import { HttpClient } from '@angular/common/http';
import { Injectable, inject } from '@angular/core';
import { Observable } from 'rxjs';
import {
  AddListTemplateItemRequest,
  CreateListFromTemplateRequest,
  CreateListTemplateRequest,
  ListTemplate,
  ReorderListTemplateItemsRequest,
  UpdateListTemplateRequest,
  UserList,
} from './templates.models';

@Injectable({ providedIn: 'root' })
export class TemplatesService {
  private readonly http = inject(HttpClient);
  private readonly apiUrl = '/api/list-templates';

  listTemplates(): Observable<ListTemplate[]> {
    return this.http.get<ListTemplate[]>(this.apiUrl);
  }

  getTemplate(templateId: string): Observable<ListTemplate> {
    return this.http.get<ListTemplate>(`${this.apiUrl}/${templateId}`);
  }

  createTemplate(data: CreateListTemplateRequest): Observable<ListTemplate> {
    return this.http.post<ListTemplate>(this.apiUrl, data);
  }

  updateTemplate(
    templateId: string,
    data: UpdateListTemplateRequest,
  ): Observable<ListTemplate> {
    return this.http.patch<ListTemplate>(`${this.apiUrl}/${templateId}`, data);
  }

  deleteTemplate(templateId: string): Observable<{ message: string }> {
    return this.http.delete<{ message: string }>(`${this.apiUrl}/${templateId}`);
  }

  shareTemplate(templateId: string, userId: string): Observable<ListTemplate> {
    return this.http.post<ListTemplate>(`${this.apiUrl}/${templateId}/shares`, {
      userId,
    });
  }

  removeShare(templateId: string, userId: string): Observable<ListTemplate> {
    return this.http.delete<ListTemplate>(
      `${this.apiUrl}/${templateId}/shares/${userId}`,
    );
  }

  createListFromTemplate(
    templateId: string,
    data: CreateListFromTemplateRequest = {},
  ): Observable<UserList> {
    return this.http.post<UserList>(`${this.apiUrl}/${templateId}/lists`, data);
  }

  addItem(
    templateId: string,
    data: AddListTemplateItemRequest,
  ): Observable<ListTemplate> {
    return this.http.post<ListTemplate>(`${this.apiUrl}/${templateId}/items`, data);
  }

  deleteItem(templateId: string, itemId: string): Observable<ListTemplate> {
    return this.http.delete<ListTemplate>(
      `${this.apiUrl}/${templateId}/items/${itemId}`,
    );
  }

  reorderItems(
    templateId: string,
    data: ReorderListTemplateItemsRequest,
  ): Observable<ListTemplate> {
    return this.http.patch<ListTemplate>(
      `${this.apiUrl}/${templateId}/items/order`,
      data,
    );
  }
}