import { Injectable } from '@angular/core';
import {
  HttpClient, HttpInterceptor, HttpHandler, HttpRequest,
  HttpErrorResponse
} from '@angular/common/http';
import { throwError } from 'rxjs'
import { catchError } from 'rxjs/operators';
import { Router } from '@angular/router'
import { CacheTokenService } from '../service/cache-token.service'
import { NzMessageService } from 'ng-zorro-antd/message';
//baseurl
// const baseurl = 'http://39.106.78.171:8008';

@Injectable()
export class BaseInterceptor implements HttpInterceptor {

  constructor(private router: Router, public token: CacheTokenService, private message: NzMessageService) { }

  intercept(req: any, next: HttpHandler) {

    let params = req.params;
    for (const key of req.params.keys()) {
      if (params.get(key) === undefined || params.get(key) === null) {
        params = params.delete(key, undefined);
      }
    }
    req = req.clone({ params });
    // debugger
    //     console.log('xxxxxx',req)
    let newReq = req.clone({
      url: req.hadBaseurl ? `${req.url}` : `${req.url}`,
    });
    if (!req.cancelToken) {
      /*获取token*/
      let token = sessionStorage.getItem('token')
      /*此处设置额外请求头，token令牌*/
      newReq.headers =
        newReq.headers.set('Authorization', `Bearer ${token}`)
    }

    // 携带请求头发送下一次请求
    return next.handle(newReq)
      .pipe(
        //箭头函数,注意this指向
        catchError((err) => this.handleError(err))
      )
  }

  // 捕获错误  
  //401 token过期   403没权限!!!   400参数错误   404未找到   614刷新令牌过期!!!

  private handleError(error: HttpErrorResponse) {
    console.log('http错误', error)
    // 用户认证失败返回登录页
    if (error.status === 401 || error.status === 614) {
      this.token.delete()
      sessionStorage.clear()
      localStorage.removeItem("isautologin")
      this.message.create('error', `用户认证信息过期,请重新登录!`);
      this.router.navigate(['/login'])
    }
    if (error.status === 403) {
      this.message.create('error', `对不起,您无此权限!`);
    }
    if (error.status === 400) {
      this.message.create('error', `请核对您的输入信息或格式是否正确!`);
    }

    if (error.error instanceof ErrorEvent) {
      // 发生客户端或网络错误。相应处理。
      console.error('An error occurred:', error.error.message);
    } else {
      // 服务端返回http状态码
      // 服务端返回错误信息
      console.error(
        `Backend returned code ${error.status}, ` +
        `body was: ${error.error}`);
    }
    // 返回带有面向用户的错误信息
    return throwError(
      error);
  };
}