/*************************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2007-2013 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at http://xceed.com/wpf_toolkit

   Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids

  ***********************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Xceed.Wpf.AvalonDock.Layout;
using System.Windows.Input;
using System.Windows;
using Xceed.Wpf.AvalonDock.Commands;
using System.Windows.Data;

namespace Xceed.Wpf.AvalonDock.Controls
{
    public class LayoutAnchorableItem : LayoutItem
    {
        LayoutAnchorable _anchorable;
        internal LayoutAnchorableItem()
        {

        }

        internal override void Attach(LayoutContent model)
        {
            _anchorable = model as LayoutAnchorable;
            _anchorable.IsVisibleChanged += new EventHandler(_anchorable_IsVisibleChanged);

            base.Attach(model);
        }

        internal override void Detach()
        {
            _anchorable.IsVisibleChanged -= new EventHandler(_anchorable_IsVisibleChanged);
            _anchorable = null;
            base.Detach();
        }

        protected override void Close()
        {
            var dockingManager = _anchorable.Root.Manager;
            dockingManager._ExecuteCloseCommand(_anchorable);
        }

        ICommand _defaultHideCommand;
        ICommand _defaultAutoHideCommand;
        ICommand _defaultDockCommand;

        protected override void InitDefaultCommands()
        {
            _defaultHideCommand = new RelayCommand((p) => ExecuteHideCommand(p), (p) => CanExecuteHideCommand(p));
            _defaultAutoHideCommand = new RelayCommand((p) => ExecuteAutoHideCommand(p), (p) => CanExecuteAutoHideCommand(p));
            _defaultDockCommand = new RelayCommand((p) => ExecuteDockCommand(p), (p) => CanExecuteDockCommand(p));

            base.InitDefaultCommands();
        }

        protected override void ClearDefaultBindings()
        {
            if (HideCommand == _defaultHideCommand)
                BindingOperations.ClearBinding(this, HideCommandProperty);
            if (AutoHideCommand == _defaultAutoHideCommand)
                BindingOperations.ClearBinding(this, AutoHideCommandProperty);
            if (DockCommand == _defaultDockCommand)
                BindingOperations.ClearBinding(this, DockCommandProperty);

            base.ClearDefaultBindings();
        }

        protected override void SetDefaultBindings()
        {
            if (HideCommand == null)
                HideCommand = _defaultHideCommand;
            if (AutoHideCommand == null)
                AutoHideCommand = _defaultAutoHideCommand;
            if (DockCommand == null)
                DockCommand = _defaultDockCommand;

            Visibility = _anchorable.IsVisible ? Visibility.Visible : System.Windows.Visibility.Hidden;
            base.SetDefaultBindings();
        }


        #region HideCommand

        /// <summary>
        /// HideCommand Dependency Property
        /// </summary>
        public static readonly DependencyProperty HideCommandProperty =
            DependencyProperty.Register("HideCommand", typeof(ICommand), typeof(LayoutAnchorableItem),
                new FrameworkPropertyMetadata(null,
                    new PropertyChangedCallback(OnHideCommandChanged),
                    new CoerceValueCallback(CoerceHideCommandValue)));

        /// <summary>
        /// Gets or sets the HideCommand property.  This dependency property 
        /// indicates the command to execute when an anchorable is hidden.
        /// </summary>
        public ICommand HideCommand
        {
            get { return (ICommand)GetValue(HideCommandProperty); }
            set { SetValue(HideCommandProperty, value); }
        }

        /// <summary>
        /// Handles changes to the HideCommand property.
        /// </summary>
        private static void OnHideCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((LayoutAnchorableItem)d).OnHideCommandChanged(e);
        }

        /// <summary>
        /// Provides derived classes an opportunity to handle changes to the HideCommand property.
        /// </summary>
        protected virtual void OnHideCommandChanged(DependencyPropertyChangedEventArgs e)
        {
        }

        /// <summary>
        /// Coerces the HideCommand value.
        /// </summary>
        private static object CoerceHideCommandValue(DependencyObject d, object value)
        {
            return value;
        }


        private bool CanExecuteHideCommand(object parameter)
        {
            if (LayoutElement == null)
                return false;
            return _anchorable.CanHide;
        }

        private void ExecuteHideCommand(object parameter)
        {
            if (_anchorable != null && _anchorable.Root != null && _anchorable.Root.Manager != null)
                _anchorable.Root.Manager._ExecuteHideCommand(_anchorable);
        }

        #endregion

        #region AutoHideCommand

        /// <summary>
        /// AutoHideCommand Dependency Property
        /// </summary>
        public static readonly DependencyProperty AutoHideCommandProperty =
            DependencyProperty.Register("AutoHideCommand", typeof(ICommand), typeof(LayoutAnchorableItem),
                new FrameworkPropertyMetadata(null,
                    new PropertyChangedCallback(OnAutoHideCommandChanged),
                    new CoerceValueCallback(CoerceAutoHideCommandValue)));

        /// <summary>
        /// Gets or sets the AutoHideCommand property.  This dependency property 
        /// indicates the command to execute when user click the auto hide button.
        /// </summary>
        /// <remarks>By default this command toggles auto hide state for an anchorable.</remarks>
        public ICommand AutoHideCommand
        {
            get { return (ICommand)GetValue(AutoHideCommandProperty); }
            set { SetValue(AutoHideCommandProperty, value); }
        }

        /// <summary>
        /// Handles changes to the AutoHideCommand property.
        /// </summary>
        private static void OnAutoHideCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((LayoutAnchorableItem)d).OnAutoHideCommandChanged(e);
        }

        /// <summary>
        /// Provides derived classes an opportunity to handle changes to the AutoHideCommand property.
        /// </summary>
        protected virtual void OnAutoHideCommandChanged(DependencyPropertyChangedEventArgs e)
        {
        }

        /// <summary>
        /// Coerces the AutoHideCommand value.
        /// </summary>
        private static object CoerceAutoHideCommandValue(DependencyObject d, object value)
        {
            return value;
        }

        private bool CanExecuteAutoHideCommand(object parameter)
        {
            if (LayoutElement == null)
                return false;

            if (LayoutElement.FindParent<LayoutAnchorableFloatingWindow>() != null)
                return false;//is floating

            return _anchorable.CanAutoHide;
        }

        private void ExecuteAutoHideCommand(object parameter)
        {
            if (_anchorable != null && _anchorable.Root != null && _anchorable.Root.Manager != null)
                _anchorable.Root.Manager._ExecuteAutoHideCommand(_anchorable);
        }

        #endregion

        #region DockCommand

        /// <summary>
        /// DockCommand Dependency Property
        /// </summary>
        public static readonly DependencyProperty DockCommandProperty =
            DependencyProperty.Register("DockCommand", typeof(ICommand), typeof(LayoutAnchorableItem),
                new FrameworkPropertyMetadata(null,
                    new PropertyChangedCallback(OnDockCommandChanged),
                    new CoerceValueCallback(CoerceDockCommandValue)));

        /// <summary>
        /// Gets or sets the DockCommand property.  This dependency property 
        /// indicates the command to execute when user click the Dock button.
        /// </summary>
        /// <remarks>By default this command moves the anchorable inside the container pane which previously hosted the object.</remarks>
        public ICommand DockCommand
        {
            get { return (ICommand)GetValue(DockCommandProperty); }
            set { SetValue(DockCommandProperty, value); }
        }

        /// <summary>
        /// Handles changes to the DockCommand property.
        /// </summary>
        private static void OnDockCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((LayoutAnchorableItem)d).OnDockCommandChanged(e);
        }

        /// <summary>
        /// Provides derived classes an opportunity to handle changes to the DockCommand property.
        /// </summary>
        protected virtual void OnDockCommandChanged(DependencyPropertyChangedEventArgs e)
        {
        }

        /// <summary>
        /// Coerces the DockCommand value.
        /// </summary>
        private static object CoerceDockCommandValue(DependencyObject d, object value)
        {
            return value;
        }

        private bool CanExecuteDockCommand(object parameter)
        {
            if (LayoutElement == null)
                return false;
            return LayoutElement.FindParent<LayoutAnchorableFloatingWindow>() != null;
        }

        private void ExecuteDockCommand(object parameter)
        {
            LayoutElement.Root.Manager._ExecuteDockCommand(_anchorable);
        }

        #endregion

        #region Visibility
        ReentrantFlag _visibilityReentrantFlag = new ReentrantFlag();

        protected override void OnVisibilityChanged()
        {
            if (_anchorable != null && _anchorable.Root != null)
            {
                if (_visibilityReentrantFlag.CanEnter)
                {
                    using (_visibilityReentrantFlag.Enter())
                    {
                        if (Visibility == System.Windows.Visibility.Hidden)
                            _anchorable.Hide(false);
                        else if (Visibility == System.Windows.Visibility.Visible)
                            _anchorable.Show();
                    }
                }
            }

            base.OnVisibilityChanged();
        }


        void _anchorable_IsVisibleChanged(object sender, EventArgs e)
        {
            if (_anchorable != null && _anchorable.Root != null)
            {
                if (_visibilityReentrantFlag.CanEnter)
                {
                    using (_visibilityReentrantFlag.Enter())
                    {
                        if (_anchorable.IsVisible)
                            Visibility = Visibility.Visible;
                        else
                            Visibility = Visibility.Hidden;
                    }
                }
            }
        }

        #endregion

        #region CanHide

        /// <summary>
        /// CanHide Dependency Property
        /// </summary>
        public static readonly DependencyProperty CanHideProperty =
            DependencyProperty.Register("CanHide", typeof(bool), typeof(LayoutAnchorableItem),
                new FrameworkPropertyMetadata((bool)true,
                    new PropertyChangedCallback(OnCanHideChanged)));

        /// <summary>
        /// Gets or sets the CanHide property.  This dependency property 
        /// indicates if user can hide the anchorable item.
        /// </summary>
        public bool CanHide
        {
            get { return (bool)GetValue(CanHideProperty); }
            set { SetValue(CanHideProperty, value); }
        }

        /// <summary>
        /// Handles changes to the CanHide property.
        /// </summary>
        private static void OnCanHideChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ((LayoutAnchorableItem)d).OnCanHideChanged(e);
        }

        /// <summary>
        /// Provides derived classes an opportunity to handle changes to the CanHide property.
        /// </summary>
        protected virtual void OnCanHideChanged(DependencyPropertyChangedEventArgs e)
        {
            if (_anchorable != null)
                _anchorable.CanHide = (bool)e.NewValue;
        }

        #endregion


    }
}