//******************************************************************************************************
//  ErrorLogUserControl.xaml.cs - Gbtc
//
//  Copyright © 2010, Grid Protection Alliance.  All Rights Reserved.
//
//  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
//  the NOTICE file distributed with this work for additional information regarding copyright ownership.
//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may
//  not use this file except in compliance with the License. You may obtain a copy of the License at:
//
//      http://www.opensource.org/licenses/MIT
//
//  Unless agreed to in writing, the subject software distributed under the License is distributed on an
//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
//  License for the specific language governing permissions and limitations.
//
//  Code Modification History:
//  ----------------------------------------------------------------------------------------------------
//  03/27/2012 - prasanthgs
//       Generated original version of source code.
//  04/12/2012 - prasanthgs
//       Reworked as per the comments of codeplex reviewers.
//       Code Optimized.
//  09/10/2012 - Aniket Salver
//       Added paging technique and implemented sorting.
//
//******************************************************************************************************

using System;
using System.ComponentModel;
using System.Linq;
using System.Windows.Controls;
using GSF.TimeSeries.UI.ViewModels;

namespace GSF.TimeSeries.UI.UserControls
{
    /// <summary>
    /// Interaction logic for ErrorLogUserControl.xaml
    /// </summary>
    public partial class ErrorLogUserControl : UserControl
    {
        #region [ Members ]

        private readonly ErrorLogViewModel m_dataContext;
        private DataGridColumn m_sortColumn;
        private string m_sortMemberPath;
        private ListSortDirection m_sortDirection;

        #endregion

        #region [ Constructor ]

        /// <summary>
        /// Constructor for Error user control class.
        /// Creates data source with page size 18.
        /// </summary>
        public ErrorLogUserControl()
        {
            InitializeComponent();
            m_dataContext = new ErrorLogViewModel(18);
            m_dataContext.PropertyChanged += ViewModel_PropertyChanged;
            this.DataContext = m_dataContext;

            m_sortColumn = DataGridList.Columns.Single(column => (string)column.Header == "Sl No.");
            m_sortMemberPath = "ID";
            m_sortDirection = ListSortDirection.Descending;
            m_dataContext.SortData(m_sortMemberPath, m_sortDirection);
        }

        #endregion

        #region [ Methods ]

        private void DataGrid_Sorting(object sender, DataGridSortingEventArgs e)
        {
            if (e.Column.SortMemberPath != m_sortMemberPath)
                m_sortDirection = ListSortDirection.Ascending;
            else if (m_sortDirection == ListSortDirection.Ascending)
                m_sortDirection = ListSortDirection.Descending;
            else
                m_sortDirection = ListSortDirection.Ascending;

            m_sortColumn = e.Column;
            m_sortMemberPath = e.Column.SortMemberPath;
            m_dataContext.SortData(m_sortMemberPath, m_sortDirection);
        }

        private void ViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "ItemsSource")
                Dispatcher.BeginInvoke(new Action(SortDataGrid));
        }

        private void SortDataGrid()
        {
            if ((object)m_sortColumn != null)
            {
                m_sortColumn.SortDirection = m_sortDirection;
                DataGridList.Items.SortDescriptions.Clear();
                DataGridList.Items.SortDescriptions.Add(new SortDescription(m_sortMemberPath, m_sortDirection));
                DataGridList.Items.Refresh();
            }
        }

        #endregion
    }
}