Fix horse race seed pool payouts

2026-04-11 16:11:00 +08:00
parent cc1dd017ce
commit 44db0d7853
7 changed files with 103 additions and 21 deletions
@@ -114,33 +114,43 @@ class HorseRace extends Model
    }

    /**
-     * 根据注池计算各马匹实时赔率（彩池制，扣除庄家抽水后按比例分配）。
+     * 计算本场可派奖总池。
     *
-     * @param  int  $horseBetAmounts  各马匹的注额数组 [horse_id => amount]
-     * @param  int  $housePercent  庄家抽水百分比
+     * 可派奖池 = 系统初始化资金池 + 玩家总下注 - 抽水，
+     * 且至少不低于中奖马匹总下注，避免出现“押中反亏”的体验。
+     *
+     * @param  array<int, int|float>  $horseBetAmounts
+     */
+    public static function calcDistributablePool(array $horseBetAmounts, int $housePercent, int $seedPool = 0, int $winnerPool = 0): float
+    {
+        $totalPool = array_sum($horseBetAmounts);
+        $netPlayerPool = $totalPool * (1 - $housePercent / 100);
+
+        return max($netPlayerPool + max(0, $seedPool), $winnerPool);
+    }
+
+    /**
+     * 根据注池计算各马匹实时赔率（含系统初始化资金池）。
+     *
+     * @param  array<int, int|float>  $horseBetAmounts  各马匹的注额数组 [horse_id => amount]
     * @return array<int, float> horse_id => 赔率（含本金）
     */
-    public static function calcOdds(array $horseBetAmounts, int $housePercent): array
+    public static function calcOdds(array $horseBetAmounts, int $housePercent, int $seedPool = 0): array
    {
        $totalPool = array_sum($horseBetAmounts);

        if ($totalPool <= 0) {
-            // 尚无下注，返回等额赔率
-            $count = count($horseBetAmounts);
-
            return array_map(fn () => 1.0, $horseBetAmounts);
        }

-        $netPool = $totalPool * (1 - $housePercent / 100);
+        $distributablePool = static::calcDistributablePool($horseBetAmounts, $housePercent, $seedPool);
        $odds = [];

        foreach ($horseBetAmounts as $horseId => $amount) {
            if ($amount <= 0) {
-                // 无人押注的马，赔率设为理论最大值
-                $odds[$horseId] = round($netPool, 2);
+                $odds[$horseId] = round($distributablePool, 2);
            } else {
-                // 赔率 = 净注池 / 该马注额（含本金返还）
-                $odds[$horseId] = round($netPool / $amount, 2);
+                $odds[$horseId] = round($distributablePool / $amount, 2);
            }
        }