/**
 * 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 Roc {
  roc?: number;
  maRoc?: number;
}

/**
 * 变动率指标
 * 公式：ROC = (CLOSE - REF(CLOSE, N)) / REF(CLOSE, N)
 */
const rateOfChange: IndicatorTemplate<Roc> = {
  name: 'ROC',
  shortName: 'ROC',
  calcParams: [12, 6],
  figures: [
    { key: 'roc', title: 'ROC: ', type: 'line' },
    { key: 'maRoc', title: 'MAROC: ', type: 'line' },
  ],
  calc: (dataList: TViewData[], indicator: Indicator<Roc>) => {
    const params = indicator.calcParams as number[];
    const result: Roc[] = [];
    let rocSum = 0;
    dataList.forEach((TViewData: TViewData, i: number) => {
      const roc: Roc = {};
      if (i >= params[0] - 1) {
        const close = TViewData.close;
        const agoClose = (
          dataList[i - params[0]] ?? dataList[i - (params[0] - 1)]
        ).close;
        if (agoClose !== 0) {
          roc.roc = ((close - agoClose) / agoClose) * 100;
        } else {
          roc.roc = 0;
        }
        rocSum += roc.roc;
        if (i >= params[0] - 1 + params[1] - 1) {
          roc.maRoc = rocSum / params[1];
          rocSum -= result[i - (params[1] - 1)].roc ?? 0;
        }
      }
      result.push(roc);
    });
    return result;
  },
};

export default rateOfChange;