/************************************************
Author: 
Title: hangman.cpp
Description:
Usage:
*************************************************/

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



using namespace std;
void drawHangmanDamageStage (int stage);
string randomFileLine(string filename,int fileLines);

int main()
{
    //Name request 
    cout << "Please enter only your first name" << endl;
    string playername;
    cin >> playername;
    
    //Print welcome message
    cout << playername << ", we are going to play a game. The game is..." << endl;
    cout << "\n \n \t \t HUNTER HANGMAN \n \n" << endl;

    //Main menu options to quit or play 
    cout << "\t \t Play [play] \n \t \t Exit [exit] \n \t \t \n Please type your choice."<<endl;
    string menuoption;
    cin >> menuoption;
    
    
    if (menuoption == "play" || menuoption == "Play")
    {
        string word;
        //Asks for a difficulty and gets the secret word 
        //from the corresponding difficulty text file
        bool difficultySelected = false;
        while (difficultySelected == false)
        {    
            string difficulty;
            cout << "Please type a difficulty level [easy, medium, hard]:" << endl;
            cin >> difficulty; 
            if (difficulty == "easy" || difficulty == "Easy")
            {    
                word = randomFileLine("easy.txt", 16);
                difficultySelected = true;
            }
            else if (difficulty == "medium" || difficulty == "Medium")
            {
                word = randomFileLine("medium.txt", 21);
                difficultySelected = true;
            }
            else if (difficulty == "hard" || difficulty == "Hard")
            {
                word = randomFileLine("medium.txt" , 23);
                difficultySelected = true;
            }
            else
                continue;    
        }
        string wordcopyforlose = word;
        string guess;
        string display ;
        //Generates the hangman gameboard
        for (int t = 0;t < word.size()-1;t++)
        {
            string puzzlepart = "_ ";
            display.append(puzzlepart);
        }
        //Sets the word and the gameboard onto the same indices
        for (int q = 0;q < display.size()-1;q++)
        {
            q++;
            string padding =" ";
            word.insert(q,padding);
        }
        int wrong = 0;
        int correct = 0;
        //Main Game loop
        while (true)
        {    
            drawHangmanDamageStage(wrong);
            cout << "Guess a letter\n"<< display <<"\n Your Guess: ";
            cin >> guess;
            if (guess.size() < 2 )
            {
                if (word.find(guess) != -1)
                {
                    while (word.find(guess) != -1)
                    {
                        int indexnumber = word.find(guess);
                        display[indexnumber] = word[indexnumber];
                        string empty= " ";
                        word [indexnumber] = empty[0];
                        correct++;
                    }
                    //Informs player of victory and ends the game 
                    if (correct == (word.size()-1)*.5)
                    {
                        cout << display;
                        cout << "\n \n \t \t You've won! \n \n" << endl;
                        break; 
                    }
                }
                //Informs player of his defeat and ends the game
                else if (wrong > 5)
                {
                    drawHangmanDamageStage(wrong);
                    cout << playername << "...." << endl;
                    cout << "\n \n \t \t You have lost... \n \n" << endl;
                    cout << "\n \n The word was : " <<wordcopyforlose << endl;
                    break;
                }
                //catches incorrect and duplicate guesses.
                else
                {
                cout << guess <<" is not part of the word or was already guessed" << endl;
                wrong++;
                }
            }
            //Catches all input greater than 1 character 
            else 
            {    
                cout << "Invalid input. You may try again." << endl;
            }
        }
    }
    else 
        cout << "Looks like you don't want to play Hangman. Bye" << endl;
    return 0;
}

string randomFileLine(string filename, int fileLines )
{
    fstream file;
    file.open (filename.c_str() );
    string lineArray [(fileLines)];

    string line;
    int lastLineScanned = 0;    
    
    //Loads each line into an array
    while (file.good() )
    {
        getline (file,line);
        lineArray[lastLineScanned] = line;
        lastLineScanned++;
    }
    file.close();
    
    string randomLineString;
    // Generates a random valid index number to randomly pick a line
    srand( time (NULL) );
    randomLineString =  lineArray[rand()%(lastLineScanned-1)];
    return randomLineString ;
}
void drawHangmanDamageStage (int stage) 
{
    switch (stage)
    {
        case 0:
            cout << "___________\n|\t|\n|\t\n|        \n|\n" << endl;
            break;
        case 1:
            cout << "___________\n|\t|\n|\tO\n|        \n|\n" << endl;
            break;
        case 2:
            cout << "___________\n|\t|\n|\tO\n|       |\n|\n" << endl;
            break;
        case 3:
            cout << "___________\n|\t|\n|\tO\n|      [|\n|\n" << endl;
            break;
        case 4:
            cout << "___________\n|\t|\n|\tO\n|      [|]\n|\n" << endl;
            break;
        case 5:
            cout << "___________\n|\t|\n|\tO\n|      [|]\n|      / \n" << endl;
            break;
        default:
            cout << "___________\n|\t|\n|\tO\n|      [|]\n|      / \\\n" << endl;
    }
}