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 WindowsFormsApp11
{
    public partial class Form1 : Form
    {
        //public static Nullable<Boolean>[,] grid = new Nullable<Boolean>[3, 3];
        public static char[,] grid = new char[3, 3];
        public static char CURRENT = 'X';
        public static int x_wins = 0;
        public static int o_wins = 0;

        public static int W_UNIT;
        public static int H_UNIT;
        public static int X_BUFFER = 22;


        public Form1()
        {
            InitializeComponent();

            W_UNIT = Canvas.Width / 3;
            H_UNIT = Canvas.Height / 3;

            for (int i = 0; i < 3; i++)
                for (int j = 0; j < 3; j++)
                    grid[i, j] = ' ';
        }

        private void ClearGrid()
        {
            for (int i = 0; i < 3; i++)
                for (int j = 0; j < 3; j++)
                    grid[i, j] = ' ';

            CURRENT = 'X';
            Canvas.Refresh();
        }

        private void Canvas_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            // Draw the Board
            using (Pen myPen = new Pen(Color.Gold))
            {
                g.DrawLine(myPen, Canvas.Width / 3, 0, Canvas.Width / 3, Canvas.Height);
                g.DrawLine(myPen, (2 * Canvas.Width / 3), 0, (2 * Canvas.Width / 3), Canvas.Height);

                g.DrawLine(myPen, 0, Canvas.Height / 3, Canvas.Width, Canvas.Height / 3);
                g.DrawLine(myPen, 0, (2 * Canvas.Height / 3), Canvas.Width, (2 * Canvas.Height / 3));

                for (int i = 0; i < 3; i++)
                    for (int j = 0; j < 3; j++)
                    {
                        // Draw the X's and O's
                        if (grid[j, i] == 'X') // Then draw an X
                        {
                            // Top-left to bottom-right
                            g.DrawLine(myPen, (j * W_UNIT) + X_BUFFER, (i * Canvas.Height / 3) + X_BUFFER,
                                              W_UNIT + (j * Canvas.Width / 3) - X_BUFFER, H_UNIT + (i * Canvas.Height / 3) - X_BUFFER);
                            // Bottom-left to top-right
                            g.DrawLine(myPen, (j * W_UNIT) + X_BUFFER, H_UNIT + (i * Canvas.Height / 3) - X_BUFFER,
                                              W_UNIT + (j * W_UNIT) - X_BUFFER, (i * Canvas.Height / 3) + X_BUFFER);
                            /*
                            g.DrawLine(myPen, (j * Canvas.Width / 3), H_UNIT + (i * Canvas.Height / 3),
                                              W_UNIT + (j * Canvas.Width / 3), (i * Canvas.Height / 3));
                            */
                        }
                        else if (grid[j, i] == 'O')
                        {
                            g.DrawEllipse(myPen, (j * W_UNIT) + X_BUFFER, (i * Canvas.Height / 3) + X_BUFFER,
                                                 W_UNIT - (2 * X_BUFFER), H_UNIT - (2 * X_BUFFER));
                        }
                    }
            }
        }

        private void Canvas_MouseDown(object sender, MouseEventArgs e)
        {
            /*
             * We can now know where the user has clicked on the Board
            MessageBox.Show("[" + e.X / (Canvas.Width / 3) + ", " + 
                                  e.Y / (Canvas.Height / 3) + "]");
            */

            if (grid[e.X / (Canvas.Width / 3), e.Y / (Canvas.Height / 3)] == ' ')
                grid[e.X / (Canvas.Width / 3), e.Y / (Canvas.Height / 3)] = CURRENT;
            else
                return;

            if (CURRENT == 'X')
                CURRENT = 'O';
            else
                CURRENT = 'X';

            Canvas.Refresh();

            // X == 88
            // O == 79

            int sum = 0;
            // Checking for rows
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    sum += (int)grid[j, i];
                }

                if (sum == (88 *3))
                {
                    x_wins++;
                    MessageBox.Show("Huzzah, the X's have won!\n" + 
                                    "Current score: " + x_wins + " for X's\n" +
                                    "               " + o_wins + " for O's");
                    ClearGrid();
                }
                else if (sum == (79 * 3))
                {
                    o_wins++;
                    MessageBox.Show("Huzzah, the O's have won!\n" +
                                    "Current score: " + x_wins + " for X's\n" +
                                    "               " + o_wins + " for O's");
                    ClearGrid();
                }
                sum = 0;
            }
            // Checking for columns
            for (int i = 0; i < 3; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    sum += (int)grid[i, j];
                }

                if (sum == (88 * 3))
                {
                    x_wins++;
                    MessageBox.Show("Huzzah, the X's have won!\n" +
                                    "Current score: " + x_wins + " for X's\n" +
                                    "               " + o_wins + " for O's");
                    ClearGrid();
                }
                else if (sum == (79 * 3))
                {
                    o_wins++;
                    MessageBox.Show("Huzzah, the O's have won!\n" +
                                    "Current score: " + x_wins + " for X's\n" +
                                    "               " + o_wins + " for O's");
                    ClearGrid();
                }
                sum = 0;
            }
            // Checking for diagonals
            for (int i = 0; i < 3; i++)
            {
                sum += (int)grid[i, i];
            }

            if (sum == (88 * 3))
            {
                x_wins++;
                MessageBox.Show("Huzzah, the X's have won!\n" +
                                "Current score: " + x_wins + " for X's\n" +
                                "               " + o_wins + " for O's");
                ClearGrid();
            }
            else if (sum == (79 * 3))
            {
                o_wins++;
                MessageBox.Show("Huzzah, the O's have won!\n" +
                                "Current score: " + x_wins + " for X's\n" +
                                "               " + o_wins + " for O's");
                ClearGrid();
            }
            sum = 0;
            for (int i = 0; i < 3; i++)
            {
                sum += (int)grid[2 - i, i];
            }

            if (sum == (88 * 3))
            {
                x_wins++;
                MessageBox.Show("Huzzah, the X's have won!\n" +
                                "Current score: " + x_wins + " for X's\n" +
                                "               " + o_wins + " for O's");
                ClearGrid();
            }
            else if (sum == (79 * 3))
            {
                o_wins++;
                MessageBox.Show("Huzzah, the O's have won!\n" +
                                "Current score: " + x_wins + " for X's\n" +
                                "               " + o_wins + " for O's");
                ClearGrid();
            }
            sum = 0;

            /*
            int runningSum = (int)grid[0, 0] + (int)grid[1, 0] + (int)grid[2, 0];

            if (runningSum == (88 *3))
                // then X won
            else if (runningSum == (79 * 3))
                    // then O won
                    */

            /*
            if (grid[0, 0] == 'O' && grid[1, 0] == 'O' && grid[2, 0] == 'O')
                // then O won
                if (grid[0, 0] == 'X' && grid[1, 0] == 'X' && grid[2, 0] == 'X')
                    // then X won
                    */
        }

        private void Form1_ResizeEnd(object sender, EventArgs e)
        {
            Canvas.Width = this.Width - (13 * 2);
            Canvas.Height = this.Height - (13 * 2);

            W_UNIT = Canvas.Width / 3;
            H_UNIT = Canvas.Height / 3;

            Canvas.Refresh();
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            DialogResult dr;

            if (e.KeyCode == Keys.Escape)
            {
                dr = MessageBox.Show("Would you like to exit the program?", "Exiting Program", MessageBoxButtons.YesNo);

                if (dr == DialogResult.Yes)
                    Environment.Exit(0);
                // else, don't do anything
            }

            if (e.KeyCode == Keys.N && e.Control) // ctrl+N
            {
                dr = MessageBox.Show("Would you like to start a new game?", "New Game?", MessageBoxButtons.YesNo);

                if (dr == DialogResult.Yes)
                {
                    ClearGrid();
                }
            }
        }
    }
}