/**异常错误 */

import { innertEvent } from './utils'

class Error {
  constructor() {
    this.recordResourceError();
    this.recordJavaScriptError();
  }

  sendErrorStatic(typeName: string, sourceUrl: string) {
    innertEvent.trigger('errorStatic', {
      typeName: typeName,
      sourceUrl: sourceUrl
    });
  }

  sendErrorJs(origin_errorMsg:any, origin_errorObj:any) {
    const errorMsg = origin_errorMsg ? origin_errorMsg : '';
    const errorObj = origin_errorObj ? origin_errorObj : '';
    let errorType = "";
    if (errorMsg) {
      const errorStackStr = JSON.stringify(errorObj)
      errorType = errorStackStr.split(": ")[0].replace('"', "");
    }
    
    innertEvent.trigger('errorJs', {
      errorMsg: errorType + ": " + errorMsg,
      errorObj: errorObj.replace(/↵/g,'\n') 
    });
  }
  /**
   * 页面资静态源加载错误监控
   */
  recordResourceError() {
    const root = this;
    window.addEventListener('error',function(e: Event){
      const typeName = (e.target as any).localName;
      let sourceUrl = "";
      if (typeName === "link") {
        sourceUrl = (e.target as any).href;
      } else if (typeName === "script") {
        sourceUrl = (e.target as any).src;
      }
      if (typeName) {
        root.sendErrorStatic(typeName, sourceUrl)
      }
    }, true);
  }

  /**
   * 页面JS错误监控
   */
  recordJavaScriptError() {
    const root = this;
    let jsMonitorStarted = false;
    // 重写console.error, 可以捕获更全面的报错信息
    const oldError = console.error;
    console.error = function () {
      // arguments的长度为2时，才是error上报的时机
      // if (arguments.length < 2) return;
      const errorMsg = arguments[0] && arguments[0].message;
      let errorObj = arguments[0] && arguments[0].stack;
      if (!errorObj) {
        errorObj = arguments[0];
      }
      // 如果onerror重写成功，就无需在这里进行上报了
      !jsMonitorStarted && root.sendErrorJs(errorMsg, errorObj);
      return oldError.apply(console, arguments);
    };
    // 重写 onerror 进行jsError的监听
    window.onerror = function(errorMsg, url, lineNumber, columnNumber, errorObj)
    {
      //jsMonitorStarted = true;
      const errorStack = errorObj ? errorObj.stack as any : '';

      root.sendErrorJs(errorMsg, errorStack);
    };

  }
}

export default Error