/**
 * Seeder / host script logging: levels + optional NDJSON lines on stderr for tooling.
 * Avoids scattering raw console.log without structure.
 */

/**
 * @param {Record<string, string | undefined> | null | undefined} env
 */
function wantJson(env) {
  const v = String(env?.BARE_OS_SEED_LOG_FORMAT ?? '').trim().toLowerCase()
  return v === 'json' || v === 'ndjson'
}

/**
 * @param {Record<string, unknown> | undefined} detail
 */
function formatDetailForText(detail) {
  if (!detail || typeof detail !== 'object') return ''
  const parts = []
  for (const [k, v] of Object.entries(detail)) {
    if (v === undefined) continue
    const s =
      v !== null && typeof v === 'object'
        ? JSON.stringify(v)
        : String(v)
    parts.push(`${k}=${s}`)
  }
  return parts.length ? ` — ${parts.join(', ')}` : ''
}

/**
 * @param {'info'|'warn'|'error'} level
 * @param {string} message
 * @param {Record<string, unknown>} [detail]
 */
export function seedLog(level, message, detail = undefined) {
  const env = globalThis.process?.env
  const err = globalThis.process?.stderr
  if (wantJson(env) && err && typeof err.write === 'function') {
    err.write(
      `${JSON.stringify({
        type: 'bare_os_seeder',
        level,
        message: String(message),
        detail: detail && typeof detail === 'object' ? detail : undefined,
        ts: Date.now()
      })}\n`
    )
    return
  }
  const line =
    `[bare-os-seeder] ${level}: ${message}` +
    formatDetailForText(detail)
  if (level === 'error') {
    if (typeof console.error === 'function') console.error(line)
    else if (err && typeof err.write === 'function') err.write(`${line}\n`)
    return
  }
  if (level === 'warn') {
    if (typeof console.warn === 'function') console.warn(line)
    else if (err && typeof err.write === 'function') err.write(`${line}\n`)
    return
  }
  if (typeof console.log === 'function') console.log(line)
  else if (err && typeof err.write === 'function') err.write(`${line}\n`)
}