/*
 * PhotonTorpedo.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.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Storage;
using Pina3D.Particles;
using tAC_Engine;


namespace Astropolis
{
    /// <summary>
    /// The lasers that the player fires at meteors or other ships
    /// </summary>
    class PhotonTorpedo : Entity
    {
        protected Emitter mTrailEmitter;      // Particle effect
        protected Emitter mHeadEmitter;       // ''
        protected float mSpawnDepth;          // Depth that the lasers spawn at (should be the same as the player ship)
        protected float mKillDepth;           // How far the laser travels before fizzling out
        protected bool mAlive = true;         // If the laser is alive or not
        protected bool mIsGoingAway;          // Used to determine whether the lasers are travelling away from the player or towards it
        protected bool mFriendly = true;      // Friendly lasers are fired from the player, non-friendly lasers can damage the player
        protected int mDamage = 0;            // How much damage is dealt to a ship that collides with this laser
        protected Vector3 mSpace3DSize;       // Size of this entity in space3D coordinates
        protected int mLevel = 0;             // Levels 1 and 2 look cooler

        public bool Friendly { set { mFriendly = value; } get { return mFriendly; } }
        public int Damage { set { mDamage = value; } get { return mDamage; } }
        public bool Alive { set { mAlive = value; mTrailEmitter.Alive = value; mHeadEmitter.Alive = value; } get { return mAlive; } }
        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; } }
        public virtual Vector3 CollisionSize { get { return mSpace3DSize; } }


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="clockwise">If the torpedo should rotate clockwise</param>
        /// <param name="color">Color of the photon</param>
        /// <param name="width">In Space3D units</param>
        /// <param name="height">In Space3D units</param>
        /// <param name="depth">In Spacw3D units</param>
        /// <param name="level">Level 0 is standard, levels 1 and 2 look cooler</param>
        /// <param name="speed">Space3D units/second</param>
        /// <param name="spawnDepth">Initial Z position</param>
        /// <param name="killDepth">Maximum Z position</param>
        public PhotonTorpedo(bool clockwise, Color color, int level, Vector3 spawnLocation, float width, float height, float depth, float speed, float spawnDepth, float killDepth)
            : base((Texture2D)null)
        {
            mSpace3DSize = new Vector3(width, height, depth);
            mLevel = level;
            mPos = spawnLocation;
            mVel.Z = speed;
            mSize.Z = width * 2;     // Extra width allows us to calculate collisions more cheaply
            mSpawnDepth = spawnDepth;
            mKillDepth = killDepth;

            // Load and move the particle effects
            mTrailEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\PhotonTorpedoTrail.spx");
            if (mLevel == 1)
            {
                mHeadEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\PhotonTorpedoSpinningHead.spx");
                mHeadEmitter.Position3D = new Vector3(0, -100, 0);
                mHeadEmitter.RegularEmissionType.Modifiers[0].InitialTint = Color.LightGoldenrodYellow;
                mHeadEmitter.RegularEmissionType.Modifiers[0].FinalTint = color;
                mTrailEmitter.RegularEmissionType.Modifiers[0].InitialTint = new Color(
                    (byte)(color.R + 128),
                    (byte)(color.G + 0),
                    (byte)(color.B - 32),
                    color.A);
                mTrailEmitter.RegularEmissionType.Modifiers[0].FinalTint = color;
                mTrailEmitter.RenderScale = 4f;
                mSpace3DSize.X *= 2f;
                mSpace3DSize.Y *= 2f;
            }
            else if (mLevel >= 2)
            {
                mHeadEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\PhotonTorpedoHead.spx");
                mHeadEmitter.Position3D = Vector3.Zero;
                mHeadEmitter.RegularEmissionType.Modifiers[0].InitialTint = Color.Orange;
                mHeadEmitter.RegularEmissionType.Modifiers[0].FinalTint = color;
                mHeadEmitter.RegularEmissionType.Modifiers[0].FinalScale *= 10f;

                mTrailEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\PhotonTorpedoTrail2.spx");
                mTrailEmitter.RegularEmissionType.Modifiers[0].InitialTint = color;
                mTrailEmitter.RegularEmissionType.Modifiers[0].FinalTint = Color.Orange;
                mVel.Z *= 2f;
                mSize.Z *= 2f;
                mSpace3DSize.X *= 2f;
                mSpace3DSize.Y *= 2f;
                mSpace3DSize.Z *= 2f;
            }
            else // Default
            {
                mHeadEmitter = Sparx.LoadParticleEffect(@"Content\Particle Effects\PhotonTorpedoHead.spx");
                mHeadEmitter.Position3D = Vector3.Zero;
                mHeadEmitter.RegularEmissionType.Modifiers[0].InitialTint = color;
                mHeadEmitter.RegularEmissionType.Modifiers[0].FinalTint = color;
                mTrailEmitter.RegularEmissionType.Modifiers[0].InitialTint = color;
                mTrailEmitter.RegularEmissionType.Modifiers[0].FinalTint = color;
                mTrailEmitter.RenderScale = 1f;
            }

            Rectangle proj = Space3D.Project(mPos.X, mPos.Y, mPos.Z, mSpace3DSize.X, mSpace3DSize.Y, -1f);
            mTrailEmitter.Position3D = new Vector3(proj.X, proj.Y, -mPos.Z / killDepth);
            Sparx.AddEmitter(mTrailEmitter);
            Sparx.AddEmitter(mHeadEmitter);

            if (speed > 0)
                mIsGoingAway = true;
            else
                mIsGoingAway = false;
        }
       

        /// <summary> 
        /// Scroll the torpedoes
        /// </summary>
        public override void Update()
        {
            base.Update();

            // Update the photon's position
            if (mIsGoingAway && mPos.Z > mKillDepth ||
                !mIsGoingAway && mPos.Z < mKillDepth)
                mAlive = false;

            // Adjust the Particles
            Rectangle proj = Space3D.Project(mPos.X, mPos.Y, mPos.Z, mSpace3DSize.X, mSpace3DSize.Y, -1f);
            float zDepth = mPos.Z / mSpawnDepth;
            if (mIsGoingAway)
                zDepth = mPos.Z / mKillDepth;
            float scale = 1 - zDepth;

            mTrailEmitter.Position3D = new Vector3(proj.X, proj.Y, MathHelper.Clamp(zDepth, 0f, 1f));
            mTrailEmitter.SpawnRate = (Math.Max(zDepth, 0f)) * .2f;
            mHeadEmitter.RenderScale = scale;
            if (mLevel == 1)
                mHeadEmitter.Transform = Matrix.CreateScale(scale * .20f) * Matrix.CreateTranslation(proj.X, proj.Y, MathHelper.Clamp(1 - scale, 0f, 1f));
            else
                mHeadEmitter.Transform = Matrix.CreateScale(scale) * Matrix.CreateTranslation(proj.X, proj.Y, MathHelper.Clamp(1 - scale, 0f, 1f));

            if (mIsGoingAway)
            {
                mTrailEmitter.RegularEmissionType.Modifiers[0].InitialOpacity = scale;
                mTrailEmitter.RegularEmissionType.Modifiers[0].FinalOpacity = scale;
                mHeadEmitter.RegularEmissionType.Modifiers[0].InitialOpacity = scale;
            }
            
            // Kill the particle effect if the torpedo dies
            if (!mAlive)
            {
                mTrailEmitter.Alive = false;
                mHeadEmitter.Alive = false;
            }
        }
    }
}