import axios from 'axios';

class HttpRequest {
  constructor(options) {
    this.options = options;
    this.queues = {};
  }

  getInsideConfig() {
    let headers = {};
    if (this.options.headers instanceof Function) {
      headers = this.options.headers();
    } else {
      headers = { ...this.options.headers };
    }
    const config = {
      baseURL: this.options.baseUrl, // baseURL
      timeout: 10000,
      responseType: 'json',
      withCredentials: false, // default
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Content-Type': 'application/json',
        Accept: 'application/json',
        'X-Requested-With': 'XMLHttpRequest',
        ...headers,
      },
    };
    return config;
  }

  destroy(url) {
    delete this.queues[url];
  }

  interceptors(instance, url, options) {
    // 请求拦截
    instance.interceptors.request.use(
      config => {
        this.queues[url] = true;
        if (options.beforeRequest instanceof Function) {
          options.beforeRequest({ queues: this.queues, config, options });
        }
        return config;
      },
      error => Promise.reject(error),
    );
    // 响应拦截
    instance.interceptors.response.use(
      res => {
        // success
        this.destroy(url);
        if (options.successHandler instanceof Function) {
          options.successHandler({ queues: this.queues, res, options });
        }
        const { data, status } = res;
        return { data, status };
      },
      error => {
        // error
        this.destroy(url);
        if (options.errorHandler instanceof Function) {
          options.errorHandler({ queues: this.queues, error, options });
        }
        return Promise.reject(error);
      },
    );
  }

  request(options) {
    const instance = axios.create();
    const ops = Object.assign(this.getInsideConfig(), options);
    this.interceptors(instance, ops.url, ops);
    return instance(ops);
  }
}
export default HttpRequest;