using System;
 using System.Collections.Generic;
 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.Net;
 using Microsoft.Xna.Framework.Storage;
 
 namespace XNAtutorial
 {
     public struct PlayerData
     {
         public Vector2 Position;
         public bool IsAlive;
         public Color Color;
         public float Angle;
         public float Power;
     }
 
     public class Game1 : Microsoft.Xna.Framework.Game
     {
         GraphicsDeviceManager graphics;
         SpriteBatch spriteBatch;
         GraphicsDevice device;
 
         int screenWidth;
         int screenHeight;
 
         Texture2D backgroundTexture;
         Texture2D foregroundTexture;
         Texture2D carriageTexture;
         Texture2D cannonTexture;
         Texture2D rocketTexture;
         SpriteFont font;
 
         PlayerData players;
         int numberOfPlayers = 4;
         float playerScaling;
         int currentPlayer = 0;
 
         bool rocketFlying = false;
         Vector2 rocketPosition;        
         Vector2 rocketDirection;
         float rocketAngle;
         float rocketScaling = 0.1f;
 
         public Game1()
         {
             graphics = new GraphicsDeviceManager(this);
             Content.RootDirectory = "Content";
         }
 
         protected override void Initialize()
         {
             graphics.PreferredBackBufferWidth = 500;
             graphics.PreferredBackBufferHeight = 500;
             graphics.IsFullScreen = false;
             graphics.ApplyChanges();
             Window.Title = "Riemer's 2D XNA Tutorial";
 
             base.Initialize();
         }
 
         protected override void LoadContent()
         {
             device = graphics.GraphicsDevice;
             spriteBatch = new SpriteBatch(device);
 
             screenWidth = device.PresentationParameters.BackBufferWidth;
             screenHeight = device.PresentationParameters.BackBufferHeight;
 
 
            backgroundTexture = Content.Load ("background");
            foregroundTexture = Content.Load ("foreground");
            carriageTexture = Content.Load ("carriage");
            cannonTexture = Content.Load ("cannon");
            rocketTexture = Content.Load ("rocket");
            font = Content.Load ("myFont");
            SetUpPlayers();
            playerScaling = 40.0f / (float)carriageTexture.Width;
        }
 
        private void SetUpPlayers()
        {
            Color playerColors = new Color[10];
            playerColors[0] = Color.Red;
            playerColors[1] = Color.Green;
            playerColors[2] = Color.Blue;
            playerColors[3] = Color.Purple;
            playerColors[4] = Color.Orange;
            playerColors[5] = Color.Indigo;
            playerColors[6] = Color.Yellow;
            playerColors[7] = Color.SaddleBrown;
            playerColors[8] = Color.Tomato;
            playerColors[9] = Color.Turquoise;
 
            players = new PlayerData[numberOfPlayers];
            for (int i = 0; i < numberOfPlayers; i++)
            {
                players[i].IsAlive = true;
                players[i].Color = playerColors[i];
                players[i].Angle = MathHelper.ToRadians(90);
                players[i].Power = 100;                
            }
 
            players[0].Position = new Vector2(100, 193);
            players[1].Position = new Vector2(200, 212);
            players[2].Position = new Vector2(300, 361);
            players[3].Position = new Vector2(400, 164);
        }
 
        protected override void UnloadContent()
        {
        }
 
        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();
 
            ProcessKeyboard();
 
             UpdateRocket();
 
             base.Update(gameTime);
         }
 
         private void ProcessKeyboard()
         {
             KeyboardState keybState = Keyboard.GetState();
             if (keybState.IsKeyDown(Keys.Left))
                 players[currentPlayer].Angle -= 0.01f;
             if (keybState.IsKeyDown(Keys.Right))
                 players[currentPlayer].Angle += 0.01f;
 
             if (players[currentPlayer].Angle > MathHelper.PiOver2)
                 players[currentPlayer].Angle = -MathHelper.PiOver2;
             if (players[currentPlayer].Angle < -MathHelper.PiOver2)
                 players[currentPlayer].Angle = MathHelper.PiOver2;
 
             if (keybState.IsKeyDown(Keys.Down))
                 players[currentPlayer].Power -= 1;
             if (keybState.IsKeyDown(Keys.Up))
                 players[currentPlayer].Power += 1;
             if (keybState.IsKeyDown(Keys.PageDown))
                 players[currentPlayer].Power -= 20;
             if (keybState.IsKeyDown(Keys.PageUp))
                 players[currentPlayer].Power += 20;
 
             if (players[currentPlayer].Power > 1000)
                 players[currentPlayer].Power = 1000;
             if (players[currentPlayer].Power < 0)
                 players[currentPlayer].Power = 0;
 
             if (keybState.IsKeyDown(Keys.Enter) || keybState.IsKeyDown(Keys.Space))
             {
                 rocketFlying = true;
                 rocketPosition = players[currentPlayer].Position;
                 rocketPosition.X += 20;
                 rocketPosition.Y -= 10;
                 rocketAngle = players[currentPlayer].Angle;
                 Vector2 up = new Vector2(0, -1);
                 Matrix rotMatrix = Matrix.CreateRotationZ(rocketAngle);
                 rocketDirection = Vector2.Transform(up, rotMatrix);
                 rocketDirection *= players[currentPlayer].Power / 50.0f;
             }
         }
 
         private void UpdateRocket()
         {
             if (rocketFlying)
             {
                 Vector2 gravity = new Vector2(0, 1);
                 rocketDirection += gravity / 10.0f;
                 rocketPosition += rocketDirection;
                 rocketAngle = (float)Math.Atan2(rocketDirection.X, -rocketDirection.Y);
             }
         }
 
         protected override void Draw(GameTime gameTime)
         {
             graphics.GraphicsDevice.Clear(Color.CornflowerBlue);
 
             spriteBatch.Begin();
             DrawScenery();
             DrawPlayers();
             DrawText();
             DrawRocket();
             spriteBatch.End();
 
             base.Draw(gameTime);
         }
 
         private void DrawScenery()
         {
             Rectangle screenRectangle = new Rectangle(0, 0, screenWidth, screenHeight);
             spriteBatch.Draw(backgroundTexture, screenRectangle, Color.White);
             spriteBatch.Draw(foregroundTexture, screenRectangle, Color.White);
         }
 
         private void DrawPlayers()
         {
             foreach (PlayerData player in players)
             {
                 if (player.IsAlive)
                 {
                     int xPos = (int)player.Position.X;
                     int yPos = (int)player.Position.Y;
                     Vector2 cannonOrigin = new Vector2(11, 50);
 
                     spriteBatch.Draw(cannonTexture, new Vector2(xPos + 20, yPos - 10), null, p
layer.Color, player.Angle, cannonOrigin, playerScaling, SpriteEffects.None, 1);
                     spriteBatch.Draw(carriageTexture, player.Position, null, player.Color, 0, 
new Vector2(0, carriageTexture.Height), playerScaling, SpriteEffects.None, 0);
                 }
             }
         }
 
         private void DrawText()
         {
             PlayerData player = players[currentPlayer];
             int currentAngle = (int)MathHelper.ToDegrees(player.Angle);
             spriteBatch.DrawString(font, "Cannon angle: " + currentAngle.ToString(), new Vecto
r2(20, 20), player.Color);
             spriteBatch.DrawString(font, "Cannon power: " + player.Power.ToString(), new Vecto
r2(20, 45), player.Color);
         }
 
         private void DrawRocket()
         {
             if (rocketFlying)
                 spriteBatch.Draw(rocketTexture, rocketPosition, null, players[currentPlayer].C
olor, rocketAngle, new Vector2(42, 240), 0.1f, SpriteEffects.None, 1);
         }
     }
 }