using System;
using UIKit;
using CoreGraphics;
using Shared.IO;
using Foundation;

namespace Shared
{
	/// <summary>
	/// 在滑动事件下，可显示隐藏些自定义视图
	/// </summary>
	public class RowLayout : ViewGroup
	{
        /// <summary>
        /// OpenMenuAction
        /// </summary>
        public Action OpenMenuAction;
        
        /// <summary>
        /// 右边的视图列表
        /// </summary>
        internal System.Collections.Generic.List<Button> leftView = new System.Collections.Generic.List<Button>();
		/// <summary>
		/// 右边的视图列表
		/// </summary>
		internal System.Collections.Generic.List<Button> rigthView = new System.Collections.Generic.List<Button>();
		/// <summary>
		/// 下面那边张
		/// </summary>
		UIView lineUIView = new UIView();

		/// <summary>
		/// 重新刷新控件
		/// </summary>
		public override void Refresh()
		{
			base.Refresh();
			LineColor = lineColor;
		}
		/// <summary>
		/// 控件宽度
		/// </summary>
		public override int Width
		{
			get
			{
				return base.Width;
			}
			set
			{
				base.Width = value;
				if (!IsCanRefresh)
					return;

				var frame4 = lineUIView.Frame;
				frame4.Width = base.Width;
				lineUIView.Frame = frame4;
			}
		}

		/// <summary>
		/// 子视图的宽度
		/// </summary>
		public int SubViewWidth = 70;

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

				{
					var frame = realViewGroup.Frame;
					frame.Height = Height;
					realViewGroup.Frame = frame;
				}

				var frame4 = lineUIView.Frame;
				frame4.Y = base.Height - frame4.Height;
				lineUIView.Frame = frame4;
			}
		}

		uint lineColor = 0x80818181;
		/// <summary>
		/// 背景颜色
		/// </summary>
		/// <value>The color of the background.</value>
		public virtual uint LineColor
		{
			get
			{
				return lineColor;
			}
			set
			{
				lineColor = value;
				if (!IsCanRefresh)
				{
					return;
				}
				byte r, g, b, a;
				r = (byte)(lineColor / 256 / 256 % 256);
				g = (byte)(lineColor / 256 % 256);
				b = (byte)(lineColor % 256);
				a = (byte)(lineColor / 256 / 256 / 256 % 256);
				lineUIView.BackgroundColor = UIKit.UIColor.FromRGBA(r, g, b, a);
			}
		}

        /// <summary>
        /// 是否正打开
        /// </summary>
        //public bool IsOpening;
        public bool IsShowLeft;
        public bool IsShowRight;

        /// <summary>
        /// 关闭其他RowLayout 显示的View
        /// </summary>
        private void HideOtherRowLayout()
        {
            try
            {
                if (this.Parent != null)
                {
                    foreach (View mView in Parent.viewList)
                    {
                        if (mView is RowLayout && mView != this)
                        {

                            if ((mView as RowLayout).IsShowRight || (mView as RowLayout).IsShowLeft)
                            {
                                (mView as RowLayout).HideMenu();
                            }
                        }
                    }

                }
            }
            catch
            {
            }
        }

        /// <summary>
        /// 关闭显示的View
        /// </summary>
        public void HideMenu()
        {
            if (IsShowLeft)
            {
                HideLeftMenu();
            }
            if (IsShowRight)
            {
                HideRightMenu();
            }

        }

        public void OpenLeftMenu()
        {
            HideOtherRowLayout();
            if (IsShowRight)
            {
                HideRightMenu();
                return;
            }

            if (leftView.Count == 0)
                return;

           
            IsShowLeft = true;
            (viewGroup as UIScrollView).SetContentOffset(new CGPoint(leftView[0].RealView.Frame.X, 0), true);
            OpenMenuAction?.Invoke();
        }

        public void HideLeftMenu()
        {
            IsShowLeft = false;
            HideAllMenuView();
        }

        public void OpenRightMenu()
        {
            HideOtherRowLayout();
            if (IsShowLeft)
            {
                HideLeftMenu();
                return;
            }
            if (rigthView.Count == 0)
                return;
            IsShowRight = true;
            var rigthViewX = realViewGroup.Frame.X + GetAllRightViewWidth();
            (viewGroup as UIScrollView).SetContentOffset(new CGPoint(rigthViewX, 0), true);
            OpenMenuAction?.Invoke();

        }

        public void HideRightMenu()
        {
            IsShowRight = false;

            HideAllMenuView();
        }

        void RestMenuView() {
            if (IsShowRight)
            {
                OpenRightMenu();
            }
            else if (IsShowLeft)
            {
                OpenLeftMenu();

            }
            else {
                HideAllMenuView();
            }
          
        }

        void HideAllMenuView()
        {
            (viewGroup as UIScrollView).SetContentOffset(new CGPoint(realViewGroup.Frame.X, 0), true);
        }

        /// <summary>
        /// 是否使用同样的SubViewWidth宽 
        /// </summary>
        bool isUseSameSubViewWidth = true;
        public bool IsUseSameSubViewWidth
        {
            get
            {
                return isUseSameSubViewWidth;

            }
            set
            {
                isUseSameSubViewWidth = value;
            }

        }

        /// <summary>
        /// 获取当前leftView的总宽
        /// </summary>
        /// <returns></returns>
        int GetAllLeftViewWidth() {
            int mWidth = 0;
            foreach (var mView in leftView)
            {
                mWidth += mView.Width;
            }
            return mWidth;
        }

        /// <summary>
        /// 获取当前rigthView的总宽
        /// </summary>
        /// <returns></returns>
        int GetAllRightViewWidth()
        {
            int mWidth = 0;
            foreach (var mView in rigthView)
            {
                mWidth += mView.Width;
            }
            return mWidth;
        }


        /// <summary>
        /// 增加左边视图
        /// </summary>
        /// <param name="view">View.</param>
        public void AddLeftView(Button view)
		{
			if (null == view)
			{
				return;
			}

            var mSubViewWidth = isUseSameSubViewWidth ? SubViewWidth : view.Width;

            view.X = GetAllLeftViewWidth();
			view.Y = 0;
			view.Width = mSubViewWidth;
			view.Height = Height;
			viewGroup.AddSubview(view.RealView);
			view.Parent = this;
			view.Refresh();
			leftView.Add(view);
			var frame = realViewGroup.Frame;
			frame.X += mSubViewWidth;
			realViewGroup.Frame = frame;
			foreach (var right in rigthView)
			{
				right.X += mSubViewWidth;
			}

            RefreshContentSize();
		}

        void RefreshContentSize() {
            var menuWidth = GetAllLeftViewWidth() + GetAllRightViewWidth();
            (viewGroup as UIScrollView).ContentSize = new CoreGraphics.CGSize(menuWidth + realViewGroup.Frame.Width, 0);
            (viewGroup as UIScrollView).SetContentOffset(new CGPoint(realViewGroup.Frame.X, 0), false);
        }

        internal override void removeChildParent()
        {
            foreach (var tempView in leftView)
            {
                tempView.Parent = null;
            }
            foreach (var tempView in rigthView)
            {
                tempView.Parent = null;
            }
            base.removeChildParent();
        }

        /// <summary>
        /// 增加右边视图
        /// </summary>
        /// <param name="view">View.</param>
        public void AddRightView(Button view)
		{
           if (null == view)
			{
				return;
			}
            var mSubViewWidth = isUseSameSubViewWidth ? SubViewWidth : view.Width;

            view.X =(int)realViewGroup.Frame.Right + GetAllRightViewWidth();
			view.Y = 0;
			view.Width = mSubViewWidth;
			view.Height = Height;
			viewGroup.AddSubview(view.RealView);
			view.Parent = this;
			view.Refresh();
			rigthView.Add(view);

            RefreshContentSize();
		}

        nfloat beforeXScrollX;
        nfloat moveX;
        /// <summary>
        /// 在滑动事件下，可显示隐藏些自定义视图
        /// </summary>
        public RowLayout()
		{
            viewGroup = new UIScrollView { Bounces = false };
            realViewGroup = new MyRowLayout(this) { };
            
			viewGroup.AddSubview(realViewGroup);
			viewGroup.Layer.MasksToBounds = true;

			lineUIView.BackgroundColor = new UIColor(0x81 / 255.0f, 0x81 / 255.0f, 0x81 / 255.0f, 0.8f);
			var lineUIViewFrame = lineUIView.Frame;
			lineUIViewFrame.Height = 1.0f;
			lineUIView.Frame = lineUIViewFrame;
			viewGroup.AddSubview(lineUIView);

            (viewGroup as UIScrollView).ShowsHorizontalScrollIndicator = false;//隐藏水平滚动条

           
            (viewGroup as UIScrollView).Scrolled += (s, e) =>
            {
                moveX = (viewGroup as UIScrollView).ContentOffset.X - beforeXScrollX;
            };

            (viewGroup as UIScrollView).DraggingStarted += (sender, e) =>
            {
                beforeXScrollX = (viewGroup as UIScrollView).ContentOffset.X;
            };

            (viewGroup as UIScrollView). DecelerationStarted += (s, e) =>
            {
              
                GetMovePageIndex();

            };

           

            (viewGroup as UIScrollView).DraggingEnded += (s, e) =>
            {
                if (!e.Decelerate)
                {
                    GetMovePageIndex();
                }
            };

        }

        void GetMovePageIndex(){

            if (20 < Math.Abs(moveX))
            {
                if (moveX < 0)
                {
                    OpenLeftMenu();
                }
                else if (moveX > 0)
                {
                    OpenRightMenu();
                }
            }
            else
            {
                RestMenuView();
            }
        }


        /// <summary>
        /// 垂直方向滚动视图
        /// </summary>
        class MyRowLayout : UIView
        {
            [Weak] internal RowLayout rowLayout;
            public MyRowLayout(RowLayout rowLayout)
            {
                this.rowLayout = rowLayout;
            }
            /// <summary>
            /// 点击开始
            /// </summary>
            /// <param name="touches">Touches.</param>
            /// <param name="evt">Evt.</param>
            public override void TouchesBegan(NSSet touches, UIEvent evt)
            {
                rowLayout?.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)
            {
                rowLayout?.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)
            {
                rowLayout?.TouchEvent(EventActions.Up, (touches.AnyObject as UITouch).LocationInView(this));
            }

            public override void TouchesCancelled(NSSet touches, UIEvent evt)
            {
                rowLayout?.TouchEvent(EventActions.Cancel, (touches.AnyObject as UITouch).LocationInView(this));
            }
            /// <summary>
            /// 框架默认加了两个UIImageView ，这样可以去掉默认添加
            /// </summary>
            /// <param name="view">View.</param>
            public override void AddSubview(UIView view)
            {
                if (view.GetType() == typeof(UIImageView) && view.Tag != int.MinValue)
                {
                    return;
                }
                base.AddSubview(view);
            }
        }
    }
}