import { IResource, ResourceType } from '../types/ResourceTypes';
import { EntityType } from '../types/CalendarTypes';
import { IApiRepository } from './IApiRepository';

interface RawResourceData {
  id: string;
  name: string;
  displayName: string;
  type: string;
  avatarUrl?: string;
  color?: string;
  isActive?: boolean;
  metadata?: Record<string, any>;
  [key: string]: unknown;
}

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

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

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

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

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

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

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

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

  private processResourceData(data: RawResourceData[]): IResource[] {
    return data.map((resource): IResource => ({
      ...resource,
      type: resource.type as ResourceType,
      syncStatus: 'synced' as const
    }));
  }
}