using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.ComponentModel;

namespace Aiwaz.Editor.Controls
{
    public partial class PropertyGrid : HeaderedContentControl
    {
        private object selectedObject = null;

        public PropertyGrid()
        {
            InitializeComponent();
            searchTextBox.TextChanged += new TextChangedEventHandler(searchTextBox_TextChanged);
        }

        #region PropertyGrid related stuff
        public object SelectedObject{
            get { return selectedObject; }
            set { selectedObject = value; SelectedObjectHelper(selectedObject,null); }
        }

        public void SelectedObjectHelper(object value,EventArgs e) {
            if (!Application.Current.Dispatcher.CheckAccess())
            {
                Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
                                                           new EventHandler(SelectedObjectHelper), value, e);
            }
            else
            {
                this.PropertyPanel.Children.Clear(); //clear propertypanel
                
                foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(value))
                {
                    if (!property.IsBrowsable) continue; //could also check for browsableattribute, but this one's shorter

                    PropertyItem currentProperty = new PropertyItem();
                    currentProperty.PropertyName = property.Name;        
                    Binding b = new Binding(property.Name);
                    b.Source = selectedObject;
                    b.Mode = property.IsReadOnly ? BindingMode.OneWay : BindingMode.TwoWay;
                   
                    currentProperty.SetBinding(PropertyItem.PropertyValueProperty, b);
                    currentProperty.OnActive += new EventHandler<DescriptionEventArgs>(currentProperty_OnActive);
                    
                    foreach (Attribute attribute in property.Attributes)
                    {
                        if (attribute.GetType() == typeof(DescriptionAttribute))
                        {
                            currentProperty.PropertyDescription = ((DescriptionAttribute)attribute).Description;
                        }
                       if (attribute.GetType() == typeof(CategoryAttribute)) {
                            currentProperty.PropertyCategory = ((CategoryAttribute)attribute).Category;
                        }
                    }      
                    PropertyPanel.Children.Add(currentProperty); //add the propertyitem
                }
            }            
        }
        #endregion
        #region events
        void searchTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            string filterText = searchTextBox.Text.ToLower(); //we don't want to be case sensitive
            foreach (PropertyItem pi in PropertyPanel.Children)
            {   //hide PropertyItem if it does not contain filter text
                pi.Visibility = (pi.PropertyName.ToLower().Contains(filterText) || filterText.Equals(string.Empty)) ? Visibility.Visible : Visibility.Collapsed;
            }
        }
      
        void currentProperty_OnActive(object sender, DescriptionEventArgs e)
        {
            if (!Application.Current.Dispatcher.CheckAccess()){
                Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
                                                           new EventHandler<DescriptionEventArgs>(currentProperty_OnActive),sender, e);
            }else{
                this.descriptionTextBlock.Text = e.Description;
            }
        }
        #endregion
    }
}