Public Class Terminal
    Public command As String
    Public DefaultPrompt As String
    Public TrackPos As Integer
    Public AdvancedCommand As Boolean
    Public BadCommand As Boolean

    Private Sub Terminal_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        FormBorderStyle = FormBorderStyle.None
        WindowState = FormWindowState.Maximized
        If Strings.IsFree = True Then
            Strings.ComputerInfo(0) = "shiftos"
            Strings.ComputerInfo(1) = "user"
            Strings.ComputerInfo(2) = 0
            PrintPrompt()
            AssignPrompt()
        Else

        End If
        TextBox1.Select(TextBox1.TextLength, 0)
        TextBox1.ScrollToCaret()
    End Sub

    Public Sub PrintPrompt()
        If TextBox1.Text = Nothing Then
            If Strings.OnceInfo(0) = "Yes" Then
                TextBox1.Text = "root@" & Strings.ComputerInfo(0) & " #> "
            Else
                TextBox1.Text = Strings.ComputerInfo(1) & "@" & Strings.ComputerInfo(0) & " $> "
            End If
        Else
            If Strings.OnceInfo(0) = "Yes" Then
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "root@" & Strings.ComputerInfo(0) & " #> "
            Else
                TextBox1.Text = TextBox1.Text & Environment.NewLine & Strings.ComputerInfo(1) & "@" & Strings.ComputerInfo(0) & " $> "
            End If
        End If
    End Sub

    Public Sub AssignPrompt()
        If Strings.OnceInfo(0) = "Yes" Then
            DefaultPrompt = "root@" & Strings.ComputerInfo(0) & " #> "
        Else
            DefaultPrompt = Strings.ComputerInfo(1) & "@" & Strings.ComputerInfo(0) & " $> "
        End If
    End Sub

    Private Sub Undeveloped()
        TextBox1.Text = TextBox1.Text & Environment.NewLine & "Oopsie! It's only for newer version"
    End Sub

    Private Sub ReadCommand()
        command = TextBox1.Lines(TextBox1.Lines.Length - 1)
        command = command.Replace(DefaultPrompt, "")
        command = command.ToLower()
    End Sub

    Private Sub DoCommand()
        AdvancedCommand = True
        BadCommand = True
        Select Case command
            Case ""
                AdvancedCommand = False
                BadCommand = False
            Case "clear"
                If Strings.AvailableFeature(1) = "1" Then
                    TextBox1.Text = Nothing
                    AdvancedCommand = False
                    BadCommand = False
                End If
            Case "codepoint"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & Strings.ComputerInfo(2) & " Codepoint(s) available in your wallet"
                AdvancedCommand = False
                BadCommand = False
            Case "guess"
                'AppHost("gtn")
                Undeveloped()
            Case "gimme"
                Dim TempCP As Integer = Convert.ToInt32(Strings.ComputerInfo(2))
                TempCP = TempCP + 50
                Strings.ComputerInfo(2) = Convert.ToString(TempCP)
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "you cheater!"
            Case "help"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "ShiftOS Help Manual" & Environment.NewLine & Environment.NewLine & "You can type 'help' to get all available commands and its corresponding action."
                If Strings.AvailableFeature(0) = 1 Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "To get help on each command, you can type 'man [command]'" & Environment.NewLine
                Else
                    TextBox1.Text = TextBox1.Text & Environment.NewLine
                End If
                If Strings.AvailableFeature(1) = 1 Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "CLEAR       Clear the terminal"
                End If
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "CODEPOINT   Display Codepoint(s) from your wallet"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "HELP        Shows all commands available and its corresponding action"
                If Strings.AvailableFeature(0) = 1 Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "MAN         Shows a command, its corresponding action, and its example usage"
                End If
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "SHIFTORIUM  Terminate ShiftOS session"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "SHUTDOWN    Terminate ShiftOS session"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "SU          Runs terminal as super user"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "VER         Printing current version of ShiftOS TheRevival"
                TextBox1.Text = TextBox1.Text & Environment.NewLine
                AdvancedCommand = False
                BadCommand = False
            Case "su"
                If Strings.OnceInfo(0) = "Yes" Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "You already in root mode!"
                Else
                    Strings.OnceInfo(0) = "Yes"
                    AssignPrompt()
                End If
                AdvancedCommand = False
                BadCommand = False
            Case "shutdown", "shut down"
                ShiftOSMenu.Show()
                Close()
            Case "ver"
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "ShiftOS TheRevival version 0.1.1"
                AdvancedCommand = False
                BadCommand = False
        End Select

        If AdvancedCommand = True Then
            If command Like "man *" Then
                If Strings.AvailableFeature(0) = "1" Then
                    'MAN command starts with this kinda format
                    'ShiftOS Help Manual
                    '
                    ''command' Usage: [switch/value if needed]
                    '
                    'Summary of the command's action
                    '
                    'Example usage : command
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "ShiftOS Help Manual" & Environment.NewLine
                    'TextBox1.Text = TextBox1.Text & Environment.NewLine & command.Substring(4)
                    Dim mancommand As String = command.Replace("man ", "")
                    Dim TempUsage As String = "'" & mancommand & "' Usage: "
                    Select Case mancommand
                        Case "clear"
                            TempUsage = TempUsage & "clear"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Clears all contents of the terminal" & Environment.NewLine
                            BadCommand = False
                        Case "codepoint"
                            TempUsage = TempUsage & "codepoint"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Shows the value of codepoint in your wallet" & Environment.NewLine
                            BadCommand = False
                        Case "help"
                            TempUsage = TempUsage & "help"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Shows all commands available in the terminal and its brief explanation of action" & Environment.NewLine
                            BadCommand = False
                        Case "man"
                            TempUsage = TempUsage & "man [command]"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Shows up a manual on each corresponding command and its example of action" & Environment.NewLine & Environment.NewLine & "[COMMAND] Any command that you want to get the manual for" & Environment.NewLine & Environment.NewLine & "Example: man help"
                            BadCommand = False
                        Case "shutdown"
                            TempUsage = TempUsage & "shutdown"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Terminate ShiftOS session" & Environment.NewLine
                            BadCommand = False
                        Case "ver"
                            TempUsage = TempUsage & "ver"
                            TextBox1.Text = TextBox1.Text & TempUsage & Environment.NewLine & Environment.NewLine & "Displays current version of ShiftOS TheRevival" & Environment.NewLine
                            BadCommand = False
                        Case Else
                            TextBox1.Text = TextBox1.Text & Environment.NewLine & "MAN : Invalid command"
                    End Select
                End If
            End If
            If command Like "shiftorium *" Then
                Dim prompt As String = command.Replace("shiftorium ", "")
                TextBox1.Text = TextBox1.Text & Environment.NewLine & "Shiftorium ShiftOS Center"
                If prompt Like "info *" Then
                    prompt = command.Replace("shiftorium info ", "")
                    'ManHeader is for the ShiftOS Help Manual header and the 'Cost' footer, kinda like template-ish
                    Dim ManHeader(1) As String
                    'ManHeader(0) = Insert any feature here for the Case prompt
                    ManHeader(1) = "Cost: "
                    Select Case prompt
                        Case "man"
                            ManHeader(0) = "ShiftOS Help Manual (command: man)"
                            ManHeader(1) = "20 CP"
                            TextBox1.Text = TextBox1.Text & Environment.NewLine & ManHeader(0) & Environment.NewLine & Environment.NewLine & "Shows up any further help instruction on each command, its corresponding action and its example if necessary" & Environment.NewLine & Environment.NewLine & ManHeader(1)
                            BadCommand = False
                        Case "clear"
                            ManHeader(0) = "Clear Terminal Screen (command: clear)"
                            ManHeader(1) = "25 CP"
                            TextBox1.Text = TextBox1.Text & Environment.NewLine & ManHeader(0) & Environment.NewLine & Environment.NewLine & "Clears the terminal screen" & Environment.NewLine & Environment.NewLine & ManHeader(1)
                            BadCommand = False
                        Case Else
                            BadCommand = False
                            TextBox1.Text = TextBox1.Text & Environment.NewLine & "Shiftorium: Bad command or not available"
                    End Select
                End If
                If prompt Like "install *" Then
                    prompt = command.Replace("shiftorium install ", "")
                    Select Case prompt
                        Case "man"
                            InstallFeature(True, "man", 20)
                            BadCommand = False
                        Case "clear"
                            InstallFeature(True, "clear", 25)
                            BadCommand = False
                        Case Else
                            BadCommand = False
                            TextBox1.Text = TextBox1.Text & Environment.NewLine & "Shiftorium: Bad command or not available"
                    End Select
                End If
                If prompt = "list" Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & "Shiftorium Available Feature(s)" & Environment.NewLine
                    If Strings.AvailableFeature(0) = "0" Then
                        TextBox1.Text = TextBox1.Text & Environment.NewLine & "ShiftOS Help Manual (20 CP)"
                    End If
                    If Strings.AvailableFeature(1) = "0" Then
                        TextBox1.Text = TextBox1.Text & Environment.NewLine & "Clear Terminal Screen (25 CP)"
                    End If
                    BadCommand = False
                End If
            End If
                If command Like "print *" Then
                    TextBox1.Text = TextBox1.Text & Environment.NewLine & command.Substring(6)
                    Dim printed As String = command.Replace("print ", "")
                    ''It has the same issue, only displays in lowercase
                    'TextBox1.Text = TextBox1.Text & Environment.NewLine & printed
                    BadCommand = False
                End If
                AdvancedCommand = False
            End If

            If BadCommand = True Then
            TextBox1.Text = TextBox1.Text & Environment.NewLine & "Bad command or wrong file name"
        End If
    End Sub

    Private Sub txtterm_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
        If e.KeyCode = Keys.T AndAlso e.Control Then
            Me.Hide()
            e.SuppressKeyPress = True
        End If

        Select Case e.KeyCode
            Case Keys.ShiftKey
                TrackPos = TrackPos - 1
            Case Keys.Alt
                TrackPos = TrackPos - 1
            Case Keys.CapsLock
                TrackPos = TrackPos - 1
            Case Keys.ControlKey
                TrackPos = TrackPos - 1
            Case Keys.LWin
                TrackPos = TrackPos - 1
            Case Keys.RWin
                TrackPos = TrackPos - 1
            Case Keys.Right
                If TextBox1.SelectionStart = TextBox1.TextLength Then
                    TrackPos = TrackPos - 1
                End If
            Case Keys.Left
                If TrackPos < 1 Then
                    e.SuppressKeyPress = True
                    TrackPos = TrackPos - 1
                Else
                    TrackPos = TrackPos - 2
                End If
            Case Keys.Up
                e.SuppressKeyPress = True
                TrackPos = TrackPos - 1
            Case Keys.Down
                e.SuppressKeyPress = True
                TrackPos = TrackPos - 1
        End Select

        If e.KeyCode = Keys.Enter Then
            e.SuppressKeyPress = True
            ReadCommand()
            DoCommand()

            If command = "clear" Then
                PrintPrompt()
                TextBox1.Select(TextBox1.Text.Length, 0)

            Else
                PrintPrompt()
                TextBox1.Select(TextBox1.Text.Length, 0)
            End If

            TrackPos = 0
        Else
            If e.KeyCode = Keys.Back Then
            Else
                TrackPos = TrackPos + 1
            End If
        End If

        If e.KeyCode = Keys.Back Then
            If TrackPos < 1 Then
                e.SuppressKeyPress = True
            Else
                If TextBox1.SelectedText.Length < 1 Then
                    TrackPos = TrackPos - 1
                Else
                    e.SuppressKeyPress = True
                End If
            End If
        End If

        TextBox1.Select(TextBox1.TextLength, 0)
        TextBox1.ScrollToCaret()
    End Sub

    Private Sub TextBox1_Click(sender As Object, e As EventArgs) Handles TextBox1.Click, TextBox1.MouseDoubleClick
        TextBox1.Select(TextBox1.TextLength, 0)
        TextBox1.ScrollToCaret()
    End Sub
End Class