sporttery/server/triangle/trangleCalc.js

const Logs = require('../libs/logs');
const IOR_KEYS_MAP = require('./iorKeys');

const SETTING = {
  innerDefaultAmount: 10000,
  minProfitAmount: 0,
  innerRebateRatio: 0,
  obRebateRatio: 0,
  hgRebateRatio: 0,
}

/**
 * 筛选最优赔率
 */
function getOptimalSelections(odds, rules) {
  const results = [];
  const { obRebateRatio, hgRebateRatio } = SETTING;
  const obRebate = 1 + obRebateRatio / 100;
  const hgRebate = 1 + hgRebateRatio / 100;

  rules.forEach((rule, index) => {
    let validOptions = [];

    for (let i = 0; i < 3; i++) {
      const innerIndex = i;
      const selection = [];
      let isValid = true;
      for (let j = 0; j < 3; j++) {
        const key = rule[j];
        const item = odds[key];

        if (!item) {
          isValid = false;
          break;
        }
        if (j === innerIndex) {
          if (!('ps' in item)) {
            isValid = false;
            break;
          }
          selection.push({
            k: key,
            p: 'ps',
            v: item.ps,
            o: item,
          });
        }
        else {
          const candidates = ['ob', 'hg'].filter((k) => k in item);
          if (candidates.length === 0) {
            isValid = false;
            break;
          }
          const best = candidates.reduce((a, b) => item[a]*obRebate > item[b]*hgRebate ? a : b);
          selection.push({
            k: key,
            p: best,
            v: item[best],
            o: item,
          });
        }
      }

      if (isValid) {
        validOptions.push(selection);
      }
    }

    if (validOptions.length > 0) {
      const iors = validOptions.reduce((a, b) => {
        const sumA = a.reduce((sum, x) => sum + x.v, 0);
        const sumB = b.reduce((sum, x) => sum + x.v, 0);
        return sumA > sumB ? a : b;
      });
      results.push({ rule, iors, index });
    }
  });

  return results;
}

/**
 * 精确浮点数字
 * @param {number} number
 * @param {number} x
 * @returns {number}
 */
const fixFloat = (number, x=2) => {
  return parseFloat(number.toFixed(x));
}

/**
 * 计算盈利
 */
const triangleProfitCalc = (goldsInfo, oddsOption) => {
  const { innerRebateRatio } = SETTING;
  const {
    gold_side_a: x,
    gold_side_b: y,
    gold_side_c: z,
    odds_side_a: a,
    odds_side_b: b,
    odds_side_c: c
  } = goldsInfo;

  const { crossType, innerIndex, rebateA: A = 0, rebateB: B = 0, rebateC: C = 0 } = oddsOption;
  /**
   * crossType:
   *  la: 全输
   *  wa: 全赢
   *  lh: 半输
   *  wh: 半赢
   *  dr: 和局
   *  la_wh_wa, la_dr_wa, la_lh_wa, lh_dr_wa, lh_lh_wa, la_la_wa
   */

  let inner_rebate = 0;
  if (innerIndex == 0) {
    inner_rebate = x * innerRebateRatio;
  }
  else if (innerIndex == 1) {
    inner_rebate = y * innerRebateRatio;
  }
  else if (innerIndex == 2) {
    inner_rebate = z * innerRebateRatio;
  }

  let win_side_a = 0, win_side_b = 0, win_side_c = 0;
  win_side_a = a*x - y - z + a*A*x + B*y + C*z;
  win_side_b = b*y - x - z + b*B*y + A*x + C*z;

  switch (crossType) {
    case 'la_wh_wa': // 全输 半赢 全赢
      win_side_c = c*z - x + b*y/2 + c*C*z + A*x + b*B*y/2;
      break;
    case 'la_dr_wa': // 全输 和局 全赢
      win_side_c = c*z - x + c*C*z + A*x;
      break;
    case 'la_lh_wa': // 全输 半输 全赢
      win_side_c = c*z - x - y/2 + c*C*z + A*x + B*y/2;
      break;
    case 'lh_dr_wa': // 半输 和局 全赢
      win_side_c = c*z - x/2 + c*C*z + A*x/2;
      break;
    case 'lh_lh_wa': // 半输 半输 全赢
      win_side_c = c*z - x/2 - y/2 + c*C*z + A*x/2 + B*y/2;
      break;
    case 'la_la_wa': // 全输 全输 全赢
      win_side_c = c*z - x - y + c*C*z + A*x + B*y;
      break;
  }

  win_side_a = fixFloat(win_side_a + inner_rebate);
  win_side_b = fixFloat(win_side_b + inner_rebate);
  win_side_c = fixFloat(win_side_c + inner_rebate);
  const win_average = fixFloat((win_side_a + win_side_b + win_side_c) / 3);

  return { win_side_a, win_side_b, win_side_c, win_average }
}

const triangleGoldCalc = (oddsInfo, oddsOption) => {
  const { innerDefaultAmount } = SETTING;
  const { odds_side_a: a, odds_side_b: b, odds_side_c: c } = oddsInfo;
  if (!a || !b || !c) {
    return;
  }
  const { crossType, innerIndex, rebateA: A = 0, rebateB: B = 0, rebateC: C = 0 } = oddsOption;
  let x = innerDefaultAmount;
  let y = (a + a*A + 1 - A) * x / (b + b*B + 1 - B);
  let z;
  switch (crossType) {
    case 'la_wh_wa': // 全输 半赢 全赢
      z = (b + b*B) * y / 2 / (c + c*C + 1 - C);
      break;
    case 'la_dr_wa': // 全输 和局 全赢
      z = (b + b*B) * y / (c + c*C + 1 - C);
      break;
    case 'la_lh_wa': // 全输 半输 全赢
      z = (2*b + 2*b*B + 1 - B) * y / 2 / (c + c*C + 1 - C);
      break;
    case 'lh_dr_wa': // 半输 和局 全赢
      z = ((b + b*B) * y - (1 - A) * x / 2) / (c + c*C + 1 - C);
      break;
    case 'lh_lh_wa': // 半输 半输 全赢
      z = ((2*b + 2*b*B + 1 - B) * y / 2 + (1 - A) * x / 2) / (c + c*C + 1 - C);
      break;
    case 'la_la_wa': // 全输 全输 全赢
      z = (b + b*B + 1 - B) * y / (c + c*C + 1 - C);
      break;
    default:
      z = 0;
  }

  if (innerIndex == 1) {
    const scale = innerDefaultAmount / y;
    x = x * scale;
    y = innerDefaultAmount;
    z = z * scale;
  }
  else if (innerIndex == 2) {
    const scale = innerDefaultAmount / z;
    x = x * scale;
    y = y * scale;
    z = innerDefaultAmount;
  }

  return {
    gold_side_a: x,
    gold_side_b: fixFloat(y),
    gold_side_c: fixFloat(z),
    odds_side_a: a,
    odds_side_b: b,
    odds_side_c: c,
  };

}

const eventSolutions = (oddsInfo, oddsOption) => {
  const { innerDefaultAmount } = SETTING;
  const goldsInfo = triangleGoldCalc(oddsInfo, oddsOption);
  if (!goldsInfo) {
    return;
  }
  const profitInfo = triangleProfitCalc(goldsInfo, oddsOption);

  const { odds_side_a, odds_side_b, odds_side_c } = goldsInfo;
  const { win_average } = profitInfo;
  return {
    odds_side_a,
    odds_side_b,
    odds_side_c,
    win_average,
    cross_type: oddsOption.crossType,
    inner_index: oddsOption.innerIndex,
    inner_base: innerDefaultAmount,
  }
}

/**
 * 将数组中的指定索引的元素移动到最前面
*/
const moveToFront = (arr, index) => {
  if (index < 0 || index >= arr.length) return arr; // index 越界处理
  const item = arr.splice(index, 1)[0]; // 删除该项并获取
  arr.unshift(item); // 插入到最前面
  return arr;
}

/**
 * 添加返佣
 */
const attachRebate = (ior) => {
  const { innerRebateRatio, obRebateRatio, hgRebateRatio } = SETTING;
  const { p } = ior;
  let rebate = 0;
  if (p == 'ps') {
    rebate = innerRebateRatio;
  }
  else if (p == 'ob') {
    rebate = obRebateRatio;
  }
  else if (p == 'hg') {
    rebate = hgRebateRatio;
  }
  return { ...ior, r: rebate };
}

const eventsCombination = (passableEvents, setting) => {

  Object.keys(setting).forEach(key => {
    if (key in SETTING && SETTING[key] !== setting[key]) {
      SETTING[key] = setting[key];
      Logs.out(`setting ${key} changed to ${setting[key]}`);
    }
  });

  const solutions = {};
  passableEvents.forEach(events => {
    const { odds, info } = events;
    Object.keys(IOR_KEYS_MAP).forEach(iorGroup => {
      const rules = IOR_KEYS_MAP[iorGroup];
      const optimalSelections = getOptimalSelections(odds, rules);

      optimalSelections.forEach(selection => {
        const { rule, iors, index } = selection;
        const [, , , crossType] = rule;
        const oddsSideA = attachRebate(iors[0]);
        const oddsSideB = attachRebate(iors[1]);
        const oddsSideC = attachRebate(iors[2]);
        const innerIndex = iors.findIndex(item => item.p == 'ps');
        if (!oddsSideA || !oddsSideB || !oddsSideC) {
          return;
        }
        const cpr = [ oddsSideA, oddsSideB, oddsSideC ];
        const oddsInfo = {
          odds_side_a: fixFloat(oddsSideA.v - 1),
          odds_side_b: fixFloat(oddsSideB.v - 1),
          odds_side_c: fixFloat(oddsSideC.v - 1),
        };
        const oddsOption = {
          crossType, innerIndex,
          rebateA: parseFloat((oddsSideA.r / 100).toFixed(4)),
          rebateB: parseFloat((oddsSideB.r / 100).toFixed(4)),
          rebateC: parseFloat((oddsSideC.r / 100).toFixed(4)),
        };
        const sol = eventSolutions(oddsInfo, oddsOption);
        if (sol?.win_average > SETTING.minProfitAmount) {
          const id = info.id;
          const sortedCpr = moveToFront([...cpr], innerIndex);
          const crpGroup = `${id}_${sortedCpr[0].k}`;
          const keys = sortedCpr.map(item => `${item.k}`).join('_');
          const sid = `${id}_${keys}`;
          const timestamp = Date.now();
          if (!solutions[crpGroup]) {
            solutions[crpGroup] = [];
          }
          solutions[crpGroup].push({sid, sol, cpr, info, rule: `${iorGroup}:${index}`, timestamp});
        }
      });
    });
  });
  return Object.values(solutions).map(item => {
    return item.sort((a, b) => {
      return b.sol.win_average - a.sol.win_average;
    })
    .slice(0, 2);
  })
  .sort((a, b) => {
    return b[0].sol.win_average - a[0].sol.win_average;
  });
}

module.exports = { eventsCombination };