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

namespace BouncyCatIsBouncy
{
    class PauseMenu : IMenu
    {

        public bool Closed { get; private set; }

        Texture2D m_background;
        SpriteBatch m_batch;
        Input<Activity> m_input;
        bool m_waitedAFrame;
        Button m_resume, m_main;

        const int DISTANCE_BETWEEN_BUTTONS = 125;

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

            m_batch = batch;
            m_input = input;

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

            m_resume = new Button(content.Load<Texture2D>(@"Menus/btn-resume"));
            m_resume.Center = new Vector2(ScreenSize.HalfWidth - DISTANCE_BETWEEN_BUTTONS, ScreenSize.Height - m_resume.Height * 3);
            m_resume.OnClick += () => Closed = true;

            m_main = new Button(content.Load<Texture2D>(@"Menus/btn-main"));
            m_main.Center = new Vector2(ScreenSize.HalfWidth + DISTANCE_BETWEEN_BUTTONS, ScreenSize.Height - m_main.Height * 3);
            m_main.OnClick += () => Closed = true;
            m_main.OnClick += exit;
        }

        public void Draw()
        {
            m_batch.Draw(m_background, Vector2.Zero, new Color(Color.White, 200));
            m_resume.Draw(m_batch);
            m_main.Draw(m_batch);
        }


        public void Update(float dt)
        {
            if (!m_waitedAFrame)
            {
                m_waitedAFrame = true;
                return;
            }


            if (m_input.IsActivityPressed(Activity.Menu))
            {
                Closed = true;
            }

            m_resume.Update(m_input);
            m_main.Update(m_input);
        }
    }
}