#include <windows.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>

#define WINDOW_WIDTH  800
#define WINDOW_HEIGHT 600
#define PLAYER_WIDTH  60
#define PLAYER_HEIGHT 20
#define ENEMY_WIDTH   40
#define ENEMY_HEIGHT  20
#define BULLET_WIDTH  5
#define BULLET_HEIGHT 10

// 游戏状态
int playerX = WINDOW_WIDTH / 2;  // 玩家位置
int bulletX = -1, bulletY = -1;  // 子弹位置，初始不可见
int enemyX, enemyY;              // 敌机位置
int score = 0;                   // 得分
BOOL bulletVisible = FALSE;

// 初始化敌机位置
void InitEnemy() {
    enemyX = rand() % (WINDOW_WIDTH - ENEMY_WIDTH);
    enemyY = 0;
}

// 碰撞检测
BOOL CheckCollision() {
    return bulletX >= enemyX && bulletX <= enemyX + ENEMY_WIDTH &&
           bulletY >= enemyY && bulletY <= enemyY + ENEMY_HEIGHT;
}

// 绘制游戏内容
void DrawGame(HDC hdc) {
    // 清空背景
    RECT rect;
    rect.left = 0;
    rect.top = 0;
    rect.right = WINDOW_WIDTH;
    rect.bottom = WINDOW_HEIGHT;
    FillRect(hdc, &rect, (HBRUSH)(COLOR_WINDOW + 1));

    // 绘制玩家飞船
    Rectangle(hdc, playerX, WINDOW_HEIGHT - PLAYER_HEIGHT - 10,
              playerX + PLAYER_WIDTH, WINDOW_HEIGHT - 10);

    // 绘制子弹
    if (bulletVisible) {
        Rectangle(hdc, bulletX, bulletY, bulletX + BULLET_WIDTH, bulletY + BULLET_HEIGHT);
    }

    // 绘制敌机
    Rectangle(hdc, enemyX, enemyY, enemyX + ENEMY_WIDTH, enemyY + ENEMY_HEIGHT);

    // 显示分数
    char scoreText[32];
    sprintf(scoreText, "Score: %d", score);
    TextOut(hdc, 10, 10, scoreText, strlen(scoreText));
}

// 处理窗口消息
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
    static HDC hdc;
    static PAINTSTRUCT ps;

    switch (uMsg) {
        case WM_CREATE:
            srand((unsigned int)time(NULL)); // 随机种子
            InitEnemy();
            SetTimer(hwnd, 1, 30, NULL);     // 设置游戏刷新定时器
            return 0;

        case WM_TIMER:
            // 更新子弹位置
            if (bulletVisible) {
                bulletY -= 10;
                if (bulletY < 0) {
                    bulletVisible = FALSE;
                }
            }

            // 更新敌机位置
            enemyY += 5;
            if (enemyY > WINDOW_HEIGHT) {
                InitEnemy();  // 重新初始化敌机位置
            }

            // 检测碰撞
            if (bulletVisible && CheckCollision()) {
                score += 10;
                bulletVisible = FALSE;
                InitEnemy();  // 击中后重新生成敌机
            }

            InvalidateRect(hwnd, NULL, FALSE); // 触发重绘
            return 0;

        case WM_KEYDOWN:
            // 控制玩家飞船移动
            if (wParam == VK_LEFT && playerX > 0) {
                playerX -= 10;
            } else if (wParam == VK_RIGHT && playerX < WINDOW_WIDTH - PLAYER_WIDTH) {
                playerX += 10;
            } else if (wParam == VK_SPACE && !bulletVisible) {
                // 发射子弹
                bulletVisible = TRUE;
                bulletX = playerX + PLAYER_WIDTH / 2;
                bulletY = WINDOW_HEIGHT - PLAYER_HEIGHT - 20;
            }
            return 0;

        case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);
            DrawGame(hdc);
            EndPaint(hwnd, &ps);
            return 0;

        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

// WinMain 函数：程序的入口点
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    const char CLASS_NAME[] = "AirplaneGame";

    // 注册窗口类
    WNDCLASS wc = { };
    wc.lpfnWndProc = WindowProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);

    RegisterClass(&wc);

    // 创建窗口
    HWND hwnd = CreateWindowEx(
        0,
        CLASS_NAME,
        "打飞机游戏",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, WINDOW_WIDTH, WINDOW_HEIGHT,
        NULL,
        NULL,
        hInstance,
        NULL
    );

    if (hwnd == NULL) {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    // 消息循环
    MSG msg = { };
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}