#include <iostream>
#include <cstring>
#include <random>

//TODO Clean up parts of the output

//global variables
std::string playWord[]= {"hell", "slim", "wait", "game", "blue", "west", "blood"};
int attempts = 0;
std::string word;

//Prototype
bool checkWord(std::string &input, std::string &word);
void intro();
void play();
std::string getNewWord();
int bullCount(std::string &input, const char array[]);
int cowCount(std::string &input, const char array[]);


int main() {

    intro();
    play();
    return 0;


}

//Intro message
void intro(){
    std::cout << "Welcome to Bull & Cow!" << std::endl;
    std::cout << "A random word will be selected and you must guess it. " << std::endl;
    std::cout << "Bull: Correct letter in the correct position." << std::endl;
    std::cout << "Cow: Correct letter in the wrong position. " << std::endl;
    std::cout << "Enter 1 to exit" << std::endl;
}

//Random;ly selects a new word from playWord array
//TODO Avoid repeating words
std::string getNewWord(){

    static std::random_device rd;     // only used once to initialise (seed) engine
    static std::ranlux24_base rng(rd());    // random-number engine used (Mersenne-Twister in this case)
    static std::uniform_int_distribution<int> uni(0,(sizeof(playWord) / sizeof( playWord[0])) - 1); // guaranteed unbiased
    auto random_integer = uni(rng);
    std::string newWord = playWord[random_integer];
    return newWord;
}

//Main chunk of the game
void play(){
    std::string input;


    start:
        //Gets the word and informs user of length of the word
        word = getNewWord();
        std::cout << "The word is " << word.size() << " long." << std::endl;

        //Converts word into an array of char
        char wordArray[word.size() + 1];
        strncpy(wordArray, word.c_str(), word.size());
        wordArray[word.size()] = 0;


        //Loops the game till user gets the word or exit current word (1)
        do{
            std::cout <<"Enter your guess: " << std::endl;
            std::cin >> input;

            std::cout << "Debugg>> " << wordArray << std::endl;

            if(input == word){
                std::cout << "\nCongrats! You got it right" << std::endl;
                break;
            }
            else if (input == "1")
                break;
            else
                std::cout << "Bull: " << bullCount(input, wordArray) << " Cow: " << cowCount(input, wordArray) << std::endl;

        } while(true);
    std::cout << "Play again? Y or N " << std::endl;
    char again;
    std::cin >> again;
    if(again == 'y' || again == 'Y')
        goto start;
    else
        std::cout << "Thank you for playing!" << std::endl;


}

//Returns the bull count.
int bullCount(std::string &input, const char array[]){
    int bullCount = 0;
    //Converts user's input into a char array
    char inputArray[input.size()];
    strncpy(inputArray, input.c_str(), input.size());
    inputArray[input.size()] = 0;

    //Check to see if user's input matches the word and adds to bullcount
    for(int i = 0; i < input.size(); i++){
        if(inputArray[i] == array[i])
            bullCount++;

    }
    return bullCount;
}

//Returns the cow count
//Similar to bullcount function
int cowCount(std::string &input, const char array[]){
    int cowCount = 0;

    char inputArray[input.size()];
    strncpy(inputArray, input.c_str(), input.size());
    inputArray[input.size()] = 0;

    //Takes i char of user's input and loops through word array, adds to cowcount if there's a match
    for(int i = 0; i < input.size(); i++){
        for(int j = 0; j < input.size(); j++)
            if(input[i] == array[j])
                cowCount++;

    }

    return cowCount;
}