
 * Initialize dashboard application
 *
 * @description Specialized initialization for dashboard page
 *
 * @returns {Promise<void>}
 *
 * @since 2025-08-04
 * @author Claude Code Agent
 */
export async function initializeDashboard(): Promise<void> {
  try {
    console.log('🚀 Initializing Dashboard Application...');

    // Initialize core services
    const store = AppStore.getInstance();
    const themeService = ThemeService.getInstance();
    const settingsService = SettingsService.getInstance();

    // Apply saved theme
    await themeService.initialize();

    // Initialize dashboard component
    const dashboard = new Dashboard();
    await dashboard.mount();

    console.log('✅ Dashboard Application initialized successfully');

    // Make available globally for debugging
    (window as any).__dashboard = dashboard;
    (window as any).__store = store;
  } catch (error) {
    console.error('❌ Dashboard initialization failed:', error);
    throw error;
  }
}

// Initialize the standard quiz application when DOM is ready
document.addEventListener('DOMContentLoaded', async () => {
  // Only initialize standard app if not on dashboard page
  if (!window.location.pathname.includes('/dashboard')) {
    const app = new QuizApp();
    await app.initialize();

    // Make app available globally for debugging
    (window as any).__quizApp = app;
  }
});

export default QuizApp;