using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Microsoft.Xna.Framework;

namespace FirzLib.ScreenSystem
{
    public class ScreenManager
    {
        List<Screen> _screens;
        int _count;
        Game _gameRef;

        public ScreenManager(Game gameRef)
        {
            _count = 0;
            _screens = new List<Screen>();
            _gameRef = gameRef;
        }

        public void AddScreen(Screen screen)
        {
            _screens.Add(screen);
            _count++;
        }

        public void RemoveTopScreen()
        {
            _screens.RemoveAt(_count - 1);
            _count--;
        }

        public void RemoveScreen(Screen screen)
        {
            _screens.Remove(screen);
            _count--;
        }

        public void Update(GameTime gametime)
        {
            if (_count > 0)
                _screens[_count - 1].Update(gametime);
        }

        public void Draw(GameTime gameTime)
        {
            for (int x = 0; x < _count; x++)
            {
                _screens[x].Draw(gameTime);
            }
        }

        public bool isEmpty
        {
            get { return _count <= 0; }
        }

        public void Exit()
        {
            _gameRef.Exit();
        }
    }
}