/**
 * Host-side booter diagnostics (runs before guest VFS exists).
 * Avoids raw console.warn as the only sink; supports suppression and NDJSON file append.
 *
 * Env:
 * - BARE_OS_HOST_BOOTER_LOG — `stderr` (default), `0`/`false`/`off` (silent), `ndjson` (append file)
 * - BARE_OS_HOST_BOOTER_LOG_PATH — override path when mode is `ndjson` (default: ~/.bare-os/var/log/booter-host.ndjson)
 */
import fs from '#host-fs'
import path from '#host-path'

function hostDataRoot() {
  const override =
    globalThis.process?.env && globalThis.process.env.BARE_OS_HOST_DATA
  if (override) return path.resolve(String(override))
  const home =
    (globalThis.process?.env && globalThis.process.env.HOME) || '/tmp'
  return path.join(String(home), '.bare-os')
}

function defaultNdjsonPath() {
  return path.join(hostDataRoot(), 'var', 'log', 'booter-host.ndjson')
}

/**
 * @param {string} code Stable machine-readable code (e.g. ctx_bare_load_failed).
 * @param {string} human Human-readable message (no secrets).
 * @param {string} [detail] Optional short detail (error.message, etc.).
 */
/**
 * Host-side informational line (boot trace off): stderr when mode is stderr; optional NDJSON append.
 * @param {string} code
 * @param {string} human
 * @param {string} [detail]
 */
export function bareOsHostBooterInfo(code, human, detail) {
  const env = globalThis.process?.env || {}
  const mode = String(env.BARE_OS_HOST_BOOTER_LOG || 'stderr')
    .trim()
    .toLowerCase()
  if (
    mode === '0' ||
    mode === 'false' ||
    mode === 'off' ||
    mode === 'no' ||
    mode === 'silent'
  ) {
    return
  }

  const d = detail != null ? String(detail).slice(0, 4000) : ''
  const line = `[bare-os-booter][${code}] ${human}${d ? `: ${d}` : ''}`

  if (mode === 'ndjson') {
    const logPath = String(env.BARE_OS_HOST_BOOTER_LOG_PATH || '').trim() || defaultNdjsonPath()
    try {
      fs.mkdirSync(path.dirname(logPath), { recursive: true })
      fs.appendFileSync(
        logPath,
        `${JSON.stringify({
          type: 'booterHostInfo',
          code: String(code).slice(0, 128),
          message: String(human).slice(0, 2000),
          detail: d || undefined,
          ts: Date.now()
        })}\n`,
        'utf8'
      )
    } catch {
      /* fall through */
    }
  }

  if (mode === 'ndjson' && env.BARE_OS_HOST_BOOTER_LOG_STDERR !== '1') {
    return
  }

  const err = globalThis.process?.stderr
  if (err && typeof err.write === 'function') {
    err.write(`${line}\n`)
  } else if (typeof console.info === 'function') {
    console.info(line)
  }
}

export function bareOsHostBooterWarn(code, human, detail) {
  const env = globalThis.process?.env || {}
  const mode = String(env.BARE_OS_HOST_BOOTER_LOG || 'stderr')
    .trim()
    .toLowerCase()
  if (
    mode === '0' ||
    mode === 'false' ||
    mode === 'off' ||
    mode === 'no' ||
    mode === 'silent'
  ) {
    return
  }

  const d = detail != null ? String(detail).slice(0, 4000) : ''
  const line = `[bare-os-booter][${code}] ${human}${d ? `: ${d}` : ''}`

  if (mode === 'ndjson') {
    const logPath = String(env.BARE_OS_HOST_BOOTER_LOG_PATH || '').trim() || defaultNdjsonPath()
    try {
      fs.mkdirSync(path.dirname(logPath), { recursive: true })
      fs.appendFileSync(
        logPath,
        `${JSON.stringify({
          type: 'booterHostWarn',
          code: String(code).slice(0, 128),
          message: String(human).slice(0, 2000),
          detail: d || undefined,
          ts: Date.now()
        })}\n`,
        'utf8'
      )
    } catch {
      /* fall through to stderr */
    }
  }

  if (mode === 'ndjson' && env.BARE_OS_HOST_BOOTER_LOG_STDERR !== '1') {
    return
  }

  if (typeof console !== 'undefined' && typeof console.warn === 'function') {
    console.warn(line)
  }
}