#include <iostream>
#include <cstdlib>
#include <fstream>
#include <ctime>
#include <string>
#include <vector>

using namespace std;
const int TRIES = 5;

int letterFill(char, string, string&);

int main() {
    string name;
    char letter;
    int num_of_wrong_guesses = 0;
    string line;

    ifstream myfile("words.txt");
    vector<string> words;

    if (myfile.is_open()) {
        while (getline(myfile, line)) {
            words.push_back(line);
        }

        myfile.close();
    } else cout << "Unable to open file";

    size_t n = rand() % words.size();
    string word = words[n];
    //choose and copy a word from array of words randomly
    // Initialize the secret word with the * character.
    string unknown(word.length(), '*');
    // welcome the user
    cout << "\n\nWelcome to hangman!! Guess the word";
    cout << "\n\nYou have to type only one letter in one try.";
    cout << "\n\nYou have " << TRIES << " tries to try and guess the word.";
    cout << "\n*****************************************";
    // Loop until the guesses are used up
    while (num_of_wrong_guesses < TRIES) {
        cout << "\n\n" << unknown;
        cout << "\n\nGuess a letter: ";
        cin >> letter;
        if (letterFill(letter, word, unknown) == 0) {
            cout << endl << "Whoops! That letter isn't in there!" << endl;
            num_of_wrong_guesses++;
        } else {
            cout << endl << "You found a letter!" << endl;
        }
        // Tell user how many guesses has left.
        cout << "You have " << TRIES - num_of_wrong_guesses;
        cout << " guesses left." << endl;
        // Check if user guessed the word.
        if (word == unknown) {
            cout << word << endl;
            cout << "Yeah! You got it!";
            break;
        }
    }

    if (num_of_wrong_guesses == TRIES) {
        cout << "\nSorry, you lose." << endl;
        cout << "The word was : " << word << endl;
    }

    cin.ignore();
    cin.get();

    return 0;
}

int letterFill(char guess, string secretword, string &guessword) {
    int i;
    int matches = 0;
    int len = secretword.length();
    for (i = 0; i < len; i++) {
        if (guess == guessword[i])
            return 0;
        if (guess == secretword[i]) {
            guessword[i] = guess;
            matches++;
        }
    }
    return matches;
}