#include "stdafx.h"
#include <windows.h>  //include all the basics
#include <tchar.h>    //string and other mapping macros
#include <string>
   
// Define structure for colors
typedef struct rgbColors {
	int R,G,B;
} RGBColor;

#define MAXCOLOR 10

//define an unicode string type alias
typedef std::basic_string<TCHAR> ustring;

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

void DrawARectangle(HWND hwnd, HPEN hpen, HDC hdc,HBRUSH hbrush,
PAINTSTRUCT pntS, const RECT& rc);

void PaintObject(HWND hwnd, const RECT& rc, RGBColor *c, int p);
RECT initRecArea(int l,int r,int t,int b);

inline int ErrMsg(const ustring&);

//setup some edit control id's
enum {
	IDCE_SINGLELINE=200,
	IDCE_MULTILINE,
};

int WINAPI WinMain(HINSTANCE hInst,HINSTANCE,LPSTR pStr,int nCmd)
{
	ustring classname=_T("RFS Range");
	WNDCLASSEX wcx={0}; 
	wcx.cbSize = sizeof(WNDCLASSEX);           
	wcx.lpfnWndProc = WndProc;
	wcx.hInstance = hInst;
	wcx.hIcon = LoadImage(0,IDI_APPLICATION,IMAGE_ICON,0,0,LR_SHARED);
	wcx.hCursor = LoadImage(0,IDC_ARROW,IMAGE_CURSOR,0,0,LR_SHARED);
	wcx.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE+1);   
	wcx.lpszClassName = classname.c_str(); 

	if (!RegisterClassEx(&wcx))
	{
		ErrMsg(_T("Failed to register wnd class"));
		return -1;
	}

	int desktopwidth=GetSystemMetrics(SM_CXSCREEN);
	int desktopheight=GetSystemMetrics(SM_CYSCREEN);

	HWND hwnd=CreateWindowEx(0,                     //extended styles
		classname.c_str(),     //name: wnd 'class'
		_T("RFS Range"),	   //wnd title
		WS_OVERLAPPEDWINDOW,   //wnd style
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		/*desktopwidth/4,        //position:left
		desktopheight/4,       //position: top
		desktopwidth/2,        //width
		desktopheight/2,       //height*/
		0,                     //parent wnd handle
		0,                     //menu handle/wnd id
		hInst,                 //app instance
		0);                    //user defined info
	if (!hwnd)
	{
		ErrMsg(_T("Failed to create wnd"));
		return -1;
	}

	ShowWindow(hwnd,nCmd); 
	UpdateWindow(hwnd);
	MSG msg;

	while (GetMessage(&msg,0,0,0)>0)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return static_cast<int>(msg.wParam);
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	int pos=0;
	RGBColor colors[MAXCOLOR] = {{0x80,0x80,0x80},{0x00,0xFF,0x00},
	{0xFF,0xFF,0xFF},{0x00,0x00,0x00}};

	switch (uMsg)
	{
	case WM_CREATE:
          return 0;

	case WM_PAINT:

	   // Draw rectangle area 1
	   PaintObject(hwnd,initRecArea(5,5,300,350),colors,pos);

	   // Draw rectangle area 2
	   PaintObject(hwnd,initRecArea(400,5,800,250),colors,pos);

	   return 0;

	case WM_TIMER: 
	   /* Force the WM_PAINT */
	   InvalidateRect (hwnd, NULL, TRUE);
	   UpdateWindow(hwnd);
	break;

	case WM_DESTROY:
	   PostQuitMessage(0);
	   return 0;

	default:

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

inline int ErrMsg(const ustring& s)
{
return MessageBox(0,s.c_str(),_T("ERROR"),MB_OK|MB_ICONEXCLAMATION);
}

// Purpose: Draws a rectangle which will have text boxes for input data
void DrawARectangle(HWND hwnd, HPEN hpen, HDC hdc, 
					HBRUSH hbrush, PAINTSTRUCT pntS, const RECT& rc) 
{
	HPEN hpenOld;
	HBRUSH hbrushOld;

	// Select the new pen and brush, and then draw.
	hpenOld = (HPEN)SelectObject(hdc, hpen);
	hbrushOld = (HBRUSH)SelectObject(hdc, hbrush);
	Rectangle(hdc,rc.left,rc.top,rc.right,rc.bottom);

	// Do not forget to clean up.
	SelectObject(hdc, hpenOld);
	DeleteObject(hpen);
	SelectObject(hdc, hbrushOld);
	DeleteObject(hbrush);
}

// Purpose: Draws an object on the window
void PaintObject(HWND hwnd, const RECT& rc, RGBColor *color, int index)
{
	HDC hdc;
	HPEN hpen;
	HBRUSH hbrush;
	PAINTSTRUCT pntS;

	hdc = BeginPaint(hwnd, &pntS);									
	hpen = CreatePen(PS_SOLID, 2, RGB(color[index+3].R, color[index+3].G, color[index+3].B));
	hbrush = CreateSolidBrush(RGB(color[index].R, color[index].G, color[index].B));
	DrawARectangle(hwnd, hpen, hdc, hbrush, pntS, rc);
	EndPaint(hwnd, &pntS);
}

// Initialize rectangle area
RECT initRecArea(int left, int top, int width, int height)
{
	RECT rec = {left, top, width, height};
	return rec;
}