import { Injectable } from '@angular/core';
import * as $ from 'jquery'
export interface AjaxSetting {
  url: string;
  data?: any;
  headers?: any;
  body?: any;
  method: string;
};


export interface CBparams {
  code: string;
  page: string;
  total: string;
  items: string;
  message?: string;
}



@Injectable()
export class AceTableService {

  constructor(
  ) {

  };
  private curAjax;

  toAjax({ url, setParams, cb, page, limit, cbParams }) {
    var parmams: any = setParams();
    if (!setParams) {
      throw new Error('ace-table params is undefined');
    }
 
    if (!parmams.method) {
      throw new Error('ace-table params method is undefined');
    };
    var self = this;
    if (parmams.url) {
      url = parmams.url;
    }
    var method = parmams.method.toLowerCase();
    var options: any = {
      url,
      type: method,
      dataType: 'json',
      data: parmams.data,

      success: function (res) {
        let code = deepTraversal(res, cbParams.code)
        let items = deepTraversal(res, cbParams.items);
        let page = deepTraversal(res, cbParams.page) - 0;
        let total = deepTraversal(res, cbParams.total) - 0;
        let msg = deepTraversal(res, cbParams.message)
        cb({
          code,
          items,
          page,
          total,
          msg,
          data: res
        })
      },
      error: function (err) {

        if (self.curAjax) {
          if (self.curAjax.statusText == 'abort') {

          } else {
            cb({
              code: err.status,
              msg: err,
              data: err
            })
          }
        } else {
          cb({
            code: err.status,
            msg: '请求失败'

          })
        }

      }
    };
    if(parmams.withCredentials){
      options.xhrFields = {
        withCredentials: true
      }
      options.crossDomain = true
    }
    if (parmams.headers) options.headers = parmams.headers;
    if (typeof parmams.data == 'string') {
      if (!options.headers['Content-Type']) {
        options.headers['Content-Type'] = 'application/json'
      }

    } else {
      parmams.data.pageNum = page;
      parmams.data.limit = limit;//改动
    }

    if (this.curAjax && this.curAjax.status != 200) {
      this.curAjax.abort();
    }
    this.curAjax = $.ajax(options);

  };



}

function deepTraversal(parentObj, key) {
  var findOut = false;
  var target = undefined;

  handle(parentObj);
  return target;
  function handle(obj) {
    if (findOut) return
    if (typeof obj == 'object') {
      for (var i in obj) {
        if (i == key) {
          target = obj[i];
          findOut = true;
        } else {
          if (typeof obj[i] == 'object')
            handle(obj[i]);
        }
      }
    }
  }


}