/**
 * 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,
} from '../../component/Indicator';

interface Vr {
  vr?: number;
  maVr?: number;
}

/**
 * VR
 * VR=（UVS+1/2PVS）/（DVS+1/2PVS）
 * 24天以来凡是股价上涨那一天的成交量都称为AV，将24天内的AV总和相加后称为UVS
 * 24天以来凡是股价下跌那一天的成交量都称为BV，将24天内的BV总和相加后称为DVS
 * 24天以来凡是股价不涨不跌，则那一天的成交量都称为CV，将24天内的CV总和相加后称为PVS
 *
 */
const volumeRatio: IndicatorTemplate<Vr> = {
  name: 'VR',
  shortName: 'VR',
  calcParams: [26, 6],
  figures: [
    { key: 'vr', title: 'VR: ', type: 'line' },
    { key: 'maVr', title: 'MAVR: ', type: 'line' },
  ],
  calc: (dataList: TViewData[], indicator: Indicator<Vr>) => {
    const params = indicator.calcParams as number[];
    let uvs = 0;
    let dvs = 0;
    let pvs = 0;
    let vrSum = 0;
    const result: Vr[] = [];
    dataList.forEach((TViewData: TViewData, i: number) => {
      const vr: Vr = {};
      const close = TViewData.close;
      const preClose = (dataList[i - 1] ?? TViewData).close;
      const volume = TViewData.volume ?? 0;
      if (close > preClose) {
        uvs += volume;
      } else if (close < preClose) {
        dvs += volume;
      } else {
        pvs += volume;
      }
      if (i >= params[0] - 1) {
        const halfPvs = pvs / 2;
        if (dvs + halfPvs === 0) {
          vr.vr = 0;
        } else {
          vr.vr = ((uvs + halfPvs) / (dvs + halfPvs)) * 100;
        }
        vrSum += vr.vr;
        if (i >= params[0] + params[1] - 2) {
          vr.maVr = vrSum / params[1];
          vrSum -= result[i - (params[1] - 1)].vr ?? 0;
        }

        const agoData = dataList[i - (params[0] - 1)];
        const agoPreData = dataList[i - params[0]] ?? agoData;
        const agoClose = agoData.close;
        const agoVolume = agoData.volume ?? 0;
        if (agoClose > agoPreData.close) {
          uvs -= agoVolume;
        } else if (agoClose < agoPreData.close) {
          dvs -= agoVolume;
        } else {
          pvs -= agoVolume;
        }
      }
      result.push(vr);
    });
    return result;
  },
};

export default volumeRatio;