Imports System.Data.Common
Imports System.Data.SqlClient
Imports System.IO
Imports DigitalData.Modules.Base
Imports DigitalData.Modules.Database
Imports DigitalData.Modules.Logging
Imports EnvelopeGenerator.Common
Imports EnvelopeGenerator.Common.Constants

Public Class EnvelopeEditorController
    Inherits BaseClass

    Private ReadOnly Database As MSSQLServer
    Private ReadOnly State As State = Nothing

    Private EnvelopeModel As EnvelopeModel
    Private DocumentModel As DocumentModel
    Private ReceiverModel As ReceiverModel
    Private ElementModel As ElementModel
    Private HistoryModel As HistoryModel
    Private UserModel As UserModel

    Public ReadOnly Envelope As Envelope = Nothing

    Public Sub New(pState As State)
        MyBase.New(pState.LogConfig)

        Database = pState.Database
        State = pState

        InitializeModels(pState)

        Envelope = CreateEnvelope()
    End Sub

    Public Sub New(pState As State, pEnvelope As Envelope)
        MyBase.New(pState.LogConfig)

        Database = pState.Database
        State = pState

        InitializeModels(pState)

        Envelope = pEnvelope
        Envelope.Documents = DocumentModel.List(pEnvelope.Id)
        Envelope.Receivers = ReceiverModel.ListEnvelopeReceivers(pEnvelope.Id)
    End Sub

    Private Sub InitializeModels(pState As State)
        EnvelopeModel = New EnvelopeModel(pState)
        DocumentModel = New DocumentModel(pState)
        ReceiverModel = New ReceiverModel(pState)
        ElementModel = New ElementModel(pState)
        HistoryModel = New HistoryModel(pState)
        UserModel = New UserModel(pState)
    End Sub

#Region "Public"
    Public Function CreateEnvelope() As Envelope
        Dim oEnvelope As New Envelope() With {
            .UserId = State.UserId,
            .User = UserModel.SelectUser()
        }
        If EnvelopeModel.Insert(oEnvelope) Then

            Dim newHistoryEntry As New EnvelopeHistoryEntry With {
                .EnvelopeId = oEnvelope.Id,
                .Status = HistoryStatus.Created,
                .ActionTitle = "Envelope erzeugt",
                .ActionDescription = "Envelope wurde erzeugt"
            }
            'TODO .UserEmailAddress = oEnvelope.User.Email ' TODO - fehlt noch

            Return oEnvelope
        Else
            Return Nothing
        End If
    End Function

    Public Function SaveEnvelope(pEnvelope As Envelope) As Boolean
        Dim oConnection = Database.GetConnection()
        Dim oTransaction = oConnection.BeginTransaction(IsolationLevel.ReadUncommitted)

        Try
            pEnvelope.Status = EnvelopeStatus.Saved

            If SaveEnvelopeDocumentsToFilesystem(pEnvelope) = False Then
                Throw New ApplicationException
            End If

            If EnvelopeModel.Update(pEnvelope, oTransaction) = False Then
                Throw New ApplicationException
            End If

            If SaveEnvelopeReceivers(pEnvelope, oTransaction) = False Then
                Throw New ApplicationException
            End If

            If SaveEnvelopeDocuments(pEnvelope, oTransaction) = False Then
                Throw New ApplicationException
            End If

            oTransaction.Commit()

            Return True

        Catch ex As Exception
            Logger.Error(ex)
            oTransaction.Rollback()

            Return False
        End Try
    End Function

    Public Function CleanupEnvelope() As Boolean
        If Envelope.Status = Common.Constants.EnvelopeStatus.Created Then
            'TODO: Delete Documents and Receivers and elements
            Return EnvelopeModel.Delete(Envelope)

        Else
            Return True
        End If
    End Function

    Public Function CreateDocument(pDocumentFilePath As String) As EnvelopeDocument
        Try
            Dim oFileInfo = New FileInfo(pDocumentFilePath)
            Dim oTempDirectoryPath = Path.GetTempPath()
            Dim oTempFilePath = Path.Combine(oTempDirectoryPath, oFileInfo.Name)
            File.Copy(oFileInfo.FullName, oTempFilePath)

            Dim oDocument = New EnvelopeDocument() With {
                .FileInfo = New FileInfo(oTempFilePath)
            }

            Return oDocument

        Catch ex As Exception
            Logger.Error(ex)
            Return Nothing
        End Try
    End Function

    Public Function DeleteDocument(pDocument As EnvelopeDocument) As Boolean
        Dim oSql = "DELETE FROM [dbo].[TBSIG_ENVELOPE_DOCUMENT] WHERE FILENAME = @FILENAME AND ENVELOPE_ID = @ENVELOPE_ID"
        Dim oCommand As New SqlCommand(oSql)
        oCommand.Parameters.Add("FILENAME", SqlDbType.NVarChar).Value = pDocument.Filename
        oCommand.Parameters.Add("ENVELOPE_ID", SqlDbType.Int).Value = Envelope.Id
        'TODO: delete document file, from temp and from documentpath

        Return Database.ExecuteNonQuery(oCommand)
    End Function

    Public Function SaveEnvelopeDocumentsToFilesystem(pEnvelope As Envelope) As Boolean
        Try
            For Each oDocument In pEnvelope.Documents.Where(Function(d) d.IsTempFile)

                Dim oEnvelopePath = GetEnvelopePath(pEnvelope)

                If oEnvelopePath Is Nothing Then
                    Return False
                End If

                Dim oDocumentFilePath = Path.Combine(oEnvelopePath, oDocument.Filename)
                File.Copy(oDocument.Filepath, oDocumentFilePath)
                File.Delete(oDocument.Filepath)

                oDocument.IsTempFile = False
                oDocument.FileInfo = New FileInfo(oDocumentFilePath)
            Next

            Return True
        Catch ex As Exception
            Logger.Error(ex)
            Return False
        End Try
    End Function

    Private Function GetEnvelopePath(pEnvelope As Envelope) As String
        Try
            Dim oEnvelopePath As String = Path.Combine(State.DbConfig.DocumentPath, pEnvelope.Uuid)

            If Not Directory.Exists(oEnvelopePath) Then
                Directory.CreateDirectory(oEnvelopePath)
            End If

            Return oEnvelopePath

        Catch ex As Exception
            Logger.Error(ex)
            Return Nothing
        End Try
    End Function
#End Region

    Private Function SaveEnvelopeDocuments(pEnvelope As Envelope, pTransaction As SqlTransaction) As Boolean
        Try
            Return pEnvelope.Documents.
                Where(Function(d) d.Id = 0).
                Select(Function(d) DocumentModel.Insert(pEnvelope, d, pTransaction)).
                All(Function(pResult) pResult = True)

        Catch ex As Exception
            Logger.Error(ex)
            Return False
        End Try
    End Function

    Public Function CreateEnvelopeReceivers(pReceivers As List(Of EnvelopeReceiver)) As Boolean
        Dim oExistingReceivers As List(Of EnvelopeReceiver) = ReceiverModel.ListReceivers(pReceivers)
        Dim oExistingAddresses = oExistingReceivers.Select(Function(r) r.Email)

        Dim oNewReceivers = pReceivers.
                Where(Function(r) Not oExistingAddresses.Contains(r.Email)).ToList()

        Dim oOldReceivers = pReceivers.
                Where(Function(r) oExistingAddresses.Contains(r.Email)).ToList()

        For Each oReceiver In oOldReceivers
            oReceiver.Id = oExistingReceivers.
                    Where(Function(r) r.Email = oReceiver.Email).
                    Select(Function(r) r.Id).
                    FirstOrDefault()
        Next

        Dim oConnection = Database.GetConnection()
        Dim oTransaction = oConnection.BeginTransaction()

        Try

            If InsertReceivers(oNewReceivers, oTransaction) = False Then
                Throw New ApplicationException("Could not insert receivers!")
            End If

            oTransaction.Commit()

            Return True
        Catch ex As Exception
            Logger.Error(ex)
            oTransaction.Rollback()

            Return False

        End Try
    End Function

    Private Function SaveEnvelopeReceivers(pEnvelope As Envelope, pTransaction As SqlTransaction) As Boolean
        Try
            If pEnvelope.Id = Nothing Then
                Throw New ArgumentNullException("EnvelopeId")
            End If

            If AssignReceivers(pEnvelope, pTransaction) = False Then
                Return False
            End If

            Return True
        Catch ex As Exception
            Logger.Error(ex)
            Return False
        End Try
    End Function

    Private Function DeleteReceiver(pReceiver As EnvelopeReceiver) As Boolean
        Try

        Catch ex As Exception

        End Try
    End Function

    Public Function ElementsExist(pDocumentId As Integer, pReceiverId As Integer) As Boolean
        Return ElementModel.ElementsExist(pDocumentId, pReceiverId)
    End Function

    Private Function InsertReceivers(pReceivers As List(Of EnvelopeReceiver), pTransaction As SqlTransaction) As Boolean
        Try
            Return pReceivers.
                Select(Function(r) InsertReceiver(r, pTransaction)).
                All(Function(pResult) pResult = True)

        Catch ex As Exception
            Logger.Error(ex)
            Return False
        End Try
    End Function

    Private Function AssignReceivers(pEnvelope As Envelope, pTransaction As SqlTransaction) As Boolean
        If ReceiverModel.Unassign(pEnvelope, pTransaction) = False Then
            Return False
        End If

        Return pEnvelope.Receivers.
            Select(Function(r) ReceiverModel.Assign(pEnvelope, r, pTransaction)).
            All(Function(pResult) pResult = True)

    End Function

    Private Function InsertReceiver(pReceiver As EnvelopeReceiver, pTransaction As SqlTransaction) As Boolean
        If pReceiver.HasId = False Then
            Return ReceiverModel.Insert(pReceiver, pTransaction)
        Else
            Return True
        End If
    End Function

End Class