DSCResources/MSFT_TeamsVoiceRoutingPolicy/MSFT_TeamsVoiceRoutingPolicy.psm1

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

        [Parameter()]
        [System.String]
        $Description,

        [Parameter()]
        [System.String[]]
        $OnlinePstnUsages,

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

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

    Write-Verbose -Message "Getting the Voice Routing Policy {$Identity}"

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

    $ConnectionMode = New-M365DSCConnection -Platform 'SkypeForBusiness' `
        -InboundParameters $PSBoundParameters

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

    if ($null -eq $policy)
    {
        Write-Verbose -Message "Could not find Voice Routing Policy ${$Identity}"
        return @{
            Identity           = $Identity
            Ensure             = 'Absent'
            GlobalAdminAccount = $GlobalAdminAccount
        }
    }
    Write-Verbose -Message "Found Voice Routing Policy {$Identity}"
    return @{
        Identity                   = $Identity
        OnlinePstnUsages           = $policy.OnlinePstnUsages
        Description                = $policy.Description
        Ensure                     = 'Present'
        GlobalAdminAccount         = $GlobalAdminAccount
    }
}

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

        [Parameter()]
        [System.String]
        $Description,

        [Parameter()]
        [System.String[]]
        $OnlinePstnUsages,

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

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

    # Validate that the selected PSTN usages exist in the environment
    $existingUsages = Get-CsOnlinePstnUsage | Select-Object -ExpandProperty Usage
    $notFoundUsageList = @()
    foreach ($usage in $OnlinePstnUsages)
    {
        if ( -not ($existingUsages -match $usage))
        {
            $notFoundUsageList += $usage
        }
    }

    if ($notFoundUsageList)
    {
        $notFoundUsages = $notFoundUsageList -join ","
        throw "Please create the PSTN Usage(s) ($notFoundUsages) using `"TeamsPstnUsage`""
    }

    Write-Verbose -Message "Setting Voice Routing Policy {$Identity}"

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

    $ConnectionMode = New-M365DSCConnection -Platform 'SkypeForBusiness' `
        -InboundParameters $PSBoundParameters

    $CurrentValues = Get-TargetResource @PSBoundParameters

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

    if ($Ensure -eq 'Present' -and $CurrentValues.Ensure -eq 'Absent')
    {
        Write-Verbose -Message "Creating a new Voice Routing Policy {$Identity}"
        New-CsOnlineVoiceRoutingPolicy @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-CsOnlineVoiceRoutingPolicy cmdlet.
        #>

        Write-Verbose -Message "Updating settings for Voice Routing Policy {$Identity}"
        Set-CsOnlineVoiceRoutingPolicy @SetParameters
    }
    elseif ($Ensure -eq 'Absent' -and $CurrentValues.Ensure -eq 'Present')
    {
        Write-Verbose -Message "Removing existing Voice Routing Policy {$Identity}"
        Remove-CsOnlineVoiceRoutingPolicy -Identity $Identity -Confirm:$false
    }
}

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

        [Parameter()]
        [System.String]
        $Description,

        [Parameter()]
        [System.String[]]
        $OnlinePstnUsages,

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

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

    Write-Verbose -Message "Testing configuration of Voice Routing 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
    )
    #region Telemetry
    $ResourceName = $MyInvocation.MyCommand.ModuleName.Replace("MSFT_", "")
    $data = [System.Collections.Generic.Dictionary[[String], [String]]]::new()
    $data.Add("Resource", $ResourceName)
    $data.Add("Method", $MyInvocation.MyCommand)
    $data.Add("Principal", $GlobalAdminAccount.UserName)
    Add-M365DSCTelemetryEvent -Data $data
    #endregion

    $ConnectionMode = New-M365DSCConnection -Platform 'SkypeForBusiness' `
        -InboundParameters $PSBoundParameters

    $i = 1
    [array]$policies = Get-CsOnlineVoiceRoutingPolicy
    $content = ''
    Write-Host "`r`n" -NoNewLine
    foreach ($policy in $policies)
    {
        Write-Host " |---[$i/$($policies.Count)] $($policy.Identity)" -NoNewLine
        $params = @{
            Identity           = $policy.Identity
            Ensure             = 'Present'
            GlobalAdminAccount = $GlobalAdminAccount
        }
        $result = Get-TargetResource @params
        $result.GlobalAdminAccount = Resolve-Credentials -UserName "globaladmin"
        $content += " TeamsVoiceRoutingPolicy " + (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++
        Write-Host $Global:M365DSCEmojiGreenCheckMark
    }
    return $content
}

Export-ModuleMember -Function *-TargetResource