#include "cryptclasscaesar.h"

const int CryptClassCaesar::lowerBound = 0x30;
const int CryptClassCaesar::upperBound = 0x7A;

CryptClassCaesar::CryptClassCaesar()
{
    oldKey = -1;
    buildMap();
}

CryptClassCaesar::~CryptClassCaesar()
{

}

void CryptClassCaesar::encrypt()
{
    qDebug("CryptClassCaesar::encrypt");
    buildMap();

    QByteArray tmp = getClearText();

    for (int i = 0; i < tmp.size(); i++)
    {
        tmp[i] = substitutionsMap[tmp[i]];
    }

    setCryptText((unsigned char*) tmp.data(), tmp.size());

}

void CryptClassCaesar::decrypt()
{
    qDebug("CryptClassCaesar::encrypt");
}

void CryptClassCaesar::buildMap()
{
    if (oldKey == getKey().toInt())
    {
        return;
    }

    oldKey = getKey().toInt();

    substitutionsMap.clear();

    for (int i = 0; i < (upperBound - lowerBound); i++)
    {
        substitutionsMap.insert((char)(lowerBound + i),
                                (char)(lowerBound + (i + oldKey) % (upperBound - lowerBound)));

    }
}