using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace CarFire
{
    /// <summary>
    /// This class is responsible for controlling what draws to the screen when the game is running.
    /// </summary>
    public class Display
    {
        List<Projectile> mProjectiles = new List<Projectile>();
        List<IPlayer> mCharacters = new List<IPlayer>();
        Map mMap;
        int currentCenterX = 5;
        int currentCenterY = 5;
        public Display()
        {
            /*
            mMap = aMap;
            mCharacters = characters;
             */
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        public void LoadContent(ContentManager contentManager)
        {
            Texture2D everything = contentManager.Load<Texture2D>("cs");
            mMap = contentManager.Load<Map>("Maps/stable");
            Map.DefaultTile = contentManager.Load<Texture2D>("default");
            mMap.CenterCell = new Vector2(currentCenterX,currentCenterY);
            //Debugging... Spawn eight projectiles.
            //Diagonals
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(5,5), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(-5, 5), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(5, -5), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(-5, -5), 10, 10, 300, 300));
            //Vertical and horizontal
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(0, 5), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(-5, 0), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(5, 0), 10, 10, 300, 300));
            mProjectiles.Add(new Projectile(mMap, everything, new Vector2(0, -5), 10, 10, 300, 300));

            
            // TODO: use this.Content to load your game content here
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        public void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        public void Update(TimeSpan timespan)
        {

            for (int i = 0; i < mProjectiles.Count; i++ )
            {
                mProjectiles[i].Update(timespan);
                if (!mMap.IsCellOpen(new Point(mProjectiles[i].GridX, mProjectiles[i].GridY)))
                {
               
                    mProjectiles.RemoveAt(i);
                    i--;
                }
            }
            //Check for collisons
            for (int j = 0; j < mCharacters.Count; j++) 
            {
                for (int i = 0; i < mProjectiles.Count; i++)
                {
                    if (mProjectiles[i].GridX == mCharacters[j].GridX && mProjectiles[i].GridY == mCharacters[j].GridY)
                    {
                        //Debug - not sure if you can remove while doing for each
                        //Alternative - while loop, and decrement projectile counter if projectile is removed.
                        mProjectiles.Remove(mProjectiles[i]);
                        mCharacters[j].causeDamageTo(mProjectiles[i].Damage);
                    }
                }
            }
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="spriteBatch">Used to draw with</param>
        public void Draw(SpriteBatch spriteBatch)
        {
            mMap.Draw(spriteBatch);
            foreach(Projectile projectile in mProjectiles)
            {
                //Debug - follow a projectile to make sure following is working.
                if (mProjectiles.IndexOf(projectile) == 6)
                    mMap.CenterCell = new Vector2(projectile.GridX, projectile.GridY);
                projectile.Draw(spriteBatch);
                
            }
            foreach(IPlayer character in mCharacters)
            {
                character.Draw(spriteBatch);
            } 
        }

        public void AddCharacters(IPlayer player)
        {
            mCharacters.Add(player);
        }
    }
}