using System.Diagnostics;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

namespace BouncyCatIsBouncy
{
    public delegate void OnSelectedHandler();
    class MainMenu : IMenu
    { 
        public bool Closed { get; private set; }

        SpriteBatch m_batch;
        Input<Activity> m_input;
        Texture2D m_background;
        Button m_start, m_exit;
        RandomCatSounds m_catSounds;
        

        const int DISTANCE_BETWEEN_BUTTONS = 125;

        public MainMenu(ContentManager content, SpriteBatch batch, AudioBank music, Input<Activity> input, OnSelectedHandler start, OnSelectedHandler exit)
        {
            Debug.Assert(content != null);
            Debug.Assert(batch != null);
            Debug.Assert(input != null);

            m_batch = batch;
            m_input = input;
            music.PlayCue("title");

            m_background = content.Load<Texture2D>(@"Menus/main-bg");

            m_start = new Button(content.Load<Texture2D>(@"Menus/btn-start"));
            m_start.Center = new Vector2(ScreenSize.HalfWidth - DISTANCE_BETWEEN_BUTTONS, ScreenSize.Height - m_start.Height);
            m_start.OnClick += start;
            m_start.OnClick += () => Closed = true;
            m_start.OnEnter += () => m_catSounds.Play();

            m_exit = new Button(content.Load<Texture2D>(@"Menus/btn-exit"));
            m_exit.Center = new Vector2(ScreenSize.HalfWidth + DISTANCE_BETWEEN_BUTTONS, ScreenSize.Height - m_exit.Height);
            m_exit.OnClick += exit;
            m_exit.OnClick += () => Closed = true;
            m_exit.OnEnter += () => m_catSounds.Play();

            m_catSounds = new RandomCatSounds(content);
        }

        public void Draw()
        {
            m_batch.Draw(m_background, Vector2.Zero, Color.White);
            m_start.Draw(m_batch);
            m_exit.Draw(m_batch);
        }

        public void Update(float dt)
        {
            m_start.Update(m_input);
            m_exit.Update(m_input);
        }
    }
}