using System;
using Android.Content;
using Android.Views;
using Android.Views.Animations;

namespace Shared
{
    public class SwipeLayout:ViewGroup
    {
        AndroidSwipeLayout androidSwipeLayout;

		uint lineColor = 0x62818181;
		/// <summary>
		/// 背景颜色
		/// </summary>
		/// <value>The color of the background.</value>
		public virtual uint LineColor
		{
			get
			{
				return lineColor;
			}
			set
            {
                lineColor = value;
                byte a, r, g, b;
                a = (byte)(lineColor / 256 / 256 / 256 % 256);
                r = (byte)(lineColor / 256 / 256 % 256);
                g = (byte)(lineColor / 256 % 256);
                b = (byte)(lineColor % 256);
                lineLinearLayout.SetBackgroundColor(Android.Graphics.Color.Argb(a, r, g, b));
            }
		}

		/// <summary>
		/// 宽度设置或读取
		/// </summary>
		/// <value>The width.</value>
		public override int Width
		{
			get
			{
				return base.Width;
			}
			set
			{
				base.Width = value;
				if (!IsCanRefresh)
				{
					return;
				}
				var layoutParameters = androidSwipeLayout.LayoutParameters;
				layoutParameters.Width = Width;
                androidSwipeLayout.LayoutParameters = layoutParameters;
			}
		}

		/// <summary>
		/// 视图高度
		/// </summary>
		/// <value>The height.</value>
		public override int Height
		{
			get
			{
				return base.Height;
			}
			set
			{
				base.Height = value;
				if (!IsCanRefresh)
				{
					return;
				}
				var layoutParameters = androidSwipeLayout.LayoutParameters;
				layoutParameters.Height = Height;
				androidSwipeLayout.LayoutParameters = layoutParameters;
			}
		}

		Android.Widget.LinearLayout leftLinarLayout;
		Android.Widget.LinearLayout rightLinarLayout;
		Android.Widget.LinearLayout lineLinearLayout;
		/// <summary>
		/// 在滑动事件下，可显示隐藏些自定义视图
		/// </summary>
		public SwipeLayout()
		{
			viewGroup = new Android.Widget.FrameLayout(Application.Activity);
            androidSwipeLayout = new AndroidSwipeLayout(Application.Activity, this);
			realViewGroup = androidSwipeLayout;
			leftLinarLayout = new Android.Widget.LinearLayout(Application.Activity) { Orientation = Android.Widget.Orientation.Horizontal, Alpha = 0.0f };
			rightLinarLayout = new Android.Widget.LinearLayout(Application.Activity) { Orientation = Android.Widget.Orientation.Horizontal, Alpha = 0.0f };
			lineLinearLayout = new Android.Widget.LinearLayout(Application.Activity);
			LineColor = lineColor;

			viewGroup.AddView(leftLinarLayout, new Android.Views.ViewGroup.LayoutParams(Android.Views.ViewGroup.LayoutParams.WrapContent, Android.Views.ViewGroup.LayoutParams.MatchParent));
			viewGroup.AddView(rightLinarLayout, new Android.Views.ViewGroup.LayoutParams(Android.Views.ViewGroup.LayoutParams.WrapContent, Android.Views.ViewGroup.LayoutParams.MatchParent));
			viewGroup.AddView(androidSwipeLayout, new Android.Views.ViewGroup.LayoutParams(Android.Views.ViewGroup.LayoutParams.MatchParent, Android.Views.ViewGroup.LayoutParams.MatchParent));
			viewGroup.AddView(lineLinearLayout, new Android.Widget.FrameLayout.LayoutParams(Android.Views.ViewGroup.LayoutParams.MatchParent, DensityUtil.Dip2Px(1), Android.Views.GravityFlags.Bottom));


		}

        void openLeftMenu()
        {
            hideRightMenu();

            if (leftLinarLayout.ChildCount == 0)
                return;

            Android.Widget.FrameLayout.LayoutParams lp = (Android.Widget.FrameLayout.LayoutParams)androidSwipeLayout.LayoutParameters;
            lp.LeftMargin = leftLinarLayout.LayoutParameters.Width;
            androidSwipeLayout.LayoutParameters = lp;
            leftLinarLayout.Alpha = 1.0f;

            leftLinarLayout.ClearAnimation();
            leftLinarLayout.Animation = new TranslateAnimation(
                Dimension.RelativeToSelf, 0.1f,
                Dimension.RelativeToSelf, 0,
                Dimension.RelativeToSelf, 0,
                Dimension.RelativeToSelf, 0);
            leftLinarLayout.Animation.Duration = 200;

            leftLinarLayout.Animation.StartNow();
        }

		void hideLeftMenu()
		{
			Android.Widget.FrameLayout.LayoutParams lp = (Android.Widget.FrameLayout.LayoutParams)androidSwipeLayout.LayoutParameters;
			lp.LeftMargin = 0;
			androidSwipeLayout.LayoutParameters = lp;
			leftLinarLayout.Alpha = 0.0f;
		}

		void openRightMenu()
		{
			hideLeftMenu();
			if (rightLinarLayout.ChildCount == 0)
				return;

			Android.Widget.FrameLayout.LayoutParams lp = (Android.Widget.FrameLayout.LayoutParams)androidSwipeLayout.LayoutParameters;
			lp.LeftMargin = -rightLinarLayout.LayoutParameters.Width;
			androidSwipeLayout.LayoutParameters = lp;

			rightLinarLayout.Alpha = 1.0f;

			if (rightLinarLayout.Animation == null)
			{
				rightLinarLayout.Animation = new TranslateAnimation(
						Dimension.RelativeToSelf, -0.1f,
						Dimension.RelativeToSelf, 0.0f,
						Dimension.RelativeToSelf, 0,
						Dimension.RelativeToSelf, 0);
				rightLinarLayout.Animation.Duration = 200;
			}

			rightLinarLayout.Animation.Reset();
			rightLinarLayout.Animation.StartNow();
		}

		void hideRightMenu()
		{
			Android.Widget.FrameLayout.LayoutParams lp = (Android.Widget.FrameLayout.LayoutParams)androidSwipeLayout.LayoutParameters;
			lp.LeftMargin = 0;
			androidSwipeLayout.LayoutParameters = lp;

			rightLinarLayout.Alpha = 0.0f;
		}

		/// <summary>
		/// 子视图的宽度
		/// </summary>
		int subViewWidth = 100;

		/// <summary>
		/// 增加左边视图
		/// </summary>
		/// <param name="view">View.</param>
		public void AddLeftView(View view)
		{
			leftLinarLayout.AddView(view.AndroidView, new Android.Views.ViewGroup.LayoutParams(DensityUtil.Dip2Px(subViewWidth), androidSwipeLayout.LayoutParameters.Height));
			leftLinarLayout.LayoutParameters.Width = leftLinarLayout.ChildCount * DensityUtil.Dip2Px(subViewWidth);
			view.Parent = this;
			view.Width = DensityUtil.Dip2Px(subViewWidth);
			view.Height = androidSwipeLayout.LayoutParameters.Height;
		}

		/// <summary>
		/// 增加右边视图
		/// </summary>
		/// <param name="view">View.</param>
		public void AddRightView(View view)
		{
			rightLinarLayout.AddView(view.AndroidView, new Android.Views.ViewGroup.LayoutParams(DensityUtil.Dip2Px(subViewWidth), androidSwipeLayout.LayoutParameters.Height));
			rightLinarLayout.LayoutParameters.Width = rightLinarLayout.ChildCount * DensityUtil.Dip2Px(subViewWidth);
			((Android.Widget.FrameLayout.LayoutParams)rightLinarLayout.LayoutParameters).LeftMargin = androidSwipeLayout.LayoutParameters.Width - rightLinarLayout.LayoutParameters.Width;
			view.Parent = this;
			view.Width = DensityUtil.Dip2Px(subViewWidth);
			view.Height = androidSwipeLayout.LayoutParameters.Height;
		}

        internal class AndroidSwipeLayout : Android.Widget.FrameLayout, GestureDetector.IOnGestureListener
		{
			/// <summary>
			/// 左右滑动的最短距离
			/// </summary>
			int distance = 100;
			/// <summary>
			/// 左右滑动的最小速度
			/// </summary>
			int velocity = 200;

            bool isFling;
            /// <summary>
            /// 手势对象
            /// </summary>
			GestureDetector mGesture;
            SwipeLayout swipeLayout;
            public AndroidSwipeLayout(Context context, SwipeLayout swipeLayout)
				: base(context)
            {
                this.swipeLayout = swipeLayout;
				mGesture = new GestureDetector(context, this);
			}



            public override bool OnTouchEvent(MotionEvent e)
            {
                if (Shared.AndroidView.IsLive(this) && !isFling)
                    swipeLayout.TouchEvent(e);
                return true;
            }

			public override bool OnInterceptTouchEvent(MotionEvent ev)
			{
                if (!Shared.AndroidView.IsLive(this))
                {
                    return false;
                }
				mGesture.OnTouchEvent(ev);
				//如果是滑动，就拦截事件，后面的事件是由自己的TouchEvent处理，子控件会收到取消事件，如果是快速滑动，事件也是自己处理
				if (isFling)
				{
					return true;
				}
				//如果是滑动这里也会返回True
				return base.OnInterceptTouchEvent(ev);
			}

			/// <summary>
			/// 设置所有父视图禁止拦截事件
			/// </summary>
			/// <param name="b">如果设置True表示不要拦截，如果设置为False表示可以拦截</param>
			void requestParentDisallowInterceptTouchEvent(bool b)
			{
				var tempParent = Parent;
				while (tempParent != null)
				{   //告诉父类不要拦截这个视图的事件
					tempParent.RequestDisallowInterceptTouchEvent(b);
					tempParent = tempParent.Parent;
				}
			}

			public bool OnDown(MotionEvent e)
			{
                isFling = false;
				return false;
			}

			public bool OnFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
			{
				// e1：第1个ACTION_DOWN MotionEvent
				// e2：最后一个ACTION_MOVE MotionEvent
				// velocityX：X轴上的移动速度（像素/秒）
				// velocityY：Y轴上的移动速度（像素/秒）
				// 向左滑
				if (e1.GetX() - e2.GetX() > distance
                    && Math.Abs(velocityX) > velocity)
				{
                    isFling = true;
					swipeLayout.openRightMenu();
				}
				// 向右滑
				if (e2.GetX() - e1.GetX() > distance
                    && Math.Abs(velocityX) > velocity)
				{
                    isFling = true;
					swipeLayout.openLeftMenu();
				}
				//迅速滑动，并松开  
				return false;
			}

			public void OnLongPress(MotionEvent e)
			{
                Shared.HDLUtils.WriteLine("OnLongPress:长按不放");
			}

			public bool OnScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
			{
				Shared.HDLUtils.WriteLine("OnScroll:在屏幕上滑动");
				return false;
			}

			public void OnShowPress(MotionEvent e)
			{
				Shared.HDLUtils.WriteLine("OnShowPress:手指按下一段时间，还没到长按");
			}

			public bool OnSingleTapUp(MotionEvent e)
			{
                if(!isFling){
                    swipeLayout.hideLeftMenu();
                    swipeLayout.hideRightMenu();
                }
				Shared.HDLUtils.WriteLine("OnSingleTapUp:手指弹起");
				return false;
			}
		}
    }
}