using System;
using UIKit;
using CoreGraphics;

namespace Shared
{
	/// <summary>
	/// Loading UI
	/// </summary>
	public class Loading : View
	{

        public bool CurStatus = false;
		internal IosLoading iosLoading
		{
			get
			{
				return uiView as IosLoading;
			}
			set
			{
				uiView = value;
			}
		}

		/// <summary>
		/// Loading UI
		/// </summary>
		public Loading()
		{
			var bounds = UIScreen.MainScreen.Bounds;
			iosLoading = new IosLoading(bounds);
		}


		/// <summary>
		/// 开始当前视图
		/// </summary>
		public void Start()
		{
			iosLoading.uiLabel.Text = "Loading......";
			iosLoading.Start();
            CurStatus = true;
        }

		/// <summary>
		/// 开始当前视图
		/// </summary>
		public void Start(string s)
		{
			iosLoading.uiLabel.Text = s;
			iosLoading.Start();
        }


		/// <summary>
		/// 隐藏当前视图
		/// </summary>
		public void Hide()
		{
            iosLoading.uiLabel.Text = "Loading......";
            iosLoading.Hide();
            CurStatus = false;
        }

		public string Text
		{
			get
			{
				return iosLoading.uiLabel.Text;
			}
			set
			{
				iosLoading.uiLabel.Text = value;
			}
		}

        public virtual uint LodingBackgroundColor
        {
            get
            {
                return (iosLoading as IosLoading).LodingBackgroundColor;
            }
            set
            {
                (iosLoading as IosLoading).LodingBackgroundColor = value;
            }
        }
    }

	internal class IosLoading : UIView {
		
		UIActivityIndicatorView activitySpinner= new UIActivityIndicatorView(UIActivityIndicatorViewStyle.WhiteLarge);
        public UILabel uiLabel=new UILabel();
        UIView backUIView = new UIView(new CGRect(0, 0, 160, 100));

        public IosLoading(CGRect frame)
        {
            Frame = frame;
            Hidden = true;

            AutoresizingMask = UIViewAutoresizing.All;

            var f = backUIView.Frame;
            f.Width = frame.Width;
            f.Height = frame.Height;
            backUIView.Frame = f;
            var center = backUIView.Center;
            center.X = Frame.Width / 2; 
            center.Y = Frame.Height / 2; 
            backUIView.Center = center;
            AddSubview(backUIView);
            // create the activity spinner, center it horizontall and put it 5 points above center x
            var center1 = activitySpinner.Center;
            center1.X = backUIView.Frame.Width / 2;
            center1.Y = (backUIView.Frame.Height - 22) / 2;
            activitySpinner.Center = center1;
            backUIView.AddSubview(activitySpinner);
            activitySpinner.BackgroundColor = UIColor.Clear;

            var frame2 = uiLabel.Frame;
            frame2.Y = activitySpinner.Frame.Bottom+22;
            frame2.Width = backUIView.Frame.Width;
            frame2.Height = 22;
            uiLabel.Frame = frame2;

            uiLabel.BackgroundColor = UIColor.Clear;
            uiLabel.TextColor = UIColor.White;
            uiLabel.TextAlignment = UITextAlignment.Center;
            backUIView.AddSubview(uiLabel);
        }

        public void Start()
        {
            if (Superview == null)
            {
                return;
            }
            BackgroundColor = UIKit.UIColor.FromRGBA(0x32, 0x32, 0x32, 0xF0);
            Hidden = false;
            activitySpinner.StartAnimating();
            Superview.BringSubviewToFront(this);
        }

		/// <summary>
		/// Fades out the control and then removes it from the super view
		/// </summary>
		public void Hide ()
		{
            if(Superview==null){
                return;
            }
			Hidden = true;
			activitySpinner.StopAnimating ();
			Superview.SendSubviewToBack(this);
		}

        uint loadingBackgroundColor;
        /// <summary>
        /// 背景颜色
        /// </summary>
        /// <value>The color of the background.</value>
        public virtual uint LodingBackgroundColor
        {
            get
            {
                return loadingBackgroundColor;
            }
            set
            {
                loadingBackgroundColor = value;

                if (this.GetType() != typeof(ImageView))
                {
                    byte r, g, b, a;
                    r = (byte)(loadingBackgroundColor / 256 / 256 % 256);
                    g = (byte)(loadingBackgroundColor / 256 % 256);
                    b = (byte)(loadingBackgroundColor % 256);
                    a = (byte)(loadingBackgroundColor / 256 / 256 / 256 % 256);
                    backUIView.BackgroundColor = UIKit.UIColor.FromRGBA(r, g, b, a);


                    backUIView.Layer.MasksToBounds = true;
                    backUIView.Layer.CornerRadius = 6;
                    backUIView.Layer.BorderWidth = 0;
                }
            }
        }
    }
}