using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace JogoRusso
{
    public partial class MainForm : Form
    {
        const int BUTTON_COUNT = 16;
        int SQUARE_ROOT = Convert.ToInt32(Math.Sqrt(BUTTON_COUNT));
        int PART_COUNT = 2 * Convert.ToInt32(Math.Sqrt(BUTTON_COUNT)) + 1;

        Button[] btn = new Button[BUTTON_COUNT];
        Label lbl;

        public MainForm()
        {
            this.Left = 0;
            this.Top = 0;
            this.MaximizeBox = false;
            this.FormBorderStyle = FormBorderStyle.Fixed3D;
            this.Text = "Jogo de Lógica";

            for (int i = 0; i < BUTTON_COUNT; ++i)
            {
                btn[i] = new Button();
                btn[i].Width = this.ClientSize.Width / PART_COUNT;
                btn[i].Height = this.ClientSize.Height / PART_COUNT;
                
                btn[i].Left = this.ClientSize.Width / PART_COUNT
                    + (2 * (i % SQUARE_ROOT) * this.ClientSize.Width / PART_COUNT);

                btn[i].Top = this.ClientSize.Height / PART_COUNT
                    + (2 * (i / SQUARE_ROOT) * this.ClientSize.Height / PART_COUNT);

                btn[i].BackColor = Color.SeaGreen;
                btn[i].Text = Convert.ToString(i + 1);

                btn[i].Click += new EventHandler(btn_Click);
                btn[i].Tag = 0;

                this.Controls.Add(btn[i]);
            }

            lbl = new Label();
            lbl.Width = this.ClientSize.Width;
            lbl.Text = "Todos os botões devem ficar vermelhos!";
            this.Controls.Add(lbl);

            InitializeComponent();
        }

        void btn_Click(object sender, EventArgs e)
        {
            int i = Convert.ToInt32(((Button)sender).Text) - 1;

            ChangeButtonState(i); // botão pressionado

            ChangeButtonState((i / SQUARE_ROOT) * SQUARE_ROOT
                + ((i + 1) % SQUARE_ROOT)); // botão da direita

            ChangeButtonState((i / SQUARE_ROOT) * SQUARE_ROOT
                + ((i + SQUARE_ROOT - 1) % SQUARE_ROOT)); // esquerda

            ChangeButtonState((i + SQUARE_ROOT) % BUTTON_COUNT); // abaixo
            ChangeButtonState((i - SQUARE_ROOT + BUTTON_COUNT) % BUTTON_COUNT); // acima

            if (CheckForWin())
                WonTheGame();
        }

        void ChangeButtonState(int i)
        {
            if (Convert.ToInt32(btn[i].Tag) == 0)
            {
                btn[i].Tag = 1;
                btn[i].BackColor = Color.Red;
            }
            else
            {
                btn[i].Tag = 0;
                btn[i].BackColor = Color.SeaGreen;
            }
        }

        bool CheckForWin()
        {
            for (int i = 0; i < BUTTON_COUNT; i++)
            {
                if (Convert.ToInt32(btn[i].Tag) == 0)
                {
                    return false;
                }
            }

            return true;
        }

        void WonTheGame()
        {
            lbl.Text = "Parabéns!";

            for (int i = 0; i < BUTTON_COUNT; i++)
            {
                btn[i].Click -= new EventHandler(btn_Click);
            }
        }
    }
}