using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using MonoGame.Extended.TextureAtlases;

namespace MonoGame.Extended.Gui.Controls
{
    public class ProgressBar : Control
    {
        public ProgressBar()
        {
        }

        private float _progress = 1.0f;
        public float Progress
        {
            get { return _progress; }
            set
            {
                // ReSharper disable once CompareOfFloatsByEqualityOperator
                if(_progress != value)
                {
                    _progress = value;
                    ProgressChanged?.Invoke(this, EventArgs.Empty);
                }
            }
        }

        public TextureRegion2D BarRegion { get; set; }
        public Color BarColor { get; set; } = Color.White;

        public event EventHandler ProgressChanged;

        public override IEnumerable<Control> Children { get; } = Enumerable.Empty<Control>();

        public override Size GetContentSize(IGuiContext context)
        {
            return new Size(5, 5);
        }

        public override void Draw(IGuiContext context, IGuiRenderer renderer, float deltaSeconds)
        {
            base.Draw(context, renderer, deltaSeconds);

            var boundingRectangle = ContentRectangle;
            var clippingRectangle = new Rectangle(boundingRectangle.X, boundingRectangle.Y, (int)(boundingRectangle.Width * Progress), boundingRectangle.Height);

            if (BarRegion != null)
                renderer.DrawRegion(BarRegion, BoundingRectangle, BarColor, clippingRectangle);
            else
                renderer.FillRectangle(BoundingRectangle, BarColor, clippingRectangle);
        }

        //protected override void DrawBackground(IGuiContext context, IGuiRenderer renderer, float deltaSeconds)
        //{
        //    base.DrawBackground(context, renderer, deltaSeconds);


        //}
    }
}