using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using SynthySound;
using System.Linq;
using EvilSatellites.Objects;
using DavyKager;
using EvilSatellites.Quadtree;

namespace EvilSatellites.Screens
{
    public class GameScreen : IScreen
    {
        public ScreenManager Manager { get; set; }
        public ScreenState State { get; set; }
        private InputManager Input = new InputManager();
        public List<IGameObject> Objects = new List<IGameObject>();
        public List<IGameObject> Removable = new List<IGameObject>();
        public List<IGameObject> Addable = new List<IGameObject>();
        private Quadtree<IGameObject> objtree = new Quadtree<IGameObject>(new Vector3(10000, 10000, 10000), 10, 20);
        private float Theta = 0;
        private Player _player;
        private Radar ObjectRadar;
        public void Activate()
        {
            State = ScreenState.Active;
            Player player = new Player(this);
            Objects.Add(player);
            _player = player;
            Satellite prop = new Satellite(this, new Vector3(15, 0, 15));
            Objects.Add(prop);
            if (_player == null) Environment.Exit(1);
            ObjectRadar = new Radar(_player, this);
            return;
        }

        public void Deactivate()
        {
            State = ScreenState.Hidden;
            return;
        }

        public void Update(GameTime gameTime)
        {
            foreach (var obj in Removable)
            {
                Objects.Remove(obj);
            }
            if (Addable.Count > 0)
            {
                foreach (var obj in Addable)
                {
                    Objects.Add(obj);
                }
                Addable.Clear();
            }
            Removable.Clear();
            objtree.Clear();
            foreach (var obj            in Objects)
            {
                obj.Update(gameTime);
                objtree.Add(obj);
                if (obj.Type == ObjectType.Player)
                {
                    Manager.Sound.ListenerPosition = new System.Numerics.Vector3(obj.Position.X, obj.Position.Y, obj.Position.Z);
                    Manager.Sound.ListenerOrientationForward = System.Numerics.Vector3.Normalize(new System.Numerics.Vector3(obj.Rotation.Forward.X, obj.Rotation.Forward.Y, obj.Rotation.Forward.Z));
                    Manager.Sound.ListenerOrientationUpwards = System.Numerics.Vector3.Normalize(new System.Numerics.Vector3(obj.Rotation.Up.X, obj.Rotation.Up.Y, obj.Rotation.Up.Z));
                    Manager.Listener.Position = obj.Position;
                    Manager.Listener.Forward = obj.Rotation.Forward;
                    Manager.Listener.Up = obj.Rotation.Up;
                }
                if (obj.ShouldDestroy)
                {
                    Removable.Add(obj);
                }
            }
            UpdateRadar();
            CheckCollisions();

            return;
        }

        private void UpdateRadar()
        {
            var candidates = objtree.Find(_player.Position, new Vector3(1000, 1000, 1000));
            ObjectRadar.Update(candidates);
        }

        public void HandleInput(GameTime gameTime, KeyboardState inputs)
        {
            Input.Update();
            Vector3 move = new Vector3(0, 0, 0);
            if (Input.IsPressed(Keys.W))
            {
                move.Z = -_player.Acceleration.Z;
            }
            if (Input.IsPressed(Keys.S))
            {
                move.Z = _player.Acceleration.Z;
            }
            if (Input.IsPressed(Keys.A))
            {
                move.X = -_player.Acceleration.X;
            }
            if (Input.IsPressed(Keys.D))
            {
                move.X = _player.Acceleration.X;
            }
            if (Input.IsPressed(Keys.Left))
            {
                _player.RotateY(0.05f);
            }
            if (Input.IsPressed(Keys.Right))
            {
                _player.RotateY(-0.05f);
            }
            if (Input.IsPressed(Keys.Up))
            {
                _player.RotateX(0.05f);
            }
            if (Input.IsPressed(Keys.Down))
            {
                _player.RotateX(-0.05f);
            }
            _player.Accelerate(move);
            if (Input.IsJustPressed(Keys.Space))
            {
                _player.CurrentWeapon.Shoot(gameTime);
            }
            if (Input.IsJustReleased(Keys.Space))
            {
                _player.CurrentWeapon.Stop();
            }
            if (Input.IsJustPressed(Keys.V))
            {
                Tolk.Speak(_player.Movement.Length().ToString(), true);
            }
            if (Input.IsJustPressed(Keys.C))
            {
                Tolk.Speak(_player.Position.ToString());
            }
            if (Input.IsJustPressed(Keys.R))
            {
                if (ObjectRadar.Active)
                {
                    ObjectRadar.Stop();
                } else
                {
                    ObjectRadar.Start();
                }
            }
            if (Input.IsJustPressed(Keys.O))
            {
                Tolk.Speak(Objects.Count.ToString());
            }
        }

        private void CheckCollisions()
        {
            foreach (var obj in Objects)
            {
                if (!obj.Active) continue;
                var candidates = objtree.Find(obj.Position, obj.Dimensions);
                foreach (var target in candidates)
                {
                    if (obj == target || !target.Active) continue;
                    if (Intersects(obj, target))
                    {
                        obj.OnCollision(target);
                        target.OnCollision(obj);
                    }
                }
            }
        }

        public bool Intersects(IGameObject obj1, IGameObject obj2)
        {
            return (obj1.Position.X <= (obj2.Position.X + obj2.Dimensions.X) && (obj1.Position.X + obj1.Dimensions.X) >= obj2.Position.X) && (obj1.Position.Y <= (obj2.Position.Y + obj2.Dimensions.Y) && (obj1.Position.Y + obj1.Dimensions.Y) >= obj2.Position.Y) && (obj1.Position.Z <= (obj2.Position.Z + obj2.Dimensions.Z) && (obj1.Position.Z + obj1.Dimensions.Z) >= obj2.Position.Z);
        }

        public void AddObject(IGameObject obj)
        {
            Addable.Add(obj);
        }
    }
}