#define _CRT_SECURE_NO_WARNINGS
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>

WORD TIMER = 1;
MSG msg;
LPSTR className = TEXT("windowClass");
RECT wSize;

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
static bool registerClass();
HWND hwnd;

HWND label;
HWND inputText;
HWND countButton;

HWND cmRadio;
HWND inchRadio;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	if (!registerClass())
	{
		MessageBox(NULL, TEXT("Nie udało się zarejestrować klasy okna"), TEXT("Błąd"), MB_OK | MB_ICONERROR);
		return 1;
	}
	
	hwnd = CreateWindowEx(0, className, TEXT("Przelicznik"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 400, 600, 
		NULL, NULL, hInstance, NULL);

	if (hwnd == NULL)
	{
		MessageBox(NULL, TEXT("Nie udało się utworzyć okna"), TEXT("Błąd"), MB_OK | MB_ICONERROR);
		return 1;
	}

	
	inputText = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("EDIT"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | ES_MULTILINE | ES_AUTOHSCROLL, 100, 100, 130, 30, hwnd, NULL, hInstance, NULL);
	cmRadio = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("BUTTON"), TEXT("CM"), WS_CHILD | WS_VISIBLE | BS_RADIOBUTTON , 100, 140, 50, 30, hwnd, (HMENU) 1, hInstance, NULL);
	inchRadio = CreateWindowEx(WS_EX_CLIENTEDGE, TEXT("BUTTON"), TEXT("INCH"), WS_CHILD | WS_VISIBLE | BS_RADIOBUTTON | WS_GROUP, 160, 140, 60, 30, hwnd, (HMENU) 2, hInstance, NULL);
	label = CreateWindowEx(0, TEXT("STATIC"), NULL, WS_CHILD | WS_VISIBLE | WS_BORDER | SS_CENTER, 100, 200, 130, 30, hwnd, NULL, hInstance, NULL);;
	CheckRadioButton(hwnd, 1, 2, 2);
	int inchID = GetDlgCtrlID(inchRadio);
	int cmID = GetDlgCtrlID(cmRadio);

	GetWindowRect(hwnd, &wSize);
	

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

	if (SetTimer(hwnd, TIMER, 100, NULL) == 0)
		MessageBox(hwnd, "Nie można utworzyć timera!", "Kurde", MB_ICONSTOP);


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

	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

	int inchID = GetDlgCtrlID(inchRadio);
	int cmID = GetDlgCtrlID(cmRadio);
	static bool cm = false;
	switch (msg)
	{
		case WM_TIMER:
		{
			CHAR buff[100];
			GetWindowText(inputText, buff, 100);
			char r[100];
			float f = atof(buff);
			if (cm)
			{
				sprintf(r, "%f", f * 2.5);
			}
			else
			{
				sprintf(r, "%f", f / 2.5);
			}
			
			SetWindowText(label, TEXT(r));
		}break;

		case WM_CLOSE:
		{
			DestroyWindow(hwnd);
		}break;

		case WM_COMMAND:
		{
			if (wParam == 1)
			{
				CheckRadioButton(hwnd, 1, 2, 1);
				cm = true;
			}

			if (wParam == 2)
			{
				CheckRadioButton(hwnd, 1, 2, 2);
				cm = false;
			}
		}break;

		case WM_SIZE:
		{
			GetWindowRect(hwnd, &wSize);
			int width = (wSize.right - wSize.left);
			int height = (wSize.bottom - wSize.top);

			MoveWindow(inputText, width / 2 - 50, height / 2 - 100, 130, 30, TRUE);
			MoveWindow(label, width / 2 - 50, height / 2 - 50, 130, 30, TRUE);
			MoveWindow(cmRadio, width / 2 - 50, height / 2, 50, 30, TRUE);
			MoveWindow(inchRadio, width / 2 - 50 + 100, height / 2, 50, 30, TRUE);
		}break;

		case WM_DESTROY:
		{
			PostQuitMessage(0);
		}break;

		default:
		{
			return DefWindowProc(hwnd, msg, wParam, lParam);
		}break;
	}
}

static bool registerClass()
{
	WNDCLASSEX wc;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.style = 0;
	wc.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(255, 255, 255));
	wc.lpfnWndProc = WndProc;
	wc.lpszClassName = className;
	wc.lpszMenuName = NULL;
	wc.hInstance = GetModuleHandle(NULL);
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);

	return (RegisterClassEx(&wc) != 0);
}