#region Using Statements
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;
#endregion

// Local using statements
using XNAEngine;
using CollisionDetection;
using LinearAlgebra;
//using Physics;

// Test Gun Class by Dr. Roger Webster and Dr. Gary Zoppetti
namespace XNACollisionDetection
{
    public class PrawnNade : CollidableModel
    {
        ParticleSystem explosionParticles;
        ParticleSystem explosionSmokeParticles;
        ParticleEmitter trailEmitter;

        const float trailParticlesPerSecond = 200;
        const int numExplosionParticles = 30;
        const int numExplosionSmokeParticles = 50;
        const float gravity = 15;

        #region Variables
        float life_span = 4;
        float age = 0;
        Vector3 explosion_velocity;

        private bool m_isVisible;
        bool m_alive;

        string homedir = System.IO.Directory.GetCurrentDirectory() + "/sounds/";

        Vector3 m_init_pos;
        Vector3 m_hide_pos;
        Vector3 m_pos;
        Direction m_direction;
        Quaternion m_rotation;
        Matrix4 world_transform;

        float m_gravity;
        float m_y_velocity;
        float m_fall_speed;

        float m_fwd_velocity;
        float m_angle_x;
        float m_angle_y;
        float m_angle_z;
        #endregion

        static Random random = new Random();

        public PrawnNade(Model model, ParticleSystem trail, ParticleSystem explosionSmokeParticles, ParticleSystem explosionParticles, Matrix4 worldTrans)
            : base(model)
        {
            #region InitVars
            m_alive = false;
            m_init_pos = Vector3.Zero;
            m_gravity = -0.01f;
            m_fall_speed = -2.0f;
            m_y_velocity = 0.0f;
            m_fwd_velocity = 0.0f;
            m_direction = Direction.Forward;
            m_angle_x = 1.0f;
            m_angle_y = 0.0f;
            m_angle_z = 0.0f;
            m_hide_pos.X = 0.0f;
            m_hide_pos.Y = -1000.0f;
            m_hide_pos.Z = 0.0f;
            world_transform = worldTrans;
            #endregion

            explosion_velocity.X = (float)(random.NextDouble() - 0.5);
            explosion_velocity.Y = (float)(random.NextDouble() + 0.5);
            explosion_velocity.Z = (float)(random.NextDouble() - 0.5);
            this.explosionParticles = explosionParticles;
            this.explosionSmokeParticles = explosionSmokeParticles;
            trailEmitter = new ParticleEmitter(trail, trailParticlesPerSecond, this.Position);
        }

        public void setVisible(bool visible)
        {
            m_isVisible = visible;
        }

        public Vector3 getPos()
        {
            Vector3 pos;
            pos.X = (float)m_pos.X;
            pos.Y = (float)m_pos.Y;
            pos.Z = (float)m_pos.Z;
            return (pos);
        }
        public void setPos(Vector3 pos)
        {
            m_pos.X = pos.X;
            m_pos.Y = pos.Y;
            m_pos.Z = pos.Z;
            this.Position = m_pos;
        }

        public new void Draw(Camera camera)
        {
            if (m_isVisible)
            {
                base.Draw(camera);
            }
        }

        public void Fire(Vector3 pos, Quaternion rot)
        {
            setVisible(true);
            m_alive = true;
            m_init_pos = pos;
            m_pos = pos;
            m_rotation = rot;
            m_fwd_velocity = 1.0f;
            m_y_velocity = 0.1f;
            this.Position = m_pos;
            this.Rotation = m_rotation;
            age = 0;
        }

        public void Update(GameTime gameTime)
        {
            float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
            age += elapsedTime;

            Vector3 prev_pos = this.Position;

            if(m_y_velocity > m_fall_speed)
                m_y_velocity += m_gravity;
            this.move(m_direction, m_fwd_velocity);
            this.moveWorld(world_transform.Up, m_y_velocity);

            if (m_alive)
                trailEmitter.Update(gameTime, this.Position);
            if (age > life_span)
            {
                this.Reset();
            }
        }

        public void Reset()
        {
            if (m_alive)
            {
                Sound explode_snd = new Sound(homedir + "weapons/rocket hit.wav", false);
                explode_snd.play();
                for (int i = 0; i < numExplosionParticles; i++)
                    explosionParticles.AddParticle(this.Position, explosion_velocity);
                for (int i = 0; i < numExplosionSmokeParticles; i++)
                    explosionSmokeParticles.AddParticle(this.Position, explosion_velocity);
                m_alive = false;
            }
            setVisible(false);
            m_fwd_velocity = 0.0f;
            this.Position = m_hide_pos;
        }
    }
}