import {Injectable} from '@angular/core';
import {
  HttpClient,
  HttpHeaders
} from '@angular/common/http';

@Injectable({
  providedIn: 'root'
})

/**
 * @date 2019-04-01
 * @description http请求客户端服务
 */
export default class HttpServe {

  constructor(
    private http: HttpClient
  ) {
  }

  /**
   * 处理数据请求
   * @param result 数据请求返回数据
   * @param success 成功数据回调
   * @param fail 失败数据请求
   */
  private formatData(result: any, success: any, fail: any) {
    const {status, message, datas} = result;
    if (status === 200) {
      success && success(datas);
      return;
    }
    fail && fail(false);
    console.log(message || '服务异常，请联系管理员');
  }

  /**
   * 配置数据请求头部
   * @param type 后端数据接受格式
   * @param param get请求数据
   */
  private setHttpInfo(type: number = 0, param: any = null): any {
    // 数据上送格式类型
    const contentType = ['application/json;charset=UTF-8', 'multipart/form-data'];
    // 获取本地token
    const token = localStorage.getItem('token');
    return {
      param,
      headers: new HttpHeaders({
        'Content-Type': contentType[type],
        'Authorization': token || ''
      })
    };
  }

  /**
   * Post数据请求
   * @param data 请求数据
   * @param url 请求数据地址
   * @param success 请求成功回调函数
   * @param fail 失败数据回调函数
   */
  post(url: string, data: any, success: any = null, fail: any = null): void {
    this.http.post<any>(url, data, this.setHttpInfo()).subscribe((data: any) => (this.formatData(data, success, fail)));
  }

  /**
   * 上传文件
   * @param {FormData} data 请求数据
   * @param url 请求数据地址
   * @param success 请求成功回调函数
   * @param fail 失败数据回调函数
   */
  file(url: string, data: FormData, success: any = null, fail: any = null): void {
    this.http.post<any>(url, data, this.setHttpInfo(1)).subscribe((data: any) => (this.formatData(data, success, fail)));
  }

  /**
   * patch数据请求
   * @param data 请求数据
   * @param url 请求数据地址
   * @param success 请求成功回调函数
   * @param fail 失败数据回调函数
   */
  patch(url: string, data: any, success: any = null, fail: any = null): void {
    this.http.patch<any>(url, data, this.setHttpInfo()).subscribe((data: any) => (this.formatData(data, success, fail)));
  }

  /**
   * delete数据请求
   * @param data 请求数据
   * @param url 请求数据地址
   * @param success 请求成功回调函数
   * @param fail 失败数据回调函数
   */
  delete(url: string, data: any = null, success: any = null, fail: any = null): void {
    this.http.delete<any>(url, this.setHttpInfo(0, data)).subscribe((data: any) => (this.formatData(data, success, fail)));
  }

  /**
   * get数据请求
   * @param url 请求数据地址
   * @param param 请求参数
   * @param success 成功回调
   * @param fail 失败回调
   */
  get(url: string, param: any, success: any = null, fail: any = null): void {
    this.http.get(url, this.setHttpInfo(0, param)).subscribe((data: any) => (this.formatData(data, success, fail)));
  }

  /**
   * @method Promise数据请求
   * @param url 数据请求地址
   * @param data 请求参数
   * @param method 请求方法 get、 post、 patch、 delete
   */
  async promise(url: string, data: any = null, method = 'get'): Promise<any> {
    switch (method) {
      case 'post':
        return await (new Promise((resolve) => (this.post(url, data, resolve, resolve))));
      case 'get':
        return await (new Promise((resolve) => (this.get(url, data, resolve, resolve))));
      case 'delete':
        return await (new Promise((resolve) => (this.delete(url, data, resolve, resolve))));
      case 'patch':
        return await (new Promise((resolve) => (this.patch(url, data, resolve, resolve))));

    }
  }

  /**
   * promiseAll 数据请求
   * @param list 请求配置数据类型为{method:get||post||delete||file||patch,data:any,url:string}
   */
  async promiseAll(list: any = []) {
    if (list.length < 2) {
      console.log('数据请求配置数组长度应大于1');
      return false;
    }
    const sendList: any = [];
    list.map((item: any) => (sendList.push(this.promise(item.url, item.data || null, item.method || 'get'))));
    return await (Promise.all(sendList));
  }
}

/**亲测可用*/