using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

using DW.Stream;

namespace DWGame.Player
{
    public class AI
    {
        //struct to hold fighter attributes
        public struct enemyFighter
        {
            public Vector2 position;
            public Texture2D enemyShip;
            public Rectangle enemyBox;
        }

        //struct used to hold missle attributes
        public struct missle
        {
            public Vector2 mPosition;
            public Rectangle mBox;
            public Texture2D mTex;
        }

        //instances of enemy and missle
        public static enemyFighter enemy;
        public static missle missle1;

        //lists to hold all the enemy fighters and their missles
        public static List<enemyFighter> enemies;
        public static List<missle> missles;
        
        //variables used to hold counter for elapsed time
        public static GameTime gametime;
        public static int timeCounter;

        //constructor
        public AI()
        {
            missle1 = new missle();
            missles = new List<missle>();
            enemy = new enemyFighter();
            enemies = new List<enemyFighter>();
            missle1.mTex = Renderer.content.Load<Texture2D>("ships/Missle");
            enemy.enemyShip = Renderer.content.Load<Texture2D>("ships/EnemyFighter");
            timeCounter = 0;
            gametime = new GameTime();
        }

        //method used to generate missles fired by enemies
        public static void fire(enemyFighter inFighter)
        {
                missle1.mPosition.X = (int)(inFighter.position.X - 30);
                missle1.mPosition.Y = (int)(inFighter.position.Y + 8);
                missle1.mBox = new Rectangle((int)missle1.mPosition.X, (int)missle1.mPosition.Y, (int)missle1.mTex.Width, (int)missle1.mTex.Height);
                missles.Add(missle1);   
        }

        //method used to pass missle list to Collision
        public static List<missle> getMissles()
        { return missles; }

        //method used to set missle list with updated list from Collision
        public static void setMissles()
        { missles = Collision.getEMissles(); }

        //method used to pass enemies list to Collision
        public static List<enemyFighter> getFighters()
        { return enemies; }

        //method used to update the positions of the enemy fighters and their missles
        public static void Update(int inCounter)
        {
            if (PhoenixGame.gameTimer.IsRunning)
            {
                timeCounter = (int)gametime.ElapsedGameTime.TotalSeconds;
                switch (inCounter)
                {
                    case 3:
                        if (enemies.Count < 1 && (timeCounter % 300 == 0))
                        {
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 200;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 275;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 350;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            Background.fgCounter = 0;
                        }
                        break;
                    case 4:
                        if (enemies.Count < 1 && (timeCounter % 300 == 0))
                        {
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 275;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 325;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            Background.fgCounter = 0;
                        }
                        break;
                    case 5:
                        if (enemies.Count < 1 && (timeCounter % 300 == 0))
                        {
                            enemy.position.X = (int)(750);
                            enemy.position.Y = 300;
                            enemy.enemyBox = new Rectangle((int)enemy.position.X, (int)enemy.position.Y, 50, 40);
                            enemies.Add(enemy);
                            Background.fgCounter = 0;
                        }
                        break;
                }

                for (int i = 0; i < enemies.Count; i++)
                {
                    enemyFighter temp = enemies[i];
                    temp.position.X = (int)temp.position.X - 1;
                    temp.enemyBox.X = (int)temp.position.X;
                    enemies[i] = temp;
                    Random rand = new Random();
                    int holder = rand.Next(100);
                    if (holder == 3)
                        AI.fire(enemies[i]);
                    if (enemies[i].position.X < 15)
                        enemies.RemoveAt(i);
                }

                for (int i = 0; i < missles.Count; i++)
                {
                    missle temp = missles[i];
                    temp.mPosition.X = (int)temp.mPosition.X - 5;
                    temp.mBox.X = (int)temp.mPosition.X;
                    missles[i] = temp;
                    if (missles[i].mPosition.X < 15)
                        missles.RemoveAt(i);
                }
            }
        }

        //method used to draw enemy fighters and their missles
        public static void Draw()
        {
            for (int i = 0; i < enemies.Count; i++)
            {
                Renderer.spriteBatch.Draw(enemies[i].enemyShip, enemies[i].enemyBox, Color.White);
            }
            for (int i = 0; i < missles.Count; i++)
            {
                Renderer.spriteBatch.Draw(missles[i].mTex, missles[i].mBox, Color.White);
            }

        }
    }
}