/**
 * 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 Sma {
  sma?: number;
}

/**
 * sma
 */
const simpleMovingAverage: IndicatorTemplate<Sma> = {
  name: 'SMA',
  shortName: 'SMA',
  series: IndicatorSeries.Price,
  calcParams: [12, 2],
  precision: 2,
  figures: [{ key: 'sma', title: 'SMA: ', type: 'line' }],
  shouldOhlc: true,
  calc: (dataList: TViewData[], indicator: Indicator<Sma>) => {
    const params = indicator.calcParams as number[];
    let closeSum = 0;
    let smaValue = 0;
    return dataList.map((TViewData: TViewData, i: number) => {
      const sma: Sma = {};
      const close = TViewData.close;
      closeSum += close;
      if (i >= params[0] - 1) {
        if (i > params[0] - 1) {
          smaValue =
            (close * params[1] + smaValue * (params[0] - params[1] + 1)) /
            (params[0] + 1);
        } else {
          smaValue = closeSum / params[0];
        }
        sma.sma = smaValue;
      }
      return sma;
    });
  },
};

export default simpleMovingAverage;