Imports System.Data.SqlClient
Imports System.IO
Imports DevExpress.XtraBars.Docking
Imports DigitalData.Modules.Logging
Imports EnvelopeGenerator.CommonServices
Imports EnvelopeGenerator.CommonServices.My
Imports EnvelopeGenerator.Domain.Constants
Imports EnvelopeGenerator.Domain.Entities

Public Class EnvelopeEditorController
    Inherits BaseController

    Public ReadOnly Envelope As Envelope = Nothing
    Public ReadOnly EmailService As EmailService
    Public ReadOnly ActionService As ActionService

    Public ReadOnly Thumbnail As Thumbnail

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

        Envelope = CreateEnvelope()
        Thumbnail = New Thumbnail(pState.LogConfig)
        EmailService = New EmailService(pState)
        ActionService = New ActionService(pState, Nothing)
    End Sub

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

        Envelope = pEnvelope
        Envelope.Documents = DocumentModel.List(pEnvelope.Id).ToList()
        Envelope.EnvelopeReceivers = ReceiverModel.ListEnvelopeReceivers(pEnvelope.Id).Cast(Of EnvelopeReceiver)().ToList()

        Thumbnail = New Thumbnail(pState.LogConfig)
        ActionService = New ActionService(pState, Nothing)
    End Sub

#Region "Public"
    Public Function SendEnvelope() As Boolean
        Return ActionService.SendEnvelope(Envelope)
    End Function
    Public Function DocumentRotationChanged() As Boolean
        Return ActionService.SetStatusDocumentRotationChanged(Envelope)
    End Function
    Public Function ResendReceiverInvitation(pEnvelope As Envelope, pReceiver As ReceiverVM) As Boolean
        Return ActionService.ResendReceiver(pEnvelope, pReceiver)
    End Function

    Public Function ValidateEnvelopeForSending(pErrors As List(Of String)) As List(Of String)
        Dim oEnvelopeErrors = pErrors

        If ElementModel.ElementsExist(Envelope.Id) = False Then
            oEnvelopeErrors.Add(Resources.Envelope.Missing_Elements)
        End If

        If ElementModel.OneElementPerReceiverExist(Envelope.Id) = False Then

            For Each receiverItem As EnvelopeReceiver In Envelope.EnvelopeReceivers
                If ElementModel.ElementsExist(Envelope.Id, receiverItem.Envelope.Id) = False Then
                    oEnvelopeErrors.Add(String.Format(Resources.Envelope.Missing_Elements_for_Receiver, receiverItem.Name))
                End If
            Next

        End If

        Return oEnvelopeErrors
    End Function

    Public Function CreateEnvelope() As Envelope
        Dim oEnvelope As New Envelope() With {
            .UserId = State.UserId,
            .User = UserModel.SelectUser(),
            .TfaEnabled = DEF_TF_ENABLED
        }

        If EnvelopeModel.Insert(oEnvelope) Then

            Dim newHistoryEntry As New History With {
                .EnvelopeId = oEnvelope.Id,
                .Status = EnvelopeStatus.EnvelopeCreated,
                .UserReference = oEnvelope.User.Email
            }

            HistoryModel.Insert(newHistoryEntry)

            Return oEnvelope
        Else
            Return Nothing
        End If
    End Function

    Public Function SaveReceivers(pEnvelope As Envelope, pReceiversFromGrid As List(Of ReceiverVM)) As Boolean
        Dim oExistingReceivers As List(Of Receiver) = ReceiverModel.ListReceivers(pReceiversFromGrid).ToList()
        Dim oExistingAddresses = oExistingReceivers.Select(Function(r) r.EmailAddress)
        Logger.Debug($"oExistingReceivers.count: {oExistingReceivers.Count}")
        Logger.Debug($"oExistingAddresses.count: {oExistingAddresses.Count}")
        Dim oNewReceivers = pReceiversFromGrid.Where(Function(r)
                                                         If r.EmailAddress Is Nothing Then Return False
                                                         Return Not oExistingAddresses.Contains(r.EmailAddress)
                                                     End Function).ToList()
        Logger.Debug($"oNewReceivers.count: {oNewReceivers.Count}")
        If CreateNewReceivers(oNewReceivers) = False Then
            Return False
        End If

        Dim oAllReceivers As List(Of Receiver) = ReceiverModel.ListReceivers(pReceiversFromGrid).ToList()

        pEnvelope.EnvelopeReceivers.Clear()

        For Each oReceiver In pReceiversFromGrid
            If oReceiver.EmailAddress Is Nothing Then Continue For
            If oReceiver.Name Is Nothing Then Continue For

            Dim oDbReceiver = oAllReceivers.Where(Function(r) r.EmailAddress = oReceiver.EmailAddress).SingleOrDefault()
            If oDbReceiver IsNot Nothing Then
                oReceiver.Id = oDbReceiver.Id
                oReceiver.Signature = oDbReceiver.Signature
            End If

            pEnvelope.EnvelopeReceivers.Add(oReceiver)
        Next

        Return True
    End Function

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

        Try
            Envelope.Status = EnvelopeStatus.EnvelopeSaved

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

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

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

            If SaveEnvelopeDocuments(Envelope, 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 Async Function CreateDocument(pDocumentFilePath As String) As Threading.Tasks.Task(Of Document)
        Try
            Dim oFixedPath = FixPageRotation.FixPageRotation(pDocumentFilePath)
            If oFixedPath <> pDocumentFilePath Then
                DocumentRotationChanged()
                Logger.Info("PageRotation has been reseted to 0.")
            End If
            oFixedPath = FlattenFormFields.FlattenFormFields(oFixedPath)
            Dim oFileInfo = New FileInfo(oFixedPath)
            Dim oTempFiles As New TempFiles(State.LogConfig)
            Dim oTempFilePath = Path.Combine(oTempFiles._TempPath, Guid.NewGuid().ToString + oFileInfo.Extension)

            Await Helpers.CopyFileAsync(oFileInfo.FullName, oTempFilePath)

            'File.Copy(oFileInfo.FullName, oTempFilePath, True)

            Dim oFileInfoTemp = New FileInfo(oTempFilePath)

            Dim oDocument = New Document() With {
                .Filename = oFileInfoTemp.Name,
                .Filepath = oFileInfoTemp.FullName,
                .FileNameOriginal = oFileInfo.Name,
                .Thumbnail = Thumbnail.GetThumbnailFromPDFFile(oTempFilePath),
                .PageCount = Thumbnail.GetPageCount(oTempFilePath),
                .ByteData = ReadFile(oFixedPath)
            }

            Return oDocument

        Catch ex As Exception
            Logger.Error(ex)
            Logger.Warn($"error in CreateDocument: {ex.Message}")
            Return Nothing
        End Try
    End Function
    'Open file in to a filestream and read data in a byte array. 
    Private Function ReadFile(ByVal sPath As String) As Byte()
        'Initialize byte array with a null value initially. 
        Dim data As Byte() = Nothing
        'Use FileInfo object to get file size. 
        Dim fInfo As New FileInfo(sPath)
        Dim numBytes As Long = fInfo.Length
        'Open FileStream to read file 
        Dim fStream As New FileStream(sPath, FileMode.Open, FileAccess.Read)
        'Use BinaryReader to read file stream into byte array. 
        Dim br As New BinaryReader(fStream)
        'When you use BinaryReader, you need to supply number of bytes to read from file. 
        'In this case we want to read entire file. So supplying total number of bytes. 
        data = br.ReadBytes(CInt(numBytes))
        Return data
    End Function
    Public Function CreateThumbnail(pDocumentPath As String) As Bitmap
        Try
            Dim oThumbNail As Bitmap = Thumbnail.GetThumbnailFromPDFFile(pDocumentPath)

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

    Public Function GetPageCount(pDocumentPath As String) As Integer
        Try
            Return Thumbnail.GetPageCount(pDocumentPath)
        Catch ex As Exception
            Logger.Error(ex)
            Return Nothing
        End Try
    End Function

    Public Overloads Function DeleteDocument(pDocument As Document) As Boolean
        Dim oConnection As SqlConnection = Database.GetConnection
        Dim oTransaction As SqlTransaction = oConnection.BeginTransaction

        If DeleteDocument(pDocument, oTransaction) = True Then
            oTransaction.Commit()
            Return True
        Else
            oTransaction.Rollback()
            Return False
        End If
    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)

                Dim oFileInfo = New FileInfo(oDocumentFilePath)

                oDocument.IsTempFile = False
                oDocument.Filename = oFileInfo.Name
                oDocument.Filepath = oFileInfo.FullName
            Next

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



    Public Function GetEnvelopeReceiverAddresses(pUserId As Integer) As List(Of String)
        Return ReceiverModel.ListAllEnvelopeReceiverAddresses(pUserId)
    End Function

    Public Function CreateNewReceivers(pNewReceivers As List(Of ReceiverVM)) As Boolean
        If pNewReceivers.Count = 0 Then
            Return True
        End If

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

        Try
            InsertReceivers(pNewReceivers, oTransaction)

            oTransaction.Commit()

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

            Return False

        End Try
    End Function
#End Region
    Private Function GetEnvelopePath(pEnvelope As Envelope) As String
        Try
            Dim oTempFiles As New TempFiles(State.LogConfig)
            Dim oTempFolderPath = oTempFiles._TempPath
            Dim oEnvelopePath As String = Path.Combine(oTempFolderPath, 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
    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



    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

    Public Function DeleteReceiver(pReceiver As Receiver) As Boolean
        Dim oConnection As SqlConnection = Database.GetConnection()
        Dim oTransaction As SqlTransaction = oConnection.BeginTransaction()

        Try
            If ReceiverModel.Delete(pReceiver.Id, Envelope.Id, oTransaction) = True Then
                Dim oResult = Envelope.Documents.
                    Select(Function(d) ElementModel.DeleteElements(pReceiver.Id, d.Id, oTransaction)).
                    All(Function(pResult) pResult = True)

                If oResult = False Then
                    Throw New ApplicationException("Could not delete elements!")
                End If
            Else
                Throw New ApplicationException("Could not delete receiver!")
            End If

            oTransaction.Commit()
            Return True

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

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

    Private Sub InsertReceivers(pReceivers As List(Of ReceiverVM), pTransaction As SqlTransaction)
        Dim status = pReceivers.
            Select(Function(r) InsertReceiver(r, pTransaction)).
            All(Function(pResult) pResult = True)

        If Not status Then
            Throw New ApplicationException("Could not insert receivers!")
        End If
    End Sub

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

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

    End Function

    Private Function InsertReceiver(pReceiver As ReceiverVM, pTransaction As SqlTransaction) As Boolean
        Return ReceiverModel.Insert(pReceiver, pTransaction)
    End Function

    Public Function GetLastNameByEmailAdress(pEmailAdress As String) As String
        If (String.IsNullOrEmpty(pEmailAdress) = False) Then
            Return ReceiverModel.GetLastUsedReceiverName(pEmailAdress, Envelope.UserId)
        Else
            Return String.Empty
        End If
    End Function
    Public Function GetLastPhoneByEmailAdress(pEmailAdress As String) As String
        If (String.IsNullOrEmpty(pEmailAdress) = False) Then
            Return ReceiverModel.GetLastUsedReceiverPhone(pEmailAdress, Envelope.UserId)
        Else
            Return String.Empty
        End If
    End Function
End Class