$bootstrapperLocalPath = "\\domain.net\dfs$\Admin\SoftwareRepository\SWD\Microsoft\Teams\teamsbootstrapper.exe"
$teamsInstallerLocalPath = "\\domain.net\dfs$\Admin\SoftwareRepository\SWD\Microsoft\Teams\MSTeams-x64.msix"

$bootstrapperRemoteUrl = "https://go.microsoft.com/fwlink/?linkid=2243204"
$teamsInstallerRemoteUrl = "https://go.microsoft.com/fwlink/?linkid=2196106"

# Function to check if a file needs to be updated or downloaded if it doesn't exist
function NeedsUpdateOrDownload($localPath, $remoteUrl) {
    if (-not (Test-Path $localPath)) {
        return $true
    }
    $localLastModified = (Get-Item $localPath).LastWriteTime
    $remoteLastModified = (Invoke-WebRequest -Uri $remoteUrl -Method Head).Headers.LastModified
    return $localLastModified -lt $remoteLastModified
}

# Check if bootstrapper needs update or download
if (NeedsUpdateOrDownload $bootstrapperLocalPath $bootstrapperRemoteUrl) {
    Write-Host "Downloading latest Teams Bootstrapper..."
    Invoke-WebRequest -Uri $bootstrapperRemoteUrl -OutFile $bootstrapperLocalPath -UseBasicParsing -Verbose
} else {
    Write-Host "Teams Bootstrapper is up to date."
}

# Check if Teams installer needs update or download
if (NeedsUpdateOrDownload $teamsInstallerLocalPath $teamsInstallerRemoteUrl) {
    Write-Host "Downloading latest Microsoft Teams version..."
    Invoke-WebRequest -Uri $teamsInstallerRemoteUrl -OutFile $teamsInstallerLocalPath -UseBasicParsing -Verbose
} else {
    Write-Host "Microsoft Teams installer is up to date."
}