#Requires -Version 5.1
[CmdletBinding()]
param(
	# Where CSVs are collected/accumulated. Overrides the in-script CONFIG block
	# below. See the CONFIG block for the easy place to set this permanently.
	[Parameter(Mandatory = $false)]
	[string]$OutputRoot,

	# Optional network share to mirror the store into after a run. Overrides the
	# in-script CONFIG block below.
	[Parameter(Mandatory = $false)]
	[string]$PublishRoot,

	# Business identifier for this PC (workstation number). Defaults to hostname.
	[Parameter(Mandatory = $false)]
	[string]$AssetNumber,

	# Value written into assets.assettypeid for the PC (resolved by name).
	[Parameter(Mandatory = $false)]
	[string]$AssetType = 'Computer',

	# Value written into computers.computertypeid (resolved by name).
	[Parameter(Mandatory = $false)]
	[string]$ComputerType,

	# Value written into machines.machinetypeid (resolved by name).
	[Parameter(Mandatory = $false)]
	[string]$MachineType,

	# Explicit eDNC/UDC source overrides. When omitted, standard on-asset
	# locations are searched.
	[Parameter(Mandatory = $false)]
	[string]$RegPath,
	[Parameter(Mandatory = $false)]
	[string]$JsonPath,

	# Skip switches for partial runs.
	[switch]$SkipMachine,
	[switch]$SkipApps
)

<#
.SYNOPSIS
  Unified ShopDB site-adoption collector. Runs on any PC, collects the PC and any
  attached eDNC/DNC machine, and UPSERTS the results into a shared set of
  importable CSVs so a site can build its inventory PC by PC.

.DESCRIPTION
  Accumulating store under OutputRoot:
	vendors.csv, models.csv, operatingsystems.csv, assets.csv,
	computers.csv, machines.csv
  Rows are merged field-by-field on each table's natural key (a later run fills
  gaps and refreshes values without wiping data an earlier run captured).

  Phase-2 data that CSV cannot carry is written per entity under OutputRoot\sidecars:
	computer_<assetnumber>.json  (interfaces, installed apps)
	machine_<machinenumber>.json (PC<->Machine link, connection detail)

  Read-only against the machine. Local reads may run elevated; publishing to a
  share runs in the current user context only.

.NOTES
  PS 5.1 compatible. Headers match the ShopDB importer (see CSV-SCHEMA.md).
#>

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

# =============================================================================
# CONFIG - SET YOUR CSV DESTINATIONS HERE
# -----------------------------------------------------------------------------
# Two-stage flow so you can collect locally (possibly elevated) and then append
# the captured rows to a CSV store that lives on a network share:
#
#   1) LocalStageRoot   Fast, always-writable local folder where CSVs are built
#                       and merged. Collection can run elevated here.
#   2) NetworkStoreRoot The shared CSV store the whole site accumulates into and
#                       that you later point 'flask csv import --dir' at. Leave
#                       blank ('') to keep everything local. When set, the merged
#                       store is copied here at the end of the run. Network
#                       writes must happen as a STANDARD user - do NOT run the
#                       publish step elevated.
#
# Example network path: '\\fileserver\shopdb$\intake'
#
# Command-line -OutputRoot / -PublishRoot still override these values.
# =============================================================================

$LocalStageRoot   = Join-Path $env:ProgramData 'ShopDB\intake'
# Ship blank so a site that has not configured its share keeps everything local
# instead of publishing to another site's path. Set this to your own share (or
# pass -PublishRoot), e.g. '\\fileserver\shopdb$\intake'. The download endpoint
# fills this in from asset_import_csv_location when the site has set it.
$NetworkStoreRoot = ''

# Resolve effective destinations (command-line params win over CONFIG above).
if (-not $OutputRoot)  { $OutputRoot  = $LocalStageRoot }
if (-not $PublishRoot) { $PublishRoot = $NetworkStoreRoot }

# --- Store definitions (header order + natural key per importable table) -------

$script:Stores = [ordered]@{
	'vendors.csv'          = @{ key = 'vendor';      header = @('vendor') }
	'models.csv'           = @{ key = 'modelnumber'; header = @('modelnumber','vendorid','modeltypeid') }
	'operatingsystems.csv' = @{ key = 'osname';      header = @('osname') }
	'assets.csv'           = @{ key = 'assetnumber'; header = @('assetnumber','assettypeid','name','statusid','serialnumber','gaugelabreference','maintenancereference','locationid','businessunitid','notes') }
	'computers.csv'        = @{ key = 'assetid';      header = @('assetid','hostname','computertypeid','osid','vendorid','modelnumberid','loggedinuser','lastreporteddate','lastboottime') }
	'machines.csv'         = @{ key = 'assetid';      header = @('assetid','machinetypeid','vendorid','modelnumberid','controllervendorid','controllermodelid','requiresmanualconfig','islocationonly','notes') }
}

# --- Shared helpers -----------------------------------------------------------

function ConvertTo-CsvField {
	param([AllowNull()]$Value)
	if ($null -eq $Value) { return '' }
	$text = [string]$Value
	if ($text -match '[",\r\n]') { return '"' + ($text -replace '"', '""') + '"' }
	return $text
}

function Get-Prop {
	param([AllowNull()]$Object, [Parameter(Mandatory = $true)][string]$Name)
	if ($null -eq $Object) { return $null }
	$prop = $Object.PSObject.Properties[$Name]
	if ($null -eq $prop) { return $null }
	return $prop.Value
}

function Get-NonEmpty {
	param([AllowNull()]$Value)
	if ($null -ne $Value -and -not [string]::IsNullOrWhiteSpace([string]$Value)) {
		return ([string]$Value).Trim()
	}
	return $null
}

function Get-FirstNonEmpty {
	param([object[]]$Values)
	foreach ($v in $Values) { $n = Get-NonEmpty $v; if ($n) { return $n } }
	return $null
}

function Format-ShopDbDate {
	param([AllowNull()]$Value)
	if ($null -eq $Value) { return $null }
	try { return ([datetime]$Value).ToString('yyyy-MM-dd HH:mm:ss') } catch { return $null }
}

function Write-Utf8NoBom {
	param([string]$Path, [string]$Content)
	$encoding = New-Object System.Text.UTF8Encoding($false)
	[System.IO.File]::WriteAllText($Path, $Content, $encoding)
}

# Field-level upsert into a persistent CSV store, keyed by natural key. Existing
# values are kept when the incoming cell is empty, so a partial run never blanks
# out data an earlier run captured.
function Merge-CsvStore {
	param(
		[Parameter(Mandatory = $true)][string]$Path,
		[Parameter(Mandatory = $true)][string[]]$Header,
		[Parameter(Mandatory = $true)][string]$Key,
		[Parameter(Mandatory = $true)][AllowNull()][object[]]$IncomingRows
	)

	$index = [ordered]@{}
	if (Test-Path -LiteralPath $Path) {
		foreach ($existing in @(Import-Csv -LiteralPath $Path)) {
			$keyVal = Get-NonEmpty (Get-Prop $existing $Key)
			if (-not $keyVal) { continue }
			$index[$keyVal.ToLowerInvariant()] = $existing
		}
	}

	$changed = 0
	foreach ($row in $IncomingRows) {
		if ($null -eq $row) { continue }
		$keyVal = Get-NonEmpty (Get-Prop $row $Key)
		if (-not $keyVal) { continue }
		$lc = $keyVal.ToLowerInvariant()
		if ($index.Contains($lc)) {
			$target = $index[$lc]
			foreach ($col in $Header) {
				$incoming = Get-NonEmpty (Get-Prop $row $col)
				if ($incoming) {
					if ($target.PSObject.Properties[$col]) { $target.$col = $incoming }
					else { $target | Add-Member -NotePropertyName $col -NotePropertyValue $incoming -Force }
				}
			}
		} else {
			$fresh = [ordered]@{}
			foreach ($col in $Header) { $fresh[$col] = Get-NonEmpty (Get-Prop $row $col) }
			$index[$lc] = [pscustomobject]$fresh
		}
		$changed++
	}

	$lines = New-Object System.Collections.Generic.List[string]
	$lines.Add(($Header -join ','))
	foreach ($stored in $index.Values) {
		$cells = foreach ($col in $Header) { ConvertTo-CsvField (Get-Prop $stored $col) }
		$lines.Add(($cells -join ','))
	}
	Write-Utf8NoBom -Path $Path -Content (($lines -join "`r`n") + "`r`n")
	return $changed
}

# --- eDNC/UDC parsing (registry, .reg export, UDC settings json) --------------

function Resolve-ControllerVendor {
	param([AllowNull()][string]$ControlType, [AllowNull()][string]$NcIF)
	$ct = ('' + $ControlType).Trim().ToUpperInvariant()
	$nc = ('' + $NcIF).Trim().ToUpperInvariant()
	if ($nc -eq 'EFOCAS' -or $ct -eq 'EFOCAS') { return 'FANUC' }
	if ($ct -eq 'SIEMENS') { return 'Siemens' }
	if ($ct -eq 'OKUMA')   { return 'Okuma' }
	return $null
}

function Read-RegExport {
	param([Parameter(Mandatory = $true)][string]$Path)
	$lines = @(Get-Content -LiteralPath $Path -Encoding Unicode -ErrorAction Stop)
	$firstMeaningful = ($lines | Where-Object { $_ -match '\S' } | Select-Object -First 1)
	if (-not ($firstMeaningful -match '^(REGEDIT4|Windows Registry Editor Version)')) {
		$lines = @(Get-Content -LiteralPath $Path -Encoding Default -ErrorAction Stop)
	}
	$data = @{}
	$currentKey = $null
	foreach ($raw in $lines) {
		$line = $raw.Trim()
		if ([string]::IsNullOrWhiteSpace($line)) { continue }
		if ($line -match '^(REGEDIT4|Windows Registry Editor Version)') { continue }
		if ($line -match '^\s*;') { continue }
		if ($line -match '^\[(?<key>[^\]]+)\]$') {
			$currentKey = $Matches['key']
			if (-not $data.ContainsKey($currentKey)) { $data[$currentKey] = @{} }
			continue
		}
		if (-not $currentKey) { continue }
		if ($line -match '^"(?<name>[^"]+)"=(?<rhs>.+)$') {
			$name = $Matches['name']
			$rhs = $Matches['rhs'].Trim()
			if ($rhs -match '^"(?<s>.*)"$') { $val = $Matches['s'] }
			elseif ($rhs -match '^dword:(?<hex>[0-9a-fA-F]{8})$') { $val = [Convert]::ToInt32($Matches['hex'], 16) }
			else { $val = $rhs }
			$data[$currentKey][$name] = $val
		}
	}
	return $data
}

function Get-RegExportValue {
	param([hashtable]$Reg, [string]$KeySuffix, [string]$Name)
	foreach ($key in $Reg.Keys) {
		if ($key -match ('\\' + [regex]::Escape($KeySuffix) + '$')) {
			if ($Reg[$key].ContainsKey($Name)) { return $Reg[$key][$Name] }
		}
	}
	return $null
}

function ConvertFrom-RegExport {
	param([hashtable]$Reg)
	[ordered]@{
		source        = 'reg'
		machinenumber = Get-NonEmpty (Get-RegExportValue $Reg 'General' 'MachineNo')
		site          = Get-NonEmpty (Get-RegExportValue $Reg 'General' 'Site')
		controltype   = Get-NonEmpty (Get-RegExportValue $Reg 'General' 'Cnc')
		ncif          = Get-NonEmpty (Get-RegExportValue $Reg 'General' 'NcIF')
		dnctype       = 'eDNC'
		tcpaddress    = Get-NonEmpty (Get-RegExportValue $Reg 'eFocas' 'IpAddr')
		tcpport       = Get-NonEmpty (Get-RegExportValue $Reg 'eFocas' 'SocketNo')
		comport       = Get-NonEmpty (Get-RegExportValue $Reg 'PPDCS' 'Port Id')
		baudrate      = Get-NonEmpty (Get-RegExportValue $Reg 'PPDCS' 'Baud')
	}
}

function Get-RegistryValue {
	param([string]$Path, [string]$Name)
	if (-not (Test-Path -LiteralPath $Path)) { return $null }
	return Get-Prop (Get-ItemProperty -LiteralPath $Path -ErrorAction SilentlyContinue) $Name
}

function ConvertFrom-LiveRegistry {
	param([string]$Base)
	if (-not (Test-Path -LiteralPath $Base)) { return $null }
	$general = Join-Path $Base 'General'
	$efocas  = Join-Path $Base 'eFocas'
	$ppdcs   = Join-Path $Base 'PPDCS'
	[ordered]@{
		source        = 'registry'
		machinenumber = Get-NonEmpty (Get-RegistryValue $general 'MachineNo')
		site          = Get-NonEmpty (Get-RegistryValue $general 'Site')
		controltype   = Get-NonEmpty (Get-RegistryValue $general 'Cnc')
		ncif          = Get-NonEmpty (Get-RegistryValue $general 'NcIF')
		dnctype       = 'eDNC'
		tcpaddress    = Get-NonEmpty (Get-RegistryValue $efocas 'IpAddr')
		tcpport       = Get-NonEmpty (Get-RegistryValue $efocas 'SocketNo')
		comport       = Get-NonEmpty (Get-RegistryValue $ppdcs 'Port Id')
		baudrate      = Get-NonEmpty (Get-RegistryValue $ppdcs 'Baud')
	}
}

function ConvertFrom-UdcJson {
	param([string]$Path)
	$obj = Get-Content -LiteralPath $Path -Raw -ErrorAction Stop | ConvertFrom-Json
	$general  = Get-Prop $obj 'GeneralSettings'
	$ethernet = Get-Prop $obj 'EthernetSettings'
	$serial   = Get-Prop $obj 'SerialSettings'
	[ordered]@{
		source        = 'json'
		machinenumber = Get-NonEmpty (Get-Prop $general 'MachineNumber')
		site          = Get-NonEmpty (Get-Prop $general 'Site')
		controltype   = Get-NonEmpty (Get-Prop $general 'ControlType')
		ncif          = $null
		dnctype       = Get-NonEmpty (Get-Prop $general 'DncType')
		tcpaddress    = Get-NonEmpty (Get-Prop $ethernet 'TCPAddress')
		tcpport       = Get-NonEmpty (Get-Prop $ethernet 'TCPPort')
		comport       = Get-NonEmpty (Get-Prop $serial 'ComPort')
		baudrate      = Get-NonEmpty (Get-Prop $serial 'BaudRate')
	}
}

function Find-FirstFile {
	param([string[]]$Roots, [string]$Filter)
	foreach ($root in $Roots) {
		if (-not $root -or -not (Test-Path -LiteralPath $root)) { continue }
		$hit = Get-ChildItem -LiteralPath $root -Filter $Filter -File -ErrorAction SilentlyContinue |
			Sort-Object LastWriteTime -Descending | Select-Object -First 1
		if ($hit) { return $hit.FullName }
	}
	return $null
}

function Resolve-DncSource {
	param([string]$RegPath, [string]$JsonPath)
	if ($JsonPath -and (Test-Path -LiteralPath $JsonPath)) {
		Write-Host ('  machine source: JSON (explicit) ' + $JsonPath) -ForegroundColor DarkGray
		return ConvertFrom-UdcJson -Path $JsonPath
	}
	if ($RegPath -and (Test-Path -LiteralPath $RegPath)) {
		Write-Host ('  machine source: .reg (explicit) ' + $RegPath) -ForegroundColor DarkGray
		return ConvertFrom-RegExport -Reg (Read-RegExport -Path $RegPath)
	}
	foreach ($base in @(
		'HKLM:\SOFTWARE\GE Aircraft Engines\DNC',
		'HKLM:\SOFTWARE\WOW6432Node\GE Aircraft Engines\DNC')) {
		$fromReg = ConvertFrom-LiveRegistry -Base $base
		if ($fromReg -and $fromReg.machinenumber) {
			Write-Host ('  machine source: live registry ' + $base) -ForegroundColor DarkGray
			return $fromReg
		}
	}
	$localReg = Find-FirstFile -Roots @('C:\Program Files (x86)\Dnc', (Join-Path $env:SystemDrive 'GE Aerospace')) -Filter '*.reg'
	if ($localReg) {
		Write-Host ('  machine source: local .reg ' + $localReg) -ForegroundColor DarkGray
		return ConvertFrom-RegExport -Reg (Read-RegExport -Path $localReg)
	}
	$localJson = Find-FirstFile -Roots @((Join-Path $env:SystemDrive 'GE Aerospace'), 'C:\Program Files (x86)\UDC', 'C:\Program Files (x86)\Dnc') -Filter 'udc_settings_*.json'
	if ($localJson) {
		Write-Host ('  machine source: local UDC json ' + $localJson) -ForegroundColor DarkGray
		return ConvertFrom-UdcJson -Path $localJson
	}
	return $null
}

# --- PC collection (read-only) ------------------------------------------------

function Get-PcFacts {
	$computerSystem = Get-CimInstance Win32_ComputerSystem -ErrorAction SilentlyContinue
	$operatingSys   = Get-CimInstance Win32_OperatingSystem -ErrorAction SilentlyContinue
	$bios           = Get-CimInstance Win32_BIOS -ErrorAction SilentlyContinue

	$interfaces = @()
	try {
		foreach ($cfg in @(Get-NetIPConfiguration -ErrorAction SilentlyContinue)) {
			$adapter = $null
			try { $adapter = Get-NetAdapter -InterfaceAlias $cfg.InterfaceAlias -ErrorAction SilentlyContinue } catch {}
			if (-not $adapter -or (Get-Prop $adapter 'HardwareInterface') -ne $true) { continue }
			$ipv4 = @(Get-Prop $cfg 'IPv4Address') | Select-Object -First 1
			$interfaces += [ordered]@{
				interfacealias = [string]$cfg.InterfaceAlias
				ipaddress      = if ($ipv4) { [string](Get-Prop $ipv4 'IPAddress') } else { $null }
				macaddress     = [string](Get-Prop $adapter 'MacAddress')
			}
		}
	} catch {}

	$installedApps = @()
	if (-not $SkipApps) {
		foreach ($keyPath in @(
			'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*',
			'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*')) {
			foreach ($entry in @(Get-ItemProperty -Path $keyPath -ErrorAction SilentlyContinue)) {
				$displayName = Get-NonEmpty (Get-Prop $entry 'DisplayName')
				if (-not $displayName) { continue }
				if ((Get-Prop $entry 'SystemComponent') -eq 1) { continue }
				$installedApps += [ordered]@{
					appname          = $displayName
					installedversion = Get-NonEmpty (Get-Prop $entry 'DisplayVersion')
					publisher        = Get-NonEmpty (Get-Prop $entry 'Publisher')
				}
			}
		}
		$installedApps = @($installedApps | Sort-Object { $_.appname } -Unique)
	}

	[ordered]@{
		hostname      = Get-FirstNonEmpty @($env:COMPUTERNAME, (Get-Prop $computerSystem 'Name'))
		vendor        = Get-NonEmpty (Get-Prop $computerSystem 'Manufacturer')
		model         = Get-NonEmpty (Get-Prop $computerSystem 'Model')
		osname        = Get-NonEmpty (Get-Prop $operatingSys 'Caption')
		serial        = Get-FirstNonEmpty @((Get-Prop $bios 'SerialNumber'), (Get-Prop $computerSystem 'SerialNumber'))
		lastboot      = Format-ShopDbDate (Get-Prop $operatingSys 'LastBootUpTime')
		loggeduser    = Get-NonEmpty (Get-Prop $computerSystem 'UserName')
		interfaces    = $interfaces
		installedapps = $installedApps
	}
}

# --- Main ---------------------------------------------------------------------

Write-Host ''
Write-Host '  ShopDB unified collector' -ForegroundColor Cyan
Write-Host ('  ' + ('-' * 56)) -ForegroundColor DarkGray

if (-not (Test-Path -LiteralPath $OutputRoot)) { New-Item -ItemType Directory -Path $OutputRoot -Force | Out-Null }
$sidecarDir = Join-Path $OutputRoot 'sidecars'
if (-not (Test-Path -LiteralPath $sidecarDir)) { New-Item -ItemType Directory -Path $sidecarDir -Force | Out-Null }

$collectedAt = (Get-Date).ToString('yyyy-MM-dd HH:mm:ss')

$pc = Get-PcFacts
if (-not $AssetNumber) { $AssetNumber = $pc.hostname }

# Row sets keyed to the shared stores.
$vendorRows = @()
$modelRows  = @()
$osRows     = @()
$assetRows  = @()
$computerRows = @()
$machineRows  = @()

if ($pc.vendor) { $vendorRows += [pscustomobject]@{ vendor = $pc.vendor } }
if ($pc.model)  { $modelRows  += [pscustomobject]@{ modelnumber = $pc.model; vendorid = $pc.vendor; modeltypeid = $null } }
if ($pc.osname) { $osRows     += [pscustomobject]@{ osname = $pc.osname } }

$assetRows += [pscustomobject]@{
	assetnumber = $AssetNumber; assettypeid = $AssetType; name = $pc.hostname; statusid = $null
	serialnumber = $pc.serial; gaugelabreference = $null; maintenancereference = $null
	locationid = $null; businessunitid = $null
	notes = 'PC collected ' + $collectedAt
}
$computerRows += [pscustomobject]@{
	assetid = $AssetNumber; hostname = $pc.hostname; computertypeid = $ComputerType; osid = $pc.osname
	vendorid = $pc.vendor; modelnumberid = $pc.model; loggedinuser = $pc.loggeduser
	lastreporteddate = $collectedAt; lastboottime = $pc.lastboot
}

# Machine (best-effort).
$machine = $null
if (-not $SkipMachine) {
	try { $machine = Resolve-DncSource -RegPath $RegPath -JsonPath $JsonPath } catch { $machine = $null }
}
if ($machine -and $machine.machinenumber) {
	$controllerVendor = Resolve-ControllerVendor -ControlType $machine.controltype -NcIF $machine.ncif
	$transport = if ($machine.tcpaddress) { 'ethernet' } elseif ($machine.comport) { 'serial' } else { 'unknown' }
	$noteBits = @("DNC=$($machine.dnctype)")
	if ($machine.controltype) { $noteBits += "control=$($machine.controltype)" }
	$noteBits += "transport=$transport"
	$machineNote = 'eDNC collected ' + $collectedAt + '; ' + ($noteBits -join '; ')

	if ($controllerVendor) { $vendorRows += [pscustomobject]@{ vendor = $controllerVendor } }
	$assetRows += [pscustomobject]@{
		assetnumber = $machine.machinenumber; assettypeid = 'Machine'; name = $machine.machinenumber; statusid = $null
		serialnumber = $null; gaugelabreference = $null; maintenancereference = $null
		locationid = $null; businessunitid = $null; notes = $machineNote
	}
	$machineRows += [pscustomobject]@{
		assetid = $machine.machinenumber; machinetypeid = $MachineType; vendorid = $null; modelnumberid = $null
		controllervendorid = $controllerVendor; controllermodelid = $null
		requiresmanualconfig = $null; islocationonly = $null; notes = $machineNote
	}

	$link = [ordered]@{
		pcassetnumber = $AssetNumber; machineassetnumber = $machine.machinenumber; relationship = 'controls'
		dnctype = $machine.dnctype; controltype = $machine.controltype; controllervendor = $controllerVendor
		site = $machine.site; source = $machine.source; collectedat = $collectedAt
		connection = [ordered]@{
			transport = $transport; tcpaddress = $machine.tcpaddress; tcpport = $machine.tcpport
			comport = $machine.comport; baudrate = $machine.baudrate
		}
	}
	Write-Utf8NoBom -Path (Join-Path $sidecarDir ('machine_' + $machine.machinenumber + '.json')) -Content ($link | ConvertTo-Json -Depth 6)
	Write-Host ('  linked machine ' + $machine.machinenumber + ' (' + $controllerVendor + ', ' + $transport + ')') -ForegroundColor DarkGray
} elseif (-not $SkipMachine) {
	Write-Host '  no eDNC/DNC/UDC machine config found on this PC' -ForegroundColor DarkGray
}

# --- Upsert into the shared store --------------------------------------------

$rowsByStore = @{
	'vendors.csv'          = $vendorRows
	'models.csv'           = $modelRows
	'operatingsystems.csv' = $osRows
	'assets.csv'           = $assetRows
	'computers.csv'        = $computerRows
	'machines.csv'         = $machineRows
}

Write-Host ''
Write-Host ('  Store: ' + $OutputRoot) -ForegroundColor Green
foreach ($fileName in $script:Stores.Keys) {
	$spec = $script:Stores[$fileName]
	$rows = @($rowsByStore[$fileName])
	if ($rows.Count -eq 0) { continue }
	$path = Join-Path $OutputRoot $fileName
	$n = Merge-CsvStore -Path $path -Header $spec.header -Key $spec.key -IncomingRows $rows
	Write-Host ('  merged ' + $n + ' row(s) into ' + $fileName) -ForegroundColor DarkGray
}

# PC phase-2 sidecar.
$pcSidecar = [ordered]@{
	assetnumber = $AssetNumber; hostname = $pc.hostname; collectedat = $collectedAt
	interfaces = $pc.interfaces; installedapps = $pc.installedapps
}
Write-Utf8NoBom -Path (Join-Path $sidecarDir ('computer_' + $AssetNumber + '.json')) -Content ($pcSidecar | ConvertTo-Json -Depth 6)

# --- Publish (standard-user network mirror, optional) -------------------------

if ($PublishRoot) {
	if (([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(
			[Security.Principal.WindowsBuiltInRole]::Administrator)) {
		Write-Host ''
		Write-Host '  WARNING: publishing while elevated. Network writes should run as the standard user.' -ForegroundColor Yellow
	}
	if (-not (Test-Path -LiteralPath $PublishRoot)) { New-Item -ItemType Directory -Path $PublishRoot -Force | Out-Null }

	# Merge THIS PC's rows into the shared store rather than overwriting it. A
	# blind copy would erase every other PC's rows (issue: the store is meant to
	# accumulate site-wide). Merge-CsvStore upserts field-by-field, so a second
	# PC's run adds its rows and refreshes shared ones without dropping the rest.
	# A lock file serializes concurrent publishers so two PCs cannot read-modify-
	# write the same store CSV at once and lose each other's rows.
	$lockPath = Join-Path $PublishRoot '.publish.lock'
	$lockStream = $null
	for ($attempt = 0; $attempt -lt 60; $attempt++) {
		try {
			$lockStream = [System.IO.File]::Open(
				$lockPath, [System.IO.FileMode]::OpenOrCreate,
				[System.IO.FileAccess]::ReadWrite, [System.IO.FileShare]::None)
			break
		} catch {
			Start-Sleep -Milliseconds 500
		}
	}
	if ($null -eq $lockStream) {
		Write-Host ''
		Write-Host ('  WARNING: could not acquire publish lock at ' + $lockPath + '; skipping network merge.') -ForegroundColor Yellow
	} else {
		try {
			foreach ($fileName in $script:Stores.Keys) {
				$spec = $script:Stores[$fileName]
				$localPath = Join-Path $OutputRoot $fileName
				if (-not (Test-Path -LiteralPath $localPath)) { continue }
				$localRows = @(Import-Csv -LiteralPath $localPath)
				if ($localRows.Count -eq 0) { continue }
				$sharePath = Join-Path $PublishRoot $fileName
				$n = Merge-CsvStore -Path $sharePath -Header $spec.header -Key $spec.key -IncomingRows $localRows
				Write-Host ('  merged ' + $n + ' row(s) into ' + $fileName + ' on share') -ForegroundColor DarkGray
			}

			# Sidecars are uniquely named per asset, so a straight copy is safe and
			# nothing is overwritten across PCs.
			$localSidecars = Join-Path $OutputRoot 'sidecars'
			if (Test-Path -LiteralPath $localSidecars) {
				$shareSidecars = Join-Path $PublishRoot 'sidecars'
				if (-not (Test-Path -LiteralPath $shareSidecars)) { New-Item -ItemType Directory -Path $shareSidecars -Force | Out-Null }
				Copy-Item -Path (Join-Path $localSidecars '*') -Destination $shareSidecars -Recurse -Force
			}
		} finally {
			$lockStream.Close()
			$lockStream.Dispose()
			Remove-Item -LiteralPath $lockPath -Force -ErrorAction SilentlyContinue
		}
		Write-Host ''
		Write-Host ('  Published store to: ' + $PublishRoot) -ForegroundColor Green
	}
}

Write-Host ''
Write-Host '  Done. Dry-run validate the accumulated store with:' -ForegroundColor Cyan
Write-Host ('    flask csv import --dir "' + $OutputRoot + '"') -ForegroundColor White
Write-Host ''