Imports System.Threading
Imports System.Net
Public Class main
    Dim weblistener As HttpListener
    Dim lastpos As New Point(0, 0)
    Dim startpos As New Point(0, 0)
    Dim leftclicking As Boolean = False

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles StartButton.Click
        If Not weblistener Is Nothing Then
            weblistener.Abort()
            weblistener = Nothing
            log("Stopped")
            StartButton.BackColor = Color.Lime
            StartButton.Text = "Start"
        Else
            weblistener = New HttpListener
            weblistener.Prefixes.Add("http://*:8080/")
            weblistener.Start()
            Dim listenthread As New Thread(AddressOf listenforconnection)
            listenthread.Start()
            log("Started")
            StartButton.BackColor = Color.Red
            StartButton.Text = "Stop"
        End If

    End Sub

    Public Sub listenforconnection()
        Dim context As HttpListenerContext = Nothing
        Dim resp As HttpListenerResponse
        Dim respstr As String = String.Empty
        Dim lastpacket As Long = -1
        Dim lastpack As Long
        Dim leftclicking As Boolean = False
        While weblistener.IsListening
            Try
                context = weblistener.GetContext()
            Catch ex As Exception
                If weblistener Is Nothing OrElse weblistener.IsListening = False Then
                    Exit Sub
                End If
            End Try
            resp = context.Response
            Dim path As String = context.Request.Url.AbsolutePath
            log(context.Request.RemoteEndPoint.ToString & " " & context.Request.RawUrl)
            ' check for valid command packets

            If path = "/" Then
                respstr = FileIO.FileSystem.ReadAllText("page.html")
                lastpacket = 0
            Else
                Dim pack As Long = context.Request.QueryString("seq")
                If pack > lastpack Then
                    respstr = handleinput(context.Request)
                    lastpack = pack
                End If
            End If

            If String.IsNullOrEmpty(respstr) Then
                respstr = "bad"
            End If
            Dim respbytes As Byte() = System.Text.Encoding.UTF8.GetBytes(respstr)
            resp.ContentLength64 = respbytes.Length
            resp.OutputStream.Write(respbytes, 0, respbytes.Length)
            resp.OutputStream.Close()
            resp.Close()
            'perftimer.Reset()
        End While
    End Sub

    Private Sub Form1_FormClosing(sender As System.Object, e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
        If Not weblistener Is Nothing Then
            weblistener.Abort()
        End If
    End Sub

    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Control.CheckForIllegalCrossThreadCalls = False
        Button1_Click(sender, e)
    End Sub
    Private Sub log(str As String)
        Dim oldtext As String = LogText.Text
        Dim oldsplit() As String = oldtext.Split(vbNewLine)
        Dim newtext As String
        newtext = Now.ToString("[HH:mm:ss.fff] ") & str & vbNewLine
        For i = 0 To Math.Min(oldsplit.Length - 1, 5)
            newtext &= oldsplit(i) & vbNewLine
        Next

        LogText.Text = newtext
    End Sub

    Private Function handleinput(req As HttpListenerRequest) As String
        Dim split() As String = req.Url.AbsolutePath.Split({"/"}, StringSplitOptions.RemoveEmptyEntries)
        If split.Length < 1 Then
            Return "bad"
        End If
        Dim opt As String = split(0)

        Select Case opt

            Case "start"  'start of trackpad touch
                lastpos.X = req.QueryString("x")
                lastpos.Y = req.QueryString("y")
                startpos.X = req.QueryString("x")
                startpos.Y = req.QueryString("y")

            Case "move"   'trackpad touch move
                mouse_event(MouseEventFlags.MOUSEEVENTF_MOVE, req.QueryString("x") - lastpos.X, req.QueryString("y") - lastpos.Y, 0, 0)
                lastpos.X = req.QueryString("x")
                lastpos.Y = req.QueryString("y")

            Case "end"
                Dim tol As Integer = TapInput.Value
                If (Math.Abs(req.QueryString("x") - startpos.X) < tol) And (Math.Abs(req.QueryString("y") - startpos.Y) < tol) Then
                    mouse_event(MouseEventFlags.MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0)
                    System.Threading.Thread.Sleep(10)
                    mouse_event(MouseEventFlags.MOUSEEVENTF_LEFTUP, 0, 0, 0, 0)
                End If

            Case "left"
                If leftclicking Then
                    mouse_event(MouseEventFlags.MOUSEEVENTF_LEFTUP, 0, 0, 0, 0)
                    leftclicking = False
                Else
                    mouse_event(MouseEventFlags.MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0)
                    leftclicking = True
                End If

            Case "middle"
                mouse_event(MouseEventFlags.MOUSEEVENTF_MIDDLEDOWN, 0, 0, 0, 0)
                System.Threading.Thread.Sleep(10)
                mouse_event(MouseEventFlags.MOUSEEVENTF_MIDDLEUP, 0, 0, 0, 0)

            Case "right"
                mouse_event(MouseEventFlags.MOUSEEVENTF_RIGHTDOWN, 0, 0, 0, 0)
                System.Threading.Thread.Sleep(10)
                mouse_event(MouseEventFlags.MOUSEEVENTF_RIGHTUP, 0, 0, 0, 0)

            Case "wheel"
                mouse_event(MouseEventFlags.MOUSEEVENTF_WHEEL, 0, 0, WHEEL_DELTA * req.QueryString("d"), 0)

            Case "volume"
                If req.QueryString("d") = -1 Then
                    keybd_press(VK.VOLUME_DOWN)
                ElseIf req.QueryString("d") = 0 Then
                    keybd_press(VK.VOLUME_MUTE)
                ElseIf req.QueryString("d") = 1 Then
                    keybd_press(VK.VOLUME_UP)
                End If

            Case "media"
                Select Case req.QueryString("act")
                    Case "stop"
                        keybd_press(VK.MEDIA_STOP)
                    Case "prev"
                        keybd_press(VK.MEDIA_PREV_TRACK)
                    Case "play"
                        keybd_press(VK.MEDIA_PLAY_PAUSE)
                    Case "next"
                        keybd_press(VK.MEDIA_NEXT_TRACK)
                End Select

            Case "text"

            Case Else
                Return "bad"

        End Select
        Return "ok"
    End Function


End Class