# Package nl-pms-api for desktop "package" task.
# Rebuilds only when sources change; pass -Force to always rebuild.
# Output: view/bin/nl-pms-api/ (linux/amd64 binary + init.sql + migrations + config.example.yaml)

param(
  [switch]$Force
)

$ErrorActionPreference = 'Stop'
$ViewRoot = Split-Path -Parent $PSScriptRoot
$ApiRoot = Join-Path (Split-Path -Parent $ViewRoot) 'nl-pms-api'
$OutDir = Join-Path $ViewRoot 'bin\nl-pms-api'
$StampFile = Join-Path $OutDir '.stamp'
$BinPath = Join-Path $OutDir 'nl-pms-api'

if (-not (Test-Path $ApiRoot)) {
  Write-Error "API dir not found: $ApiRoot (expected sibling of view)"
}

function Get-ApiFingerprint {
  $files = @()
  $files += Get-ChildItem -Path $ApiRoot -Filter 'go.mod' -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path $ApiRoot -Filter 'go.sum' -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path $ApiRoot -Filter 'main.go' -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path $ApiRoot -Filter 'init.sql' -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path $ApiRoot -Filter 'config.example.yaml' -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path (Join-Path $ApiRoot 'internal') -Recurse -Include *.go -File -ErrorAction SilentlyContinue
  $files += Get-ChildItem -Path (Join-Path $ApiRoot 'migrations') -Recurse -Include *.sql -File -ErrorAction SilentlyContinue
  $sha = [System.Security.Cryptography.SHA256]::Create()
  $ms = New-Object System.IO.MemoryStream
  foreach ($f in ($files | Sort-Object FullName)) {
    $rel = $f.FullName.Substring($ApiRoot.Length).TrimStart('\', '/')
    $bytes = [System.Text.Encoding]::UTF8.GetBytes($rel + "`n")
    $ms.Write($bytes, 0, $bytes.Length)
    $content = [System.IO.File]::ReadAllBytes($f.FullName)
    $ms.Write($content, 0, $content.Length)
  }
  $hash = $sha.ComputeHash($ms.ToArray())
  ($hash | ForEach-Object { $_.ToString('x2') }) -join ''
}

$fp = Get-ApiFingerprint
$prev = ''
if (Test-Path $StampFile) { $prev = (Get-Content -Raw $StampFile).Trim() }

if (-not $Force -and $prev -eq $fp -and (Test-Path $BinPath)) {
  Write-Host "api: up to date ($fp)"
  exit 0
}

Write-Host "api: packaging -> $OutDir"
New-Item -ItemType Directory -Force -Path $OutDir | Out-Null
$migOut = Join-Path $OutDir 'migrations'
New-Item -ItemType Directory -Force -Path $migOut | Out-Null

$prevGoos = $env:GOOS
$prevGoarch = $env:GOARCH
$prevCgo = $env:CGO_ENABLED
$env:CGO_ENABLED = '0'
$env:GOOS = 'linux'
$env:GOARCH = 'amd64'
Push-Location $ApiRoot
try {
  & go build -trimpath -ldflags '-s -w' -o $BinPath .
  if ($LASTEXITCODE -ne 0) { throw "go build failed: $LASTEXITCODE" }
} finally {
  Pop-Location
  if ($null -eq $prevGoos) { Remove-Item Env:GOOS -ErrorAction SilentlyContinue } else { $env:GOOS = $prevGoos }
  if ($null -eq $prevGoarch) { Remove-Item Env:GOARCH -ErrorAction SilentlyContinue } else { $env:GOARCH = $prevGoarch }
  if ($null -eq $prevCgo) { Remove-Item Env:CGO_ENABLED -ErrorAction SilentlyContinue } else { $env:CGO_ENABLED = $prevCgo }
}

Copy-Item -Force (Join-Path $ApiRoot 'init.sql') (Join-Path $OutDir 'init.sql')
Copy-Item -Force (Join-Path $ApiRoot 'config.example.yaml') (Join-Path $OutDir 'config.example.yaml')
Get-ChildItem -Path (Join-Path $ApiRoot 'migrations') -Filter '*.sql' -File -ErrorAction SilentlyContinue |
  ForEach-Object { Copy-Item -Force $_.FullName (Join-Path $migOut $_.Name) }

# Must be linux ELF (not Windows PE). Magic: 7F 45 4C 46
$hdr = Get-Content -Path $BinPath -Encoding Byte -TotalCount 4
if ($hdr.Count -lt 4 -or $hdr[0] -ne 0x7F -or $hdr[1] -ne 0x45 -or $hdr[2] -ne 0x4C -or $hdr[3] -ne 0x46) {
  Remove-Item -Force $BinPath -ErrorAction SilentlyContinue
  throw "api binary is not linux ELF (GOOS=linux GOARCH=amd64 required). Got header: $($hdr -join ',')"
}

Set-Content -Path $StampFile -Value $fp -NoNewline
Write-Host "api: done linux/amd64 ELF -> $BinPath"