/*
 * USBDOS: USB DOS bootable stick creation utility
 * Copyright (c) 2011 Pete Batard <pete@akeo.ie>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <windows.h>
#include <windowsx.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <commctrl.h>

#include "msapi_utf8.h"
#include "resource.h"
#include "usbdos.h"

/*
 * Globals
 */
HINSTANCE main_instance;

/*
 * Main dialog callback
 */
static INT_PTR CALLBACK main_callback(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message) {

	case WM_DEVICECHANGE:
		return (INT_PTR)TRUE;

	case WM_INITDIALOG:
		return (INT_PTR)TRUE;

	case WM_COMMAND:
		switch(LOWORD(wParam)) {
		case IDC_CLOSE:
			PostQuitMessage(0);
			break;
		default:
			return (INT_PTR)FALSE;
		}
		return (INT_PTR)TRUE;

	case WM_CLOSE:
		PostQuitMessage(0);
		break;

	}
	return (INT_PTR)FALSE;
}

/*
 * Center a dialog with regards to the main application Window or the desktop
 */
void CenterDialog(HWND hDialog)
{
	POINT Point;
	HWND hParent;
	RECT DialogRect;
	RECT ParentRect;
	int nWidth;
	int nHeight;

	// Get the size of the dialog box.
	GetWindowRect(hDialog, &DialogRect);

	// Get the parent
	hParent = GetParent(hDialog);
	if (hParent == NULL) {
		hParent = GetDesktopWindow();
	}
	GetClientRect(hParent, &ParentRect);

	// Calculate the height and width of the current dialog
	nWidth = DialogRect.right - DialogRect.left;
	nHeight = DialogRect.bottom - DialogRect.top;

	// Find the center point and convert to screen coordinates.
	Point.x = (ParentRect.right - ParentRect.left) / 2;
	Point.y = (ParentRect.bottom - ParentRect.top) / 2;
	ClientToScreen(hParent, &Point);

	// Calculate the new x, y starting point.
	Point.x -= nWidth / 2;
	Point.y -= nHeight / 2 + 35;

	// Move the window.
	MoveWindow(hDialog, Point.x, Point.y, nWidth, nHeight, FALSE);
}

/*
 * Application Entrypoint
 */
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	HANDLE mutex = NULL;
	HWND hDlg = NULL;
	MSG msg;

	// Prevent 2 applications from running at the same time
	mutex = CreateMutexA(NULL, TRUE, "Global/USBDOS");
	if ((mutex == NULL) || (GetLastError() == ERROR_ALREADY_EXISTS))
	{
		MessageBoxA(NULL, "Another USBDOS application is running.\n"
			"Please close the first application before running another one.",
			"Other instance detected", MB_ICONSTOP);
		return 0;
	}

	// Save instance of the application for further reference
	main_instance = hInstance;

	// Initialize COM for folder selection
	CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

	// Create the main Window
	if ( (hDlg = CreateDialogA(hInstance, MAKEINTRESOURCEA(IDD_DIALOG), NULL, main_callback)) == NULL ) {
		MessageBoxA(NULL, "Could not create Window", "DialogBox failure", MB_ICONSTOP);
		goto out;
	}
	CenterDialog(hDlg);
	ShowWindow(hDlg, SW_SHOWNORMAL);
	UpdateWindow(hDlg);

	// Do our own event processing
	while(GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

out:
	CloseHandle(mutex);

	return 0;
}