/**
 * Append-only local audit log for privileged RPC actions.
 *
 * Path: PEARDOCK_AUDIT_LOG (default: ./peardock-audit.log)
 * Set PEARDOCK_AUDIT=0 to disable.
 */
import fs from 'fs'
import path from 'path'
import logger from '../utils/logger.js'

const ENABLED = process.env.PEARDOCK_AUDIT !== '0'
const LOG_PATH = process.env.PEARDOCK_AUDIT_LOG || path.join(process.cwd(), 'peardock-audit.log')

/** Methods that should always be audited when successful/attempted. */
const AUDIT_METHODS = new Set([
  'removeContainer',
  'killContainer',
  'pruneContainers',
  'pruneImages',
  'pruneNetworks',
  'pruneVolumes',
  'pruneBuilder',
  'systemPrune',
  'recreateContainer',
  'upsertSchedule',
  'deleteSchedule',
  'removeImage',
  'removeStack',
  'deployStack',
  'syncStackFromGit',
  'deployContainer',
  'createTunnel',
  'closeTunnel',
  'createContainer',
  'buildImage',
  'pushImage',
  'loadImageFinish',
  'importImage',
  'registryLogin',
  'registryLogout',
  'vaultStoreCredential',
  'vaultDeleteCredential',
  'vaultUseCredential',
  'vaultTestCredential',
  'invitePeer',
  'deleteInvite',
  'revokePeer',
  'unrevokePeer',
  'clearRevokedPeers',
  'setPeerRole',
  'archiveContainerPut',
  'removeNetwork',
  'removeVolume',
  'updateContainer',
  'duplicateContainer',
  'commitContainer',
  'swarmInit',
  'swarmLeave',
  'createService',
  'removeService',
  'createSecret',
  'removeSecret',
  'installPlugin',
  'removePlugin',
])

/**
 * @param {object} entry
 * @param {string} entry.method
 * @param {string} [entry.peerId]
 * @param {string} [entry.role]
 * @param {boolean} [entry.ok]
 * @param {string} [entry.error]
 * @param {object} [entry.args]
 */
export function audit(entry) {
  if (!ENABLED) return
  if (!entry?.method) return
  if (!AUDIT_METHODS.has(entry.method) && entry.force !== true) return

  const line = JSON.stringify({
    ts: new Date().toISOString(),
    method: entry.method,
    peerId: entry.peerId ? String(entry.peerId).slice(0, 16) : null,
    role: entry.role || null,
    ok: entry.ok !== false,
    error: entry.error || null,
    // Never log secrets; only allowlisted arg keys
    args: sanitizeArgs(entry.args),
  })

  try {
    fs.appendFileSync(LOG_PATH, line + '\n', { encoding: 'utf8' })
  } catch (err) {
    logger.warn('audit log write failed', { error: err.message })
  }
}

/**
 * @param {unknown} args
 */
function sanitizeArgs(args) {
  if (!args || typeof args !== 'object') return null
  const out = {}
  const keys = [
    'id',
    'name',
    'stackName',
    'image',
    'operation',
    'path',
    'term',
    'containerIds',
    'authMode',
    'role',
  ]
  for (const k of keys) {
    if (args[k] != null) {
      if (k === 'containerIds' && Array.isArray(args[k])) {
        out[k] = args[k].slice(0, 20).map((x) => String(x).slice(0, 12))
      } else {
        out[k] = String(args[k]).slice(0, 128)
      }
    }
  }
  return Object.keys(out).length ? out : null
}

export function shouldAudit(method) {
  return ENABLED && AUDIT_METHODS.has(method)
}

export { AUDIT_METHODS, LOG_PATH }