DSCResources/MSFT_SPWebAppSiteUseAndDeletion/MSFT_SPWebAppSiteUseAndDeletion.psm1

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Url,
        [parameter(Mandatory = $false)] [System.Boolean] $SendUnusedSiteCollectionNotifications,
        [parameter(Mandatory = $false)] [System.UInt32] $UnusedSiteNotificationPeriod,
        [parameter(Mandatory = $false)] [System.Boolean] $AutomaticallyDeleteUnusedSiteCollections,
        [parameter(Mandatory = $false)] [ValidateRange(28,168)]  [System.UInt32] $UnusedSiteNotificationsBeforeDeletion,
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    Write-Verbose -Message "Getting web application '$url' site use and deletion settings"

    $result = Invoke-SPDSCCommand -Credential $InstallAccount -Arguments $PSBoundParameters -ScriptBlock {
        $params = $args[0]
        
        try {
            $spFarm = Get-SPFarm
        } catch {
            Write-Verbose -Verbose "No local SharePoint farm was detected. Site Use and Deletion settings will not be applied"
            return $null
        }

        $wa = Get-SPWebApplication -Identity $params.Url -ErrorAction SilentlyContinue
        if ($null -eq $wa) { return $null }

        return @{
            # Set the Site Use and Deletion settings
            Url = $params.Url
            SendUnusedSiteCollectionNotifications = $wa.SendUnusedSiteCollectionNotifications
            UnusedSiteNotificationPeriod = $wa.UnusedSiteNotificationPeriod.TotalDays
            AutomaticallyDeleteUnusedSiteCollections = $wa.AutomaticallyDeleteUnusedSiteCollections
            UnusedSiteNotificationsBeforeDeletion = $wa.UnusedSiteNotificationsBeforeDeletion
            InstallAccount = $params.InstallAccount
        }
    }

    return $result
}


function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Url,
        [parameter(Mandatory = $false)] [System.Boolean] $SendUnusedSiteCollectionNotifications,
        [parameter(Mandatory = $false)] [System.UInt32] $UnusedSiteNotificationPeriod,
        [parameter(Mandatory = $false)] [System.Boolean] $AutomaticallyDeleteUnusedSiteCollections,
        [parameter(Mandatory = $false)] [ValidateRange(28,168)]  [System.UInt32] $UnusedSiteNotificationsBeforeDeletion,
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    Write-Verbose -Message "Setting web application '$Url' Site Use and Deletion settings"


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

        try {
            $spFarm = Get-SPFarm
        } catch {
            throw "No local SharePoint farm was detected. Site Use and Deletion settings will not be applied"
            return
        }
        
        $wa = Get-SPWebApplication -Identity $params.Url -ErrorAction SilentlyContinue
        if ($null -eq $wa) { 
            throw "Configured web application could not be found"
            return
        }

        Write-Verbose -Verbose "Start update"

        # Set the Site Use and Deletion settings
        if ($params.ContainsKey("SendUnusedSiteCollectionNotifications")) { $wa.SendUnusedSiteCollectionNotifications = $params.SendUnusedSiteCollectionNotifications }
        if ($params.ContainsKey("UnusedSiteNotificationPeriod")) { 
            $timespan = New-TimeSpan -Days $params.UnusedSiteNotificationPeriod
            $wa.UnusedSiteNotificationPeriod = $timespan
        }
        if ($params.ContainsKey("AutomaticallyDeleteUnusedSiteCollections")) { $wa.AutomaticallyDeleteUnusedSiteCollections = $params.AutomaticallyDeleteUnusedSiteCollections }
        if ($params.ContainsKey("UnusedSiteNotificationsBeforeDeletion")) { $wa.UnusedSiteNotificationsBeforeDeletion = $params.UnusedSiteNotificationsBeforeDeletion }
        
        $wa.Update()
    }
}


function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        [parameter(Mandatory = $true)]  [System.String] $Url,
        [parameter(Mandatory = $false)] [System.Boolean] $SendUnusedSiteCollectionNotifications,
        [parameter(Mandatory = $false)] [System.UInt32] $UnusedSiteNotificationPeriod,
        [parameter(Mandatory = $false)] [System.Boolean] $AutomaticallyDeleteUnusedSiteCollections,
        [parameter(Mandatory = $false)] [ValidateRange(28,168)]  [System.UInt32] $UnusedSiteNotificationsBeforeDeletion,
        [parameter(Mandatory = $false)] [System.Management.Automation.PSCredential] $InstallAccount
    )

    Write-Verbose -Message "Testing for web application '$Url' Site Use and Deletion"
    $CurrentValues = Get-TargetResource @PSBoundParameters
    if ($null -eq $CurrentValues) { return $false }

    return Test-SPDSCSpecificParameters -CurrentValues $CurrentValues -DesiredValues $PSBoundParameters
}

Export-ModuleMember -Function *-TargetResource