Imports DigitalData.Modules.Database
Imports DigitalData.Modules.EDMI.API
Imports DigitalData.Modules.EDMI.API.EDMIServiceReference
Imports DigitalData.Modules.Logging
Imports DigitalData.Modules.Language.Utils

Public Class DataWithFallback
    Private _Logger As Logger
    Private _Client As Client
    Private _DatabaseEDM As MSSQLServer
    Private _DatabaseIDB As MSSQLServer
    Private _Type As DatabaseType

    Public Enum DatabaseType
        ECM
        IDB
    End Enum

    Public Sub New(LogConfig As LogConfig, Client As Client, DatabaseECM As MSSQLServer, DatabaseIDB As MSSQLServer)
        _Logger = LogConfig.GetLogger()
        _Client = Client
        _DatabaseEDM = DatabaseECM
        _DatabaseIDB = DatabaseIDB
    End Sub

    Public Function GetDatatable(DataTable As String, FilterExpression As String, SortByColumn As String, FallbackSQL As String, FallbackType As DatabaseType, Optional ForceFallback As Boolean = False) As DataTable
        Try
            Dim oResult As DataTable = Nothing

            If ForceFallback = False Then
                Dim oTableResult As TableResult = _Client.GetDatatableByName(DataTable, FilterExpression, SortByColumn)

                If oTableResult Is Nothing OrElse oTableResult.OK = False Then
                    _Logger.Warn("Datatable [{0}] could not be fetched from AppServer Cache. Falling back to direct Database Access.")
                End If

                Return oTableResult.Table
            Else
                Return GetDatatableFromDatabase(FallbackSQL, FallbackType)
            End If
        Catch ex As Exception
            _Logger.Error(ex)
            Return Nothing
        End Try
    End Function

    Private Function GetDatatableFromDatabase(SQLCommand As String, DatabaseType As DatabaseType)
        Try
            Select Case DatabaseType
                Case DatabaseType.ECM
                    Return _DatabaseEDM.GetDatatable(SQLCommand)

                Case DatabaseType.IDB
                    Return _DatabaseIDB.GetDatatable(SQLCommand)

                Case Else
                    Return Nothing

            End Select
        Catch ex As Exception
            _Logger.Error(ex)
            Return Nothing

        End Try
    End Function

    Public Function GetUserData(UserName As String, ModuleCode As String, Client As Integer) As UserData
        Dim oSQL = $"SELECT * FROM FNDD_CHECK_USER_MODULE('{UserName}','{ModuleCode}',{Client})"
        Dim oTable As DataTable = GetDatatable("TBDD_USER_MODULE", $"USERNAME = '{UserName.ToLower}' AND MODULE_SHORT = '{ModuleCode}'", "", oSQL, DatabaseType.ECM)

        If oTable Is Nothing Then
            Return Nothing
        End If

        If oTable.Rows.Count = 0 Then
            Return Nothing
        End If

        Dim oRow As DataRow = oTable.Rows.Item(0)
        Dim oUserData As New UserData With {
            .Id = NotNull(oRow, "USER_ID", -1),
            .Surname = NotNull(oRow, "USER_SURNAME", String.Empty),
            .Prename = NotNull(oRow, "USER_PRENAME", String.Empty),
            .Shortname = NotNull(oRow, "USER_SHORTNAME", String.Empty),
            .Email = NotNull(oRow, "USER_EMAIL", String.Empty),
            .Language = NotNull(oRow, "USER_LANGUAGE", "de-DE"),
            .DateFormat = NotNull(oRow, "USER_DATE_FORMAT", "dd.MM.yyyy")
        }
    End Function

End Class