/**
 * 点位追踪计数器
 *
 * @alphaair
 * 20230516 created.
 **/

const utils = require("../../utils/utils");
const AiSport = requirePlugin("aiSport");
const SportBase = AiSport.sports.SportBase;

/**
 * 点位追踪运动分析器
 */
class SportPointTrack extends SportBase {
    _calc = null
    _prev = null
    _trend = null

    points = []

    /**
     * 初始化分析器
     * 
     * @param {int?} pointThreshold 计算器取点评分阈值
     */
    constructor(pointThreshold) {
        super(pointThreshold);

        this.tickMode = true;
        this._calc = new AiSport.calc.CalcBase();
    }

    pushing(body) {
        if (utils.isNone(body))
            return;

        const lhip = body.keypoints.find(x => x.name == 'left_hip');
        const rhip =  body.keypoints.find(x => x.name == 'right_hip');

        if (!lhip || !rhip)
            return;

        let y = lhip.y - rhip.y;
        y = Math.abs(y) / 2;
        y += Math.min(lhip.y, rhip.y);

        //首个点位
        if (this._prev === null) {
            this._prev = y;
            this.points.push(y);
            return;
        }

        //平
        if (y === this._prev)
            return;

        const t = y > this._prev;

        //首次趋势
        if (this._trend === null) {
            this._trend = t;
            this._prev = y;
            return;
        }

        //趋势变化
        if (t != this._trend) {
            this.emitTick();
            this.points.push(this._prev);
        }

        this._trend = t;
        this._prev = y;
    }
}

SportPointTrack.KEY = "Point-Track";
SportPointTrack.NAME = "自定义-点位追踪";

module.exports = SportPointTrack;