using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using RhythmBullet.Zer01HD.Utilities.Camera;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RhythmBullet.Zer01HD.UI.Book
{
    class Book
    {
        Camera2D camera;
        Page targetPage;
        Dictionary<string, Page> pages = new Dictionary<string, Page>();

        public Book(Camera2D camera)
        {
            this.camera = camera;
        }

        public void Draw(SpriteBatch batch)
        {
            for (int page = 0; page < pages.Count; page++)
            {
                pages.ElementAt(page).Value.Draw(batch);
            }
        }

        public void Update(GameTime gameTime)
        {
            if (targetPage != null)
            {
                Vector2 position;
                Rectangle targetBounds = targetPage.Bounds;
                position.X = targetBounds.X + (targetBounds.Width * 0.5f);
                position.Y = targetBounds.Y + (targetBounds.Height * 0.5f);
                camera.LinearInterpolationToPosition(0.4f, position);
                if (camera.Position == position)
                {
                    targetPage = null;
                }
            }

            for (int page = 0; page < pages.Count; page++)
            {
                pages.ElementAt(page).Value.Update(gameTime);
            }
        }

        public void AddPage(Page page)
        {
            pages.Add(page.Name, page);
        }

        public void RemovePage(Page page)
        {
            RemovePage(page.Name);
        }

        public void RemovePage(string name)
        {
            pages.Remove(name);
        }

        public void LerpToPage(Page page)
        {
            targetPage = page;
        }

        public void GoToPage(Page page)
        {
            Rectangle targetBounds = page.Bounds;
            camera.Position.X = targetBounds.X + (targetBounds.Width * 0.5f);
            camera.Position.Y = targetBounds.Y + (targetBounds.Height * 0.5f);
        }
    }
}