function Datafeed(vue) {
  this.vue = vue;
}

Datafeed.prototype.onReady = function(callback) {
  setTimeout(() => {
    callback({
      // exchanges: [
      //   // 交易所数组
      //   {value: '火币网', name: '火币网', desc: ''},
      //   {value: '博客卫得', name: '博客卫得', desc: ''},
      // ],
      // symbols_types: [
      //   // 商品类型过滤器数组
      //   {name: 'USDT', value: 'USDT'},
      //   {name: 'BTC', value: 'BTC'},
      //   {name: 'ETH', value: 'ETH'},
      // ],
      supports_search: false,
      supports_group_request: true,
      supported_resolutions: [1, 5, 15, 30, 60, 240, 720, 'D', '2D', 'W', 'M'],
      supports_marks: true,
      supports_timescale_marks: true,
      supports_time: true,
    });
  }, 500);
};

Datafeed.prototype.searchSymbols = function(
  userInput,
  exchange,
  symbolType,
  onResultReadyCallback
) {};

Datafeed.prototype.resolveSymbol = function(
  symbolName,
  onSymbolResolvedCallback,
  onResolveErrorCallback
) {
  new Promise(() => {
    setTimeout(() => {
      onSymbolResolvedCallback(this.vue.billinfo());
    }, 500);
  });
};

Datafeed.prototype.getBars = function(
  symbolInfo,
  resolution,
  from,
  to,
  onHistoryCallback,
  onErrorCallback,
  firstDataRequest
) {
  this.vue.interval = resolution;
  const onDataCallback = data => {
    if (data && data.length) {
      onHistoryCallback(data, {noData: false});
    } else {
      onHistoryCallback([], {noData: true});
    }
  };
  this.vue.getBars(
    symbolInfo,
    resolution,
    from,
    to,
    onHistoryCallback,
    onDataCallback
  );
};

Datafeed.prototype.subscribeBars = function(
  symbolInfo,
  resolution,
  onRealtimeCallback,
  subscriberUID,
  onResetCacheNeededCallback
) {
  this.vue.subscribeBars(onRealtimeCallback);
};

Datafeed.prototype.unsubscribeBars = function(subscriberUID) {
  // clearInterval(this.vue.subInterval);
};

Datafeed.prototype.calculateHistoryDepth = function(
  resolution,
  resolutionBack,
  intervalBack
) {
  localStorage.setItem('resolution', resolution);
  return {
    resolutionBack: 'M',
    intervalBack: 24,
  };
};

Datafeed.prototype.getMarks = function(
  symbolInfo,
  startDate,
  endDate,
  onDataCallback,
  resolution
) {};

Datafeed.prototype.getTimescaleMarks = function(
  symbolInfo,
  startDate,
  endDate,
  onDataCallback,
  resolution
) {};

Datafeed.prototype.getServerTime = function(callback) {};

// export default Datafeed;