import turtle
import random
import time
import string

def start_game(rows=8, cols=8):
    SIZE = 80
    COUNT = rows * cols
    WIDTH, HEIGHT = cols * SIZE, rows * SIZE

    # 初始化画布和窗口（上方留出按钮空间）
    screen = turtle.Screen()
    screen.setup(WIDTH + 40, HEIGHT + 80)  # 上方多出40像素放按钮
    screen.bgcolor('white')
    screen.title("字母翻牌游戏")

    # 注册字母图片（这里默认没有图片）
    for ch in string.ascii_uppercase:
        try:
            turtle.addshape(f"{ch}.gif")
        except:
            pass

    # 生成牌面内容
    tiles = random.sample(string.ascii_uppercase * 2, COUNT // 2) * 2
    random.shuffle(tiles)

    # 卡片是否隐藏
    hide = [True] * COUNT

    # 游戏状态
    state = {
        'mark': None,
        'matched_pair': None,
        'reveal': None
    }

    # 卡片乌龟
    turtles = [turtle.Turtle() for _ in range(COUNT)]
    for t in turtles:
        t.hideturtle()
        t.penup()

    # 公共画笔
    pen = turtle.Turtle()
    pen.hideturtle()
    pen.penup()

    # 返回按钮乌龟
    back_btn = turtle.Turtle()
    back_btn.hideturtle()
    back_btn.penup()

    def draw_back_button():
        back_btn.goto(-WIDTH // 2, HEIGHT // 2 + 10)
        back_btn.color("black", "lightgray")
        back_btn.begin_fill()
        for _ in range(2):
            back_btn.forward(100)
            back_btn.left(90)
            back_btn.forward(40)
            back_btn.left(90)
        back_btn.end_fill()
        back_btn.goto(-WIDTH // 2 + 20, HEIGHT // 2 + 15)
        back_btn.write("返回", font=("Arial", 16, "bold"))

    def check_back_button(x, y):
        bx1, by1 = -WIDTH // 2, HEIGHT // 2 + 10
        bx2, by2 = bx1 + 100, by1 + 40
        return bx1 <= x <= bx2 and by1 <= y <= by2

    def go_back_to_menu():
        screen.bye()
        import youxijiemian
        youxijiemian.show_start_window()
        # 你可以在这里调用 Tkinter 菜单，例如：show_start_window()

    def xy(i):
        x = -WIDTH // 2 + (i % cols) * SIZE
        y = -HEIGHT // 2 + (i // cols) * SIZE
        return x, y

    def index(x, y):
        col = int((x + WIDTH // 2) // SIZE)
        row = int((y + HEIGHT // 2) // SIZE)
        i = row * cols + col
        if 0 <= i < COUNT:
            return i
        return None

    def draw():
        pen.clear()
        for i in range(COUNT):
            x, y = xy(i)
            t = turtles[i]
            t.goto(x + SIZE // 2, y + SIZE // 2)

            if not hide[i]:
                t.hideturtle()
            elif i == state.get("mark") or i == state.get("reveal") or (state.get("matched_pair") and i in state["matched_pair"]):
                t.shape("square")
                t.shapesize(stretch_wid=3, stretch_len=3)
                t.color("black")
                t.showturtle()
                pen.goto(x + SIZE // 2 - 15, y + SIZE // 2 - 20)
                pen.write(tiles[i], font=('Arial', 24, 'bold'))
            else:
                pen.goto(x, y)
                pen.color('black', 'skyblue')
                pen.begin_fill()
                for _ in range(4):
                    pen.forward(SIZE - 10)
                    pen.left(90)
                pen.end_fill()
                t.hideturtle()
        draw_back_button()
        turtle.update()

    def hide_matched():
        i1, i2 = state["matched_pair"]
        hide[i1] = False
        hide[i2] = False
        state["matched_pair"] = None
        draw()

    def tap(x, y):
        if check_back_button(x, y):
            go_back_to_menu()
            return

        i = index(x, y)
        if i is None or not hide[i] or state.get("matched_pair"):
            return

        m = state.get("mark")
        if m is None:
            state["mark"] = i
        elif m == i:
            return
        elif tiles[m] != tiles[i]:
            state["reveal"] = i
            draw()
            time.sleep(0.5)
            state["mark"] = None
            state["reveal"] = None
        else:
            state["matched_pair"] = (m, i)
            state["mark"] = None
            state["reveal"] = None
            draw()
            screen.ontimer(hide_matched, 2000)

        draw()
        if all(not h for h in hide):
            pen.goto(0, 0)
            pen.color("green")
            pen.write("🎉 全部配对成功！", font=('Arial', 24, 'bold'))

    turtle.tracer(False)
    draw()
    turtle.onscreenclick(tap)
    turtle.done()

# 测试入口
if __name__ == "__main__":
    start_game(8, 8)