/**
 * E2E-only backend: temp SQLite, configurable port/root. Used by Playwright webServer.
 */
import { spawn } from 'node:child_process'
import { existsSync, mkdtempSync, rmSync, mkdirSync, writeFileSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join, dirname, resolve } from 'node:path'
import { fileURLToPath } from 'node:url'

const scriptDir = dirname(fileURLToPath(import.meta.url))
const frontendRoot = join(scriptDir, '..')
const defaultBackend = join(frontendRoot, '..', 'backend-nest')
const backendRoot = resolve(process.env.E2E_BACKEND_ROOT ?? defaultBackend)
const backendPort = String(process.env.E2E_BACKEND_PORT ?? '3010')
const frontendPort = String(process.env.E2E_FRONTEND_PORT ?? '5190')
const corsOrigin = process.env.E2E_CORS_ORIGIN ?? `http://127.0.0.1:${frontendPort}`

const distMain = join(backendRoot, 'dist', 'main.js')
if (!existsSync(distMain)) {
  console.error(`Missing ${distMain}. Run: npm run e2e:prepare (or npm run build in backend).`)
  process.exit(1)
}

const runtimeDir = join(frontendRoot, 'e2e', '.runtime')
mkdirSync(runtimeDir, { recursive: true })

const tempDir = mkdtempSync(join(tmpdir(), 'cgl-e2e-'))
const dbPath = join(tempDir, 'app.db')
writeFileSync(
  join(runtimeDir, 'state.json'),
  JSON.stringify({ tempDir, dbPath, backendPort: Number(backendPort) }),
  'utf8',
)

const backend = spawn(process.execPath, ['dist/main.js'], {
  cwd: backendRoot,
  env: {
    ...process.env,
    PORT: backendPort,
    DB_PATH: dbPath,
    CORS_ORIGIN: corsOrigin,
    JWT_SECRET: process.env.E2E_JWT_SECRET ?? 'e2e-ci-jwt-not-for-production',
    NODE_ENV: 'test',
  },
  stdio: 'inherit',
})

function cleanupTemp() {
  try {
    backend.kill()
  } catch {
    // ignore
  }
  try {
    rmSync(tempDir, { recursive: true, force: true })
  } catch {
    // ignore
  }
}

function shutdown(code = 0) {
  cleanupTemp()
  process.exit(code)
}

process.on('SIGINT', () => shutdown(0))
process.on('SIGTERM', () => shutdown(0))
backend.on('exit', (code, signal) => {
  if (signal) shutdown(0)
  else process.exit(code ?? 1)
})