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 loginform
{
    public partial class SnakeGame : Form
    {
        private List<Circle> Snake = new List<Circle>();
        private Circle food = new Circle();
        public SnakeGame()
        {
            InitializeComponent();
            new Settings();
            gameTimer.Interval = 1000 / Settings.Speed;
            gameTimer.Tick += updateSreen;
            gameTimer.Start();
            startGame();
        }
        private void updateSreen(object sender, EventArgs e)
            {
                if (Settings.GameOver == true)
                { if (Input.KeyPress(Keys.Enter))
                    {
                    Settings.Score=0;

                    startGame();
                    ;
                        ;
                }
                }
                else
                {
                    if (Input.KeyPress(Keys.Right) && Settings.direction != Directions.Left)
                    { Settings.direction = Directions.Right; }
                    else if (Input.KeyPress(Keys.Left) && Settings.direction != Directions.Right)
                    { Settings.direction = Directions.Left; }
                    else if (Input.KeyPress(Keys.Up) && Settings.direction != Directions.Up)
                    { Settings.direction = Directions.Up; }
                    else if (Input.KeyPress(Keys.Down) && Settings.direction != Directions.Up)
                    { Settings.direction = Directions.Down; }
                    movePlayer();
                }
                pbCanvas.Invalidate();


            }
        private void movePlayer()
        {
            for (int i = Snake.Count-1; i<=0; i--)
            {
                if (i == 0)
                {
                    switch (Settings.direction)
                    {
                        case Directions.Right:
                            {
                                Snake[i].X++;
                                break;
                            }
                        case Directions.Left:
                            {
                                Snake[i].X--;
                                break;
                            }
                        case Directions.Up:
                            {
                                Snake[i].Y--;
                                break;
                            }
                        case Directions.Down:
                            {
                                Snake[i].Y++;
                                break;
                            }
                    }
                    int maxXpos = pbCanvas.Size.Width / Settings.Width;
                    int maxYpos = pbCanvas.Size.Height / Settings.Height;
                    if (
                        Snake[i].X < 0 || Snake[i].Y < 0 || Snake[i].X > maxXpos || Snake[i].Y > maxYpos)
                    { die(); }
                    for (int j = 1; j < Snake.Count; j++)
                    { if (Snake[i].X == Snake[j].X && Snake[i].Y == Snake[j].Y)
                          die(); }




                if (Snake[0].X == food.X && Snake[0].Y == food.Y)
                    eat(); }
                else
                {
                    //Snake[i].X = Snake[Snake.Count-1].X;
                    //Snake[i].Y = Snake[Snake.Count-1].Y;
                }
            }
        }
        private void keyisdown(object sender, KeyEventArgs e)
            {
                Input.changeState(e.KeyCode, true);
            }
        private void keyisup(object sender, KeyEventArgs e)
        {
            Input.changeState(e.KeyCode, false);

        }
        public void eat()
        {
            Circle body = new Circle
            {
                X = Snake[Snake.Count-1].X,
                Y = Snake[Snake.Count-1].Y

            };
            Snake.Add(body);
            Settings.Score += Settings.Points;
            label3.Text = Settings.Score.ToString();
            generateFood();
        }
        private void updateGraphics(object sender, PaintEventArgs e)
        {
            Graphics canvas = e.Graphics;
            if (Settings.GameOver == false)
            { Brush snakeColour;
                for (int i = 0; i < Snake.Count; i++)
                { if (i == 0)
                    { snakeColour = Brushes.Black; }
                    else
                    {
                        snakeColour = Brushes.Green;
                    }
                    canvas.FillEllipse(snakeColour, new Rectangle(
                        Snake[i].X * Settings.Width,
                        Snake[i].Y * Settings.Height,
                        Settings.Width, Settings.Height));
                    canvas.FillEllipse(Brushes.Red, new Rectangle(
                        food.X * Settings.Width,
                        food.Y * Settings.Height,
                        Settings.Width, Settings.Height));
                }
            }
            else
            {
                string gameOver = "Game Over \n" + "Final Score is " + Settings.Score + "\n Press enter to restart";
                label4.Text = gameOver;
                label4.Visible = true;
            }
        }
        private void SnakeGame_Load(object sender, EventArgs e)
        {

        }






        private void startGame()
        {
            label4.Visible = false;
            new Settings();
            Snake.Clear();
            Circle head = new Circle { X = 10, Y = 5 };
            Snake.Add(head);

            label3.Text = Settings.Score.ToString();
            generateFood();
        }
        private void generateFood()
        {
            int maxXpos = pbCanvas.Size.Width / Settings.Width;
            int maxYpos = pbCanvas.Size.Height / Settings.Height;
            Random rnd = new Random();
            food = new Circle { X = rnd.Next(0, maxXpos), Y = rnd.Next(0, maxYpos) };
        }

        private void die()
        {
            Settings.GameOver = true;
        }


        }
    }