#include <Windows.h>
#include <tchar.h>


LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow) // C언어로 치면 선언문

{
	HWND hwnd;
	MSG msg;
	WNDCLASS WndClass;
	WndClass.style = CS_HREDRAW | CS_VREDRAW;
	WndClass.lpfnWndProc = WndProc;
	WndClass.cbClsExtra = 0;
	WndClass.cbWndExtra = 0;
	WndClass.hInstance = hInstance;
	WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	WndClass.hCursor = LoadCursor(NULL, IDC_IBEAM);
	WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	WndClass.lpszMenuName = NULL;
	WndClass.lpszClassName = _T("window Class Name");

	RegisterClass(&WndClass);

	hwnd = CreateWindow(_T("window Class name"),
		_T("박우현의 첫 번쨰 윈도우"),
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL
		);

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);

	}

	return (int)msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	static TCHAR str[20][100];
	static int  count, count2, yPos;

	switch (iMsg)
	{
	case WM_CREATE:
		count = 0;
		count2 = 0;
		yPos = 380;
		break;

	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);
		for (int i = 0; i <= count2; i++)
		{
			TextOut(hdc, 0, yPos, str[i], _tcslen(str[i]));
		}
		EndPaint(hwnd, &ps);
		break;

	case WM_CHAR:
		if (wParam == VK_BACK && count > 0)
		{
			count--;
			if (count <= 0 && count2 > 0)// 2줄이상이고 글자가 없을때 개행할 수 있는 조건문
			{
				count = _tcslen(str[count2]);
				count2--;
			}
		}

		else if (wParam == VK_RETURN)
		{
			yPos = yPos - 20;
			count2++;
			count = 0;
		}

		else
		{
			str[count2][count++] = wParam;
		}
		str[count2][count] = NULL;
		InvalidateRgn(hwnd, NULL, TRUE);
		break;


	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	}

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

}