/**
 * 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 IndicatorStyle, PolygonType } from '../../common/Styles';
import { formatValue } from '../../common/utils/format';

import {
  type Indicator,
  type IndicatorTemplate,
  type IndicatorFigureStylesCallbackData,
} from '../../component/Indicator';

interface Ao {
  ao?: number;
}

const awesomeOscillator: IndicatorTemplate<Ao> = {
  name: 'AO',
  shortName: 'AO',
  calcParams: [5, 34],
  figures: [
    {
      key: 'ao',
      title: 'AO: ',
      type: 'bar',
      baseValue: 0,
      styles: (
        data: IndicatorFigureStylesCallbackData<Ao>,
        indicator: Indicator<Ao>,
        defaultStyles: IndicatorStyle,
      ) => {
        const { prev, current } = data;
        const prevAo = prev.indicatorData?.ao ?? Number.MIN_SAFE_INTEGER;
        const currentAo = current.indicatorData?.ao ?? Number.MIN_SAFE_INTEGER;
        let color: string;
        if (currentAo > prevAo) {
          color = formatValue(
            indicator.styles,
            'bars[0].upColor',
            defaultStyles.bars[0].upColor,
          ) as string;
        } else {
          color = formatValue(
            indicator.styles,
            'bars[0].downColor',
            defaultStyles.bars[0].downColor,
          ) as string;
        }
        const style =
          currentAo > prevAo ? PolygonType.Stroke : PolygonType.Fill;
        return { color, style, borderColor: color };
      },
    },
  ],
  calc: (dataList: TViewData[], indicator: Indicator<Ao>) => {
    const params = indicator.calcParams;
    const maxPeriod = Math.max(params[0] as number, params[1] as number);
    let shortSum = 0;
    let longSum = 0;
    let short = 0;
    let long = 0;
    return dataList.map((TViewData: TViewData, i: number) => {
      const ao: Ao = {};
      const middle = (TViewData.low + TViewData.high) / 2;
      shortSum += middle;
      longSum += middle;
      if (i >= params[0] - 1) {
        short = shortSum / params[0];
        const agoTViewData = dataList[i - (params[0] - 1)];
        shortSum -= (agoTViewData.low + agoTViewData.high) / 2;
      }
      if (i >= params[1] - 1) {
        long = longSum / params[1];
        const agoTViewData = dataList[i - (params[1] - 1)];
        longSum -= (agoTViewData.low + agoTViewData.high) / 2;
      }
      if (i >= maxPeriod - 1) {
        ao.ao = short - long;
      }
      return ao;
    });
  },
};

export default awesomeOscillator;