import { ICustomer } from '../types/CustomerTypes';
import { EntityType } from '../types/CalendarTypes';
import { IApiRepository } from './IApiRepository';

interface RawCustomerData {
  id: string;
  name: string;
  phone: string;
  email?: string;
  metadata?: Record<string, any>;
  [key: string]: unknown;
}

/**
 * MockCustomerRepository - Loads customer data from local JSON file
 *
 * This repository implementation fetches mock customer data from a static JSON file.
 * Used for development and testing instead of API calls.
 *
 * Data Source: data/mock-customers.json
 *
 * NOTE: Create/Update/Delete operations are not supported - throws errors.
 * Only fetchAll() is implemented for loading initial mock data.
 */
export class MockCustomerRepository implements IApiRepository<ICustomer> {
  public readonly entityType: EntityType = 'Customer';
  private readonly dataUrl = 'data/mock-customers.json';

  /**
   * Fetch all customers from mock JSON file
   */
  public async fetchAll(): Promise<ICustomer[]> {
    try {
      const response = await fetch(this.dataUrl);

      if (!response.ok) {
        throw new Error(`Failed to load mock customers: ${response.status} ${response.statusText}`);
      }

      const rawData: RawCustomerData[] = await response.json();

      return this.processCustomerData(rawData);
    } catch (error) {
      console.error('Failed to load customer data:', error);
      throw error;
    }
  }

  /**
   * NOT SUPPORTED - MockCustomerRepository is read-only
   */
  public async sendCreate(customer: ICustomer): Promise<ICustomer> {
    throw new Error('MockCustomerRepository does not support sendCreate. Mock data is read-only.');
  }

  /**
   * NOT SUPPORTED - MockCustomerRepository is read-only
   */
  public async sendUpdate(id: string, updates: Partial<ICustomer>): Promise<ICustomer> {
    throw new Error('MockCustomerRepository does not support sendUpdate. Mock data is read-only.');
  }

  /**
   * NOT SUPPORTED - MockCustomerRepository is read-only
   */
  public async sendDelete(id: string): Promise<void> {
    throw new Error('MockCustomerRepository does not support sendDelete. Mock data is read-only.');
  }

  private processCustomerData(data: RawCustomerData[]): ICustomer[] {
    return data.map((customer): ICustomer => ({
      ...customer,
      syncStatus: 'synced' as const
    }));
  }
}