using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using EvilSatellites.Menu;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using DavyKager;

namespace EvilSatellites.Screens
{
    public class MenuScreen : IScreen
    {
        public MenuContainer MenuOptions;
        public int CursorPosition;
        public ScreenManager _Manager;
        public ScreenState _State;
        public InputManager Inputs = new InputManager();
        public MenuScreen(ScreenManager manager, MenuContainer options)
        {
            _Manager = manager;
            MenuOptions = options;
        }

        ScreenManager IScreen.Manager { get => _Manager; set => _Manager = value; }
        ScreenState IScreen.State { get => _State; set => _State = value; }

        void IScreen.Activate()
        {
            CursorPosition = 0;
            Tolk.Output(MenuOptions.Title, true);
            Tolk.Output(MenuOptions.Description, false);
            Tolk.Output(MenuOptions.Entries[CursorPosition].Name);
        }

        void IScreen.Deactivate()
        {
            return;
        }

        void IScreen.HandleInput(GameTime gameTime, KeyboardState inputs)
        {
            Inputs.Update();
            if (Inputs.IsJustPressed(Keys.Down))
            {
                NextItem();
            }
            if (Inputs.IsJustPressed(Keys.Down))
            {
                PreviousItem();
            }
            if (Inputs.IsJustPressed(Keys.Enter))
            {
                SelectItem();
            }
        }

        void IScreen.Update(GameTime gameTime)
        {
            return;
        }

        public void PreviousItem()
        {
            CursorPosition--;
            CheckMenuBounds();
            ReadMenuItem();
        }

        public void NextItem()
        {
            CursorPosition++;
            CheckMenuBounds();
            ReadMenuItem();
        }

        public void CheckMenuBounds()
        {
            if (CursorPosition > MenuOptions.Entries.Count-1)
            {
                CursorPosition = 0;
            }
            if (CursorPosition < 0)
            {
                CursorPosition = MenuOptions.Entries.Count - 1;
            }
        }

        public void ReadMenuItem()
        {
            Tolk.Output(MenuOptions.Entries[CursorPosition].Name, true);
        }

        public void SelectItem()
        {
            return;
        }
    }
}