/**
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import type TViewData from '../../common/TViewData';
import {
  type Indicator,
  type IndicatorTemplate,
  IndicatorSeries,
} from '../../component/Indicator';

interface Bbi {
  bbi?: number;
}

/**
 * 多空指标
 * 公式: BBI = (MA(CLOSE, M) + MA(CLOSE, N) + MA(CLOSE, O) + MA(CLOSE, P)) / 4
 *
 */
const bullAndBearIndex: IndicatorTemplate<Bbi> = {
  name: 'BBI',
  shortName: 'BBI',
  series: IndicatorSeries.Price,
  precision: 2,
  calcParams: [3, 6, 12, 24],
  shouldOhlc: true,
  figures: [{ key: 'bbi', title: 'BBI: ', type: 'line' }],
  calc: (dataList: TViewData[], indicator: Indicator<Bbi>) => {
    const params = indicator.calcParams as number[];
    const maxPeriod = Math.max(...params);
    const closeSums: number[] = [];
    const mas: number[] = [];
    return dataList.map((TViewData: TViewData, i: number) => {
      const bbi: Bbi = {};
      const close = TViewData.close;
      params.forEach((p: number, index: number) => {
        closeSums[index] = (closeSums[index] ?? 0) + close;
        if (i >= p - 1) {
          mas[index] = closeSums[index] / p;
          closeSums[index] -= dataList[i - (p - 1)].close;
        }
      });
      if (i >= maxPeriod - 1) {
        let maSum = 0;
        mas.forEach((ma) => {
          maSum += ma;
        });
        bbi.bbi = maSum / 4;
      }
      return bbi;
    });
  },
};

export default bullAndBearIndex;