using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using SynthySound;
using Microsoft.Xna.Framework.Audio;
using EvilSatellites.Screens;


namespace EvilSatellites
{
    public class ScreenManager : DrawableGameComponent
    {
        private List<IScreen> _Screens;
        private List<IScreen> _ToRemove;
        private List<IScreen> _ToAdd;
        private IScreen _CurrentScreen;
        private Game _Game;
        private bool _Running = false;
        public Synthy Sound;
        public MusicManager Music;
        public AI Computer;
        public VibrationManager Vibrations;
        public FDNReverb EnvironmentEffect;
        public ScreenManager(Game instance): base(instance)
        {
            Sound = new Synthy();
            Music = new MusicManager(Sound);
            Computer = new AI(Sound);
            Vibrations = new VibrationManager(PlayerIndex.One);
            EnvironmentEffect = Sound.CreateReverb();
            EnvironmentEffect.Delay = 0.03;
            EnvironmentEffect.Wet = 30;
            EnvironmentEffect.T60 = 1;
            EnvironmentEffect.Defusion = 1f;
            EnvironmentEffect.FreePath = 0.02;
            Sound.SetMaxDistance(150);
            _Game = instance;
            _Screens = new List<IScreen>();
            _ToRemove = new List<IScreen>();
            _ToAdd = new List<IScreen>();
            _CurrentScreen = null;
        }

        public override void Initialize()
        {
            _Running = true;
            foreach (var screen in _Screens)
            {
                screen.Activate();
            }
            base.Initialize();
        }

        public void AddScreen(IScreen screen)
        {
            screen.Manager = this;
            _ToAdd.Add(screen);
        }
        public void RemoveScreen(IScreen screen)
        {
            if (!_Screens.Contains(screen))
            {
                throw new Exception("Cannot remove a screen that isn't added to manager");
            }
            _ToRemove.Add(screen);
        }

        public void Update(GameTime gameTime)
        {
            Vibrations.Update((float)gameTime.ElapsedGameTime.TotalMilliseconds);
            if (_ToAdd.Count > 0)
            {
                foreach (var screen in _ToAdd)
                {
                    screen.Activate();
                    _Screens.Add(screen);
                }
                _ToAdd.Clear();
            }
            if (_ToRemove.Count > 0)
            {
                foreach (var screen in _ToRemove)
                {
                    screen.Deactivate();
                    _Screens.Remove(screen);
                }
                _ToRemove.Clear();
            }
            Sound.Update();
            var input = Keyboard.GetState();
            foreach (var screen in _Screens)
            {
                if (screen.State == ScreenState.Active) screen.HandleInput(gameTime, input);
                screen.Update(gameTime);
            }
            base.Update(gameTime);
        }
    }
}