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src/engine/chengdu_mahjong_engine.py

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+class ChengduMahjongEngine:
+    def __init__(self):
+        self.state = ChengduMahjongState()
+        self.game_over = False
+
+    def draw_tile(self):
+        # 当前玩家摸牌
+        if self.state.remaining_tiles == 0:
+            self.game_over = True
+            return "牌堆已空"
+        tile = self.state.deck.pop(0)
+        self.state.remaining_tiles -= 1
+        self.state.hands[self.state.current_player][tile] += 1
+        return tile
+
+    def discard_tile(self, tile):
+        # 当前玩家打牌
+        if self.state.hands[self.state.current_player][tile] == 0:
+            raise ValueError("当前玩家没有这张牌")
+        self.state.hands[self.state.current_player][tile] -= 1
+        self.state.discards[self.state.current_player].append(tile)
+
+    def peng(self, tile):
+        # 碰牌逻辑
+        player = self.state.current_player
+        if self.state.hands[player][tile] < 2:
+            raise ValueError("碰牌条件不满足")
+        self.state.hands[player][tile] -= 2
+        self.state.melds[player].append(("peng", tile))
+
+    def gang(self, tile, mode="ming"):
+        # 杠牌逻辑
+        player = self.state.current_player
+        if mode == "ming" and self.state.hands[player][tile] == 3:
+            self.state.hands[player][tile] -= 3
+            self.state.melds[player].append(("ming_gang", tile))
+        elif mode == "an" and self.state.hands[player][tile] == 4:
+            self.state.hands[player][tile] -= 4
+            self.state.melds[player].append(("an_gang", tile))
+        else:
+            raise ValueError("杠牌条件不满足")