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

namespace Shared
{
    /// <summary>
    /// 位置布局 带下拉刷新
    /// </summary>
    public class VerticalRefreshLayout : ViewGroup
    {

        public Action BeginHeaderRefreshingAction;
        //public Action BeginFooterRefreshingAction;
        MyRefreshScrolViewLayout mUIScrollView;

        public VerticalRefreshLayout()
        {
            mUIScrollView = new MyRefreshScrolViewLayout(this) { };

            viewGroup = mUIScrollView;

            realViewGroup = mUIScrollView;

            _isCanHeaderRefresh = true;

            MJRefreshNormalHeader header = new MJRefreshNormalHeader();
            //隐藏提示文字 
            //header.LastUpdatedTimeLabel.Hidden = true;
            //header.StateLabel.Hidden = true;

            mUIScrollView.SetMj_header(header);

            header.RefreshingBlock = () =>
            {
                BeginHeaderRefreshingAction?.Invoke();
            };



            //header.SetTitle(NSBundle_MJRefresh.Mj_localizedStringForKey(NSBundle_MJRefresh.Mj_refreshBundle(NSBundle.MainBundle), "MJRefreshHeaderIdleText"), MJRefreshState.Idle);
            //header.SetTitle(NSBundle_MJRefresh.Mj_localizedStringForKey(NSBundle_MJRefresh.Mj_refreshBundle(NSBundle.MainBundle), "MJRefreshHeaderPullingText"), MJRefreshState.Pulling);
            //header.SetTitle(NSBundle_MJRefresh.Mj_localizedStringForKey(NSBundle_MJRefresh.Mj_refreshBundle(NSBundle.MainBundle), "MJRefreshHeaderRefreshingText"), MJRefreshState.Refreshing);

            //header.AutomaticallyChangeAlpha = true;


        }

        //private void AddFotterView() {

        //    MJRefreshAutoNormalFooter footer = new MJRefreshAutoNormalFooter();
        //    mUIScrollView.SetMj_footer(footer);

        //    footer.RefreshingBlock = async () =>
        //    {
        //        BeginFooterRefreshingAction?.Invoke();
        //    };

        //}



        //***************************下拉刷新***************************
        /// <summary>
        /// 是否支持下拉刷新
        /// </summary>
        bool _isCanHeaderRefresh;
        private bool IsCanHeaderRefresh
        {
            get
            {
                return _isCanHeaderRefresh;
            }
            set
            {
                _isCanHeaderRefresh = value;

            }
        }


        /// <summary>
        /// 头开始刷新
        /// </summary>
        public void BeginHeaderRefreshing()
        {
            if (!IsCanHeaderRefresh) return;


            if (!mUIScrollView.Mj_header().Refreshing)
            {
                mUIScrollView.Mj_header().BeginRefreshing();
            }
        }

        /// <summary>
        /// 头结束刷新
        /// </summary>
        public void EndHeaderRefreshing()
        {
            if (!IsCanHeaderRefresh) return;

            if (mUIScrollView.Mj_header().Refreshing)
            {
                mUIScrollView.Mj_header().EndRefreshing();
            }
        }


        /// <summary>
        /// 是否显示滚动条
        /// </summary>
 
        public bool VerticalScrollBarEnabled
        {
            get
            {
                return mUIScrollView.ShowsVerticalScrollIndicator;
            }
            set
            {
                mUIScrollView.ShowsVerticalScrollIndicator = value;

            }
        }



        /// <summary>
        /// 垂直方向滚动视图
        /// </summary>
        class MyRefreshScrolViewLayout : UIScrollView
        {
            [Weak] VerticalRefreshLayout _view;
            public MyRefreshScrolViewLayout(VerticalRefreshLayout view)
            {
                this._view = view;
                Scrolled += (sender, e) =>
                {
                    this._view?.ScrolledEventHandler?.Invoke(this, new MouseEventArgs { X = (float)(sender as MyRefreshScrolViewLayout).ContentOffset.X, Y = (float)(sender as MyRefreshScrolViewLayout).ContentOffset.Y });
                };
            }
            /// <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));
            }
            /// <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);
            }
        }

        /// <summary>
        /// 增加控件
        /// </summary>
        /// <param name="view">子控件</param>
        public override void AddChidren(View view)
        {
            base.AddChidren(view);
            ReLocation();
        }

        /// <summary>
        /// 重新排位置及设备内容大小
        /// </summary>
        public virtual void ReLocation()
        {
            if (0 == viewList.Count)
            {
                return;
            }
            var frame1 = viewList[0].RealView.Frame;
            frame1.Y = 0;
            viewList[0].RealView.Frame = frame1;

            for (int i = 1; i < viewList.Count; i++)
            {
                var frame = viewList[i].RealView.Frame;
                frame.Y = viewList[i - 1].RealView.Frame.Bottom;
                viewList[i].RealView.Frame = frame;
            }

            (realViewGroup as MyRefreshScrolViewLayout).ContentSize = new CoreGraphics.CGSize(0, viewList[viewList.Count - 1].Bottom <= Height ? Height + 1 : viewList[viewList.Count - 1].Bottom);
        }

        /// <summary>
        /// 移除所有的视图
        /// </summary>
        public override void RemoveAll()
        {
            base.RemoveAll();

            ReLocation();
        }

        /// <summary>
        /// 移除当前视图
        /// </summary>
        /// <param name="view">当前视图</param>
        internal override void Remove(View view)
        {
            base.Remove(view);

            ReLocation();
        }

        /// <summary>
        /// 移除指定索引
        /// </summary>
        /// <param name="index">索引</param>
        public override void RemoveAt(int index)
        {
            base.RemoveAt(index);
            ReLocation();
        }

        ///// <summary>
        ///// 是否允许滑动
        ///// </summary>
        ///// <value><c>true</c> if scroll enabled; otherwise, <c>false</c>.</value>
        //public bool ScrollEnabled
        //{
        //    get
        //    {
        //        return (realViewGroup as MyRefreshScrolViewLayout).ScrollEnabled;
        //    }
        //    set
        //    {
        //        (realViewGroup as MyRefreshScrolViewLayout).ScrollEnabled = value;
        //    }
        //}

        ///// <summary>
        ///// 是否正在滑动
        ///// </summary>
        ///// <value><c>true</c> if decelerating; otherwise, <c>false</c>.</value>
        //public bool Decelerating
        //{
        //    get
        //    {
        //        return (realViewGroup as MyRefreshScrolViewLayout).Decelerating;
        //    }
        //}

        /// <summary>
        /// 滑动事件
        /// </summary>
        public EventHandler<MouseEventArgs> ScrolledEventHandler;


    }
}