$ErrorActionPreference = "Stop"

$requiredFiles = @(
  "backend/package.json",
  "backend/package-lock.json",
  "backend/tsconfig.json",
  "backend/.env.example",
  "backend/src/app.ts",
  "backend/src/config.ts",
  "backend/src/routes/health.ts",
  "backend/src/server.ts",
  "backend/tests/backend-contract.test.mjs",
  "deploy/pm2/ecosystem.config.cjs"
)

foreach ($path in $requiredFiles) {
  if (-not (Test-Path $path)) {
    throw "Required backend file missing: $path"
  }
}

& npm --prefix backend test
if ($LASTEXITCODE -ne 0) {
  throw "backend contract test failed"
}

& npm --prefix backend run build
if ($LASTEXITCODE -ne 0) {
  throw "backend build failed"
}

$oldHost = $env:QIPAI_API_HOST
$oldPort = $env:QIPAI_API_PORT
$oldVersion = $env:QIPAI_API_VERSION
$env:QIPAI_API_HOST = "127.0.0.1"
$env:QIPAI_API_PORT = "3101"
$env:QIPAI_API_VERSION = "0.1.0-test"

$server = $null
try {
  $server = Start-Process -FilePath node -ArgumentList "dist/server.js" -WorkingDirectory "backend" -PassThru -WindowStyle Hidden
  $appHealth = $null
  $adminHealth = $null

  for ($attempt = 0; $attempt -lt 20; $attempt++) {
    try {
      $appHealth = Invoke-RestMethod -Uri "http://127.0.0.1:3101/app-api/health" -Headers @{ "x-trace-id" = "codex-health-app" }
      $adminHealth = Invoke-RestMethod -Uri "http://127.0.0.1:3101/admin-api/health" -Headers @{ "x-trace-id" = "codex-health-admin" }
      break
    } catch {
      if ($server.HasExited) {
        throw "backend server exited before health checks completed"
      }
      Start-Sleep -Milliseconds 500
    }
  }

  if (-not $appHealth -or -not $adminHealth) {
    throw "backend health checks did not respond"
  }
  if (-not $appHealth.ok -or $appHealth.service -ne "qipai-api" -or $appHealth.traceId -ne "codex-health-app") {
    throw "app health response mismatch"
  }
  if (-not $adminHealth.ok -or $adminHealth.service -ne "qipai-api" -or $adminHealth.traceId -ne "codex-health-admin") {
    throw "admin health response mismatch"
  }
} finally {
  if ($server -and -not $server.HasExited) {
    Stop-Process -Id $server.Id -Force
  }
  $env:QIPAI_API_HOST = $oldHost
  $env:QIPAI_API_PORT = $oldPort
  $env:QIPAI_API_VERSION = $oldVersion
}

Write-Host "PASS: backend M01-A build and HTTP health checks passed."