using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;


namespace XNASnake
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        KeyboardState oldState = Keyboard.GetState();
        Snake.WhereToGo keyState;
        int time;
        Apple apple;
        private int appleTime;
        private bool drawApple;
        Character Tail;
        private Snake Head;
        private int ileKwadratow;
        SpriteFont sf;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            graphics.PreferredBackBufferHeight = 300;
            graphics.PreferredBackBufferWidth = 300;
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {

            base.Initialize();
        }

        protected override void LoadContent()
        {
            ileKwadratow = 0;
            Tail = new Character();
            time = 0;
            spriteBatch = new SpriteBatch(GraphicsDevice);
            apple = new Apple();
            apple.texture = Content.Load<Texture2D>("Snake/Apple");
            Head = new Snake(Content.Load<Texture2D>("Snake/SnakeRectangle"));
            Tail.wezykList.Add(Head);
            sf = Content.Load<SpriteFont>("SpriteFont1");
            Head.position = new Vector2(graphics.PreferredBackBufferWidth / 2, graphics.PreferredBackBufferHeight / 2);
            Head.velocity = new Vector2(5, 0);
        }

        protected override void UnloadContent()
        {

        }

        public void SnakeUpdate()
        {
            Head.position += Head.velocity;
        }



        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            KeyAdapter();
            CheckApple();

            time += gameTime.ElapsedGameTime.Milliseconds;
            appleTime += gameTime.ElapsedGameTime.Milliseconds;
            SnakeUpdate();

            foreach (Snake s in Tail.wezykList)
            {
                s.position = Head.position;
            }
            

            if (appleTime >= 6000 || apple.isDead == true)
            {
                drawApple = true;
                apple.X = new Random().Next(0, graphics.PreferredBackBufferWidth - apple.texture.Width);
                apple.Y = 200;
                appleTime -= 6000;
                apple.isDead = false;
            }

            base.Update(gameTime);
        }

        public void KeyAdapter()
        {
            KeyboardState currentState = Keyboard.GetState();

            if (currentState.IsKeyDown(Keys.Up) && oldState.IsKeyUp(Keys.Up))
            {
                keyState = Snake.WhereToGo.goUP;
                Head.velocity = new Vector2(0, -3);
            }

            if (currentState.IsKeyDown(Keys.Down) && oldState.IsKeyUp(Keys.Down))
            {
                keyState = Snake.WhereToGo.goDOWN;
                Head.velocity = new Vector2(0, 3);
            }
            
            if (currentState.IsKeyDown(Keys.Left) && oldState.IsKeyUp(Keys.Left))
            {
                keyState = Snake.WhereToGo.goLEFT;
                Head.velocity = new Vector2(-3, 0);
            }

            if (currentState.IsKeyDown(Keys.Right) && oldState.IsKeyUp(Keys.Right))
            {
                keyState = Snake.WhereToGo.goRIGHT;
                Head.velocity = new Vector2(3, 0);
            }
        }

        public void CheckApple()
        {
            if (apple.Rectanglee().Intersects(Tail.wezykList[0].Rectanglee()))
            {
                Snake dodatek = new Snake(Content.Load<Texture2D>("Snake/SnakeRectangle"));

                if (keyState == Snake.WhereToGo.goDOWN)
                {
                    dodatek.position.X = Tail.wezykList[ileKwadratow].position.X;
                    dodatek.position.Y = Tail.wezykList[ileKwadratow].position.Y - 10;
                }
                if (keyState == Snake.WhereToGo.goUP)
                {
                    dodatek.position.X = Tail.wezykList[ileKwadratow].position.X;
                    dodatek.position.Y = Tail.wezykList[ileKwadratow].position.Y + 10;
                }
                if (keyState == Snake.WhereToGo.goLEFT)
                {
                    dodatek.position.X = Tail.wezykList[ileKwadratow].position.X + 10;
                    dodatek.position.Y = Tail.wezykList[ileKwadratow].position.Y;
                }
                if (keyState == Snake.WhereToGo.goRIGHT)
                {
                    dodatek.position.X = Tail.wezykList[ileKwadratow].position.X - 10;
                    dodatek.position.Y = Tail.wezykList[ileKwadratow].position.Y;
                }


                apple.isDead = true;


                ileKwadratow++;
                Tail.wezykList.Add(dodatek);

            }
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            spriteBatch.Begin();

            //spriteBatch.Draw(sticzeq.wezykList[0].texture, sticzeq.wezykList[0].Rectanglee(), Color.Aqua);
            // rysowanie OK

            foreach (Snake s in Tail.wezykList)
            {
                spriteBatch.Draw(s.texture, s.Rectanglee(), Color.Aqua);
            }

            if (drawApple == true)
            {
                spriteBatch.Draw(apple.texture, apple.Rectanglee(), Color.Red);
            }

            spriteBatch.DrawString(sf,Convert.ToString(keyState),new Vector2(100,100),Color.Black);
            spriteBatch.DrawString(sf, Convert.ToString(Tail.wezykList.Count), new Vector2(100, 130), Color.Black);


            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}