Namespace Documents
    Public Class DocumentRow
        Implements IComparable

        ''' <summary>
        ''' GUID to match DocumentRow with Row from Grid/DataTable
        ''' </summary>
        Public Property Id As New Guid
        ''' <summary>
        ''' Counter to ensure consistency and order when writing XML
        ''' </summary>
        Public Property SortKey As Integer

        ''' <summary>
        ''' Tabellen/Elementname aus XML
        ''' </summary>
        Public Property TableName As String

        ''' <summary>
        ''' List of Row Values
        ''' </summary>
        ''' <returns></returns>
        Public Property Fields As Dictionary(Of String, FieldValue)

        Public ReadOnly Property HasErrors As Boolean
            Get
                If Errors.Count > 0 Then
                    Return True
                Else
                    Return False
                End If
            End Get
        End Property

        Public ReadOnly Property Errors As List(Of String)
            Get
                Return Fields.
                    Where(Function(f) f.Value.HasError).
                    Select(Function(f) f.Key).ToList()
            End Get
        End Property

        Public Sub New()
            Id = Guid.NewGuid()
        End Sub

        Public Function CompareTo(other As Object) As Integer Implements IComparable.CompareTo
            Return SortKey.CompareTo(DirectCast(other, DocumentRow).SortKey)
        End Function

        Public Enum FieldError
            None
            MissingValue
            AccountNotFound
            ArticleNotFound
        End Enum

        Public Class FieldValue
            Public Property DataType As Constants.ColumnType = Constants.ColumnType.String
            Public Property [Error] As FieldError = FieldError.None
            Public Property Original As String = ""
            Public Property External As String = ""
            Public Property Final As String = ""
            Public Property IsRequired As Boolean = False
            Public Property IsVirtual As Boolean = False
            Public Property SortKey As Integer = 0

            Public ReadOnly Property HasError As Boolean
                Get
                    Return [Error] <> FieldError.None Or (IsRequired And Final = String.Empty)

                    'Return IsRequired = True And (
                    '    [Error] <> FieldError.None Or Final = String.Empty
                    ')
                End Get
            End Property

            Public Overrides Function ToString() As String
                Return Final
            End Function
        End Class
    End Class

End Namespace