DetectR_EnhancedLogging

# Custom detection script for Intune Win32 app with enhanced logging

# Define log file path
$logFilePath = "C:\ProgramData\Microsoft\IntuneApps\UpgradeR\Upgrader.log"
if (-not (Test-Path "C:\ProgramData\Microsoft\IntuneApps\UpgradeR")) {
    New-Item -ItemType Directory -Path "C:\ProgramData\Microsoft\IntuneApps\UpgradeR" -Force
}

# Function to write log entries
function Write-Log {
    param (
        [string]$message
    )
    $timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
    $logMessage = "$timestamp - $message"
    Add-Content -Path $logFilePath -Value $logMessage
    Write-Host $logMessage
}

Write-Log "Starting detection process."

# Ensure Chocolatey is installed
if (-not (Get-Command choco -ErrorAction SilentlyContinue)) {
    Write-Log "Chocolatey is not installed."
    exit 1  # Chocolatey is not installed
} else {
    Write-Log "Chocolatey is installed."
}

function Get-ChocoPackageVersion {
    param (
        [string]$packageName
    )
    Write-Log "Getting installed version for $packageName..."
    $package = choco list --local-only $packageName | Select-String -Pattern $packageName
    if ($package) {
        $version = $package -replace '.*\|', ''
        Write-Log "Installed version of $packageName: $version"
        return $version
    } else {
        Write-Log "$packageName is not installed."
        return $null
    }
}

function Get-LatestChocoPackageVersion {
    param (
        [string]$packageName
    )
    Write-Log "Getting latest version for $packageName from Chocolatey..."
    $packageInfo = choco info $packageName
    $latestVersion = $packageInfo | Select-String -Pattern "$packageName\s+(\d+(\.\d+)+)" | ForEach-Object { $_.Matches[0].Groups[1].Value }
    if ($latestVersion) {
        Write-Log "Latest version of $packageName: $latestVersion"
        return $latestVersion
    } else {
        Write-Log "Could not retrieve latest version for $packageName from Chocolatey."
        return $null
    }
}

$requiredPackages = @("r.project", "rstudio", "rtools")
$allUpToDate = $true

foreach ($package in $requiredPackages) {
    $installedVersion = Get-ChocoPackageVersion -packageName $package
    $latestVersion = Get-LatestChocoPackageVersion -packageName $package

    if (-not $installedVersion) {
        Write-Log "$package is not installed."
        $allUpToDate = $false
    } elseif ([version]$installedVersion -lt [version]$latestVersion) {
        Write-Log "$package is installed but not up-to-date. Installed version: $installedVersion, Latest version: $latestVersion"
        $allUpToDate = $false
    } else {
        Write-Log "$package is up-to-date. Installed version: $installedVersion, Latest version: $latestVersion"
    }
}

if ($allUpToDate) {
    Write-Log "All required packages are installed and up-to-date."
    exit 0  # Exit code 0 means the application is detected and up-to-date
} else {
    Write-Log "One or more required packages are not installed or not up-to-date."
    exit 1  # Exit code 1 means the application is not detected or not up-to-date
}