// ExampleDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Example.h"
#include "ExampleDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CExampleDlg dialog




CExampleDlg::CExampleDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CExampleDlg::IDD, pParent)
	, m_strPassword(_T(""))
	, m_strData(_T(""))
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CExampleDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EDIT_PASSWORD, m_strPassword);
	DDX_Text(pDX, IDC_EDIT_DATA, m_strData);
}

BEGIN_MESSAGE_MAP(CExampleDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_BUTTON_LOAD, &CExampleDlg::OnBnClickedButtonLoad)
	ON_BN_CLICKED(IDC_BUTTON_SAVE, &CExampleDlg::OnBnClickedButtonSave)
END_MESSAGE_MAP()


// CExampleDlg message handlers

BOOL CExampleDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CExampleDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CExampleDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CExampleDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}


void CExampleDlg::OnOK()
{
	//	If we're in the password box, set the password and enable controls.
	if(GetFocus() == GetDlgItem(IDC_EDIT_PASSWORD))
	{
		//	Update dialog data.
		UpdateData();

		//	Set the password.
		m_crypto.DeriveKey(m_strPassword);

		//	Disable the password control, enable the others.
		GetDlgItem(IDC_EDIT_PASSWORD)->EnableWindow(FALSE);
		GetDlgItem(IDC_EDIT_DATA)->EnableWindow();
		GetDlgItem(IDC_BUTTON_SAVE)->EnableWindow();
		GetDlgItem(IDC_BUTTON_LOAD)->EnableWindow();

		//	Set the focus to the data control.
		GetDlgItem(IDC_EDIT_DATA)->SetFocus();
	}
	else
		CDialog::OnOK();
}

void CExampleDlg::OnBnClickedButtonLoad()
{
	UpdateData();

	//	Show a file open dialog.
	CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, _T("Encrypted Data (*.dat)|*.dat||"), this);
	if(dlg.DoModal() == IDOK)
	{
		//	Create a byte array to store the file data.
		CByteArray arData;

		//	Load the file into the byte array.
		CFile file;
		if(file.Open(dlg.GetPathName(), CFile::modeRead) == FALSE)
		{
			AfxMessageBox(_T("Couldn't open file."));
			return;
		}

		//	Size the array to accomodate the file bytes.
		arData.SetSize(static_cast<INT_PTR>(file.GetLength()));

		//	Copy the data and close the file.
		file.Read(arData.GetData(), static_cast<UINT>(file.GetLength()));
		file.Close();

		//	Try and deserialize the data.
		if(m_crypto.Decrypt(arData, m_strData) == false)
			AfxMessageBox(_T("Coudln't decrypt data- check password."));
		else
			UpdateData(FALSE);
	}
}

void CExampleDlg::OnBnClickedButtonSave()
{
	UpdateData();

	//	Show a file save dialog.
	CFileDialog dlg(FALSE, _T("dat"), _T("Encrypted Data"), OFN_HIDEREADONLY, _T("Encrypted Data (*.dat)|*.dat||"), this);
	if(dlg.DoModal() == IDOK)
	{
		//	Create a byte array to store the data.
		CByteArray arData;

		//	Write the data to the array.
		if(m_crypto.Encrypt(m_strData, arData) == false)
		{
			AfxMessageBox(_T("Couldn't encrypt data."));
			return;
		}

		//	Save the data to disk.
		CFile file;
		if(file.Open(dlg.GetPathName(), CFile::modeCreate | CFile::modeWrite) == FALSE)
		{
			AfxMessageBox(_T("Couldn't open file."));
			return;
		}

		file.Write(arData.GetData(), static_cast<UINT>(arData.GetCount()));
		file.Flush();
		file.Close();

		m_strData = _T("");
		UpdateData(FALSE);

	}
}