# If any command fails unexpectedly, we want the script to stop
$ErrorActionPreference = "Stop"

# Was it a complete upload?
$endBy = $env:SSHUPLOADENDBY
if ($endBy -ne "client") {
	# We can be sure an upload is complete only if the file was closed by the client
	# If the file was closed by the SSH Server because of a disconnect, $endBy will equal "cleanup"
	# If the upload was incomplete, this script performs a normal exit and does nothing
	# The client might reconnect and resume the upload
	exit
}

# Obtain the file name
$filePath = $env:SSHUPLOADFILE
if (-not $filePath) {
	Write-Error "Could not determine file name: environment variable SSHUPLOADFILE not set"
}

# If it's a virtual account, use the virtual account name
# If it's not a virtual account, use the Windows account name
$userName = $env:VIRTUSER
if (-not $userName) {
	$userName = $env:SSHWINUSER
	if (-not $userName) {
		Write-Error "Could not determine user name: environment variables VIRTUSER or SSHWINUSER not set"
	}
}

# Use the current date
# Alternative #1: could also use the file modification time set by the client
# $file = Get-Item -LiteralPath $filePath
# $destDate = $file.LastWriteTime
# Alternative #2: If filename is in specific format, could also parse the date from filename
$destDate = Get-Date
$destDateStr = $destDate.ToString("yyyy-MM-dd")

# Construct destination directory path
# We're moving the file into a subdirectory of $destDirRoot. Example: C:\Incoming\Username\2022-03-17\
$destDirRoot = "C:\Incoming"
$destDirUser = Join-Path $destDirRoot $userName
$destDirPath = Join-Path $destDirUser $destDateStr

# If the destination directory does not yet exist, create it
if (-not (Test-Path -PathType Container -LiteralPath $destDirPath)) {
	# Assignment to variable avoids New-Item generating output
	$destDir = New-Item -ItemType Directory -Path $destDirPath
}

# Move the file
# The filename is partially controlled by the client and might use unexpected characters
# Use -LiteralPath instead of -Path to avoid insecure or unexpected behaviors
Move-Item -LiteralPath $filePath -Destination $destDirPath