using MuchInfo.Chart.Infrastructure.Helpers;
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;

namespace MuchInfo.Chart.WPF.Controls.Utilities
{
    /// <summary>
    /// PopupMenu.xaml 的交互逻辑
    /// </summary>
    public partial class PopupMenu : UserControl
    {
        #region Fields

        private static Popup _cachPopup;

        private Popup _Popup;

        private Panel _popupRoot;

        #endregion Fields

        #region Constructors

        public PopupMenu(Panel popupRoot)
        {
            _popupRoot = popupRoot;
            this.InitializeComponent();
            this.Padding = new Thickness(5.0);
            this.MouseLeftButtonDown -= PopupMenu_MouseLeftButtonDown;
            this.MouseLeftButtonDown += PopupMenu_MouseLeftButtonDown;
        }

        #endregion Constructors

        #region Delegates

        public delegate void PopupClosedEventHandler();

        #endregion Delegates

        #region Events

        public event PopupMenu.PopupClosedEventHandler PopupClosed;

        #endregion Events

        #region Properties

        #region Public Properties

        public virtual Popup Popup
        {
            get
            {
                return this._Popup;
            }

            set
            {
                var eventHandler = new EventHandler(this.Popup_Closed);
                bool flag = this._Popup != null;
                if (flag)
                {
                    this._Popup.Closed -= eventHandler;
                }
                this._Popup = value;
                flag = (this._Popup != null);
                if (flag)
                {
                    this._Popup.Closed += eventHandler;
                }
            }
        }

        #endregion Public Properties

        #endregion Properties

        #region Methods

        #region Public Static Methods

        public static bool MenuIsUp()
        {
            return PopupMenu._cachPopup != null;
        }

        #endregion Public Static Methods

        #region Public Methods

        public void AddItem(string txt, ImageSource image, EventHandler onClick)
        {
            var chartMenuItem = new ChartMenuItem(txt, image, onClick);
            chartMenuItem.SetPopupMenu(this);
            this.MainStack.Children.Add(chartMenuItem);
        }

        public void AddItem(string txt, EventHandler onClick)
        {
            var chartMenuItem = new ChartMenuItem(txt, onClick);
            chartMenuItem.SetPopupMenu(this);
            this.MainStack.Children.Add(chartMenuItem);
        }

        public void AddItem(ChartMenuItem item)
        {
            item.SetPopupMenu(this);
            this.MainStack.Children.Add(item);
        }

        public void AddSeperator()
        {
            var seperator = new ChartMenuSeperator();
            this.MainStack.Children.Add(seperator);
        }

        public void Show(MouseEventArgs aPos)
        {
            var offset = new Point(0.0, 0.0);
            this.Show(aPos, offset);
        }

        public void Show(Point aPos)
        {
            if (PopupMenu._cachPopup != null)
            {
                PopupMenu._cachPopup.IsOpen = false;
            }

            this.Popup = PopupManager.CreateOverlay(_popupRoot);
            this.Popup.Child = this;
            this.Popup.HorizontalOffset = aPos.X;
            this.Popup.VerticalOffset = aPos.Y;
            this.Popup.IsOpen = true;
            this.InvalidateArrange();
            this.UpdateLayout();

            GeometryHelper.EnsureControlInApplication(this.Popup, _popupRoot);
            PopupMenu._cachPopup = this.Popup;

            this.MoveLeaveMenuItem();
        }

        public void Show(FrameworkElement relativeTo)
        {
            bool flag = PopupMenu._cachPopup != null;
            if (flag)
            {
                PopupMenu._cachPopup.IsOpen = false;
            }
            this.Popup = PopupManager.CreateOverlay(_popupRoot);
            PopupManager.MovePopup(this.Popup, relativeTo, PopupManager.RelativePositionHoriz.FlushLefts, PopupManager.RelativePositionVert.Below, _popupRoot);
            this.Popup.Child = this;
            this.Popup.IsOpen = true;
            this.InvalidateArrange();
            this.UpdateLayout();

            GeometryHelper.EnsureControlInApplication(this.Popup, _popupRoot);
            PopupMenu._cachPopup = this.Popup;

            this.MoveLeaveMenuItem();
        }

        public void Show(MouseEventArgs aPos, Point offset)
        {
            if (PopupMenu._cachPopup != null)
            {
                PopupMenu._cachPopup.IsOpen = false;
            }
            this.Popup = PopupManager.CreateOverlay(aPos, _popupRoot);
            this.Popup.Child = this;
            this.Popup.IsOpen = true;
            this.InvalidateArrange();
            this.UpdateLayout();

            GeometryHelper.EnsureControlInApplication(this.Popup, _popupRoot);
            PopupMenu._cachPopup = this.Popup;

            this.MoveLeaveMenuItem();
        }

        //public void ShowMainMenu(MainMenuButton MainMenuCtl)
        //{
        //    bool flag = PopupMenu._cachPopup != null;
        //    if (flag)
        //    {
        //        PopupMenu._cachPopup.IsOpen = (false);
        //    }
        //    this.Popup = PopupManager.CreateAppOverlay();
        //    this.Popup.Child = this;
        //    this.Popup.IsOpen = true;
        //    this.Popup.InvalidateArrange();
        //    this.Popup.UpdateLayout();

        //    PopupManager.MovePopup(this.Popup, MainMenuCtl, PopupManager.RelativePositionHoriz.FlushLefts, PopupManager.RelativePositionVert.Below);
        //    GeometryHelper.EnsureControlInApplication(this.Popup);
        //    PopupMenu._cachPopup = this.Popup;

        //    this.MoveLeaveMenuItem();
        //}

        #endregion Public Methods

        #region Internal Methods

        internal void ClosePopup()
        {
            if (this.Popup != null)
            {
                this.Popup.IsOpen = false;
            }
        }

        #endregion Internal Methods

        #region Protected Methods

        protected virtual void OnPopupClosed()
        {
            var handler = PopupClosed;
            if (handler != null) handler();
        }

        #endregion Protected Methods

        #region Private Methods

        private void MoveLeaveMenuItem()
        {
            var children = this.MainStack.Children;
            if (children == null || children.Count == 0) return;
            foreach (var child in children)
            {
                var current = child as ChartMenuItem;
                if (current == null) continue;
                current.HideHover();
            }
        }

        private void PopupMenu_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            //中断事件冒泡， 单击左键不触发你容器事件
            //主要是为了单击popup其它地方时关闭popup.- Popupmanager.cs: Root_MouseLeftButtonDown
            e.Handled = true;
        }

        private void Popup_Closed(object sender, EventArgs e)
        {
            OnPopupClosed();

            var flag = (PopupMenu._cachPopup == this.Popup);
            if (flag)
            {
                PopupMenu._cachPopup = null;
            }
            this.Popup = null;
        }

        #endregion Private Methods

        #endregion Methods
    }
}