Imports System.Windows
Imports System.Windows.Input
Imports System.Windows.Threading
Imports EgtWPFLib5

Public Class LoadingWndVM
   Inherits VMBase

#Region "FIELDS & PROPERTIES"

   Enum LoadingTypes As Integer
      NULL = 0
      OPEN = 1
      IMPORT = 2
   End Enum

   Delegate Sub CallbackLoadingDlg(ByRef CurrStep As Integer, ByRef StepText As String, ByRef nProgress As Integer, ByRef nNextProgress As Integer, ByRef MainWindow_IsActive As Boolean, ByRef bClose As Boolean)

   Friend Event m_CloseWindow(bDialogResult As Boolean)
   Friend Event m_ActivateWindow()

   Private m_CallbackLoading As CallbackLoadingDlg
   Private m_Waiting_Timer As New DispatcherTimer

   ' numero di passaggi di caricamento
   Private m_nSteps As Integer
   ' titolo testo di caricamento
   Private m_TotText As String
   ' numero passaggio corrente
   Private m_CurrStep As Integer
   ' testo del passaggio corrente
   Private m_StepText As String
   ' indice d'inizio di questo passaggio
   Private m_nStartProgress As Integer
   ' indice d'inizio del prossimo passaggio
   Private m_nNextProgress As Integer
   ' variabile che indica richiesta chiusura della finestra
   Private m_bClosing As Boolean = False
   Private m_bMainWindow_IsActive As Boolean = True

   Private m_StepProgress_Value As Double = 0
   Public Property StepProgress_Value As Double
      Get
         Return m_StepProgress_Value
      End Get
      Set(value As Double)
         m_StepProgress_Value = value
      End Set
   End Property

   Private m_TotProgress_Value As Double = 0
   Public Property TotProgress_Value As Double
      Get
         Return Math.Floor(m_TotProgress_Value)
      End Get
      Set(value As Double)
         m_TotProgress_Value = value
      End Set
   End Property

   Private m_StepText_Visibility As Visibility
   Public ReadOnly Property StepText_Visibility As Visibility
      Get
         Return m_StepText_Visibility
      End Get
   End Property

   Private m_StepProgress_Visibility As Visibility
   Public ReadOnly Property StepProgress_Visibility As Visibility
      Get
         Return m_StepProgress_Visibility
      End Get
   End Property

#Region "Messages"

   Public ReadOnly Property TotText_Msg As String
      Get
         Return If(m_nSteps > 0, m_TotText & " (" & m_CurrStep & "/" & m_nSteps & ")", m_TotText)
      End Get
   End Property

   Public ReadOnly Property StepText_Msg As String
      Get
         Return m_StepText
      End Get
   End Property

   Public ReadOnly Property TotProgress_Msg As String
      Get
         Return m_TotProgress_Value.ToString("0.#") & "%"
      End Get
   End Property

#End Region    ' Messages

   ' Definizione comandi
   Private m_cmdCancel As ICommand

#End Region    ' FIELDS & PROPERTIES

   Sub New(Steps As Integer, TotText As String, callback As CallbackLoadingDlg)
      m_nSteps = Steps
      m_TotText = TotText
      m_CallbackLoading = callback
      m_bClosing = False
      If Steps = 1 Then
         m_StepText_Visibility = Visibility.Collapsed
         m_StepProgress_Visibility = Visibility.Collapsed
      Else
         m_StepText_Visibility = Visibility.Visible
         m_StepProgress_Visibility = Visibility.Visible
      End If
      ' imposto contatore
      m_Waiting_Timer.Interval = TimeSpan.FromMilliseconds(200)
      AddHandler m_Waiting_Timer.Tick, AddressOf WaitingTimer_Tick
   End Sub

   Public Sub UpdateProgress(CurrStep As Integer, StepText As String, nStartProgress As Integer, nNextProgress As Integer)
      m_CurrStep = CurrStep
      m_StepText = StepText
      m_StepProgress_Value = nStartProgress
      m_nNextProgress = nNextProgress
      NotifyPropertyChanged(NameOf(StepText_Msg))
      NotifyPropertyChanged(NameOf(TotText_Msg))
   End Sub

   Public Overridable Sub StartFunction()
      m_Waiting_Timer.Start()
   End Sub

   Protected Overridable Sub WaitingTimer_Tick()
      ' leggo eventuali nuovi valori
      Dim CurrStep As Integer = 0
      Dim StepText As String = ""
      Dim nStartProgress As Integer = 0
      Dim nNextProgress As Integer = 0
      Dim bMainWindow_IsActive As Boolean = True
      Dim bClose As Boolean = False
      m_CallbackLoading(CurrStep, StepText, nStartProgress, nNextProgress, bMainWindow_IsActive, bClose)
      If bMainWindow_IsActive <> m_bMainWindow_IsActive Then
         RaiseEvent m_ActivateWindow()
      End If
      If m_bClosing Then
         Close()
         Dispatcher.CurrentDispatcher.InvokeShutdown()
         Return
      ElseIf bClose Then
         m_bClosing = True
         ' mostro completamento caricamento
         m_CurrStep = m_nSteps
         m_StepProgress_Value = 100
         m_TotProgress_Value = 100
         m_Waiting_Timer.Interval = TimeSpan.FromMilliseconds(1000)
      Else
         If m_CurrStep <> CurrStep Then
            If m_StepProgress_Value < 100 Then
               m_StepProgress_Value = 100
            ElseIf m_StepProgress_Value = 100 Then
               m_StepProgress_Value = 0
               m_CurrStep = CurrStep
               m_StepText = StepText
               m_nStartProgress = nStartProgress
               m_nNextProgress = nNextProgress
            End If
         Else
            ' incremento Step corrente
            If m_StepProgress_Value < 80 Then
               m_StepProgress_Value += 1
            ElseIf m_StepProgress_Value < 90 Then
               m_StepProgress_Value += 0.4
            ElseIf m_StepProgress_Value < 98 Then
               m_StepProgress_Value += 0.1
            Else
               m_StepProgress_Value += 0.01
            End If
         End If
         ' calcolo totale
         Dim dStepStart As Double = If(m_CurrStep > 1, m_nStartProgress, 0)
         Dim dStepEnd As Double = m_nNextProgress
         m_TotProgress_Value = dStepStart + ((dStepEnd - dStepStart) / 100 * m_StepProgress_Value)
      End If
      ' aggiorno grafica
      NotifyPropertyChanged(NameOf(StepText_Msg))
      NotifyPropertyChanged(NameOf(TotText_Msg))
      NotifyPropertyChanged(NameOf(StepProgress_Value))
      NotifyPropertyChanged(NameOf(TotProgress_Value))
      NotifyPropertyChanged(NameOf(TotProgress_Msg))
   End Sub

   Public Sub Close()
      ' fermo timer 
      m_Waiting_Timer.Stop()
      ' chiudo finestra
      RaiseEvent m_CloseWindow(True)
   End Sub

#Region "COMMANDS"

#Region "Cancel"

   ''' <summary>
   ''' Returns a command that do Open.
   ''' </summary>
   Public ReadOnly Property Cancel_Command As ICommand
      Get
         If m_cmdCancel Is Nothing Then
            m_cmdCancel = New Command(AddressOf Cancel)
         End If
         Return m_cmdCancel
      End Get
   End Property

   ''' <summary>
   ''' Execute the Open.  This method is invoked by the OpenCommand.
   ''' </summary>
   Friend Sub Cancel()
   End Sub

#End Region ' Cancel

#End Region    ' COMMANDS

End Class