import { IEventBus } from '../types/CalendarTypes';
import { EventManager } from '../managers/EventManager';
import { EventRenderingService } from '../renderers/EventRendererManager';
import { GridManager } from '../managers/GridManager';
import { ScrollManager } from '../managers/ScrollManager';
import { NavigationManager } from '../managers/NavigationManager';
import { ViewManager } from '../managers/ViewManager';
import { CalendarManager } from '../managers/CalendarManager';
import { DragDropManager } from '../managers/DragDropManager';
import { AllDayManager } from '../managers/AllDayManager';
import { CalendarManagers } from '../types/ManagerTypes';

/**
 * Factory for creating and managing calendar managers with proper dependency injection
 */
export class ManagerFactory {
  private static instance: ManagerFactory;
  
  private constructor() {}
  
  public static getInstance(): ManagerFactory {
    if (!ManagerFactory.instance) {
      ManagerFactory.instance = new ManagerFactory();
    }
    return ManagerFactory.instance;
  }

  /**
   * Create all managers with proper dependency injection
   */
  public createManagers(eventBus: IEventBus): CalendarManagers {
    
    // Create managers in dependency order
    const eventManager = new EventManager(eventBus);
    const eventRenderer = new EventRenderingService(eventBus, eventManager);
    const gridManager = new GridManager();
    const scrollManager = new ScrollManager();
    const navigationManager = new NavigationManager(eventBus, eventRenderer);
    const viewManager = new ViewManager(eventBus);
    const dragDropManager = new DragDropManager(eventBus);
    const allDayManager = new AllDayManager();
    
    // CalendarManager depends on all other managers
    const calendarManager = new CalendarManager(
      eventBus,
      eventManager,
      gridManager,
      eventRenderer,
      scrollManager
    );

    
    return {
      eventManager,
      eventRenderer,
      gridManager,
      scrollManager,
      navigationManager,
      viewManager,
      calendarManager,
      dragDropManager,
      allDayManager
    };
  }

  /**
   * Initialize all managers in the correct order
   */
  public async initializeManagers(managers: CalendarManagers): Promise<void> {
    
    try {
      await managers.calendarManager.initialize?.();
    } catch (error) {
      throw error;
    }
  }
}