#include<iostream>
#include<Windows.h>
#include<fstream>
#include<string>
#include<time.h>

using namespace std;

char litere[26];
int ocupat[26], auxi;
double frecventa[26],frecventa_n[26];

    HANDLE hConsole;

string plain_t,crypto_t;

string read_from_file()
{
    ifstream f("textdecript.txt");
    if (!f.is_open())
    {
        return "EROARE! Fisierul nu exista";
    }
    string text_original, aux;
    while (!f.eof())
    {
        f >> aux;
        text_original += aux;
    }
    f.close();
    return text_original;
}

string convert_to_plain(string text_original)
{
    string plaintext;

    for (unsigned temp = 0; temp < text_original.size(); temp++)
        if(text_original[temp] >= 65 && text_original[temp] <= 90)
            plaintext += text_original[temp];
        else
            if(text_original[temp] >= 97 && text_original[temp] <= 122)
                plaintext += (text_original[temp] - 32);

    return plaintext;
}

int esteocupat(int pozitie)
{
    if( ocupat[pozitie] == 0 )
    {ocupat[pozitie] = 1;
    return 1;}
    else return 0;
}

void gener()
{
    srand(unsigned int (time(NULL)));

    int salt = 26;
    int i = 0;

    while(salt > 0)
    {
        auxi = rand()%26;
        if( esteocupat(auxi) == 1)
        {
            litere[i] = auxi + 65;
            i++;
            salt--;
        }
    }
}

string convert(string plaintext)
{
    string converted;

    for (unsigned temp = 0; temp < plaintext.size(); temp++)
        converted += litere[((int) plaintext[temp]) - 65];

    return converted;
}

void frecv(string cryptotext)
{
    for (unsigned temp = 0; temp < cryptotext.size(); temp++)
        frecventa[cryptotext[temp]-65] += 1;
}

void frecv_n(string plaintext)
{
    for (unsigned temp = 0; temp < plaintext.size(); temp++)
        frecventa_n[plaintext[temp]-65] += 1;
}

void afish(string text_a)
{
    for (unsigned temp = 0; temp < text_a.size(); temp++)
        if(text_a[temp] == 'E')
        {
            SetConsoleTextAttribute(hConsole, 9);
            cout<<text_a[temp];
        }

        else

        {
            SetConsoleTextAttribute(hConsole, 7);
            cout<<text_a[temp];
        }
}



void main()
{
    hConsole = GetStdHandle(STD_OUTPUT_HANDLE);

    gener();

    for(int j=0;j<26;j++)
        cout<<"__"<<char(65+j)<<"__ : __"<<litere[j]<<"__"<<endl;

    plain_t = convert_to_plain(read_from_file());
    crypto_t = convert(plain_t);

    cout<<endl<<"================================================="<<endl<<endl<<"PLAIN TEXT:"<<endl<<endl;

    cout<<plain_t<<endl;

    cout<<endl<<"================================================="<<endl<<endl<<"CRYPT TEXT:"<<endl<<endl;

    afish(crypto_t);

    SetConsoleTextAttribute(hConsole, 7);

    frecv(crypto_t);
    frecv_n(plain_t);

    for(int j=0;j<26;j++)
        cout<<"__"<<char(65+j)<<"__ : __"<<frecventa_n[j]/plain_t.size()*100<<"__][ __"<<frecventa[j]/crypto_t.size()*100<<"__"<<endl;

    system("pause");

}