/**
 * 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 Trix {
  trix?: number;
  maTrix?: number;
}

/**
 * trix
 *
 * TR=收盘价的N日指数移动平均的N日指数移动平均的N日指数移动平均；
 * TRIX=(TR-昨日TR)/昨日TR*100；
 * MATRIX=TRIX的M日简单移动平均；
 * 默认参数N设为12，默认参数M设为9；
 * 默认参数12、9
 * 公式：MTR:=EMA(EMA(EMA(CLOSE,N),N),N)
 * TRIX:(MTR-REF(MTR,1))/REF(MTR,1)*100;
 * TRMA:MA(TRIX,M)
 *
 */
const tripleExponentiallySmoothedAverage: IndicatorTemplate<Trix> = {
  name: 'TRIX',
  shortName: 'TRIX',
  calcParams: [12, 9],
  figures: [
    { key: 'trix', title: 'TRIX: ', type: 'line' },
    { key: 'maTrix', title: 'MATRIX: ', type: 'line' },
  ],
  calc: (dataList: TViewData[], indicator: Indicator<Trix>) => {
    const params = indicator.calcParams as number[];
    let closeSum = 0;
    let ema1: number;
    let ema2: number;
    let oldTr: number;
    let ema1Sum = 0;
    let ema2Sum = 0;
    let trixSum = 0;
    const result: Trix[] = [];
    dataList.forEach((TViewData: TViewData, i: number) => {
      const trix: Trix = {};
      const close = TViewData.close;
      closeSum += close;
      if (i >= params[0] - 1) {
        if (i > params[0] - 1) {
          ema1 = (2 * close + (params[0] - 1) * ema1) / (params[0] + 1);
        } else {
          ema1 = closeSum / params[0];
        }
        ema1Sum += ema1;
        if (i >= params[0] * 2 - 2) {
          if (i > params[0] * 2 - 2) {
            ema2 = (2 * ema1 + (params[0] - 1) * ema2) / (params[0] + 1);
          } else {
            ema2 = ema1Sum / params[0];
          }
          ema2Sum += ema2;
          if (i >= params[0] * 3 - 3) {
            let tr: number;
            let trixValue = 0;
            if (i > params[0] * 3 - 3) {
              tr = (2 * ema2 + (params[0] - 1) * oldTr) / (params[0] + 1);
              trixValue = ((tr - oldTr) / oldTr) * 100;
            } else {
              tr = ema2Sum / params[0];
            }
            oldTr = tr;
            trix.trix = trixValue;
            trixSum += trixValue;
            if (i >= params[0] * 3 + params[1] - 4) {
              trix.maTrix = trixSum / params[1];
              trixSum -= result[i - (params[1] - 1)].trix ?? 0;
            }
          }
        }
      }
      result.push(trix);
    });
    return result;
  },
};

export default tripleExponentiallySmoothedAverage;