#include <windows.h>
#include <iostream>

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hwnd, &ps);

            FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_BTNFACE + 1));

            EndPaint(hwnd, &ps);
        }
        return 0;

    case WM_CHAR:
        std::cout << wParam << std::endl;
        break;

    }
    return DefWindowProcA(hwnd, uMsg, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR pCmdLine, int nCmdShow)
{
    // Register the window class.
    const char* CLASS_NAME  = "Sample Window Class";

    WNDCLASSA wc;
    ZeroMemory(&wc, sizeof(wc));

    wc.lpfnWndProc   = WindowProc;
    wc.hInstance     = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.hCursor = LoadCursor(0, IDC_ARROW);
    wc.hIcon = LoadIcon(0, IDI_WINLOGO);

    RegisterClassA(&wc);

    // Create the window.

    HWND hwnd = CreateWindowExA(
        0,                              // Optional window styles.
        CLASS_NAME,                     // Window class
        "Learn to Program Windows",    // Window text
        WS_OVERLAPPEDWINDOW,            // Window style

        // Size and position
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

        NULL,       // Parent window
        NULL,       // Menu
        hInstance,  // Instance handle
        NULL        // Additional application data
        );

    if (hwnd == NULL)
    {
        std::cout << "No window" << std::endl;
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

    // Run the message loop.

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

    return 0;
}