#include <iostream>
#include <vector>
#include <fstream>

using namespace std;
string chiffre(string cleartext, int cle)
{
    string cryptext{""};
    int val{0};

    for(int i{0}; i < cleartext.size(); i++)
    {
        if((cleartext[i] + cle) > 126)
        {
            val = ((cleartext[i] + cle) % 127) + 32;
        cryptext.push_back(char(val));
        }
        else
        {
            cryptext.push_back(char(cleartext[i] + cle));
        }
    }
    return cryptext;
}
string dechiffre(string cryptext, int cle)
{
    string cleartext{""};
    int val{0};
    for(int i{0}; i < cryptext.size(); i++)
    {
        if((cryptext[i] - cle) < 32)
        {
            val = (95 + (cryptext[i] - cle));
            while(val < 32)
            {
            val = (95 + (val));
            }
            if(val < 0)
            {
            val = val * -1;
            cleartext.push_back(char(val));
            }
            else
            {
            cleartext.push_back(char(val));
            }
        }
        else
        {
            cleartext.push_back(char(cryptext[i] - cle));
        }
    }
    return cleartext;
}
void filetociph(string filename, int cle)
{
    string ligne;
    string temp;
    ifstream fin(filename);
    while(getline(fin, ligne))
    {
        ofstream fout("ciph1.txt", ios::app);
        temp = chiffre(ligne, cle);
        fout << temp << endl;

    }
}
void ciphfiletotext(string filename, int cle)
{
    string ligne;
    string temp;
    ifstream fin(filename);
    while(getline(fin, ligne))
    {
        ofstream fout("text1.txt", ios::app);
        temp = dechiffre(ligne, cle);
        fout << temp << endl;

    }
}
void unknowkey(string filename)
{
    string ligne;
    string temp;

    ofstream fout("unknowtext.txt", ios::app);

    for(int i{1}; i < 95; i++)
    {

        ifstream fin(filename);

        fout << endl;
        fout << i;
        fout << endl;
    while(getline(fin, ligne))
    {
        temp = dechiffre(ligne, i);
        fout << temp << endl;

    }
    fout << "\n\n\n";
    fin.close();
    }
}
int main()
{
    filetociph("C:\\Users\\Z.GHANMI\\Desktop\\caesreer\\text.txt", 50);
    ciphfiletotext("C:\\Users\\Z.GHANMI\\Desktop\\caesreer\\ciph1.txt", 50);
    unknowkey("C:\\Users\\Z.GHANMI\\Desktop\\caesreer\\ciph1.txt");
return 0;
}