#include <iostream>
#include <fstream>
#include <windows.h>
#include <cstdlib>
#include <string>
#include <cmath>
#include <ctime>
#include <clocale>

using namespace std;

int main() {
    setlocale(LC_CTYPE, "Russian");
    int cp = GetConsoleCP();
    SetConsoleCP(1251);
    SetConsoleCP(cp);
    //SetConsoleOutputCP(1251);
    ifstream in("input.txt");
    ofstream out("output.txt");
    ofstream outKey("Key.txt");
    string CryptText, OpenText;
    string Alph = "абвгдеЄжзийклмнопрстуфхцчшщъыьэю€";
    int m = Alph.size();
    srand(time(NULL));
    int NumberRandomFirstSymbol;
    NumberRandomFirstSymbol = rand() % Alph.size();
    char RandomSymbol;
    RandomSymbol = Alph[NumberRandomFirstSymbol];
    cout << "RandomSymbol = " << RandomSymbol << endl;
    string key;
    key += RandomSymbol;
    while(!in.eof()) {
        string temp;
        getline(in, temp, '\t');
        OpenText += temp;
    }
    for(int i = 0; i < OpenText.size() - 1; i++) {
        if((OpenText[i] >= 'ј') && (OpenText[i] <= 'я')) {
            OpenText[i] += '€' - 'я';
        }
    }
    string FinalOpenText;
    for(int i = 0; i < OpenText.size(); i++) {
        for(int j = 0; j < Alph.size(); j++) {
            if(OpenText[i] == Alph[j]) {
                FinalOpenText += OpenText[i];
            }
        }
    }
    for(int i = 0; i < FinalOpenText.size() - 1; i++) {
        key += FinalOpenText[i];
    }
    outKey << RandomSymbol;
    cout << "Open Text:  " << FinalOpenText << endl;
    cout << "Key-Word:   " << key << endl;
    int first = 0, second = 0;
    int NumberSymbol = 0;
    for(int i = 0; i < FinalOpenText.size(); i++) {
        for(int j = 0; j < Alph.size(); j++) {
            if(FinalOpenText[i] == Alph[j]) {
                first = j;
            }
        }
        for(int j = 0; j < Alph.size(); j++) {
            if(key[i] == Alph[j]) {
                second = j;
            }
        }
        NumberSymbol = ((first + second) % m);
        CryptText += Alph[NumberSymbol];
    }
    cout << "Crypt Text: " << CryptText << endl;
    out << CryptText;
    in.close();
    out.close();
    outKey.close();
    system("pause");
    return 0;
}