/*
 * UFO.cs
 * Authors:     August Zinsser
 * 
 * Copyright Matthew Belmonte 2007
 */


using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using tAC_Engine;
using Pina3D.Particles;


namespace Astropolis
{
    /// <summary>
    /// Serves as the base class for any ship that comes out of a wormhole in the meteor madness game.
    /// Enforces that children have hitpoints, must react to getting hit by projectiles,
    /// can be destroyed, can collide with the player, and have a basic binary response (ie fire or don't fire)
    /// based on the orientation of itself and the player.
    /// </summary>
    class UFO : Entity
    {
        protected float mHitPoints = 100;       // Shield power. If this drops below 0, the UFO should die
        protected bool mAlive = true;           // Is it dead or not
        protected Vector3 mSpace3DSize;         // Size of this entity in space3D coordinates
        protected Emitter mShieldEmitter;       // Shield particle effect


        public bool Alive { set { mAlive = false; } get { return mAlive; } }
        public float HitPoints { set { mHitPoints = value; } get { return mHitPoints; } }
        public override float Width { set { mSpace3DSize.X = value; } get { return mSpace3DSize.X; } }
        public override float Height { set { mSpace3DSize.Y = value; } get { return mSpace3DSize.Y; } }
        public override Vector3 Size { get { return mSpace3DSize; } }


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="texture">Image of the ship</param>
        /// <param name="width">Width of the ship in Space3D coordinates</param>
        /// <param name="height">Space3D coordinates</param>
        /// <param name="depth">In Spacw3D units</param>
        /// <param name="hitPoints">Max damage to take before dying</param>
        public UFO(Texture2D texture, float width, float height, float depth, float hitPoints)
            : base(texture)
        {
            mSpace3DSize = new Vector3(width, height, depth);
            mHitPoints = hitPoints;
            mSize.Z = mSize.Y;
            mShieldEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\Shield.spx");
        }


        /// <summary>
        /// Basic AI function. Depending on the type of UFO, react should signal different actions
        /// based on its true/false return value
        /// </summary>
        /// <returns></returns>
        public virtual bool React(CheetahFighter playerShip) { return false; }


        /// <summary>
        /// Spawns the appropriate particle effects and/or entities
        /// </summary>
        public virtual void Destroy() { }


        /// <summary>
        /// Awards the appropriate resources or damages player
        /// </summary>
        public virtual void CollideWithPlayer(Entity player) { }


        /// <summary>
        /// Takes a hit from a photon
        /// </summary>
        public virtual void GetHit(int damage) { }
    }
}