Imports System.Drawing
Imports System.ComponentModel
Imports System.Windows.Forms
Imports DevExpress.XtraEditors
Imports DevExpress.XtraEditors.Repository
Imports DevExpress.XtraEditors.Registrator
Imports DevExpress.XtraEditors.ViewInfo
Imports DevExpress.XtraEditors.Drawing
Imports DevExpress.Accessibility
Imports DevExpress.XtraEditors.Controls
Imports DevExpress.XtraGrid.Views.Base
Imports DevExpress.XtraGrid.Columns

<ToolboxItem(True)>
Public Class LookupControl3
    Inherits GridLookUpEdit

    <DesignerSerializationVisibility(DesignerSerializationVisibility.Content)>
    Public Shadows ReadOnly Property Properties As RepositoryItemLookupControl3
        Get
            Return TryCast(MyBase.Properties, RepositoryItemLookupControl3)
        End Get
    End Property

    Public Overrides ReadOnly Property EditorTypeName As String
        Get
            Return RepositoryItemLookupControl3.CustomEditName
        End Get
    End Property

    Shared Sub New()
        RepositoryItemLookupControl3.RegisterLookupControl()
    End Sub

    Private Sub LookupControl3_EditValueChanging(sender As Object, e As ChangingEventArgs) Handles Me.EditValueChanging
        e.Cancel = True
    End Sub

    Shadows WithEvents fProperties As RepositoryItemGridLookUpEdit
    Friend WithEvents fPropertiesView As DevExpress.XtraGrid.Views.Grid.GridView
End Class

<UserRepositoryItem("RegisterLookupControl3")>
Public Class RepositoryItemLookupControl3
    Inherits RepositoryItemGridLookUpEdit

    Shared Sub New()
        RegisterLookupControl()
    End Sub

    Public Sub New()
        SetDropdownButtonEnabled(_MultiSelect)

        UpdateSelectedValues(New List(Of String))
    End Sub

    Private Const NAME_DATATABLE_INTERNAL = "__INTERNAL_DATATABLE__"
    Private Const TAG_DROPDOWN = "openDropdown"
    Private Const TAG_BUTTON_LOOKUP_FORM = "openLookupForm"

    Public Const CustomEditName As String = "LookupControl3"

    Private _R As Resources.ResourceManager = My.Resources.Strings.ResourceManager
    Private _SelectedValues As New List(Of String)
    Private _MultiSelect As Boolean = False
    Private _ReadOnly As Boolean = False

    Public Property AllowAddNewValues As Boolean
    Public Property PreventDuplicates As Boolean

    Public Delegate Sub SelectedValuesChangedHandler(sender As Object, SelectedValues As List(Of String))
    Public Event SelectedValuesChanged As SelectedValuesChangedHandler

    Public Overrides ReadOnly Property EditorTypeName As String
        Get
            Return CustomEditName
        End Get
    End Property

    Public Overloads Property [ReadOnly] As Boolean
        Get
            Return _ReadOnly
        End Get
        Set(value As Boolean)
            SetFormButtonEnabled(Not value)
            _ReadOnly = value
        End Set
    End Property

    Public Property MultiSelect As Boolean
        Get
            Return _MultiSelect
        End Get
        Set(value As Boolean)
            SetDropdownButtonEnabled(value)
            _MultiSelect = value
        End Set
    End Property

    Public Property SelectedValues As List(Of String)
        Get
            Return _SelectedValues
        End Get
        Set(value As List(Of String))
            UpdateSelectedValues(value)
        End Set
    End Property

    Public Shared Sub RegisterLookupControl()
        Dim img As Image = Nothing
        Dim oClassInfo = New EditorClassInfo(
            CustomEditName,
            GetType(LookupControl3),
            GetType(RepositoryItemLookupControl3),
            GetType(GridLookUpEditBaseViewInfo),
            New ButtonEditPainter(),
            True,
            img,
            GetType(ButtonEditAccessible)
        )
        EditorRegistrationInfo.Default.Editors.Add(oClassInfo)


    End Sub

    Private Sub SetFormButtonEnabled(pVisible As Boolean)
        Dim oButton As EditorButton = Buttons.
                Where(Function(b) b.Tag = TAG_BUTTON_LOOKUP_FORM).
                FirstOrDefault()

        If oButton IsNot Nothing Then
            oButton.Visible = pVisible
        End If
    End Sub

    Private Sub SetDropdownButtonEnabled(pVisible As Boolean)
        Dim oButton As EditorButton = Buttons.
                Where(Function(b) b.Tag = TAG_DROPDOWN).
                FirstOrDefault()

        If oButton IsNot Nothing Then
            oButton.Visible = pVisible
            ActionButtonIndex = oButton.Index
        End If
    End Sub

    ''' <summary>
    ''' Prevents Editvalue changing when multiselect is true
    ''' </summary>
    Private Sub HandleEditValueChanging(sender As Object, e As ChangingEventArgs)
        If MultiSelect Then
            e.Cancel = True
        End If
    End Sub

    Private Sub UpdateSelectedValues(Values As List(Of String))
        If Values Is Nothing Then
            Exit Sub
        End If

        Values.RemoveAll(Function(v) String.IsNullOrEmpty(v))

        If MultiSelect = True Then
            Select Case Values.Count
                Case 0
                    NullText = String.Format(_R.GetString("LookupControl_NoRecords"))
                Case 1
                    NullText = Values.FirstOrDefault()
                    OwnerEdit.EditValue = Values.FirstOrDefault()
                Case Else
                    NullText = String.Format(_R.GetString("LookupControl_NRecords"), Values.Count)
            End Select
        Else
            Select Case Values.Count
                Case 0
                    NullText = String.Format(_R.GetString("LookupControl_NoRecords"))
                Case Else
                    NullText = Values.FirstOrDefault()
                    ' JJ at 07.05.2021 
                    ' Setting the EditValue Is crucial for making the Control work as a Cell Editor!!!
                    OwnerEdit.EditValue = Values.FirstOrDefault()
            End Select
        End If

        ' If No external Datasource is supplied, create one containing the currently selected values
        ' If the current datasource is the internal one, update it
        If DataSource Is Nothing OrElse (TypeOf DataSource Is DataTable AndAlso DirectCast(DataSource, DataTable).TableName = NAME_DATATABLE_INTERNAL) Then
            Dim oDataTable As New DataTable() With {
                .TableName = NAME_DATATABLE_INTERNAL
            }
            oDataTable.Columns.Add(New DataColumn("Data", GetType(String)))

            For Each oValue In Values
                Dim oRow = oDataTable.NewRow()
                oRow.Item(0) = oValue
                oDataTable.Rows.Add(oRow)
            Next

            DataSource = oDataTable
        End If

        _SelectedValues = Values

        RaiseEvent SelectedValuesChanged(Me, Values)
    End Sub

    Protected Overrides Function ShouldSerializeNullText() As Boolean
        Return False
    End Function

    Public Overrides Sub CreateDefaultButton()
        Dim oButtons As New List(Of EditorButton) From {
            New EditorButton() With {
                .Kind = ButtonPredefines.Combo,
                .Tag = TAG_DROPDOWN,
                .Width = 25
            },
            New EditorButton() With {
                .Kind = ButtonPredefines.Search,
                .Tag = TAG_BUTTON_LOOKUP_FORM,
                .Width = 25
            }
        }

        Buttons.AddRange(oButtons.ToArray)
    End Sub

    Private Function GetLookupForm() As frmLookupGrid
        Dim oForm As New frmLookupGrid() With {
            .MultiSelect = MultiSelect,
            .AddNewValues = AllowAddNewValues,
            .PreventDuplicates = PreventDuplicates,
            .DataSource = DataSource,
            .SelectedValues = SelectedValues,
            .StartPosition = FormStartPosition.Manual
        }
        Dim oScreen = Screen.FromControl(oForm)
        oForm.Location = GetFormLocation(oForm.Height, oForm.Width, oScreen)

        Return oForm
    End Function

    Private Function GetFormLocation(pFormHeight As Integer, pFormWidth As Integer, pScreen As Screen) As Point
        ' This is the location on the same height like the Lookup Control
        Dim oDefaultLocation = OwnerEdit.PointToScreen(New Point(OwnerEdit.Width, 0))
        Dim oScreenheight = pScreen.Bounds.Height

        If oScreenheight < (oDefaultLocation.Y + pFormHeight) Then
            Return OwnerEdit.PointToScreen(New Point(OwnerEdit.Width, -pFormHeight + OwnerEdit.Height))
        End If

        Return oDefaultLocation
    End Function

    Protected Overrides Sub RaiseButtonClick(e As ButtonPressedEventArgs)
        MyBase.RaiseButtonClick(e)

        If e.Button.Tag = TAG_BUTTON_LOOKUP_FORM Then
            Using oForm = GetLookupForm()
                Dim oResult = oForm.ShowDialog()

                If oResult = Windows.Forms.DialogResult.OK Then
                    Dim oValues = oForm.SelectedValues
                    UpdateSelectedValues(oValues)

                    If oForm.NewValues.Count > 0 AndAlso TypeOf DataSource Is DataTable Then
                        Dim oTable As DataTable = DirectCast(DataSource, DataTable)

                        If oTable.TableName <> NAME_DATATABLE_INTERNAL Then
                            For Each oValue In oForm.NewValues
                                Dim oRow = oTable.NewRow()
                                oRow.Item(0) = oValue
                                oTable.Rows.Add(oRow)
                            Next
                        End If
                    End If
                End If
            End Using
        End If
    End Sub

    Public Overrides Sub Assign(item As RepositoryItem)
        BeginUpdate()
        Try
            MyBase.Assign(item)
            Dim source As RepositoryItemLookupControl3 = TryCast(item, RepositoryItemLookupControl3)
            If source Is Nothing Then
                Return
            End If
        Finally
            EndUpdate()
        End Try
    End Sub

    Private Shadows Sub Popup(sender As LookupControl3, e As EventArgs) Handles Me.BeforePopup
        Try
            Dim oView As ColumnView = sender.Properties.View

            If DataSource IsNot Nothing AndAlso DataSource.Columns.Count > 0 Then
                Dim oFirstColumn As String = DataSource.Columns.Item(0).ColumnName
                Dim oOperator = New DevExpress.Data.Filtering.InOperator(oFirstColumn, SelectedValues)

                View.ActiveFilterCriteria = oOperator
                View.OptionsView.ShowFilterPanelMode = ShowFilterPanelMode.Never
            End If
        Catch ex As Exception
            'noop
        End Try
    End Sub

    Public Sub HandleQueryPopup(sender As Object, e As CancelEventArgs) Handles Me.QueryPopUp
        If MultiSelect = False Then
            e.Cancel = True
        End If
    End Sub

    Protected Overrides Sub RaiseQueryPopUp(e As CancelEventArgs)
        If MultiSelect = False Then
            e.Cancel = True
        End If
    End Sub
End Class