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

   Extended WPF Toolkit

   Copyright (C) 2010-2012 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 

   This program can be provided to you by Xceed Software Inc. under a
   proprietary commercial license agreement for use in non-Open Source
   projects. The commercial version of Extended WPF Toolkit also includes
   priority technical support, commercial updates, and many additional 
   useful WPF controls if you license Xceed Business Suite for WPF.

   Visit http://xceed.com and follow @datagrid on Twitter.

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

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
#if VS2008
using Microsoft.Windows.Controls;
using Microsoft.Windows.Controls.Primitives;
#else
using System.Windows.Controls.Primitives;
#endif

namespace Xceed.Wpf.Toolkit
{
  [TemplatePart( Name = PART_Calendar, Type = typeof( Calendar ) )]
  public class DateTimePicker : DateTimeUpDown
  {
    private const string PART_Calendar = "PART_Calendar";

    #region Members

    private Calendar _calendar;

    #endregion //Members

    #region Properties

    #region IsOpen

    public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register( "IsOpen", typeof( bool ), typeof( DateTimePicker ), new UIPropertyMetadata( false ) );
    public bool IsOpen
    {
      get
      {
        return ( bool )GetValue( IsOpenProperty );
      }
      set
      {
        SetValue( IsOpenProperty, value );
      }
    }

    #endregion //IsOpen

    #region TimeFormat

    public static readonly DependencyProperty TimeFormatProperty = DependencyProperty.Register( "TimeFormat", typeof( TimeFormat ), typeof( DateTimePicker ), new UIPropertyMetadata( TimeFormat.ShortTime ) );
    public TimeFormat TimeFormat
    {
      get
      {
        return ( TimeFormat )GetValue( TimeFormatProperty );
      }
      set
      {
        SetValue( TimeFormatProperty, value );
      }
    }

    #endregion //TimeFormat

    #region TimeFormatString

    public static readonly DependencyProperty TimeFormatStringProperty = DependencyProperty.Register( "TimeFormatString", typeof( string ), typeof( DateTimePicker ), new UIPropertyMetadata( default( String ) ) );
    public string TimeFormatString
    {
      get
      {
        return ( string )GetValue( TimeFormatStringProperty );
      }
      set
      {
        SetValue( TimeFormatStringProperty, value );
      }
    }

    #endregion //TimeFormatString

    #region TimeWatermark

    public static readonly DependencyProperty TimeWatermarkProperty = DependencyProperty.Register( "TimeWatermark", typeof( object ), typeof( DateTimePicker ), new UIPropertyMetadata( null ) );
    public object TimeWatermark
    {
      get
      {
        return ( object )GetValue( TimeWatermarkProperty );
      }
      set
      {
        SetValue( TimeWatermarkProperty, value );
      }
    }

    #endregion //TimeWatermark

    #region TimeWatermarkTemplate

    public static readonly DependencyProperty TimeWatermarkTemplateProperty = DependencyProperty.Register( "TimeWatermarkTemplate", typeof( DataTemplate ), typeof( DateTimePicker ), new UIPropertyMetadata( null ) );
    public DataTemplate TimeWatermarkTemplate
    {
      get
      {
        return ( DataTemplate )GetValue( TimeWatermarkTemplateProperty );
      }
      set
      {
        SetValue( TimeWatermarkTemplateProperty, value );
      }
    }

    #endregion //TimeWatermarkTemplate

    #endregion //Properties

    #region Constructors

    static DateTimePicker()
    {
      DefaultStyleKeyProperty.OverrideMetadata( typeof( DateTimePicker ), new FrameworkPropertyMetadata( typeof( DateTimePicker ) ) );
    }

    public DateTimePicker()
    {
      Keyboard.AddKeyDownHandler( this, OnKeyDown );
      Mouse.AddPreviewMouseDownOutsideCapturedElementHandler( this, OnMouseDownOutsideCapturedElement );
    }

    #endregion //Constructors

    #region Base Class Overrides

    public override void OnApplyTemplate()
    {
      base.OnApplyTemplate();

      if( _calendar != null )
      {
        _calendar.SelectedDatesChanged -= Calendar_SelectedDatesChanged;
      }

      _calendar = GetTemplateChild( PART_Calendar ) as Calendar;

      if( _calendar != null )
      {
        _calendar.SelectedDatesChanged += Calendar_SelectedDatesChanged;
        _calendar.SelectedDate = Value ?? null;
        _calendar.DisplayDate = Value ?? DateTime.Now;
      }
    }

    protected override void OnPreviewMouseUp( MouseButtonEventArgs e )
    {
      if( Mouse.Captured is CalendarItem )
        Mouse.Capture( null );
    }

    protected override void OnValueChanged( DateTime? oldValue, DateTime? newValue )
    {
      if( _calendar != null && _calendar.SelectedDate != newValue )
      {
        _calendar.SelectedDate = newValue;
        _calendar.DisplayDate = newValue ?? DateTime.Now;
      }

      base.OnValueChanged( oldValue, newValue );
    }

    protected override void OnPreviewKeyDown( KeyEventArgs e )
    {
      //if the calendar is open then we don't want to modify the behavior of navigating the calendar control with the Up/Down keys.
      if( !IsOpen )
        base.OnPreviewKeyDown( e );
    }

    #endregion //Base Class Overrides

    #region Event Handlers

    private void OnKeyDown( object sender, KeyEventArgs e )
    {
      switch( e.Key )
      {
        case Key.Escape:
        case Key.Tab:
          {
            CloseDateTimePicker();
            break;
          }
      }
    }

    private void OnMouseDownOutsideCapturedElement( object sender, MouseButtonEventArgs e )
    {
      CloseDateTimePicker();
    }

    void Calendar_SelectedDatesChanged( object sender, SelectionChangedEventArgs e )
    {
      if( e.AddedItems.Count > 0 )
      {
        var newDate = ( DateTime? )e.AddedItems[ 0 ];

        if( (Value != null) && (newDate != null) && newDate.HasValue )
          newDate = new DateTime( newDate.Value.Year, newDate.Value.Month, newDate.Value.Day, Value.Value.Hour, Value.Value.Minute, Value.Value.Second );

        if( !object.Equals( newDate, Value ) )
          Value = newDate;
      }
    }

    #endregion //Event Handlers

    #region Methods

    private void CloseDateTimePicker()
    {
      if( IsOpen )
        IsOpen = false;
      ReleaseMouseCapture();
    }

    #endregion //Methods
  }
}