Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TxtStreamed As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents TxtDownloaded As System.Windows.Forms.TextBox
    Friend WithEvents Label5 As System.Windows.Forms.Label
    Friend WithEvents BtnPremium As System.Windows.Forms.Button
    Friend WithEvents BtnRegular As System.Windows.Forms.Button
    Friend WithEvents BtnBasic As System.Windows.Forms.Button
    Friend WithEvents BtnAll As System.Windows.Forms.Button
    Friend WithEvents BtnClear As System.Windows.Forms.Button
    Friend WithEvents BtnQuit As System.Windows.Forms.Button
    Friend WithEvents GroupBox2 As System.Windows.Forms.GroupBox
    Friend WithEvents Label6 As System.Windows.Forms.Label
    Friend WithEvents TxtPremium As System.Windows.Forms.TextBox
    Friend WithEvents TxtRegular As System.Windows.Forms.TextBox
    Friend WithEvents Label7 As System.Windows.Forms.Label
    Friend WithEvents TxtBasic As System.Windows.Forms.TextBox
    Friend WithEvents Label8 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.TxtStreamed = New System.Windows.Forms.TextBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.TxtDownloaded = New System.Windows.Forms.TextBox
        Me.Label5 = New System.Windows.Forms.Label
        Me.BtnPremium = New System.Windows.Forms.Button
        Me.BtnRegular = New System.Windows.Forms.Button
        Me.BtnBasic = New System.Windows.Forms.Button
        Me.BtnAll = New System.Windows.Forms.Button
        Me.BtnClear = New System.Windows.Forms.Button
        Me.BtnQuit = New System.Windows.Forms.Button
        Me.GroupBox2 = New System.Windows.Forms.GroupBox
        Me.Label6 = New System.Windows.Forms.Label
        Me.TxtPremium = New System.Windows.Forms.TextBox
        Me.TxtRegular = New System.Windows.Forms.TextBox
        Me.Label7 = New System.Windows.Forms.Label
        Me.TxtBasic = New System.Windows.Forms.TextBox
        Me.Label8 = New System.Windows.Forms.Label
        Me.GroupBox1.SuspendLayout()
        Me.GroupBox2.SuspendLayout()
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 18.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(344, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(131, 37)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "E-Tunes"
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.Label4)
        Me.GroupBox1.Controls.Add(Me.TxtDownloaded)
        Me.GroupBox1.Controls.Add(Me.Label5)
        Me.GroupBox1.Controls.Add(Me.Label3)
        Me.GroupBox1.Controls.Add(Me.TxtStreamed)
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Location = New System.Drawing.Point(40, 104)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(304, 160)
        Me.GroupBox1.TabIndex = 1
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "Customer Monthly Activity"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(16, 48)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(120, 32)
        Me.Label2.TabIndex = 0
        Me.Label2.Text = "Listened To:"
        '
        'TxtStreamed
        '
        Me.TxtStreamed.Location = New System.Drawing.Point(128, 48)
        Me.TxtStreamed.Name = "TxtStreamed"
        Me.TxtStreamed.Size = New System.Drawing.Size(72, 22)
        Me.TxtStreamed.TabIndex = 1
        Me.TxtStreamed.Text = ""
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.Location = New System.Drawing.Point(208, 48)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(64, 24)
        Me.Label3.TabIndex = 2
        Me.Label3.Text = "Songs"
        '
        'Label4
        '
        Me.Label4.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.Location = New System.Drawing.Point(208, 96)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(64, 24)
        Me.Label4.TabIndex = 5
        Me.Label4.Text = "Songs"
        '
        'TxtDownloaded
        '
        Me.TxtDownloaded.Location = New System.Drawing.Point(128, 96)
        Me.TxtDownloaded.Name = "TxtDownloaded"
        Me.TxtDownloaded.Size = New System.Drawing.Size(72, 22)
        Me.TxtDownloaded.TabIndex = 4
        Me.TxtDownloaded.Text = ""
        '
        'Label5
        '
        Me.Label5.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label5.Location = New System.Drawing.Point(16, 96)
        Me.Label5.Name = "Label5"
        Me.Label5.Size = New System.Drawing.Size(120, 32)
        Me.Label5.TabIndex = 3
        Me.Label5.Text = "Saved:"
        '
        'BtnPremium
        '
        Me.BtnPremium.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnPremium.Location = New System.Drawing.Point(40, 312)
        Me.BtnPremium.Name = "BtnPremium"
        Me.BtnPremium.Size = New System.Drawing.Size(112, 32)
        Me.BtnPremium.TabIndex = 2
        Me.BtnPremium.Text = "Premium"
        '
        'BtnRegular
        '
        Me.BtnRegular.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnRegular.Location = New System.Drawing.Point(168, 312)
        Me.BtnRegular.Name = "BtnRegular"
        Me.BtnRegular.Size = New System.Drawing.Size(112, 32)
        Me.BtnRegular.TabIndex = 3
        Me.BtnRegular.Text = "Regular"
        '
        'BtnBasic
        '
        Me.BtnBasic.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnBasic.Location = New System.Drawing.Point(296, 312)
        Me.BtnBasic.Name = "BtnBasic"
        Me.BtnBasic.Size = New System.Drawing.Size(112, 32)
        Me.BtnBasic.TabIndex = 4
        Me.BtnBasic.Text = "Basic"
        '
        'BtnAll
        '
        Me.BtnAll.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnAll.Location = New System.Drawing.Point(424, 312)
        Me.BtnAll.Name = "BtnAll"
        Me.BtnAll.Size = New System.Drawing.Size(112, 32)
        Me.BtnAll.TabIndex = 5
        Me.BtnAll.Text = "Show All"
        '
        'BtnClear
        '
        Me.BtnClear.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnClear.Location = New System.Drawing.Point(552, 312)
        Me.BtnClear.Name = "BtnClear"
        Me.BtnClear.Size = New System.Drawing.Size(112, 32)
        Me.BtnClear.TabIndex = 6
        Me.BtnClear.Text = "Reset"
        '
        'BtnQuit
        '
        Me.BtnQuit.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.BtnQuit.Location = New System.Drawing.Point(680, 312)
        Me.BtnQuit.Name = "BtnQuit"
        Me.BtnQuit.Size = New System.Drawing.Size(112, 32)
        Me.BtnQuit.TabIndex = 7
        Me.BtnQuit.Text = "Quit"
        '
        'GroupBox2
        '
        Me.GroupBox2.Controls.Add(Me.TxtBasic)
        Me.GroupBox2.Controls.Add(Me.Label8)
        Me.GroupBox2.Controls.Add(Me.TxtRegular)
        Me.GroupBox2.Controls.Add(Me.Label7)
        Me.GroupBox2.Controls.Add(Me.TxtPremium)
        Me.GroupBox2.Controls.Add(Me.Label6)
        Me.GroupBox2.Location = New System.Drawing.Point(400, 104)
        Me.GroupBox2.Name = "GroupBox2"
        Me.GroupBox2.Size = New System.Drawing.Size(392, 160)
        Me.GroupBox2.TabIndex = 8
        Me.GroupBox2.TabStop = False
        Me.GroupBox2.Text = "Monthly Cost"
        '
        'Label6
        '
        Me.Label6.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label6.Location = New System.Drawing.Point(48, 32)
        Me.Label6.Name = "Label6"
        Me.Label6.Size = New System.Drawing.Size(120, 32)
        Me.Label6.TabIndex = 0
        Me.Label6.Text = "Premium "
        '
        'TxtPremium
        '
        Me.TxtPremium.Location = New System.Drawing.Point(168, 32)
        Me.TxtPremium.Name = "TxtPremium"
        Me.TxtPremium.ReadOnly = True
        Me.TxtPremium.Size = New System.Drawing.Size(96, 22)
        Me.TxtPremium.TabIndex = 1
        Me.TxtPremium.Text = ""
        '
        'TxtRegular
        '
        Me.TxtRegular.Location = New System.Drawing.Point(168, 72)
        Me.TxtRegular.Name = "TxtRegular"
        Me.TxtRegular.ReadOnly = True
        Me.TxtRegular.Size = New System.Drawing.Size(96, 22)
        Me.TxtRegular.TabIndex = 3
        Me.TxtRegular.Text = ""
        '
        'Label7
        '
        Me.Label7.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label7.Location = New System.Drawing.Point(48, 72)
        Me.Label7.Name = "Label7"
        Me.Label7.Size = New System.Drawing.Size(120, 32)
        Me.Label7.TabIndex = 2
        Me.Label7.Text = "Regular"
        '
        'TxtBasic
        '
        Me.TxtBasic.Location = New System.Drawing.Point(168, 112)
        Me.TxtBasic.Name = "TxtBasic"
        Me.TxtBasic.ReadOnly = True
        Me.TxtBasic.Size = New System.Drawing.Size(96, 22)
        Me.TxtBasic.TabIndex = 5
        Me.TxtBasic.Text = ""
        '
        'Label8
        '
        Me.Label8.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label8.Location = New System.Drawing.Point(48, 112)
        Me.Label8.Name = "Label8"
        Me.Label8.Size = New System.Drawing.Size(120, 32)
        Me.Label8.TabIndex = 4
        Me.Label8.Text = "Basic"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(872, 400)
        Me.Controls.Add(Me.GroupBox2)
        Me.Controls.Add(Me.BtnQuit)
        Me.Controls.Add(Me.BtnClear)
        Me.Controls.Add(Me.BtnAll)
        Me.Controls.Add(Me.BtnBasic)
        Me.Controls.Add(Me.BtnRegular)
        Me.Controls.Add(Me.BtnPremium)
        Me.Controls.Add(Me.GroupBox1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "E-Tunes"
        Me.GroupBox1.ResumeLayout(False)
        Me.GroupBox2.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Const maxStreamed As Integer = 15000
    Const maxDownloaded As Integer = 1000

    Private Function GetInput(ByRef numStreamed As Integer, ByRef numDown As Integer) As Boolean
        Dim ok As Boolean = True
        If IsNumeric(TxtStreamed.Text) Then
            numStreamed = Convert.ToInt32(TxtStreamed.Text)
            If (numStreamed >= 0) And (numStreamed <= maxStreamed) Then
                ' valid - don't need to do anything
            Else
                MsgBox("Number of songs listened to must be between 0 and " & maxStreamed)
                ok = False
            End If
        Else
            MsgBox("Number of songs listened to must be numeric")
            ok = False
        End If
        If IsNumeric(TxtDownloaded.Text) Then
            numDown = Convert.ToInt32(TxtDownloaded.Text)
            If (numDown >= 0) And (numDown <= maxDownloaded) Then
                ' valid - don't need to do anything
            Else
                MsgBox("Number of songs saved to disk must be between 0 and " & maxDownloaded)
                ok = False
            End If
        Else
            MsgBox("Number of songs saved to disk must be numeric")
            ok = False
        End If
        Return ok

    End Function

    Private Function costFunct(ByVal actual As Integer, ByVal free As Integer, ByVal extraCost As Double) As Double

        Dim extra As Integer
        Dim cost As Double
        If actual <= free Then
            Return 0.0
        Else
            extra = actual - free
            cost = extra * extraCost
            Return cost
        End If
    End Function

    Private Function premiumCost(ByVal streamed As Integer, ByVal downloaded As Integer) As Double
        Dim streamCost As Double
        Dim downloadCost As Double
        Dim totalCost As Double
        Const premFreeStream As Integer = 1000
        Const premFreeDown As Integer = 100
        Const premMonthly As Double = 50.0
        Const premMargStream As Double = 0.05
        Const premMargDown As Double = 0.5
        streamCost = costFunct(streamed, premFreeStream, premMargStream)
        downloadCost = costFunct(downloaded, premFreeDown, premMargDown)
        totalCost = premMonthly + streamCost + downloadCost
        Return totalCost

    End Function


    Private Function regularCost(ByVal streamed As Integer, ByVal downloaded As Integer) As Double
        Dim streamCost As Double
        Dim downloadCost As Double
        Dim totalCost As Double
        Const regFreeStream As Integer = 200
        Const regFreeDown As Integer = 10
        Const regMonthly As Double = 20.0
        Const regMargStream As Double = 0.1
        Const regMargDown As Double = 1.0
        streamCost = costFunct(streamed, regFreeStream, regMargStream)
        downloadCost = costFunct(downloaded, regFreeDown, regMargDown)
        totalCost = regMonthly + streamCost + downloadCost
        Return totalCost


    End Function


    Private Function basicCost(ByVal streamed As Integer, ByVal downloaded As Integer) As Double
        Dim streamCost As Double
        Dim downloadCost As Double
        Dim totalCost As Double
        Const basicFreeStream As Integer = 100
        Const basicFreeDown As Integer = 5
        Const basicMonthly As Double = 10.0
        Const basicMargStream As Double = 0.2
        Const basicMargDown As Double = 2.0
        streamCost = costFunct(streamed, basicFreeStream, basicMargStream)
        downloadCost = costFunct(downloaded, basicFreeDown, basicMargDown)
        totalCost = basicMonthly + streamCost + downloadCost
        Return totalCost


    End Function

    Private Sub BtnQuit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnQuit.Click
        Me.Close()

    End Sub

    Private Sub BtnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnClear.Click
        TxtStreamed.Text = ""
        TxtDownloaded.Text = ""
        TxtPremium.Text = ""
        TxtRegular.Text = ""
        TxtBasic.Text = ""
    End Sub

    Private Sub BtnPremium_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnPremium.Click
        Dim ok As Boolean
        Dim streamed As Integer
        Dim downloaded As Integer
        Dim cost As Double

        ok = GetInput(streamed, downloaded)
        If ok Then
            cost = premiumCost(streamed, downloaded)
            TxtPremium.Text = cost.ToString("c")

        End If
    End Sub

    Private Sub BtnRegular_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnRegular.Click
        Dim ok As Boolean
        Dim streamed As Integer
        Dim downloaded As Integer
        Dim cost As Double

        ok = GetInput(streamed, downloaded)
        If ok Then
            cost = regularCost(streamed, downloaded)
            TxtRegular.Text = cost.ToString("c")

        End If
    End Sub

    Private Sub BtnBasic_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnBasic.Click
        Dim ok As Boolean
        Dim streamed As Integer
        Dim downloaded As Integer
        Dim cost As Double

        ok = GetInput(streamed, downloaded)
        If ok Then
            cost = basicCost(streamed, downloaded)
            TxtBasic.Text = cost.ToString("c")

        End If
    End Sub

    Private Sub BtnAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnAll.Click
        Dim ok As Boolean
        Dim streamed As Integer
        Dim downloaded As Integer
        Dim cost As Double

        ok = GetInput(streamed, downloaded)
        If ok Then
            cost = premiumCost(streamed, downloaded)
            TxtPremium.Text = cost.ToString("c")
            cost = regularCost(streamed, downloaded)
            TxtRegular.Text = cost.ToString("c")
            cost = basicCost(streamed, downloaded)
            TxtBasic.Text = cost.ToString("c")

        End If
    End Sub
End Class