# Vendor-side tool. Builds a signed offline update package that customers can
# apply from a USB drive or local folder without any internet access.
#
# The package layout is:
#   <OutputDir>\
#     update-manifest.json        signed manifest (product, version, file hashes)
#     update-manifest.json.sig    RSA SHA-256 signature
#     payload\<relative paths>    the actual replacement files
#
# Example:
#   .\Create-UpdatePackage.ps1 -Version "v16" -Files "bin\jackailocald.exe","webui\app-v15.js" -OutputDir "E:\update-v16"
[CmdletBinding()]
param(
  [Parameter(Mandatory=$true)][string]$Version,
  [Parameter(Mandatory=$true)][string[]]$Files,
  [Parameter(Mandatory=$true)][string]$OutputDir,
  [string]$SourceRoot = "",
  [string]$Channel = "stable",
  [string]$PrivateKeyXmlPath = ""
)
$ErrorActionPreference = "Stop"

$scriptRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
if (-not $SourceRoot) { $SourceRoot = (Resolve-Path (Join-Path $scriptRoot "..")).Path }
$SourceRoot = (Resolve-Path $SourceRoot).Path

New-Item -ItemType Directory -Force -Path $OutputDir | Out-Null
$payloadDir = Join-Path $OutputDir "payload"
New-Item -ItemType Directory -Force -Path $payloadDir | Out-Null

$entries = @()
foreach ($relative in $Files) {
  $source = Join-Path $SourceRoot $relative
  if (!(Test-Path $source -PathType Leaf)) { throw "Update file not found in source root: $source" }
  $dest = Join-Path $payloadDir $relative
  New-Item -ItemType Directory -Force -Path (Split-Path $dest) | Out-Null
  Copy-Item $source $dest -Force
  $hash = (Get-FileHash -Algorithm SHA256 $dest).Hash.ToLowerInvariant()
  $entries += [pscustomobject]@{
    path   = ($relative -replace "\\", "/")
    sha256 = $hash
  }
}

$manifest = [pscustomobject]@{
  product = "JackAILocal"
  version = $Version
  channel = $Channel
  created = (Get-Date).ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ")
  files   = $entries
}
$manifestPath = Join-Path $OutputDir "update-manifest.json"
$manifest | ConvertTo-Json -Depth 5 | Set-Content -Encoding utf8 $manifestPath

$signArgs = @{ ManifestPath = $manifestPath }
if ($PrivateKeyXmlPath) { $signArgs.PrivateKeyXmlPath = $PrivateKeyXmlPath }
& (Join-Path $scriptRoot "Sign-Manifest.ps1") @signArgs

Write-Host ""
Write-Host "Offline update package created: $OutputDir" -ForegroundColor Green
Write-Host "Ship the whole folder (manifest + .sig + payload) to the customer."
Write-Host "The customer applies it with: updates\JackAILocal-Update-Offline.ps1 -PackagePath <folder> -Apply"