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;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;

namespace Pressure
{

    public class Game1 : Microsoft.Xna.Framework.Game
    {


        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Texture2D player;
        Vector2 pos = Vector2.Zero;
        Vector2 playersp = new Vector2(50.0f, 50.0f);
        Texture2D road1;
        Texture2D road2;
        Texture2D brickwall;
        Texture2D floor1;
        Texture2D floor2;
        Texture2D floor3;
        Texture2D grass;
        Texture2D sidewalk1;
        Texture2D wood;
        Texture2D road3;
        private Vector2 origin;
        KeyboardState currentState;
        Camera camera = new Camera();

        Vector2 motion;

        List<Texture2D> tiles = new List<Texture2D>();

        static int tileWidth = 64;
        static int tileHeight = 64;

        int tileMapWidth;
        int tileMapHeight;

        static int screenWidth;
        static int screenHeight;

        static int mapWidthInPixels;
        static int mapHeightInPixels;
        int[,] map = {
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 5, 6, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 7, 5, 6, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 1, 1, 1, 2, 2, 1, 8, 7, 5, 6, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 1, 1, 1, 2, 2, 1, 8, 7, 5, 5, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 1, 1, 1, 1, 1, 1, 8, 7, 5, 5, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 1, 3, 3, 3, 1, 1, 8, 7, 5, 6, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 8, 8, 1, 1, 8, 8, 8, 8, 7, 5, 6, 5, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 6, 5, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,},
              {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,},
              {9, 9, 9, 5, 5, 9, 9, 9, 5, 5, 9, 9, 9, 5, 5, 5, 5, 5, 9, 9, 9, 5, 5, 9, 9, 9, 5, 5, 9,},
              {5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,},
              {7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
              {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,},
                     };
        public static int ScreenWidth
        {
            get { return screenWidth; }
        }

        public static int ScreenHeight
        {
            get { return screenHeight; }
        }

        public static int MapWidthInPixels
        {
            get { return mapWidthInPixels; }
        }

        public static int MapHeightInPixels
        {
            get { return mapHeightInPixels; }
        }
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }


        protected override void Initialize()
        {

            base.Initialize();
        }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            player = Content.Load<Texture2D>("haz");
            origin.X = player.Width /2;
            origin.Y = player.Height /2;
            grass = Content.Load<Texture2D>("grass");
            floor1 = Content.Load<Texture2D>("floor1");
            floor2 = Content.Load<Texture2D>("floor2");
            floor3 = Content.Load<Texture2D>("floor3");
            wood = Content.Load<Texture2D>("wood");
            road1 = Content.Load<Texture2D>("road1");
            road2 = Content.Load<Texture2D>("road2");
            sidewalk1 = Content.Load<Texture2D>("sidewalk1");
            brickwall = Content.Load<Texture2D>("brickwall");
            road3 = Content.Load<Texture2D>("road3");
            tiles.Add(grass); //0
            tiles.Add(floor1);//1
            tiles.Add(floor2);//2
            tiles.Add(floor3);//3
            tiles.Add(wood);//4
            tiles.Add(road1);//5
            tiles.Add(road2);//6
            tiles.Add(sidewalk1);//7
            tiles.Add(brickwall);//8
            tiles.Add(road3);//9

            tileMapWidth = map.GetLength(1);
            tileMapHeight = map.GetLength(0);

            mapWidthInPixels = tileMapWidth * tileWidth;
            mapHeightInPixels = tileMapHeight * tileHeight;

            screenWidth = GraphicsDevice.Viewport.Width;
            screenHeight = GraphicsDevice.Viewport.Height;
           }


        protected override void UnloadContent()
        {
             }
        private float RotationAngle;
        private float oldx;
        private float oldy;

        protected override void Update(GameTime gameTime)
        {
            oldx = playersp.X;
            oldy = playersp.Y;
    currentState = Keyboard.GetState();
   pos = playersp;

            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            IsMouseVisible = true;


            MouseState Mouses = Mouse.GetState();
            Vector2 mouseLook = new Vector2(Mouses.X, Mouses.Y);

            motion = Vector2.Zero;
            Vector2 direction = (playersp ) - mouseLook;
            float angle = (float)(Math.Atan2(direction.Y, direction.X));

            RotationAngle = angle ;
            if (currentState.IsKeyDown(Keys.W))
            {
                if (playersp.Y > screenHeight  /4)
                {
                    playersp.Y = playersp.Y - 1;

                }
                else
                {
                    ScrollUp();

                }
            }
            if (currentState.IsKeyDown(Keys.A))
            {
                if (playersp.X > screenWidth / 4)
                {

                        playersp.X = playersp.X - 1;

                }
                else
                {
                    ScrollLeft();


                }
            }
            if (currentState.IsKeyDown(Keys.S))
            {
                if (playersp.Y > screenHeight / 1.5f)
                {
                    ScrollDown();
                }else{
                    playersp.Y = playersp.Y + 1;
                }

            }
            if (currentState.IsKeyDown( Keys.D))
            {

                if (playersp.X > screenWidth / 1.5f)
                {

                    ScrollRight();
                }
                else
                {
                    playersp.X = playersp.X + 1;

                }

            }
            if (motion != Vector2.Zero)
            {
                motion.Normalize();

                camera.Position += motion * camera.Speed;
            }

            base.Update(gameTime);
        }

        private void ScrollUp()
        {
            motion.Y = -0.5f;
        }

        private void ScrollRight()
        {
            motion.X = 0.5f;
        }

        private void ScrollDown()
        {
            motion.Y = 0.5f;
        }

        private void ScrollLeft()
        {
            motion.X = -0.5f;
        }

        private Point VectorToCell(Vector2 vector)
        {
            return new Point(
                        (int)(vector.X / tileWidth),
                        (int)(vector.Y / tileHeight));
        }

        private Vector2 ViewPortVector()
        {
            return new Vector2(
                    screenWidth + tileWidth,
                    screenHeight + tileHeight);
        }


        protected override void Draw(GameTime gameTime)
        {

            GraphicsDevice.Clear(Color.CornflowerBlue);
            DrawMap();




            base.Draw(gameTime);

        }

        private void DrawMap()
        {
            Point cameraPoint = VectorToCell(camera.Position);
            Point viewPoint = VectorToCell(camera.Position +
                                ViewPortVector());

            Point min = new Point();
            Point max = new Point();

            min.X = cameraPoint.X;
            min.Y = cameraPoint.Y;
            max.X = (int)Math.Min(viewPoint.X, map.GetLength(1));
            max.Y = (int)Math.Min(viewPoint.Y, map.GetLength(0));

            Rectangle tileRectangle = new Rectangle(
                    0,
                    0,
                    tileWidth,
                    tileHeight);

            spriteBatch.Begin();

            for (int y = min.Y; y < max.Y; y++)
            {
                for (int x = min.X; x < max.X; x++)
                {
                    tileRectangle.X = x * tileWidth - (int)camera.Position.X;
                    tileRectangle.Y = y * tileHeight - (int)camera.Position.Y;

                    spriteBatch.Draw(tiles[map[y, x]],
                        tileRectangle,
                        Color.White);
                    spriteBatch.Draw(player, pos, null, Color.White, RotationAngle,
      origin, 1.0f, SpriteEffects.None, 0f);
                }
            }

            spriteBatch.End();
        }

    }
}