#include <windows.h>
#include <stdio.h>
#include "heat.h"

BOOL CALLBACK digHeatEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM lParam);

BOOL CALLBACK digHeatEventListener (HWND hwnd, UINT event, WPARAM object, LPARAM lParam)
{

	if (event == WM_INITDIALOG)
	{
		
		HWND handleCbox = GetDlgItem(hwnd, cboxFrom);
		
		SendMessage(handleCbox, CB_ADDSTRING, 0, (LPARAM)(LPCTSTR)"Celius");
		SendMessage(handleCbox, CB_ADDSTRING, 0, (LPARAM)(LPCTSTR)"Fahrenheight");
		SendMessage(handleCbox, CB_SETCURSEL, 0, 0);
		
		SetDlgItemText(hwnd, txtAmount, "32");
		
	}
	else if (event == WM_COMMAND)
	{
		
		int objectID = LOWORD(object);	
		
		if (objectID == cmdConvert)
		{
			
			BOOL success;
    		int amount = GetDlgItemInt(hwnd, txtAmount, &success, 0);
    		
    		if (!success)
    		{
	    		MessageBox(hwnd, "Please only enter numeric amounts", "Invalid Data", MB_OK | MB_ICONEXCLAMATION);
    		}
    		else if (amount > 3000)
    		{
	    		MessageBox(hwnd, "Too hot, too hot!", "Burning up", MB_OK | MB_ICONEXCLAMATION);
    		}
    		else
    		{	    		
			
				HWND handleCbox = GetDlgItem(hwnd, cboxFrom);
				char answer[10];
				
				if (SendMessage(handleCbox, CB_GETCURSEL, 0, 0) == 0)
				{					
					sprintf(answer, "%4.2f*F", (amount * 1.8 + 32));					
				}
				else
				{					
					sprintf(answer, "%4.2f*C", ((amount - 32) / 1.8));
				}
				
				SetDlgItemText(hwnd, lblAnswer, answer);
				
			}
				
		}
		else if (objectID == cmdClose)
		{
			EndDialog(hwnd, objectID);
		}		
		
	}
	else if (event == WM_CLOSE)
	{		
		EndDialog(hwnd, object);
	}
	else
	{
		return false;
	}
	
	return true;

}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR args, int nCmdShow)
{
	return DialogBox(hInstance, MAKEINTRESOURCE(digHeat), NULL, digHeatEventListener);
}