DSCResources/MSFT_TeamsCallingPolicy/MSFT_TeamsCallingPolicy.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

        [Parameter()]
        [System.Boolean]
        $AllowPrivateCalling,

        [Parameter()]
        [System.String]
        [ValidateSet('AlwaysEnabled', 'AlwaysDisabled', 'UserOverride')]
        $AllowVoicemail,

        [Parameter()]
        [System.Boolean]
        $AllowCallGroups,

        [Parameter()]
        [System.Boolean]
        $AllowDelegation,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToUser,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToPhone,

        [Parameter()]
        [System.Boolean]
        $PreventTollBypass,

        [Parameter()]
        [System.String]
        [ValidateSet('Enabled', 'Disabled')]
        $BusyOnBusyEnabledType = 'Enabled',

        [Parameter()]
        [ValidateSet("Present", "Absent")]
        [System.String]
        $Ensure = "Present",

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Getting the Teams Calling Policy $($Identity)"

    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent  -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SkypeForBusiness

    $policy = Get-CsTeamsCallingPolicy -Identity $Identity -ErrorAction 'SilentlyContinue'

    if ($null -eq $policy)
    {
        Write-Verbose -Message "Could not find Teams Calling Policy ${$Identity}"
        return @{
            Identity           = $Identity
            Ensure             = 'Absent'
            GlobalAdminAccount = $GlobalAdminAccount
        }
    }
    Write-Verbose -Message "Found Teams Calling Policy {$Identity}"
    return @{
        Identity                   = $Identity
        AllowPrivateCalling        = $policy.AllowPrivateCalling
        AllowVoicemail             = $policy.AllowVoicemail
        AllowCallGroups            = $policy.AllowCallGroups
        AllowDelegation            = $policy.AllowDelegation
        AllowCallForwardingToUser  = $policy.AllowCallForwardingToUser
        AllowCallForwardingToPhone = $policy.AllowCallForwardingToPhone
        PreventTollBypass          = $policy.PreventTollBypass
        BusyOnBusyEnabledType      = $policy.BusyOnBusyEnabledType
        Ensure                     = 'Present'
        GlobalAdminAccount         = $GlobalAdminAccount
    }
}

function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

        [Parameter()]
        [System.Boolean]
        $AllowPrivateCalling,

        [Parameter()]
        [System.String]
        [ValidateSet('AlwaysEnabled', 'AlwaysDisabled', 'UserOverride')]
        $AllowVoicemail,

        [Parameter()]
        [System.Boolean]
        $AllowCallGroups,

        [Parameter()]
        [System.Boolean]
        $AllowDelegation,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToUser,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToPhone,

        [Parameter()]
        [System.Boolean]
        $PreventTollBypass,

        [Parameter()]
        [System.String]
        [ValidateSet('Enabled', 'Disabled')]
        $BusyOnBusyEnabledType = 'Enabled',

        [Parameter()]
        [ValidateSet("Present", "Absent")]
        [System.String]
        $Ensure = "Present",

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Setting Teams Calling Policy"

    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SkypeForBusiness

    $CurrentValues = Get-TargetResource @PSBoundParameters

    $SetParameters = $PSBoundParameters
    $SetParameters.Remove("Ensure") | Out-Null
    $SetParameters.Remove("GlobalAdminAccount") | Out-Null

    if ($Ensure -eq 'Present' -and $CurrentValues.Ensure -eq 'Absent')
    {
        Write-Verbose -Message "Creating a new Teams Calling Policy {$Identity}"
        New-CsTeamsCallingPolicy @SetParameters
    }
    elseif ($Ensure -eq 'Present' -and $CurrentValues.Ensure -eq 'Present')
    {
        # If we get here, it's because the Test-TargetResource detected a drift, therefore we always call
        # into the Set-CsTeamsCallingPolicy cmdlet.
        Write-Verbose -Message "Updating settings for Teams Calling Policy {$Identity}"
        Set-CsTeamsCallingPolicy @SetParameters
    }
    elseif ($Ensure -eq 'Absent' -and $CurrentValues.Ensure -eq 'Present')
    {
        Write-Verbose -Message "Removing existing Teams Calling Policy {$Identity}"
        Remove-CsTeamsCallingPolicy -Identity $Identity -Confirm:$false
    }
}

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $Identity,

        [Parameter()]
        [System.Boolean]
        $AllowPrivateCalling,

        [Parameter()]
        [System.String]
        [ValidateSet('AlwaysEnabled', 'AlwaysDisabled', 'UserOverride')]
        $AllowVoicemail,

        [Parameter()]
        [System.Boolean]
        $AllowCallGroups,

        [Parameter()]
        [System.Boolean]
        $AllowDelegation,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToUser,

        [Parameter()]
        [System.Boolean]
        $AllowCallForwardingToPhone,

        [Parameter()]
        [System.Boolean]
        $PreventTollBypass,

        [Parameter()]
        [System.String]
        [ValidateSet('Enabled', 'Disabled')]
        $BusyOnBusyEnabledType = 'Enabled',

        [Parameter()]
        [ValidateSet("Present", "Absent")]
        [System.String]
        $Ensure = "Present",

        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )

    Write-Verbose -Message "Testing configuration of Team Calling Policy {$Identity}"

    $CurrentValues = Get-TargetResource @PSBoundParameters

    Write-Verbose -Message "Current Values: $(Convert-M365DscHashtableToString -Hashtable $CurrentValues)"
    Write-Verbose -Message "Target Values: $(Convert-M365DscHashtableToString -Hashtable $PSBoundParameters)"

    $ValuesToCheck = $PSBoundParameters
    $ValuesToCheck.Remove('GlobalAdminAccount') | Out-Null

    $TestResult = Test-Microsoft365DSCParameterState -CurrentValues $CurrentValues `
        -Source $($MyInvocation.MyCommand.Source) `
        -DesiredValues $PSBoundParameters `
        -ValuesToCheck $ValuesToCheck.Keys

    Write-Verbose -Message "Test-TargetResource returned $TestResult"

    return $TestResult
}

function Export-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.String])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $GlobalAdminAccount
    )
    $InformationPreference = 'Continue'

    #region Telemetry
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $MyInvocation.MyCommand.ModuleName)
    $data.Add("Method", $MyInvocation.MyCommand)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform SkypeForBusiness

    $i = 1
    [array]$policies = Get-CsTeamsCallingPolicy
    $content = ''
    foreach ($policy in $policies)
    {
        Write-Information " [$i/$($policies.Count)] $($policy.Identity)"
        $params = @{
            Identity           = $policy.Identity
            Ensure             = 'Present'
            GlobalAdminAccount = $GlobalAdminAccount
        }
        $result = Get-TargetResource @params
        $result.GlobalAdminAccount = Resolve-Credentials -UserName "globaladmin"
        $content += " TeamsCallingPolicy " + (New-GUID).ToString() + "`r`n"
        $content += " {`r`n"
        $currentDSCBlock = Get-DSCBlock -Params $result -ModulePath $PSScriptRoot
        $content += Convert-DSCStringParamToVariable -DSCBlock $currentDSCBlock -ParameterName "GlobalAdminAccount"
        $content += " }`r`n"
        $i++
    }
    return $content
}

Export-ModuleMember -Function *-TargetResource