Imports System.Text
Imports System.Text.RegularExpressions



<Serializable>
Public Class DolbyVisionMetadataFile
    Private _autoCropThresholdBegin As Integer = 1000
    Private _autoCropThresholdEnd As Integer = 1000
    Private _lastWriteTime As DateTime = Nothing
    Private _lastWriteTimeL5 As DateTime = Nothing

    Public ReadOnly Property Path As String = Nothing
    Public ReadOnly Property Edits As New List(Of RpuEdit)
    Public ReadOnly Property Presets As New List(Of RpuPreset)

    Public ReadOnly Property LastWriteTime As DateTime
        Get
            Return _lastWriteTime
        End Get
    End Property

    Public ReadOnly Property LastWriteTimeL5 As DateTime
        Get
            Return _lastWriteTimeL5
        End Get
    End Property


    Public ReadOnly Property Level5JsonFilePath As String
        Get
            Return If(String.IsNullOrWhiteSpace(Path), "", $"{Path.DirAndBase()}_L5.json")
        End Get
    End Property

    Public ReadOnly Property EditorConfigFilePath As String
        Get
            Return If(String.IsNullOrWhiteSpace(Path), "", $"{Path.DirAndBase()}_Config.json")
        End Get
    End Property

    Public ReadOnly Property CroppedRpuFilePath As String
        Get
            Return If(String.IsNullOrWhiteSpace(Path), "", $"{Path.DirAndBase()}_Cropped.rpu")
        End Get
    End Property

    Public ReadOnly Property HasLevel5Changed As Boolean
        Get
            Return Level5JsonFilePath.FileExists() AndAlso _lastWriteTimeL5 <> File.GetLastWriteTimeUtc(Level5JsonFilePath)
        End Get
    End Property

    Public ReadOnly Property Crop As Padding
        Get
            Select Case p.AutoCropDolbyVisionMode
                Case AutoCropDolbyVisionMode.Automatic
                    Return GetAutoCrop(_autoCropThresholdBegin, _autoCropThresholdEnd)
                Case AutoCropDolbyVisionMode.ManualThreshold
                    Return GetCrop(p.AutoCropDolbyVisionThresholdBegin, p.AutoCropDolbyVisionThresholdEnd)
                Case Else
                    Throw New NotImplementedException(NameOf(AutoCropDolbyVisionMode))
            End Select
        End Get
    End Property


    Private Sub New()
    End Sub

    Public Sub New(filePath As String)
        Me.Path = filePath
        Me._lastWriteTime = File.GetLastWriteTimeUtc(filePath)

        WriteLevel5Export(True, False)
        ReadLevel5Export()
    End Sub

    Public Function GetAutoCrop() As Padding
        Return GetAutoCrop(_autoCropThresholdBegin, _autoCropThresholdEnd)
    End Function

    Public Function GetAutoCrop(thresholdBegin As Integer, thresholdEnd As Integer) As Padding
        thresholdBegin = Math.Max(0, thresholdBegin)
        thresholdEnd = Math.Max(0, thresholdEnd)

        If Not Edits?.Any() Then Return New Padding(0)
        If Not Presets?.Any() Then Return New Padding(0)

        Dim newCrop As New Padding(Integer.MaxValue)
        Dim entries = Edits.Join(Presets, Function(edit) edit.Id, Function(preset) preset.Id, Function(edit, preset) New With {edit.StartFrame, edit.EndFrame, edit.Id, preset.Offset}).OrderBy(Function(x) x.StartFrame)

        For i = 0 To entries.Count() - 1
            Dim entry = entries.ElementAt(i)
            Dim same = entries.Where(Function(x) x.Id = entry.Id).Count()
            Dim take = True

            take = If(take AndAlso i = 0 AndAlso same = 1 AndAlso entry.Offset = Padding.Empty AndAlso entry.EndFrame < thresholdBegin, False, take)
            take = If(take AndAlso i = entries.Count() - 1 AndAlso same = 1 AndAlso entry.Offset = Padding.Empty AndAlso entry.StartFrame > entry.EndFrame - thresholdEnd, False, take)

            If take Then
                newCrop.Left = Math.Min(newCrop.Left, entry.Offset.Left)
                newCrop.Top = Math.Min(newCrop.Top, entry.Offset.Top)
                newCrop.Right = Math.Min(newCrop.Right, entry.Offset.Right)
                newCrop.Bottom = Math.Min(newCrop.Bottom, entry.Offset.Bottom)
            End If
        Next

        Return newCrop
    End Function

    Public Function GetCrop() As Padding
        Return GetCrop(0, 0)
    End Function

    Public Function GetCrop(thresholdBegin As Integer, thresholdEnd As Integer) As Padding
        thresholdBegin = Math.Max(0, thresholdBegin)
        thresholdEnd = Math.Max(0, thresholdEnd)

        If Not Edits?.Any() Then Return New Padding(0)
        If Not Presets?.Any() Then Return New Padding(0)

        Dim newCrop As New Padding(Integer.MaxValue)
        Dim frames = Edits.OrderByDescending(Function(x) x.EndFrame).First().EndFrame
        Dim entries = Edits.Join(Presets, Function(edit) edit.Id, Function(preset) preset.Id, Function(edit, preset) New With {edit.StartFrame, edit.EndFrame, preset.Offset})

        For Each entry In entries
            If entry.EndFrame > thresholdBegin AndAlso entry.StartFrame <= (frames - thresholdEnd) Then
                newCrop.Left = Math.Min(newCrop.Left, entry.Offset.Left)
                newCrop.Top = Math.Min(newCrop.Top, entry.Offset.Top)
                newCrop.Right = Math.Min(newCrop.Right, entry.Offset.Right)
                newCrop.Bottom = Math.Min(newCrop.Bottom, entry.Offset.Bottom)
            End If
        Next

        Return newCrop
    End Function

    Public Sub RefreshLevel5Data()
        If Not HasLevel5Changed Then Exit Sub
        If Not (p.AutoCropMode = AutoCropMode.DolbyVisionOnly OrElse p.AutoCropMode = AutoCropMode.Always) Then Exit Sub

        ReadLevel5Export()
    End Sub

    Public Sub ReadLevel5Export()
        If Not Path?.FileExists() Then Return
        If Not Level5JsonFilePath.FileExists() Then Return

        Edits.Clear()
        Presets.Clear()

        Try
            Dim jsonContent = Level5JsonFilePath.ReadAllText()
            Dim strippedJsonContent = jsonContent.Right("presets").Left("edits")
            strippedJsonContent = Regex.Replace(strippedJsonContent, "\s", "")
            Dim presetMatches = Regex.Matches(strippedJsonContent, "\{.+?:(?<id>\d+),.+?:(?<left>\d+),.+?:(?<right>\d+),.+?:(?<top>\d+),.+?:(?<bottom>\d+)\}")

            If presetMatches.Count = 0 Then Return

            For Each match As Match In presetMatches
                Dim offset = New Padding(match.Groups("left").Value.ToInt(), match.Groups("top").Value.ToInt(), match.Groups("right").Value.ToInt(), match.Groups("bottom").Value.ToInt())
                Presets.Add(New RpuPreset(match.Groups("id").Value.ToInt(), offset))
            Next

            strippedJsonContent = jsonContent.Right("edits")
            strippedJsonContent = Regex.Replace(strippedJsonContent, "\s", "")
            Dim editMatches = Regex.Matches(strippedJsonContent, """(?<start>\d+)-(?<end>\d+)"":(?<id>\d+),?")

            For Each match As Match In editMatches
                Edits.Add(New RpuEdit(match.Groups("id").Value.ToInt(), match.Groups("start").Value.ToInt(), match.Groups("end").Value.ToInt()))
            Next

            _lastWriteTimeL5 = File.GetLastWriteTimeUtc(Level5JsonFilePath)
        Catch ex As AbortException
            Throw ex
        Catch ex As Exception
            g.ShowException(ex)
            Throw New AbortException
        Finally
            Log.Save()
        End Try
    End Sub

    Public Sub WriteLevel5Export(Optional logContent As Boolean = True, Optional overwrite As Boolean = False)
        If Not Path?.FileExists() Then Return
        If Not overwrite AndAlso Level5JsonFilePath.FileExists() Then Return

        Try
            Dim pd = Path.Dir
            Dim l5 = Level5JsonFilePath.Replace(pd, "." & IO.Path.DirectorySeparatorChar)
            Dim arguments = $"export --data ""level5={l5}"" -i ""{Path}"""
            Using proc As New Proc
                proc.Package = Package.DoViTool
                proc.Project = p
                proc.Header = "Extract Level5 data from RPU metadata file"
                proc.Encoding = Encoding.UTF8
                proc.Arguments = arguments
                proc.WorkingDirectory = pd
                proc.AllowedExitCodes = {0}
                proc.OutputFiles = {Level5JsonFilePath}
                proc.Start()
            End Using
        Catch ex As AbortException
            Throw ex
        Catch ex As Exception
            g.ShowException(ex)
            Throw New AbortException
        Finally
            If logContent Then
                Dim exists = File.Exists(Level5JsonFilePath)
                Dim content = If(exists, File.ReadAllText(Level5JsonFilePath), "No file created!")
                
                Log.WriteHeader($"Content of {IO.Path.GetFileName(Level5JsonFilePath)}")
                Log.WriteLine(content)
            End If

            Log.Save()
        End Try
    End Sub

    Public Sub WriteEditorConfigFile(offset As Padding, Optional logContent As Boolean = True, Optional overwrite As Boolean = True)
        If Not Level5JsonFilePath?.FileExists() Then Return
        If Not overwrite AndAlso EditorConfigFilePath.FileExists() Then Return
        If offset = Padding.Empty Then Return
        If offset.Left < 0 OrElse offset.Top < 0 OrElse offset.Right < 0 OrElse offset.Bottom < 0 Then Throw New ArgumentOutOfRangeException(NameOf(offset))

        Try
            Dim p = ""
            For Each entry In Presets.OrderBy(Function(x) x.Id)
                Dim left = Math.Max(0, entry.Offset.Left - offset.Left)
                Dim top = Math.Max(0, entry.Offset.Top - offset.Top)
                Dim right = Math.Max(0, entry.Offset.Right - offset.Right)
                Dim bottom = Math.Max(0, entry.Offset.Bottom - offset.Bottom)

                p += $"{{"
                p += $"""id"":{entry.Id},"
                p += $"""left"":{left},"
                p += $"""right"":{right},"
                p += $"""top"":{top},"
                p += $"""bottom"":{bottom}"
                p += $"}},"
            Next
            p = p.TrimEnd(","c)
            p = $"""presets"":[{p}]"

            Dim e = ""
            For Each entry In Edits.OrderBy(Function(x) x.StartFrame)
                e += $"""{entry.StartFrame}-{entry.EndFrame}"":{entry.Id},"
            Next
            e = e.TrimEnd(","c)
            e = $"""edits"":{{{e}}}"

            Dim result = $"{{""active_area"":{{""crop"":false,{p},{e}}}}}"
            result.WriteFileUTF8(EditorConfigFilePath)
        Catch ex As AbortException
            Throw ex
        Catch ex As Exception
            g.ShowException(ex)
            Throw New AbortException
        Finally
            If logContent Then
                Dim exists = File.Exists(EditorConfigFilePath)
                Dim content = If(exists, File.ReadAllText(EditorConfigFilePath), "No file created!")
                
                Log.WriteHeader($"Content of {IO.Path.GetFileName(EditorConfigFilePath)}")
                Log.WriteLine(content)
            End If

            Log.Save()
        End Try
    End Sub

    Public Function WriteCroppedRpu(Optional overwrite As Boolean = True) As String
        If Not Path?.FileExists() Then Return Nothing
        If Not EditorConfigFilePath?.FileExists() Then Return Nothing
        If Not overwrite AndAlso CroppedRpuFilePath.FileExists() Then Return Nothing

        Try
            Dim arguments = $"editor -i ""{Path}"" -j ""{EditorConfigFilePath}"" -o ""{CroppedRpuFilePath}"""
            Using proc As New Proc
                proc.Package = Package.DoViTool
                proc.Project = p
                proc.Header = "Creating new RPU metadata file"
                proc.Encoding = Encoding.UTF8
                proc.Arguments = arguments
                proc.AllowedExitCodes = {0}
                proc.OutputFiles = {CroppedRpuFilePath}
                proc.Start()
            End Using
        Catch ex As AbortException
            Throw ex
        Catch ex As Exception
            g.ShowException(ex)
            Throw New AbortException
        Finally
            Log.Save()
        End Try

        Return CroppedRpuFilePath
    End Function
End Class