From da0f2160ce236d3899f5397f9462fc8300be6e54 Mon Sep 17 00:00:00 2001
From: Kieran Kihn <114803508+kierankihn@users.noreply.github.com>
Date: Sun, 16 Nov 2025 19:52:47 +0800
Subject: [PATCH] feat(game): add `canBePlayedOn` for `Card`

---
 src/game/Card.cpp | 18 ++++++++++++++++++
 src/game/Card.h   |  6 ++++++
 2 files changed, 24 insertions(+)

diff --git a/src/game/Card.cpp b/src/game/Card.cpp
index 9abf7a7..c6b6d46 100644
--- a/src/game/Card.cpp
+++ b/src/game/Card.cpp
@@ -75,4 +75,22 @@ namespace UNO::GAME {
         }
         return this->type_ < other.type_;
     }
+
+    bool Card::canBePlayedOn(const Card &other) const
+    {
+        if (other.getType()== CardType::DRAW2 && this->type_ != CardType::DRAW2 && this->type_ != CardType::WILDDRAWFOUR) {
+            return false;
+        }
+        if (other.getType() == CardType::WILDDRAWFOUR && this->type_ != CardType::WILDDRAWFOUR) {
+            return false;
+        }
+        if (this->color_ == CardColor::WILD) {
+            return true;
+        }
+        if (this->color_ == other.getColor() || this->type_ == other.getType()) {
+            return true;
+        }
+        return false;
+    }
+
 }
diff --git a/src/game/Card.h b/src/game/Card.h
index 3082265..a30012d 100644
--- a/src/game/Card.h
+++ b/src/game/Card.h
@@ -86,6 +86,12 @@ namespace UNO::GAME {
          * 比较运算符，用于排序
          */
         bool operator<(const Card &other) const;
+
+        /**
+         * @param other 另一张牌
+         * @return 是否能在打出另一张牌后打出
+         */
+        [[nodiscard]] bool canBePlayedOn(const Card &other) const;
     };
 }   // namespace UNO::GAME