Imports System.Drawing
Imports System.IO
Imports DigitalData.Modules.Base
Imports DigitalData.Modules.Logging
Imports GdPicture14
Imports Newtonsoft.Json
Imports EnvelopeGenerator.CommonServices.Jobs.FinalizeDocument.FinalizeDocumentExceptions
Imports DevExpress.DataProcessing

Namespace Jobs.FinalizeDocument
    Public Class PDFBurner
        Inherits BaseClass

        Private ReadOnly Manager As AnnotationManager
        Private ReadOnly LicenseManager As LicenseManager

        Private Const ANNOTATION_TYPE_IMAGE = "pspdfkit/image"
        Private Const ANNOTATION_TYPE_INK = "pspdfkit/ink"
        Private Const ANNOTATION_TYPE_WIDGET = "pspdfkit/widget"
        Private Property _pdfBurnerParams As PDFBurnerParams

        Public Sub New(pLogConfig As LogConfig, pGDPictureLicenseKey As String, pdfBurnerParams As PDFBurnerParams)
            MyBase.New(pLogConfig)

            LicenseManager = New LicenseManager()
            LicenseManager.RegisterKEY(pGDPictureLicenseKey)

            Manager = New AnnotationManager()

            _pdfBurnerParams = pdfBurnerParams
        End Sub

        Public Function BurnInstantJSONAnnotationsToPDF(pSourceBuffer As Byte(), pInstantJSONList As List(Of String)) As Byte()
            Dim oResult As GdPictureStatus
            Using oSourceStream As New MemoryStream(pSourceBuffer)
                ' Open PDF
                oResult = Manager.InitFromStream(oSourceStream)
                If oResult <> GdPictureStatus.OK Then
                    Throw New BurnAnnotationException($"Could not open document for burning: [{oResult}]")
                End If

                ' Add annotation to PDF
                For Each oJSON In pInstantJSONList
                    Try
                        AddInstantJSONAnnotationToPDF(oJSON)
                    Catch ex As Exception
                        Logger.Warn($"Error in AddInstantJSONAnnotationToPDF - oJson: ")
                        Logger.Warn(oJSON)
                        Throw New BurnAnnotationException($"Adding Annotation failed", ex)
                    End Try
                Next
                oResult = Manager.BurnAnnotationsToPage(RemoveInitialAnnots:=True, VectorMode:=True)
                If oResult <> GdPictureStatus.OK Then
                    Throw New BurnAnnotationException($"Could not burn annotations to file: [{oResult}]")
                End If

                'Save PDF
                Using oNewStream As New MemoryStream()
                    oResult = Manager.SaveDocumentToPDF(oNewStream)
                    If oResult <> GdPictureStatus.OK Then
                        Throw New BurnAnnotationException($"Could not save document to stream: [{oResult}]")
                    End If

                    Manager.Close()

                    Return oNewStream.ToArray()
                End Using
            End Using
        End Function

        Private Sub AddInstantJSONAnnotationToPDF(pInstantJSON As String)
            Dim oAnnotationData = JsonConvert.DeserializeObject(Of AnnotationData)(pInstantJSON)

            oAnnotationData.annotations.Reverse()
            Dim yPosOfSigAnnot = oAnnotationData.annotations.ElementAt(2).bbox.ElementAt(1) - 71.84002685546875 + 7
            Dim isSeal = True   'First element is signature seal

            Dim formFieldIndex = 0
            For Each oAnnotation In oAnnotationData.annotations
                Logger.Debug("Adding AnnotationID: " + oAnnotation.id)

                Select Case oAnnotation.type
                    Case ANNOTATION_TYPE_IMAGE

                        If (isSeal) Then
                            oAnnotation.bbox.Item(1) = yPosOfSigAnnot
                        End If

                        AddImageAnnotation(oAnnotation, oAnnotationData.attachments)
                        Exit Select

                    Case ANNOTATION_TYPE_INK
                        AddInkAnnotation(oAnnotation)
                        Exit Select

                    Case ANNOTATION_TYPE_WIDGET
                        'Add form field values
                        Dim formFieldValue = oAnnotationData.formFieldValues.FirstOrDefault(Function(fv) fv.name = oAnnotation.id)
                        If formFieldValue IsNot Nothing AndAlso Not _pdfBurnerParams.IgnoredLabels.Contains(formFieldValue.value) Then
                            AddFormFieldValue(oAnnotation, formFieldValue, formFieldIndex)
                            formFieldIndex += 1
                        End If
                        Exit Select
                End Select

                isSeal = False
            Next

        End Sub

        Private Function AddImageAnnotation(pAnnotation As Annotation, pAttachments As Dictionary(Of String, Attachment)) As Void
            Dim oAttachment = pAttachments.Where(Function(a) a.Key = pAnnotation.imageAttachmentId).
                    SingleOrDefault()

            ' Convert pixels to Inches
            Dim oBounds = pAnnotation.bbox.Select(AddressOf ToInches).ToList()

            Dim oX = oBounds.Item(0)
            Dim oY = oBounds.Item(1)
            Dim oWidth = oBounds.Item(2)
            Dim oHeight = oBounds.Item(3)

            Manager.SelectPage(pAnnotation.pageIndex + 1)
            Manager.AddEmbeddedImageAnnotFromBase64(oAttachment.Value.binary, oX, oY, oWidth, oHeight)
        End Function

        Private Function AddInkAnnotation(pAnnotation As Annotation) As Void
            Dim oSegments = pAnnotation.lines.points
            Dim oColor = ColorTranslator.FromHtml(pAnnotation.strokeColor)
            Manager.SelectPage(pAnnotation.pageIndex + 1)

            For Each oSegment As List(Of List(Of Single)) In oSegments
                Dim oPoints = oSegment.
                Select(AddressOf ToPointF).
                ToArray()

                Manager.AddFreeHandAnnot(oColor, oPoints)
            Next
        End Function

        Private Function AddFormFieldValue(pAnnotation As Annotation, formFieldValue As FormFieldValue, index As Integer) As Void
            ' Convert pixels to Inches
            Dim oBounds = pAnnotation.bbox.Select(AddressOf ToInches).ToList()

            Dim oX = oBounds.Item(0)
            Dim oY = oBounds.Item(1) + _pdfBurnerParams.YOffset * index + _pdfBurnerParams.TopMargin
            Dim oWidth = oBounds.Item(2)
            Dim oHeight = oBounds.Item(3)

            Manager.SelectPage(pAnnotation.pageIndex + 1)
            ' Add the text annotation
            Dim ant = Manager.AddTextAnnot(oX, oY, oWidth, oHeight, formFieldValue.value)

            ' Set the font properties
            ant.FontName = _pdfBurnerParams.FontName
            ant.FontSize = _pdfBurnerParams.FontSize
            ant.FontStyle = _pdfBurnerParams.FontStyle
            Manager.SaveAnnotationsToPage()
        End Function

        Private Function ToPointF(pPoints As List(Of Single)) As PointF
            Dim oPoints = pPoints.Select(AddressOf ToInches).ToList()
            Return New PointF(oPoints.Item(0), oPoints.Item(1))
        End Function

        Private Function ToInches(pValue As Double) As Double
            Return pValue / 72
        End Function

        Private Function ToInches(pValue As Single) As Single
            Return pValue / 72
        End Function

        Friend Class AnnotationData
            Public Property annotations As List(Of Annotation)

            Public ReadOnly Property AnnotationsByReceiver As IEnumerable(Of List(Of Annotation))
                Get
                    Return annotations _
                        .Where(Function(annot) annot.hasStructuredID).ToList() _
                        .GroupBy(Function(a) a.receiverId) _
                        .Select(Function(g) g.ToList())
                End Get
            End Property

            Public ReadOnly Property UnstructuredAnnotations As IEnumerable(Of List(Of Annotation))
                Get
                    Return annotations _
                        .Where(Function(annot) Not annot.hasStructuredID).ToList() _
                        .GroupBy(Function(a) a.receiverId) _
                        .Select(Function(g) g.ToList())
                End Get
            End Property

            Public Property attachments As Dictionary(Of String, Attachment)
            Public Property formFieldValues As List(Of FormFieldValue)
        End Class

        Friend Class Annotation

            Private _id As String = Nothing

            Public envelopeId As Integer = Nothing

            Public receiverId As Integer = Nothing

            Public index As Integer = Nothing

            Public internalType As String = Nothing

            Public hasStructuredID As Boolean = False

            Public Property id As String
                Get
                    Return _id
                End Get
                Set(value As String)
                    _id = value

                    If String.IsNullOrWhiteSpace(_id) Then
                        Throw New BurnAnnotationException("The identifier of annotation is null or empty.")
                    End If

                    Dim parts As String() = value.Split("#"c)

                    If (parts.Length <> 4) Then
                        Return
                        'Throw New BurnAnnotationException($"The identifier of annotation has more or less than 4 sub-part. Id: {_id}")
                    End If

                    If Not Integer.TryParse(parts(0), envelopeId) Then
                        Throw New BurnAnnotationException($"The envelope ID of annotation is not integer. Id: {_id}")
                    End If

                    If Not Integer.TryParse(parts(1), receiverId) Then
                        Throw New BurnAnnotationException($"The receiver ID of annotation is not integer. Id: {_id}")
                    End If

                    If Not Integer.TryParse(parts(2), index) Then
                        Throw New BurnAnnotationException($"The index of annotation is not integer. Id: {_id}")
                    End If

                    internalType = parts(3)

                    hasStructuredID = True
                End Set
            End Property

            Public Property bbox As List(Of Double)
            Public Property type As String
            Public Property isSignature As Boolean
            Public Property imageAttachmentId As String
            Public Property lines As Lines
            Public Property pageIndex As Integer
            Public Property strokeColor As String
        End Class

        Friend Class Lines
            Public Property points As List(Of List(Of List(Of Single)))
        End Class

        Friend Class Attachment
            Public Property binary As String
            Public Property contentType As String
        End Class

        Friend Class FormFieldValue
            Public Property name As String
            Public Property value As String
        End Class
    End Class
End Namespace