<#
.SYNOPSIS
Helper script to use as detection method with Intune or SCCM.

.DESCRIPTION
This script uses `winget export` to detect if a specific application is installed.
Intended for use as a detection rule script in Intune or SCCM deployments.
#>

#Change app to detect [Application ID]
$AppToDetect = "Notepad++.Notepad++"


<# FUNCTIONS #>

Function Get-WingetCmd {

    $WingetCmd = $null

    #Get WinGet Path
    try {
        #Get Admin Context Winget Location
        $WingetInfo = (Get-Item "$env:ProgramFiles\WindowsApps\Microsoft.DesktopAppInstaller_*_8wekyb3d8bbwe\winget.exe").VersionInfo | Sort-Object -Property FileVersionRaw
        #If multiple versions, pick most recent one
        $WingetCmd = $WingetInfo[-1].FileName
    }
    catch {
        #Get User context Winget Location
        if (Test-Path "$env:LocalAppData\Microsoft\WindowsApps\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\winget.exe") {
            $WingetCmd = "$env:LocalAppData\Microsoft\WindowsApps\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\winget.exe"
        }
    }

    return $WingetCmd
}

<# MAIN #>

#Get WinGet Location Function
$winget = Get-WingetCmd

#Set json export file
$JsonFile = "$env:TEMP\InstalledApps.json"

#Get installed apps and version in json file
& $Winget export -o $JsonFile --accept-source-agreements | Out-Null

#Get json content
$Json = Get-Content $JsonFile -Raw | ConvertFrom-Json

#Get apps and version in hashtable
$Packages = $Json.Sources.Packages

#Remove json file
Remove-Item $JsonFile -Force

# Search for specific app and version
$Apps = $Packages | Where-Object { $_.PackageIdentifier -eq $AppToDetect }

if ($Apps) {
    return "Installed!"
}