DSCResources/MSFT_EXOMailboxSettings/MSFT_EXOMailboxSettings.psm1

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

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

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

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

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

    Write-Verbose -Message "Getting configuration of Office 365 Mailbox Settings for $DisplayName"
    #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

    $nullReturn = @{
        DisplayName = $DisplayName
        TimeZone    = $null
        Locale      = $null
        Ensure      = "Absent"
    }

    Test-MSCloudLogin -CloudCredential $GlobalAdminAccount `
        -Platform ExchangeOnline

    try
    {
        $mailboxSettings = Get-MailboxRegionalConfiguration -Identity $DisplayName -ErrorAction Stop
    }
    catch
    {
        return $nullReturn
    }

    if ($null -eq $mailboxSettings)
    {
        Write-Verbose -Message "The specified Mailbox doesn't already exist."
        return $nullReturn
    }

    $result = @{
        DisplayName        = $DisplayName
        TimeZone           = $mailboxSettings.TimeZone
        Locale             = $mailboxSettings.Language.Name
        Ensure             = "Present"
        GlobalAdminAccount = $GlobalAdminAccount
    }
    Write-Verbose -Message "Found an existing instance of Mailbox '$($DisplayName)'"
    return $result
}

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

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

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

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

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

    Write-Verbose -Message "Setting configuration of Office 365 Mailbox Settings for $DisplayName"
    #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 ExchangeOnline

    $currentMailbox = Get-TargetResource @PSBoundParameters

    # CASE: Mailbox doesn't exist but should;
    if ($Ensure -eq "Present" -and $currentMailbox.Ensure -eq "Absent")
    {
        throw "The specified mailbox {$($DisplayName)} does not exist."
    }

    $AllowedTimeZones = (Get-ChildItem "HKLM:\Software\Microsoft\Windows NT\CurrentVersion\Time zones" | `
            ForEach-Object { Get-ItemProperty $_.PSPath }).PSChildName

    if ($AllowedTimeZones.Contains($TimeZone) -eq $false)
    {
        throw "The specified Time Zone {$($TimeZone)} is not valid."
    }


    Set-MailboxRegionalConfiguration -Identity $DisplayName `
        -Language $Locale `
        -TimeZone $TimeZone
}

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

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

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

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

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

    Write-Verbose -Message "Testing configuration of Office 365 Mailbox Settings for $DisplayName"

    $CurrentValues = Get-TargetResource @PSBoundParameters

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

    $TestResult = Test-Microsoft365DSCParameterState -CurrentValues $CurrentValues `
        -Source $($MyInvocation.MyCommand.Source) `
        -DesiredValues $PSBoundParameters `
        -ValuesToCheck @("Ensure", `
            "DisplayName", `
            "TimeZone", `
            "Locale")

    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 ExchangeOnline

    $mailboxes = Get-Mailbox -ResultSize 'Unlimited'

    $i = 1
    $content = ''
    foreach ($mailbox in $mailboxes)
    {
        Write-Information " [$i/$($mailboxes.Length)] $($mailbox.Name)"
        $mailboxName = $mailbox.Name
        if (![System.String]::IsNullOrEmpty($mailboxName))
        {
            $params = @{
                GlobalAdminAccount = $GlobalAdminAccount
                DisplayName        = $mailboxName
            }
            $result = Get-TargetResource @params

            if ($result.Ensure -eq "Present")
            {
                $result.GlobalAdminAccount = Resolve-Credentials -UserName "globaladmin"
                $modulePath = $PSScriptRoot + "\MSFT_EXOMailboxSettings.psm1"
                $content += " EXOMailboxSettings " + (New-GUID).ToString() + "`r`n"
                $content += " {`r`n"
                $currentDSCBlock = Get-DSCBlock -Params $result -ModulePath $modulePath
                $content += Convert-DSCStringParamToVariable -DSCBlock $currentDSCBlock -ParameterName "GlobalAdminAccount"
                $content += " }`r`n"
            }
        }
        $i++
    }
    return $content
}

Export-ModuleMember -Function *-TargetResource