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<# 
 
.Synopsis 
    Gets the uninstall string for a program. 
.Description 
    Gets the uninstall string for a program, can be filtered to a key word of the programs display name. 
.Inputs 
    System.String 
.Outputs 
    System.Management.Automation.PSCustomObject 
.Parameter Name 
    System.String 
    The DisplayName of the software. 
.Parameter Filter 
    System.String 
    Filter output based on the DisplayName property. 
.Parameter ShowNulls 
    System.Management.Automation.SwitchParameter 
    Returns software products with empty uninstall values. 
.Example 
    PS C:\> Get-ProgramUninstallString -Name "Google Chrome" 
     
    Name Version Guid UninstallString 
    ---- ------- ---- --------------- 
    Google Chrome 57.0.2987.110 {4F711ED6-6E14-3607-A3CA-E3282AFE87B6} MsiExec.exe /X{4F711ED6-6E14-3607-A3CA-E3282AFE87B6} 
.Example 
    PS C:\> Get-ProgramUninstallString -Filter "Google*" 
 
    Name Version Guid UninstallString 
    ---- ------- ---- --------------- 
    Google Chrome 57.0.2987.110 {4F711ED6-6E14-3607-A3CA-E3282AFE87B6} MsiExec.exe /X{4F711ED6-6E14-3607-A3CA-E3282AFE87B6} 
    Google Update Helper 1.3.32.7 {60EC980A-BDA2-4CB6-A427-B07A5498B4CA} MsiExec.exe /I{60EC980A-BDA2-4CB6-A427-B07A5498B4CA} 
.Notes 
    None. 
.Link 
    https://dotps1.github.io 
.Link 
    https://www.powershellgallery.com/packages/Get-ProgramUninstallString 
.Link 
    https://grposh.github.io 
 
#>
[CmdletBinding(
    DefaultParameterSetName = "ByName"
)]

[OutputType(
    [PSCustomObject]
)]

param (
    [Parameter(
        ParameterSetName = "ByName",
        ValueFromPipeline = $true,
        ValueFromPipelineByPropertyName = $true
    )]
    [Alias(
        "DisplayName"
    )]
    [String[]]
    $Name,

    [Parameter(
        ParameterSetName = "ByFilter"
    )]
    [String]
    $Filter = "*",

    [Parameter()]
    [Switch]
    $ShowNulls
)

begin {
    try {
        if (Test-Path -Path "HKLM:\SOFTWARE\WOW6432Node") {
            $programs = Get-ItemProperty -Path "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*" -ErrorAction Stop
        }
        $programs += Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" -ErrorAction Stop
        $programs += Get-ItemProperty -Path "Registry::\HKEY_USERS\*\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" -ErrorAction SilentlyContinue
    } catch {
        Write-Error $_
        break
    }
}

process {
    if ($PSCmdlet.ParameterSetName -eq "ByName") {
        foreach ($nameValue in $Name) {
            $programs = $programs.Where({ 
                $_.DisplayName -eq $nameValue
            })
        }
    } else {
        $programs = $programs.Where({ 
            $_.DisplayName -like "*$Filter*" 
        })
    }

    if ($null -ne $programs) {
        if (-not ($ShowNulls.IsPresent)) {
            $programs = $programs.Where({
                -not [String]::IsNullOrEmpty(
                    $_.UninstallString
                )
            })
        }

        $output = $programs.ForEach({
            [PSCustomObject]@{
                Name = $_.DisplayName
                Version = $_.DisplayVersion
                Guid = $_.PSChildName
                UninstallString = $_.UninstallString
            }
        })

        Write-Output -InputObject $output
    }
}