// Crypter 1Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Crypter 1.h"
#include "Crypter 1Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CCrypter1Dlg dialog

CCrypter1Dlg::CCrypter1Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCrypter1Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCrypter1Dlg)
	m_strInput = _T("");
	m_strOutput = _T("");
	m_bOnlyAlpha = FALSE;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCrypter1Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCrypter1Dlg)
	DDX_Text(pDX, IDC_INPUT, m_strInput);
	DDX_Text(pDX, IDC_OUTPUT, m_strOutput);
	DDX_Check(pDX, IDC_ONLYALPHA, m_bOnlyAlpha);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCrypter1Dlg, CDialog)
	//{{AFX_MSG_MAP(CCrypter1Dlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_ENCRYPT, OnEncrypt)
	ON_BN_CLICKED(IDC_DECRYPT, OnDecrypt)
	ON_BN_CLICKED(IDC_ONLYALPHA, OnOnlyalpha)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCrypter1Dlg message handlers

BOOL CCrypter1Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// 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
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// 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 CCrypter1Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (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 to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CCrypter1Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

int CCrypter1Dlg::KeepInBounds(int CurCharacter)
{
	int OverloadBuffer = 0;
	while(CurCharacter > 'Z' || CurCharacter < 'A')
	{
		if(CurCharacter > 'Z')
		{
			OverloadBuffer = CurCharacter - 'Z';
			CurCharacter = ('A'-1)+OverloadBuffer;
		}
		else if(CurCharacter < 'A')
		{
			OverloadBuffer = 'A' - CurCharacter;
			CurCharacter = ('Z'+1)-OverloadBuffer;
		}
	}
	return CurCharacter;
}

int	GetAlphaCharacters(CString m_strInput)
{
	int numAlphaChars = 0;
	int curChar;
	m_strInput.MakeUpper();
	for(int i=0;i<m_strInput.GetLength();i++)
	{
		curChar=m_strInput.GetAt(i);
		if(curChar >= 'A' && curChar <= 'Z')
			numAlphaChars++;
	}
	return numAlphaChars;
}

bool GetCase(int CurCharacter)
{
	if(CurCharacter >= 'A' && CurCharacter <= 'Z')
		return true;
	return false;
}

int ReturnCase(int CurCharacter, bool isUpper)
{
	if(isUpper)
		return toupper(CurCharacter);
	return tolower(CurCharacter);
}

int GetModifier(CString TheString, int index)
{
	int LastAlpha = 0;
	TheString.MakeUpper();
	while(LastAlpha < 'A' || LastAlpha > 'Z')
	{
		index--;
		LastAlpha=TheString.GetAt(index);
	}
	return LastAlpha-('A'-1);
}

void CCrypter1Dlg::OnEncrypt() 
{
	UpdateData(TRUE);
	m_strOutput = _T("");
	int		InputLength = m_strInput.GetLength();
	int 	CurCharacter = 0;
	int		OverloadBuffer = 0;
	int		Modifier = 0;
	bool	isUpper=false;
	int		NumAlpha=GetAlphaCharacters(m_strInput);\
	int		CurNum=1;

	//Encrypt First Character
	CurCharacter=m_strInput.GetAt(0);
	isUpper=GetCase(CurCharacter);
	CurCharacter=toupper(CurCharacter);
	if(CurCharacter >= 'A' && CurCharacter <= 'Z')
	{
		if(m_bOnlyAlpha)
			CurCharacter=CurCharacter+NumAlpha;
		else
			CurCharacter=CurCharacter+InputLength;
		if(CurCharacter > 'Z')
			CurCharacter=KeepInBounds(CurCharacter);
	}
	CurCharacter=ReturnCase(CurCharacter, isUpper);
	m_strOutput += CurCharacter;
	
	//Do The Rest
	for(int i=1; i<InputLength;i++)
	{
		CurCharacter=m_strInput.GetAt(i);
		isUpper=GetCase(CurCharacter);
		CurCharacter=toupper(CurCharacter);
		if(CurCharacter >= 'A' && CurCharacter <= 'Z')
		{
			Modifier = GetModifier(m_strOutput, i);
			if(CurNum%2)
			{
				CurCharacter=CurCharacter+Modifier;
				CurCharacter=KeepInBounds(CurCharacter);
			}
			else
			{
				CurCharacter=CurCharacter-Modifier;
				CurCharacter=KeepInBounds(CurCharacter);
			}
			CurNum++;
		}
		CurCharacter=ReturnCase(CurCharacter, isUpper);
		m_strOutput += CurCharacter;
	}
	UpdateData(FALSE);

}

void CCrypter1Dlg::OnDecrypt() 
{
	UpdateData(TRUE);
	m_strOutput = _T("");
	int		InputLength = m_strInput.GetLength();
	int		CurCharacter = 0;
	int		OverloadBuffer = 0;
	int		Modifier = 0;
	bool	isUpper=false;
	int		NumAlpha=GetAlphaCharacters(m_strInput);
	int		CurNum=1;

	//Encrypt First Character
	CurCharacter=m_strInput.GetAt(0);
	isUpper=GetCase(CurCharacter);
	CurCharacter=toupper(CurCharacter);
	if(CurCharacter >= 'A' && CurCharacter <= 'Z')
	{
		if(m_bOnlyAlpha)
			CurCharacter=CurCharacter-NumAlpha;
		else
			CurCharacter=CurCharacter-InputLength;
		if(CurCharacter < 'A')
			CurCharacter=KeepInBounds(CurCharacter);
	}
	CurCharacter=ReturnCase(CurCharacter, isUpper);
	m_strOutput += CurCharacter;

	//Do The Rest

	for(int i=1; i<InputLength;i++)
	{
		CurCharacter=m_strInput.GetAt(i);
		isUpper=GetCase(CurCharacter);
		CurCharacter=toupper(CurCharacter);
		if(CurCharacter >= 'A' && CurCharacter <= 'Z')
		{
			Modifier = GetModifier(m_strInput, i);
			if(CurNum%2)
			{
				CurCharacter=CurCharacter-Modifier;
				CurCharacter=KeepInBounds(CurCharacter);
			}
			else
			{
				CurCharacter=CurCharacter+Modifier;
				CurCharacter=KeepInBounds(CurCharacter);
			}
			CurNum++;
		}
		CurCharacter=ReturnCase(CurCharacter, isUpper);
		m_strOutput += CurCharacter;
	}
	
	UpdateData(FALSE);
}

void CCrypter1Dlg::OnOnlyalpha() 
{
	UpdateData(TRUE);	
}