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<#
.SYNOPSIS
    Gets the BitLocker protection status.
.DESCRIPTION
    Gets the BitLocker protection status for a specific drive, or all drives.
.PARAMETER DriveType
    Specifies the drive type(s) for which to get the bitlocker status. Default is: '3'.
    Available values
        0   DRIVE_UNKNOWN
        1   DRIVE_NO_ROOT_DIR
        2   DRIVE_REMOVABLE
        3   DRIVE_FIXED
        4   DRIVE_REMOTE
        5   DRIVE_CDROM
        6   DRIVE_RAMDISK
    These values are just for reference you probably will never use them.
.PARAMETER DriveLetter
    Specifies the drive letter(s) for which to get the bitlocker status. Default is: 'All'.
.PARAMETER ShowTableHeaders
    This switch specifies to show the table headers. Default: $false.
.EXAMPLE
    Get-BitLockerStatus.ps1 -DriveLetter 'All'
.EXAMPLE
    Get-BitLockerStatus.ps1 -DriveType '2'
.EXAMPLE
    Get-BitLockerStatus.ps1 -DriveType '2','3' -DriveLetter 'C:','D:'
.INPUTS
    System.String.
.OUTPUTS
    System.String.
.NOTES
    Created by Ioan Popovici
.LINK
    https://SCCM.Zone/Get-BitlockerStatus
.LINK
    https://SCCM.Zone/Get-BitlockerStatus-CHANGELOG
.LINK
    https://SCCM.Zone/Get-BitlockerStatus-GIT
.LINK
    https://SCCM.Zone/Issues
.COMPONENT
    BitLocker
.FUNCTIONALITY
    Get BitLocker status
#>

## Set script requirements
#Requires -Version 3.0

##*=============================================
##* VARIABLE DECLARATION
##*=============================================
#region VariableDeclaration

## Get script parameters
Param (
    [Parameter(Mandatory = $false, Position = 0)]
    [ValidateNotNullorEmpty()]
    [Alias('Type')]
    [string[]]$DriveType = '3',
    [Parameter(Mandatory = $false, Position = 1)]
    [ValidateNotNullorEmpty()]
    [Alias('Drive')]
    [string[]]$DriveLetter = 'All',
    [Parameter(Mandatory = $false, Position = 2)]
    [ValidateNotNullorEmpty()]
    [Alias('ShowHeaders')]
    [switch]$ShowTableHeaders = $false
)

#endregion
##*=============================================
##* END VARIABLE DECLARATION
##*=============================================

## Set table headers
[boolean]$HideTableHeaders = If ($ShowTableHeaders) { $false } Else { $true }

##*=============================================
##* FUNCTION LISTINGS
##*=============================================
#region FunctionListings

#region Function Get-BitLockerStatus
Function Get-BitLockerStatus {
<#
.SYNOPSIS
    Gets the BitLocker protection status.
.DESCRIPTION
    Gets the BitLocker protection status for a specific drive, or all drives.
.PARAMETER DriveType
    Specifies the drive type(s) for which to get the bitlocker status. Default is: '3'.
    Available values
        0   DRIVE_UNKNOWN
        1   DRIVE_NO_ROOT_DIR
        2   DRIVE_REMOVABLE
        3   DRIVE_FIXED
        4   DRIVE_REMOTE
        5   DRIVE_CDROM
        6   DRIVE_RAMDISK
    These values are just for reference you probably will never use them.
.PARAMETER DriveLetter
    Specifies the drive letter(s) for which to get the bitlocker status. Default is: 'All'.
.PARAMETER ShowTableHeaders
    This switch specifies to show the table headers. Default: $false.
.EXAMPLE
    Get-BitLockerStatus -DriveLetter 'All'
.EXAMPLE
    Get-BitLockerStatus -DriveType '2'
.EXAMPLE
    Get-BitLockerStatus -DriveType '2','3' -DriveLetter 'C:','D:'
.INPUTS
    System.String.
.OUTPUTS
    System.String.
.NOTES
    This is an internal script function and should typically not be called directly.
.LINK
    https://SCCM.Zone
.LINK
    https://SCCM.Zone/GIT
.COMPONENT
    BitLocker
.FUNCTIONALITY
    Get BitLocker status
#>
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $false, Position = 0)]
        [ValidateNotNullorEmpty()]
        [Alias('Type')]
        [string[]]$DriveType = '3',
        [Parameter(Mandatory = $false, Position = 1)]
        [ValidateNotNullorEmpty()]
        [Alias('Drive')]
        [string[]]$DriveLetter = 'All'
    )

    Begin {

        ## Initializing Result Object
        [psCustomObject]$Result = @()
    }
    Process {
        Try {

            ##  Get the local drives from WMI
            [psObject]$LocalDrives = Get-CimInstance -Namespace 'root\CIMV2' -ClassName 'CIM_LogicalDisk' | Where-Object -Property 'DriveType' -in $DriveType

            ## Get the BitLocker Status for all drives from WMI
            Get-CimInstance  -Namespace 'root\CIMV2\Security\MicrosoftVolumeEncryption'  -ClassName 'Win32_EncryptableVolume' -ErrorAction 'Stop' | `
                Where-Object -Property 'DriveLetter' -in $($LocalDrives.DeviceID) | `
                ForEach-Object {

                #  Get the drive type
                [string]$GetDriveType = $($LocalDrives | Where-Object -Property 'DeviceID' -eq $($_.DriveLetter)) | Select-Object -ExpandProperty 'DriveType'

                #  Create the Result Props and make the ProtectionStatus more report friendly
                [hashtable]$ResultProps = [ordered]@{
                    'Drive'            = $($_.DriveLetter)
                    'ProtectionStatus' = $(
                        Switch ($_.ProtectionStatus) {
                            0 { 'PROTECTION OFF' }
                            1 { 'PROTECTION ON' }
                            2 { 'PROTECTION UNKNOWN' }
                        }
                    )
                    'EncryptionStatus' = $(
                        Switch ($_.ConversionStatus) {
                            0 { 'FullyDecrypted' }
                            1 { 'FullyEncrypted' }
                            2 { 'EncryptionInProgress' }
                            3 { 'DecryptionInProgress' }
                            4 { 'EncryptionPaused' }
                            5 { 'DecryptionPaused' }
                        }
                    )
                    'DriveType' = 'Type ' + $GetDriveType
                }

                #  Adding ResultProps hash table to result object
                $Result += New-Object PSObject -Property $ResultProps
            }

            #  Workaround for some Windows 7 computers not reporting BitLocker protection status for all drives
            #  Create the ResultProps array
            $LocalDrives | ForEach-Object {
                If ($($_.DeviceID) -notin $($Result.Drive)) {
                    $ResultProps = [ordered]@{
                        'Drive'            = $($_.DeviceID)
                        'ProtectionStatus' = 'PROTECTION OFF'
                        'DriveType'        = $($_.DriveType)
                    }

                    #  Adding ResultProps hash table to result object
                    $Result += New-Object PSObject -Property $ResultProps
                }
            }
        }

        ## Catch any script errors
        Catch {
            Write-Error -Message "Script Execution Error!`n $_" -Category 'NotSpecified'
        }
        Finally {

            ## Filter result depending the DriveLetter parameter
            If ($DriveLetter -ne 'All') {
                Write-Output -InputObject $($Result | Where-Object -Property 'Drive' -in $DriveLetter)
            }
            Else {
                Write-Output -InputObject $Result
            }
        }
    }
    End {
    }
}
#endregion

#endregion
##*=============================================
##* END FUNCTION LISTINGS
##*=============================================

##*=============================================
##* SCRIPT BODY
##*=============================================
#region ScriptBody

## Write BitLockerStatus to console
[string]$Result = $(Get-BitLockerStatus -DriveType $DriveType -DriveLetter $DriveLetter | Format-Table -HideTableHeaders:$HideTableHeaders | Out-String)
Write-Output $Result

#endregion
##*=============================================
##* END SCRIPT BODY
##*=============================================