import { ICalendarEvent } from '../types/CalendarTypes';
import { Configuration } from '../configurations/CalendarConfig';

/**
 * ApiEventRepository
 * Handles communication with backend API
 *
 * Used by SyncManager to send queued operations to the server
 * NOT used directly by EventManager (which uses IndexedDBEventRepository)
 *
 * Future enhancements:
 * - SignalR real-time updates
 * - Conflict resolution
 * - Batch operations
 */
export class ApiEventRepository {
  private apiEndpoint: string;

  constructor(config: Configuration) {
    this.apiEndpoint = config.apiEndpoint;
  }

  /**
   * Send create operation to API
   */
  async sendCreate(event: ICalendarEvent): Promise<ICalendarEvent> {
    // TODO: Implement API call
    // const response = await fetch(`${this.apiEndpoint}/events`, {
    //   method: 'POST',
    //   headers: { 'Content-Type': 'application/json' },
    //   body: JSON.stringify(event)
    // });
    //
    // if (!response.ok) {
    //   throw new Error(`API create failed: ${response.statusText}`);
    // }
    //
    // return await response.json();

    throw new Error('ApiEventRepository.sendCreate not implemented yet');
  }

  /**
   * Send update operation to API
   */
  async sendUpdate(id: string, updates: Partial<ICalendarEvent>): Promise<ICalendarEvent> {
    // TODO: Implement API call
    // const response = await fetch(`${this.apiEndpoint}/events/${id}`, {
    //   method: 'PATCH',
    //   headers: { 'Content-Type': 'application/json' },
    //   body: JSON.stringify(updates)
    // });
    //
    // if (!response.ok) {
    //   throw new Error(`API update failed: ${response.statusText}`);
    // }
    //
    // return await response.json();

    throw new Error('ApiEventRepository.sendUpdate not implemented yet');
  }

  /**
   * Send delete operation to API
   */
  async sendDelete(id: string): Promise<void> {
    // TODO: Implement API call
    // const response = await fetch(`${this.apiEndpoint}/events/${id}`, {
    //   method: 'DELETE'
    // });
    //
    // if (!response.ok) {
    //   throw new Error(`API delete failed: ${response.statusText}`);
    // }

    throw new Error('ApiEventRepository.sendDelete not implemented yet');
  }

  /**
   * Fetch all events from API
   */
  async fetchAll(): Promise<ICalendarEvent[]> {
    // TODO: Implement API call
    // const response = await fetch(`${this.apiEndpoint}/events`);
    //
    // if (!response.ok) {
    //   throw new Error(`API fetch failed: ${response.statusText}`);
    // }
    //
    // return await response.json();

    throw new Error('ApiEventRepository.fetchAll not implemented yet');
  }

  // ========================================
  // Future: SignalR Integration
  // ========================================

  /**
   * Initialize SignalR connection
   * Placeholder for future implementation
   */
  async initializeSignalR(): Promise<void> {
    // TODO: Setup SignalR connection
    // - Connect to hub
    // - Register event handlers
    // - Handle reconnection
    //
    // Example:
    // const connection = new signalR.HubConnectionBuilder()
    //   .withUrl(`${this.apiEndpoint}/hubs/calendar`)
    //   .build();
    //
    // connection.on('EventCreated', (event: ICalendarEvent) => {
    //   // Handle remote create
    // });
    //
    // connection.on('EventUpdated', (event: ICalendarEvent) => {
    //   // Handle remote update
    // });
    //
    // connection.on('EventDeleted', (eventId: string) => {
    //   // Handle remote delete
    // });
    //
    // await connection.start();

    throw new Error('SignalR not implemented yet');
  }
}