import { http } from '@kit.NetworkKit';
import { HttpInterceptor } from './HttpInterceptor';
import { ApiError } from './ApiError';

/**
 * HTTP 客户端封装：统一超时、请求头、拦截器链。
 * 基于 @kit.NetworkKit 的 http 模块（Promise 风格）。
 */
export class HttpClient {
  private readonly client: http.HttpRequest = http.createHttp();
  private interceptors: HttpInterceptor[] = [];

  addInterceptor(interceptor: HttpInterceptor): HttpClient {
    this.interceptors.push(interceptor);
    return this;
  }

  async get(url: string, header?: Record<string, string>): Promise<string> {
    return this.request(url, http.RequestMethod.GET, undefined, header);
  }

  async post(url: string, body: string, header?: Record<string, string>): Promise<string> {
    return this.request(url, http.RequestMethod.POST, body, header);
  }

  async put(url: string, body: string, header?: Record<string, string>): Promise<string> {
    return this.request(url, http.RequestMethod.PUT, body, header);
  }

  async delete(url: string, header?: Record<string, string>): Promise<string> {
    return this.request(url, http.RequestMethod.DELETE, undefined, header);
  }

  private async request(url: string, method: http.RequestMethod, body?: string,
    header?: Record<string, string>): Promise<string> {
    let headers: Record<string, string> = {};
    if (header !== undefined) {
      headers = header;
    }
    for (const interceptor of this.interceptors) {
      headers = interceptor.onRequest(headers);
    }

    const options: http.HttpRequestOptions = {
      method: method,
      header: headers,
      expectDataType: http.HttpDataType.STRING,
      connectTimeout: 10000,
      readTimeout: 10000
    };
    if (body !== undefined) {
      options.extraData = body;
    }

    try {
      const response: http.HttpResponse = await this.client.request(url, options);
      for (const interceptor of this.interceptors) {
        interceptor.onResponse(response.responseCode, response.result as string);
      }
      return response.result as string;
    } catch (err) {
      throw ApiError.network(JSON.stringify(err));
    }
  }
}