using System;
using CoreGraphics;
using Foundation;
using UIKit;

namespace Shared
{
    public class GradientMaskView : View
    {

        GradientButton mGradientButton
        {
            get
            {
                return uiView as GradientButton;
            }
            set
            {
                uiView = value;
            }
        }



        public GradientMaskView()
        {
            mGradientButton = new GradientButton(this) { };
            SetGradientColors(mGradientColors);
        }

        //CAGradientLayer gradient = new CAGradientLayer();
        //void SetCAGradientLayer()
        //{

        //    gradient.Colors = new CoreGraphics.CGColor[] { startUIColor.CGColor, endUIColor.CGColor };
        //    gradient.StartPoint = new CoreGraphics.CGPoint(0, 0);
        //    gradient.EndPoint = new CoreGraphics.CGPoint(0.0, 1.0);
        //    //gradient.Locations = new Foundation.NSNumber[] { 0.0, 1.0};
        //    gradient.Frame = iosButton.Bounds;
        //    iosButton.Layer.AddSublayer(gradient);
        //}

        /// <summary>
        /// 刷新布局
        /// </summary>
        private void RefreshFrame()
        {
            (uiView as GradientButton).InitWithFrameArc(new CoreGraphics.CGRect(base.X, base.Y, base.Width, base.Height));
        }

        /// <summary>
		/// 控件宽度
		/// </summary>
		public override int Width
        {
            get
            {
                return base.Width;
            }
            set
            {
                base.Width = value;
                RefreshFrame();
            }
        }


        /// <summary>
        /// 控件的高度
        /// </summary>
        public override int Height
        {
            get
            {
                return base.Height;
            }
            set
            {
                base.Height = value;
                RefreshFrame();
            }
        }

        /// <summary>
        /// 控件的X坐标
        /// </summary>
        public override int X
        {
            get
            {
                return base.X;
            }
            set
            {
                base.X = value;
                RefreshFrame();
            }
        }


        /// <summary>
        /// 控件的X坐标
        /// </summary>
        public override int Y
        {
            get
            {
                return base.Y;
            }
            set
            {
                base.Y = value;
                RefreshFrame();
            }
        }



       
        public bool IsShow
        {
            get
            {
                return mGradientButton.IsShow;

            }
            set
            {
                mGradientButton.IsShow = value;
             
            }

        }


        /// <summary>
        /// 0%，25%，50%，80%
        /// </summary>
        uint[] mGradientColors = { 0x00000000, 0x40000000, 0x80000000, 0xCC000000 };
        public uint[] GradientColors {
            get
            {
                return mGradientColors;

            }
            set
            {
                mGradientColors = value;
                SetGradientColors(mGradientColors);

            }
        }

        void SetGradientColors(uint[] colors) {
            if (colors == null || colors.Length == 0) return;

            CGColor[] mCGColors = new CGColor[colors.Length];

            for (int i = 0; i < colors.Length; i++) {
                mCGColors[i] = HDLUtils.GetUIColorWithUint(colors[i]).CGColor;
            }
            mGradientButton.GradientColors = mCGColors;
        }

        public class GradientButton : UIKit.UIView
        {
            /// <summary>
            /// 刷新布局
            /// </summary>
            public void InitWithFrameArc(CGRect mCGRect)
            {
                this.Frame = mCGRect;
            }

            [Weak] View view;
            public GradientButton(View view)
            {
                this.view = view;
            }



            bool isShow = true;
            public bool IsShow
            {
                get
                {
                    return isShow;
                }
                set
                {
                    isShow = value;
                    SetNeedsDisplay();
                }
            }

            public override void Draw(CGRect rect)
            {
                base.Draw(rect);

                if (isShow)
                {
                    CGContext ctx = UIGraphics.GetCurrentContext();
                    if (ctx == null) return;
                    ctx.SaveState();
                    DrawWithGradient(ctx, rect);
                    ctx.RestoreState();
                }

            }


            /// <summary>
            /// 绘制渐变效果
            /// </summary>
            /// <param name="ctx"></param>
            /// <param name="rect"></param>
            void DrawWithGradient(CGContext ctx, CGRect rect)
            {
                // 创建一个渐变色
                // 创建RGB色彩空间，创建这个以后，context里面用的颜色都是用RGB表示
                CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
                CGGradient gradient = new CGGradient(colorSpace, mGradientColors);
                // 释放色彩空间
                colorSpace.Dispose();
                colorSpace = null;
                // 剪裁路径
                ctx.Clip();
                // 用渐变色填充
                ctx.DrawLinearGradient(gradient, new CGPoint(rect.X, rect.Top), new CGPoint(rect.X, rect.Bottom), CGGradientDrawingOptions.None);
                // 释放渐变色
                gradient.Dispose();
                gradient = null;

                ctx.RestoreState();
                ctx.SaveState();
            }

            public CGColor[] mGradientColors = { UIColor.Clear.CGColor};

            public CGColor[] GradientColors {
                get
                {
                    return mGradientColors;
                }
                set
                {
                    mGradientColors = value;
                    SetNeedsDisplay();
                }
            }

       

            /// <summary>
            /// 点击开始
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesBegan(NSSet touches, UIEvent evt)
            {
                view?.TouchEvent(EventActions.Down, (touches.AnyObject as UITouch).LocationInView(this));
            }
            /// <summary>
            ///  移动
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesMoved(NSSet touches, UIEvent evt)
            {
                view?.TouchEvent(EventActions.Move, (touches.AnyObject as UITouch).LocationInView(this));
            }

            /// <summary>
            /// 点击弹起
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesEnded(NSSet touches, UIEvent evt)
            {
                view?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
            }

            public override void TouchesCancelled(NSSet touches, UIEvent evt)
            {
                view?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
            }


        }
    }
}