using System;
using Android.Widget;
using Android.Content;
using Android.Graphics;
using Android.Views;
using Android.Util;
using Android.Runtime;

namespace Shared
{
	//已经全面检查了代码
	/// <summary>
	/// 位置布局
	/// </summary>
	public class VerticalSeekBar : View
	{
		/// <summary>
		/// 当前视图
		/// </summary>
		/// <value>The android horizonetal seek bar.</value>
		VerticalSeekBarAndroidFrameLayout verticalSeekBarAndroidFrameLayout
		{
			get
			{
				return AndroidView as VerticalSeekBarAndroidFrameLayout;
			}
			set
			{
				AndroidView = value;
			}
		}
		Android.Widget.ImageView btnBackgroundColor;
		/// <summary>
		/// 显示进度控件
		/// </summary>
		Android.Widget.ImageView btnProgressColor;
		/// <summary>
		/// 滑块
		/// </summary>
		Android.Widget.ImageView btnThum;


		/// <summary>
		/// 当前实例
		/// </summary>
		public VerticalSeekBar()
		{
			verticalSeekBarAndroidFrameLayout = new VerticalSeekBarAndroidFrameLayout(Application.Activity, this);
			btnBackgroundColor = new Android.Widget.ImageView(Application.Activity);
			verticalSeekBarAndroidFrameLayout.AddView(btnBackgroundColor, new Android.Widget.FrameLayout.LayoutParams(DensityUtil.Dip2Px(1), 0, GravityFlags.CenterHorizontal));
			btnProgressColor = new Android.Widget.ImageView(Application.Activity);
			verticalSeekBarAndroidFrameLayout.AddView(btnProgressColor, new Android.Widget.FrameLayout.LayoutParams(DensityUtil.Dip2Px(1), 0, GravityFlags.CenterHorizontal));
			btnThum = new Android.Widget.ImageView(Application.Activity);
			verticalSeekBarAndroidFrameLayout.AddView(btnThum, new Android.Widget.FrameLayout.LayoutParams(DensityUtil.Dip2Px(24), DensityUtil.Dip2Px(24), GravityFlags.CenterHorizontal));

		}

        internal override bool TouchEvent(MotionEvent e)
        {
            switch (e.Action)
            {
                case MotionEventActions.Down:
                    dateTime = DateTime.Now;
                    setButtonLoaction((int)e.GetY());
                    break;
                case MotionEventActions.Move:
                    setButtonLoaction((int)e.GetY());
                    break;
                case MotionEventActions.Cancel:
                case MotionEventActions.Up:
                    dateTime = DateTime.MinValue;
                    setButtonLoaction((int)e.GetY());
                    break;
            }
			return base.TouchEvent(e);
		}

		/// <summary>
		/// 当前视图的高度
		/// </summary>
		/// <value>The height.</value>
		public override int Height
		{
			get
			{
				return base.Height;
			}
			set
			{
				base.Height = value;

				var frameBackgroundColor = btnBackgroundColor.LayoutParameters as Android.Widget.FrameLayout.LayoutParams;
				frameBackgroundColor.Height = base.Height;
				btnBackgroundColor.LayoutParameters = frameBackgroundColor;
			}
		}
		DateTime dateTime;
        /// <summary>
        ///  进度变化事件
        /// </summary>
        public Action<View, int> ProgressChanged;

		int max = 100;
		/// <summary>
		/// 最大值
		/// </summary>
		/// <value>The max.</value>
		public int Max
		{
			get
			{
				return max;
			}
			set
			{
				max = value;
			}
		}
		bool isCanScrolled = true;
		/// <summary>
		/// 是否允许滑动滑块
		/// </summary>
		/// <value><c>true</c> if is can scrolled; otherwise, <c>false</c>.</value>
		public bool IsCanScrolled
		{
			get
			{
				return isCanScrolled;
			}
			set
			{
				isCanScrolled = value;
			}
		}

		int validHeight
		{
			get
			{
				return AndroidView.Height - btnThum.Height;
			}
		}

        //2019-08-29 改100毫秒
        public int DelayTime = 100;
        //防止跳动，延时显示状态
        DateTime delayDateTime = DateTime.MinValue;
		int progress;
		/// <summary>
		/// 当前进度
		/// </summary>
		/// <value>The progress.</value>
		public int Progress
		{
			get
			{
				return (int)(Max * (validHeight - btnThum.Top) / validHeight);
			}
			set
			{
				progress = value;
				if (!IsCanRefresh)
				{
					return;
				}
				//发送命令后3000毫秒内不更新状态，防止跳动
				if ((DateTime.Now - delayDateTime).TotalMilliseconds < DelayTime)
				{
					return;
				}

				if (Max < progress)
				{
					progress = Max;
				}
				var frameThum = btnThum.LayoutParameters as Android.Widget.FrameLayout.LayoutParams;
				frameThum.TopMargin = (int)(1.0f * (Max - progress) / Max * validHeight);
				btnThum.LayoutParameters = frameThum;

				var frameProgress = btnProgressColor.LayoutParameters as Android.Widget.FrameLayout.LayoutParams;
				frameProgress.TopMargin = frameThum.TopMargin + frameThum.Height / 2;
				frameProgress.Height = AndroidView.LayoutParameters.Height - frameProgress.TopMargin;
				btnProgressColor.LayoutParameters = frameProgress;
			}
		}




		/// <summary>
		/// 刷新当前对象
		/// </summary>
		public override void Refresh()
		{
			base.Refresh();
			ProgressColor = progressColor;
			BackgroundColor = BackgroundColor;
			ThumbColor = thumbColor;
			Progress = progress;
		}

		/// <summary>
		/// 滑动休眠时间
		/// </summary>
		public int SleepTime = 0;


		uint progressColor = 0x99000099;
		/// <summary>
		/// 进度视图颜色
		/// </summary>
		/// <value>The color of the progress.</value>
		public uint ProgressColor
		{
			get
			{
				return progressColor;
			}
			set
			{
				progressColor = value;
				if (!IsCanRefresh)
				{
					return;
				}
				byte r, g, b, a;
				r = (byte)(progressColor / 256 / 256 % 256);
				g = (byte)(progressColor / 256 % 256);
				b = (byte)(progressColor % 256);
				a = (byte)(progressColor / 256 / 256 / 256 % 256);

				btnProgressColor.SetBackgroundColor(Android.Graphics.Color.Argb(a, r, g, b));
			}
		}

		uint backgroundColor=0xFFFFFFFF;
		/// <summary>
		/// 进度视图颜色
		/// </summary>
		/// <value>The color of the progress.</value>
		public new uint BackgroundColor
		{
			get
			{
				return backgroundColor;
			}
			set
			{
				backgroundColor = value;
				if (!IsCanRefresh)
				{
					return;
				}
				byte r, g, b, a;
				r = (byte)(backgroundColor / 256 / 256 % 256);
				g = (byte)(backgroundColor / 256 % 256);
				b = (byte)(backgroundColor % 256);
				a = (byte)(backgroundColor / 256 / 256 / 256 % 256);

				btnBackgroundColor.SetBackgroundColor(Android.Graphics.Color.Argb(a, r, g, b));
			}
		}


		uint thumbColor = 0xFFFFFFFF;
		/// <summary>
		/// 滑块颜色
		/// </summary>
		/// <value>The color of the background.</value>
		public uint ThumbColor
		{
			get
			{
				return thumbColor;
			}
			set
			{
				thumbColor = value;
				var gradientDrawable = new Android.Graphics.Drawables.GradientDrawable();
				gradientDrawable.SetCornerRadius(DensityUtil.Dip2Px(12));
				byte r, g, b, a;
				r = (byte)(thumbColor / 256 / 256 % 256);
				g = (byte)(thumbColor / 256 % 256);
				b = (byte)(thumbColor % 256);
				a = (byte)(thumbColor / 256 / 256 / 256 % 256);
				gradientDrawable.SetColor(Android.Graphics.Color.Argb(a, r, g, b).ToArgb());
				btnThum.Background = gradientDrawable;
			}
		}
		int beforValue = 0;
		//将图片移动到点击的位置
		void setButtonLoaction(int y)
		{
			if (!IsCanScrolled)
			{
				return;
			}
			delayDateTime = DateTime.Now;
			if (y < 0)
			{
				y = 0;
			}

			if (validHeight < y)
			{
				y = validHeight;
			}

			var frameThum = btnThum.LayoutParameters as Android.Widget.FrameLayout.LayoutParams;
			frameThum.TopMargin = y;
			btnThum.LayoutParameters = frameThum;

			var frameProgress = btnProgressColor.LayoutParameters as Android.Widget.FrameLayout.LayoutParams;
			frameProgress.TopMargin = frameThum.TopMargin + frameThum.Height / 2;
			frameProgress.Height = AndroidView.LayoutParameters.Height - frameProgress.TopMargin;
			btnProgressColor.LayoutParameters = frameProgress;

			if (dateTime == DateTime.MinValue)
			{
				if (ProgressChanged != null && beforValue != Progress)
				{
					dateTime = DateTime.Now;
					delayDateTime = DateTime.Now;
					ProgressChanged(this, beforValue = Progress);
				}
			}
			else
			{
				//变化大于500毫秒的时候才通知
				if (SleepTime < (DateTime.Now - dateTime).TotalMilliseconds)
				{
					dateTime = DateTime.Now;
					delayDateTime = DateTime.Now;
					if (ProgressChanged != null && beforValue != Progress)
					{
						ProgressChanged(this, beforValue = Progress);
					}
				}
			}
		}

		/// <summary>
		/// 需要重写的视图
		/// </summary>
		class VerticalSeekBarAndroidFrameLayout : Android.Widget.FrameLayout
		{
			View _view;
			public VerticalSeekBarAndroidFrameLayout(Context context, View view)
				: base(context)
			{
				_view = view;
				Touch += (sender, e) =>
				{
					if (_view != null)
					{
						_view.TouchEvent(e.Event);
					}
				};
			}

			/// <summary>
			/// 所有事件本视图全部消化，不通知给子视图
			/// </summary>
			/// <returns><c>true</c>事件已经处理<c>false</c>需要父视图处理</returns>
			/// <param name="ev">Ev.</param>
			public override bool OnInterceptTouchEvent(MotionEvent ev)
			{
				//不需要子视图处理事件，所有的事件自己处理
				return true;
			}

			float startPointX;
			/// <summary>
			/// 执行OnInterceptTouchEvent和OnTouchEvent
			/// </summary>
			/// <returns><c>true</c>事件已经处理<c>false</c>事件没有处理</returns>
			/// <param name="e">E.</param>
			public override bool DispatchTouchEvent(MotionEvent e)
			{
				switch (e.Action)
				{
					case MotionEventActions.Down:
						startPointX = e.RawX;
						requestParentDisallowInterceptTouchEvent(true);
						break;
					case MotionEventActions.Move:
						if (20 < Math.Abs(e.RawX - startPointX))
						{
							requestParentDisallowInterceptTouchEvent(false);
						}
						break;
					case MotionEventActions.Up:
					case MotionEventActions.Cancel:
						requestParentDisallowInterceptTouchEvent(false);
						break;
				}
				return base.DispatchTouchEvent(e);
			}
			/// <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;
				}
			}
		}
	}
}