using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;

namespace GameProject
{
    /// <summary>
    /// A burger
    /// </summary>
    public class Burger
    {
        #region Fields

        // graphic and drawing info
        Texture2D sprite;
        Rectangle drawRectangle;

        // burger stats
        int health = 100;

        // shooting support
        bool canShoot = true;
        int elapsedCooldownMilliseconds = 0;

        // sound effect
        SoundEffect shootSound;

        #endregion

        #region Constructors

        /// <summary>
        ///  Constructs a burger
        /// </summary>
        /// <param name="contentManager">the content manager for loading content</param>
        /// <param name="spriteName">the sprite name</param>
        /// <param name="x">the x location of the center of the burger</param>
        /// <param name="y">the y location of the center of the burger</param>
        /// <param name="shootSound">the sound the burger plays when shooting</param>
        public Burger(ContentManager contentManager, string spriteName, int x, int y,
            SoundEffect shootSound)
        {
            LoadContent(contentManager, spriteName, x, y);
            this.shootSound = shootSound;
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets the collision rectangle for the burger
        /// </summary>
        public Rectangle CollisionRectangle
        {
            get { return drawRectangle; }
        }

        #endregion

        #region Public methods

        /// <summary>
        /// Updates the burger's location based on mouse. Also fires
        /// french fries as appropriate
        /// </summary>
        /// <param name="gameTime">game time</param>
        /// <param name="mouse">the current state of the mouse</param>
        public void Update(GameTime gameTime, MouseState mouse)
        {
            // burger should only respond to input if it still has health
            if (health > 0)
            {
                // move burger using mouse
                drawRectangle.X = mouse.X - drawRectangle.Width / 2;
                drawRectangle.Y = mouse.Y - drawRectangle.Height / 2;
            }
            // clamp burger in window
            if (drawRectangle.Y < 0)
            {
                // bounce off top
                drawRectangle.Y = 0;
            }
            else if ((drawRectangle.Y + drawRectangle.Height) > GameConstants.WindowHeight)
            {
                // bounce off bottom
                drawRectangle.Y = GameConstants.WindowHeight - drawRectangle.Height;
            }
            if (drawRectangle.X < 0)
            {
                // bounc off left
                drawRectangle.X = 0;
            }
            else if ((drawRectangle.X + drawRectangle.Width) > GameConstants.WindowWidth)
            {
                // bounce off right
                drawRectangle.X = GameConstants.WindowWidth - drawRectangle.Width;
            }

            // update shooting allowed
            if (canShoot == false)
            {
                elapsedCooldownMilliseconds += gameTime.ElapsedGameTime.Milliseconds;
            }
            if (elapsedCooldownMilliseconds > GameConstants.BurgerTotalCooldownMilliseconds)
            {
                canShoot = true;
                elapsedCooldownMilliseconds = 0;
            }

            if (health > 0 && mouse.LeftButton == ButtonState.Pressed && canShoot == true)
            {
                canShoot = false;

                Projectile projectile = new Projectile(ProjectileType.FrenchFries,
                    Game1.GetProjectileSprite(ProjectileType.FrenchFries),
                    drawRectangle.X + drawRectangle.Width / 2,
                    drawRectangle.Y - GameConstants.FrenchFriesProjectileOffset,
                    GameConstants.FrenchFriesProjectileSpeed * Convert.ToSingle(Math.Sin(-90)));

                Game1.AddProjectile(projectile);
            }

            if (mouse.LeftButton == ButtonState.Released)
            {
                canShoot = true;
            }
            // timer concept (for animations) introduced in Chapter 7

            // shoot if appropriate

        }

        /// <summary>
        /// Draws the burger
        /// </summary>
        /// <param name="spriteBatch">the sprite batch to use</param>
        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw( sprite, drawRectangle, Color.White );
        }

        #endregion

        #region Private methods

        /// <summary>
        /// Loads the content for the burger
        /// </summary>
        /// <param name="contentManager">the content manager to use</param>
        /// <param name="spriteName">the name of the sprite for the burger</param>
        /// <param name="x">the x location of the center of the burger</param>
        /// <param name="y">the y location of the center of the burger</param>
        private void LoadContent(ContentManager contentManager, string spriteName,
            int x, int y)
        {
            // load content and set remainder of draw rectangle
            sprite = contentManager.Load<Texture2D>(spriteName);
            drawRectangle = new Rectangle(x - sprite.Width / 2,
                y - sprite.Height / 2, sprite.Width,
                sprite.Height);
        }

        #endregion
    }
}