Imports System.Xml
Imports System.Text
Imports System.Net.Http
Imports DigitalData.Modules.Logging
Imports MultiTool.Shared.Documents
Imports MultiTool.Shared.Templates.GeneralConfig
Imports MultiTool.Shared.Winline.Entities

Namespace Winline
    Public Class WebServiceData
        Inherits BaseClass

        Private ReadOnly Config As WebServiceConfig
        Private ReadOnly Serializer As Serializer
        Private ReadOnly AppDataPath As String

        Public Event WebServiceProgress As EventHandler(Of String)

        Public Sub New(pLogConfig As LogConfig, pWebserviceConfig As WebServiceConfig, pAppDataPath As String)
            MyBase.New(pLogConfig, pLogConfig.GetLogger())
            Serializer = New Serializer(pLogConfig)
            Config = pWebserviceConfig
            AppDataPath = pAppDataPath
        End Sub

        Public Async Function TransferDocumentToWinline(pDocument As Document, pMandator As Mandator, Optional pIsTest As Boolean = False) As Task(Of Boolean)
            Dim oBytes As Byte() = GetBytesFromDocument(pDocument)
            Dim oWS = Config

            ' --- Get and create path for request/response files

            Dim oPath As String = GetBaseWebServicePath()
            If IO.Directory.Exists(oPath) = False Then
                IO.Directory.CreateDirectory(oPath)
            End If

            RaiseEvent WebServiceProgress(Me, "Einstellungen laden")

            ' --- Build all teh filenamez and pathz

            Dim oBaseFileName As String = GetBaseFilenameForRequest()
            Dim oFileName = GetXmlFilenameWithSuffix(oBaseFileName, "Request", "xml")

            ' Relative Path for Webservice Call
            Dim oImportRelativeFilePath = IO.Path.Combine(GetDateSubDirectoryPath(oWS.ImportRelativePath), oFileName)

            ' Absolute Path to copy Request file
            Dim oImportAbsolutePath = IO.Path.Combine(oWS.ImportBasePath, oWS.ImportRelativePath)
            Dim oImportAbsoluteFilePath = IO.Path.Combine(GetDateSubDirectoryPath(oImportAbsolutePath), oFileName)

            ' --- Serialize Data into XML string

            RaiseEvent WebServiceProgress(Me, "Dateien schreiben")

            Dim oOutputFilePath = IO.Path.Combine(GetBaseWebServicePath(), oFileName)
            IO.File.WriteAllBytes(oOutputFilePath, oBytes)

            ' --- Copy file to Winline Import Directory

            Try
                IO.File.Copy(oOutputFilePath, oImportAbsoluteFilePath, True)
            Catch ex As Exception
                Logger.Error(ex)
                Throw ex
            End Try

            ' --- Prepare URL and HTTP Client
            Dim oTemplateType = pDocument.TemplateType
            Dim oTemplateName = pDocument.TemplateName

            ' ActionCode: Should this be a test or not?
            ' 0 = Test call
            ' 1 = Real call
            Dim oActionCode = 1
            If pIsTest = True Then
                oActionCode = 0
            End If

            ' Byref: Should data be supplied as file or as string?
            ' 0 = As String
            ' 1 = As File (relative to Winline Server directory)
            Dim oByref = 1

            Dim oURL As String = $"{oWS.BaseUrl}/ewlservice/import?User={oWS.Username}&Password={oWS.Password}&Company={pMandator.Id}&Type={oTemplateType}&Vorlage={oTemplateName}&ActionCode={oActionCode}&Byref={oByref}&Data={oImportRelativeFilePath}"
            Dim oClient As New HttpClient()

            Logger.Info("Creating HTTP Request to [{0}]", oWS.BaseUrl)

            RaiseEvent WebServiceProgress(Me, "Anfrage absenden")

            ' --- Bring the action!
            Try
                Dim oResponse As HttpResponseMessage = Await oClient.GetAsync(oURL)
                Await HandleResponse(oResponse, oPath, oBaseFileName)

                Return True
            Catch ex As Exception
                Logger.Error(ex)
                Throw ex
            Finally
                oClient.Dispose()
            End Try
        End Function

        Private Async Function HandleResponse(pResponse As HttpResponseMessage, pPath As String, pBaseFileNAme As String) As Task
            pResponse.EnsureSuccessStatusCode()
            Dim oResponseBody As String = Await pResponse.Content.ReadAsStringAsync()
            Dim oContentType = pResponse.Content.Headers.ContentType.MediaType
            Dim oSerializer = Serializer.GetSerializer(GetType(Templates.Entities.MESOWebServiceResult))

            RaiseEvent WebServiceProgress(Me, "Antwort verarbeiten")

            Select Case oContentType
                Case "text/xml"
                    WriteResponseFile(pPath, pBaseFileNAme, oResponseBody, "xml")

                    Dim oBytes As Byte() = Encoding.UTF8.GetBytes(oResponseBody)
                    Using oStream As New IO.MemoryStream(oBytes)
                        Dim oResponseObject As Templates.Entities.MESOWebServiceResult = oSerializer.Deserialize(oStream)
                        Dim oErrorStrings As New List(Of String)

                        For Each oDetails As Templates.Entities.MESOWebServiceResultResultDetails In oResponseObject.ResultDetails

                            If oDetails.Success = True Then
                                Logger.Info("KeyValue: [{0}]", oDetails.KeyValue)
                                Logger.Info("VoucherNumber: [{0}]", oDetails.VoucherNumber)
                            Else
                                Logger.Warn("ErrorCode: [{0}]", oDetails.ErrorCode)
                                Logger.Warn("ErrorText: [{0}]", oDetails.ErrorText)
                                oErrorStrings.Add($"[{oDetails.ErrorCode}] {oDetails.ErrorText}")
                            End If
                        Next

                        If oResponseObject.OverallSuccess = False Then
                            Dim oMessage = $"Request to Webservice was unsuccessful:{vbNewLine}{vbNewLine}{String.Join(vbNewLine, oErrorStrings.ToArray)}"

                            Throw New ApplicationException(oMessage)
                        End If
                    End Using

                Case "text/html"
                    WriteResponseFile(pPath, pBaseFileNAme, oResponseBody, "txt")

                    Throw New ApplicationException(oResponseBody)

                Case Else
                    Throw New ApplicationException(oResponseBody)
            End Select
        End Function

        Private Function WriteResponseFile(pPath As String, pBaseFileName As String, pResponseBody As String, pExtension As String)
            Try
                Dim oRequestFileName As String = GetXmlFilenameWithSuffix(pBaseFileName, "Response", pExtension)
                Dim oFilePath As String = IO.Path.Combine(pPath, oRequestFileName)
                IO.File.WriteAllText(oFilePath, pResponseBody)

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

        Private Function GetBytesFromDocument(pDocument As Document) As Byte()
            ' TODO: should "Lief_Name" be included here?
            Dim oFilteredFields As New List(Of String) From {
                "Fakt_Name"
            }

            Using oStream As New IO.MemoryStream()
                Dim w = XmlWriter.Create(oStream)

                w.WriteStartDocument()
                w.WriteStartElement("MESOWebService")
                w.WriteAttributeString("Template", pDocument.TemplateName)
                w.WriteAttributeString("TemplateType", pDocument.TemplateType)
                w.WriteAttributeString("option", pDocument.Option)
                w.WriteAttributeString("printVoucher", pDocument.PrintVoucher)

                pDocument.Rows.Sort()

                For Each oRow In pDocument.Rows
                    w.WriteStartElement(oRow.Name)

                    For Each oField As KeyValuePair(Of String, DocumentRow.FieldValue) In oRow.Fields
                        If oField.Value.Final = String.Empty Then
                            Continue For
                        End If

                        If oFilteredFields.Contains(oField.Key) Then
                            Continue For
                        End If

                        w.WriteStartElement(oField.Key)
                        w.WriteValue(oField.Value.Final)
                        w.WriteEndElement() ' Field
                    Next

                    w.WriteEndElement() ' Row
                Next
                w.WriteEndElement() ' MESOWebService
                w.WriteEndDocument() ' Document
                w.Close()

                Return oStream.ToArray()
            End Using
        End Function

        Private Function GetBaseWebServicePath() As String
            Return IO.Path.Combine(AppDataPath, "WebService")
        End Function

        Private Function GetBaseFilenameForRequest() As String
            Return $"{Now:yyyy-MM-dd_hh-mm-ffff}"
        End Function

        Private Function GetXmlFilenameWithSuffix(pBaseString As String, pSuffix As String, pExtension As String)
            Return $"{pBaseString}-{pSuffix}.{pExtension}"
        End Function

        Private Function GetDateSubDirectoryPath(pBasePath As String)
            Dim oDirectoryPath As String = Now.ToString("yyyy\\MM\\dd")
            Dim oFullPath As String = IO.Path.Combine(pBasePath, oDirectoryPath)

            If IO.Directory.Exists(oFullPath) = False Then
                Try
                    IO.Directory.CreateDirectory(oFullPath)
                    Return oFullPath
                Catch ex As Exception
                    Logger.Error(ex)
                    Return Nothing
                End Try
            Else
                Return oFullPath
            End If
        End Function

    End Class

End Namespace