#include <windows.h>
#include <time.h>
#include "stdafx.h"


LPCSTR registration_error_message = "Couldn't initialize class!";
LPCSTR registration_error_title = "Error: initializing";
LPCSTR creating_window_error_title = "Error: creating";
LPCSTR creating_window_error_message = "Couldn't create window!";

LPCSTR button_show_text = "ФЛАГ СТРАНЫ";
LPCSTR button_clear_text = "СТЕРЕТЬ ФЛАГ";
LPCSTR button_about_text = "СОЗДАТЕЛЬ";

LPCSTR main_window_name = "Hello App";
LPCSTR main_window_class = "hello_class";

LPCSTR about_text = "MИХАЙЛОВА ИРИНА ИУ3-21Б ";

LRESULT CALLBACK window_callback(HWND, UINT, WPARAM, LPARAM);
HINSTANCE hInst;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) {
    HWND main_window;
    MSG msg;
    WNDCLASSEX wc;

    wc.cbSize = sizeof(wc);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = window_callback;
    wc.lpszMenuName = NULL;
    wc.lpszClassName = main_window_class;
    wc.cbWndExtra = 0;
    wc.cbClsExtra = 0;
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.hInstance = hInstance;

    if (!RegisterClassEx(&wc)) {
        MessageBox(NULL, registration_error_message, registration_error_title, MB_OK);
        return NULL;
    }

    main_window = CreateWindow(main_window_class,
        main_window_name,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL);

    if (!main_window) {
        MessageBox(NULL, creating_window_error_message, creating_window_error_title, MB_OK);
        return NULL;
    }

    ShowWindow(main_window, iCmdShow);
    UpdateWindow(main_window);

    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

#define BTN_WIDTH 150
#define BTN_HEIGHT 20
LRESULT CALLBACK window_callback(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) {
    HDC hdc;
    PAINTSTRUCT ps;
    RECT rect;
    HWND button_show, button_clear, button_author;
    int loword;
    static int choise = 0;
    static HPEN hpen;
    static HBRUSH hbrush;

    switch (iMsg) {
    case WM_CREATE:
        button_show = CreateWindow("button", button_show_text,
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            100, 50, BTN_WIDTH, BTN_HEIGHT,
            hwnd, (HMENU)1, hInst, NULL);

        button_clear = CreateWindow("button", button_clear_text,
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            300, 50, BTN_WIDTH, BTN_HEIGHT,
            hwnd, (HMENU)2, hInst, NULL);

        button_author = CreateWindow("button", button_about_text,
            WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
            500, 50, BTN_WIDTH, BTN_HEIGHT,
            hwnd, (HMENU)3, hInst, NULL);
        return 0;

    case WM_COMMAND:
        hpen = CreatePen(PS_SOLID, 10, RGB(0, 0, 0));
        hbrush = CreateSolidBrush(RGB(255, 255, 255));
        loword = LOWORD(wParam);

        switch (loword) {
        case 1:
            choise = 1;
            break;
        case 2:
            choise = 2;
            break;
        case 3:
            choise = 3;
            break;
        default:
            break;
        }

        InvalidateRect(hwnd, NULL, TRUE);
        return 0;

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

        GetClientRect(hwnd, &rect);
        SelectObject(hdc, hbrush);
        SelectObject(hdc, hpen);

        switch (choise) {
        case 1:
            Rectangle(hdc, 200, 200, 700, 300);

            hbrush = CreateSolidBrush(RGB(10, 10, 132));
            hpen = CreatePen(PS_SOLID, 10, RGB(0, 0, 0));
            SelectObject(hdc, hbrush);
            SelectObject(hdc, hpen);

            Rectangle(hdc, 200, 300, 700, 400);

            hbrush = CreateSolidBrush(RGB(255, 0, 0));
            hpen = CreatePen(PS_SOLID, 10, RGB(0, 0, 0));
            SelectObject(hdc, hbrush);
            SelectObject(hdc, hpen);
            Rectangle(hdc, 200, 400, 700, 500);
            break;
        case 2:
            break;
        case 3:
            TextOut(hdc, 500, 300, about_text, strlen(about_text));
            break;
        }

        EndPaint(hwnd, &ps);
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}