#include <windows.h>
#include <stdio.h>
#include <string>
#include "textPlay.h"

using namespace std;

const char className[] = "textPlay";
const char APP_TITLE[] = "Playing with text";

const unsigned short int APP_WIDTH = 500;
const unsigned short int APP_HEIGHT = 400;

static int fontHeight;

LRESULT CALLBACK mainEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM params);

LRESULT CALLBACK mainEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM params)
{
	
	if (event == WM_CREATE)
	{
		
		TEXTMETRIC tm;
		HDC hdc = GetDC(hwnd);
		
		GetTextMetrics(hdc, &tm);//Gets information about the font being used
		fontHeight = tm.tmHeight;
		
		ReleaseDC(hwnd, hdc);
		
	}
	else if (event == WM_PAINT)
	{
		
		PAINTSTRUCT ps;
		RECT clientArea;
		
		HDC hdc = BeginPaint(hwnd, &ps);
		
		GetClientRect(hwnd, &clientArea); //Gets the size of the client area
		
		char buffer[30]; //Makes a message with the dimensions of the client area embedded
		sprintf(buffer, "width = %03u, height = %03u", clientArea.right, clientArea.bottom);
		
		int fromTop = 20;
		string strHello = "Hello World!";
		string strBye = "Goodbye World!";
		//TextOut, the 4th param expects char*, and the 5th param is the number of characters to display
		//c_str() outputs the string as a char*, and length() returns the number of characters in the string
		TextOut(hdc, 20, fromTop, strHello.c_str(), strHello.length());
		fromTop += fontHeight; //Gets the height of the tallest character in the font, so the next line will start beneath it
		TextOut(hdc, 20, fromTop, strBye.c_str(), strBye.length());
		//Outputs the client area dimension information to the centre of the client area
		DrawText(hdc, buffer, -1, &clientArea, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
		
		EndPaint(hwnd, &ps);
		
	}
	else if (event == WM_CLOSE)
	{
		DestroyWindow(hwnd);
	}
	else if (event == WM_DESTROY)
	{
		PostQuitMessage(0);
	}
	else
	{
		return DefWindowProc(hwnd, event, object, params);
	}
	
	return 0;
	
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR args, int nCmdShow)
{	
	
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = mainEventListener;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(GetModuleHandle(NULL), MAKEINTRESOURCE(imgMainIcon));
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(GetStockObject(WHITE_BRUSH));
    wc.lpszMenuName = NULL;
    wc.lpszClassName = className;

    wc.hIconSm = (HICON)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(imgMainIcon), IMAGE_ICON, 16, 16, 0);

    if(!RegisterClassEx(&wc))
    {

        MessageBox(NULL, "Window Registration Failed!", "Error!", MB_OK | MB_ICONEXCLAMATION);
        return 0;
        
    }
    	
    hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,
    className,
    APP_TITLE,
    WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,
    CW_USEDEFAULT,
    APP_WIDTH,
    APP_HEIGHT,
    NULL,
    NULL,
    hInstance,
    NULL);

    if(hwnd == NULL)
    {
	    
        MessageBox(NULL, "Window Creation Failed!", "Error!", MB_OK | MB_ICONEXCLAMATION);        
        return 0;
        
    }
	
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

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