/*
 * Guess A Word (Hangman redux)
 * Create a GUI version. 
 * Turn visibility of different UI elements on and off when needed. Add a counter displaying the number of submitted failed guesses (including repeated ones). 
 * Use a fixed-width font for displaying a word being guessed. 
 */


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GuessAWord
{
    public partial class GuessAWordForm : Form
    {
        string[] words = { "TEST", "APPLES", "BASK", "NEOPHYTE", "BASTION", "I", "OSTENTATIOUS", "STALLION", "MASK", "FACADE", "MINIONS", "ELK", "FANTASTIC", "MYTH" };
        const bool ON = true;
        const bool OFF = false;
        int i, j;  // universal workhorse iterators
        string word;
        string guessedLetters;
        bool gameOver;
        int wrongGuesses;
        int guesses;
        string guess;
        bool goodGuess;
        bool isNewGuess;
        bool validEntry;
        string answerboard;

        char[] wordArray;
        char[] answerboardArray;

        //
        //
        //  form methods
        //
        //

        public GuessAWordForm()
        {
            InitializeComponent();

            // set label text constants
            welcomeLogoLbl.Text = "* * * * * * * * * *";
            wonLbl.Text = "CONGRATULATIONS!!";
            wonLblLine4.Text = "WELL DONE!!";
        }



        private void startBtn_Click(object sender, EventArgs e)
        {
            gameOver = false;
            wrongGuesses = 0;
            guesses = 0;
            guess = "";
            guessedLetters = "";
            goodGuess = false;
            validEntry = true;
            feedbackLbl.Text = "";

            word = SelectWord(0, words.Length - 1);

            wordArray = word.ToCharArray();

            answerboard = "";
            for (i = 0; i < word.Length; ++i)
                answerboard += "*";
            answerboardLbl.Text = answerboard;
            answerboardArray = answerboard.ToCharArray();

            if (welcomeLogoLbl.Visible == true)
                ToggleWelcomeScreen(OFF);
            if (wonLbl.Visible == true)
                ToggleWonScreen(OFF);
            ToggleGameUI(ON);
        }  // end startBtn_Click



        private void submitBtn_Click(object sender, EventArgs e)
        {
            guess = guessTxtbx.Text;
            goodGuess = false;

            validEntry = CheckLength(guess);
            if (validEntry)
                validEntry = CheckForLetter(guess);

            if (validEntry)
            {
                guess = EnsureUpper(guess);
                ++guesses;
               
                isNewGuess = CheckForNewGuess(guess);
                if (isNewGuess)
                {
                    guessedLetters += guess;

                    // check guess
                    for (i = 0; i < word.Length; ++i)
                    {
                        if (guess == word.Substring(i, 1))
                        {
                            feedbackLbl.Text = "Yes!!  " + guess + " is in the word!!";
                            for (j = 0; j < answerboard.Length; ++j)
                            {
                                if (guess == word.Substring(j, 1))
                                {
                                    answerboardArray[j] = Convert.ToChar(guess);
                                    answerboard = new string(answerboardArray);
                                    answerboardLbl.Text = answerboard;
                                }
                            }

                            i = word.Length; // force exit since a correct letter found
                            goodGuess = true;

                            if (answerboard == word)
                                gameOver = true;
                        } // end the if block that checks if good letter and what to do
                    }  // continue on to next letter in the word as needed

                    if (!goodGuess)
                    {
                        feedbackLbl.Text = "Sorry. " + guess + " is not in the word.";
                        ++wrongGuesses;  // increment wrong guesses counter
                    }
                } // end if for isNewGuess
                else // not a newGuess, but still incrememnt wrong guess counter
                    ++wrongGuesses;

                if (!gameOver)
                {
                    feedbackLbl.Text += "\n\nYou have made " + wrongGuesses + " wrong guess";
                    if (wrongGuesses != 1)
                        feedbackLbl.Text += "es.";
                    else
                        feedbackLbl.Text += ".";
                }
                else  // won
                {
                    wonLblLine2.Text = "You got it in only " + guesses + " guess";
                    if (guesses != 1)
                        wonLblLine2.Text += "es!!";
                    else
                        wonLblLine2.Text += "!!";

                    wonLblLine3.Text = "(And you did it with ";
                    if (wrongGuesses != 0)
                        wonLblLine3.Text += "only ";

                    wonLblLine3.Text += wrongGuesses + " wrong guess";

                    if (wrongGuesses != 1)
                        wonLblLine3.Text += "es!!)";
                    else
                        wonLblLine3.Text += "!!)";

                    ToggleGameUI(OFF);
                    ToggleWonScreen(ON);  // 
                } // end won code block

            } //end if validEntry 

            guessTxtbx.Text = ""; // reset the textbox
            guessTxtbx.Focus(); // force the focus back to the textbox as a convenience to the user
        }  // end submitBtn_Click


        //
        //
        // utility methods
        //
        //



        private void ToggleWelcomeScreen(bool onOff)
        {
            welcomeLogoLbl.Visible = onOff;
        }



        private void ToggleGameUI(bool onOff)
        {
            if (onOff == ON && wordLbl.Visible == false) //  keep these always on after first initialiation
            {
                wordLbl.Visible = onOff;
                answerboardLbl.Visible = onOff;
            }
            startBtn.Visible = !onOff;
            guessLbl.Visible = onOff;
            guessTxtbx.Visible = onOff;
            feedbackLbl.Visible = onOff;
            submitBtn.Visible = onOff;
            if (onOff == ON)
                guessTxtbx.Focus(); // force the focus to the textbox as a convenience to the user
        }  // end ToggleGameUI()



        private void ToggleWonScreen(bool onOff)
        {
            wonLbl.Visible = onOff;
            wonLblLine2.Visible = onOff;
            wonLblLine3.Visible = onOff;
            wonLblLine4.Visible = onOff;
            playAgainLbl.Visible = onOff;
        }



        private string SelectWord(int min, int max)
        {
            Random ranNumberGenerator = new Random();
            int randomNumber;
            randomNumber = ranNumberGenerator.Next(min, max);
            string newWord = words[randomNumber];
            return newWord;
        }



        private bool CheckForNewGuess(string newGuess) // check if guessed already
        {
            bool validGuess = true;

            for (i = 0; i < guessedLetters.Length; ++i)
            {
                if (newGuess == guessedLetters.Substring(i, 1))
                {
                    feedbackLbl.Text = "You already guessed " + newGuess + ".";
                    i = guessedLetters.Length; // result found; end loop
                    validGuess = false;
                }
            }

            return validGuess;
        }  // end CheckForNewGuess()



        private bool CheckLength(string newGuess)
        {
            bool isValidLength = true;
            if (newGuess.Length > 1)
            {
                feedbackLbl.Text = "Invalid entry. Please enter only one letter.";
                isValidLength = false;
            }
            return isValidLength;
        }



        private bool CheckForLetter(string newGuess)
        {
            bool isLetter = false;
            if (String.Compare(newGuess, "a") >= 0 && String.Compare(newGuess, "z") <= 0)
                isLetter = true;
            else if (String.Compare(newGuess, "A") >= 0 && String.Compare(newGuess, "Z") <= 0)
                isLetter = true;
            else feedbackLbl.Text = "Invalid entry. Please enter only letters from A-Z";

            return isLetter;
        }



        private string EnsureUpper(string newGuess)
        {
            if (String.Compare(newGuess, "a") >= 0 && String.Compare(newGuess, "z") <= 0)
                newGuess = newGuess.ToUpper();
            return newGuess;
        }

    }  // end class GuessAWord form
}  // end namespace GuessAWord