DSCResources/MSFT_SPServiceAppPool/MSFT_SPServiceAppPool.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Name,
        [parameter(Mandatory = $true)]  [System.String] $ServiceAccount,
        [parameter(Mandatory = $false)] [ValidateSet("Present","Absent")] [System.String] $Ensure = "Present",
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    Write-Verbose -Message "Getting service application pool '$Name'"

    $result = Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
        $params = $args[0]

        $sap = Get-SPServiceApplicationPool -Identity $params.Name -ErrorAction SilentlyContinue
        if ($null -eq $sap) { return @{
            Name = $params.Name
            ServiceAccount = $params.ProcessAccountName
            InstallAccount = $params.InstallAccount
            Ensure = "Absent"
        } }
        
        return @{
            Name = $sap.Name
            ServiceAccount = $sap.ProcessAccountName
            InstallAccount = $params.InstallAccount
            Ensure = "Present"
        }
    }
    return $result
}


function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Name,
        [parameter(Mandatory = $true)]  [System.String] $ServiceAccount,
        [parameter(Mandatory = $false)] [ValidateSet("Present","Absent")] [System.String] $Ensure = "Present",
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    $CurrentValues = Get-TargetResource @PSBoundParameters
    
    Write-Verbose -Message "Creating service application pool '$Name'"

    if ($CurrentValues.Ensure -eq "Absent" -and $Ensure -eq "Present") {
        Write-Verbose -Message "Creating Service Application Pool $Name"
        Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
            $params = $args[0]
            
            New-SPServiceApplicationPool -Name $params.Name  -Account $params.ServiceAccount
            
            $sap = Get-SPServiceApplicationPool -Identity $params.Name -ErrorAction SilentlyContinue
            if ($null -eq $sap) { 
                
            } else {
                if ($sap.ProcessAccountName -ne $params.ServiceAccount) {  
                    Set-SPServiceApplicationPool -Identity $params.Name -Account $params.ServiceAccount
                }
            }
        }
    }
    if ($CurrentValues.Ensure -eq "Present" -and $Ensure -eq "Present") {
        Write-Verbose -Message "Updating Service Application Pool $Name"
        Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
            $params = $args[0]
            
            $sap = Get-SPServiceApplicationPool -Identity $params.Name -ErrorAction SilentlyContinue
            if ($sap.ProcessAccountName -ne $params.ServiceAccount) {  
                Set-SPServiceApplicationPool -Identity $params.Name -Account $params.ServiceAccount
            }
        }
    }
    if ($Ensure -eq "Absent") {
        Write-Verbose -Message "Removing Service Application Pool $Name"
        Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
            $params = $args[0]
            
            Remove-SPServiceApplicationPool -Identity $params.Name -Confirm:$false
        }
    } 
}

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Name,
        [parameter(Mandatory = $true)]  [System.String] $ServiceAccount,
        [parameter(Mandatory = $false)] [ValidateSet("Present","Absent")] [System.String] $Ensure = "Present",
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    $CurrentValues = Get-TargetResource @PSBoundParameters
    Write-Verbose -Message "Testing service application pool '$Name'"
    $PSBoundParameters.Ensure = $Ensure
    if ($Ensure -eq "Present") {
        return Test-SPDSCSpecificParameters -CurrentValues $CurrentValues -DesiredValues $PSBoundParameters -ValuesToCheck @("ServiceAccount", "Ensure")
    } else {
        return Test-SPDSCSpecificParameters -CurrentValues $CurrentValues -DesiredValues $PSBoundParameters -ValuesToCheck @("Ensure")    
    }    
}

Export-ModuleMember -Function *-TargetResource