/**
 * 工作流结点严格格式：除各 type 专有字段外，仅允许下列可选流程字段。
 */
const FLOW_OPTIONAL_KEYS = new Set([
  'condition',
  'delay',
  'times',
  'timeout',
  'retry',
  'data',
  'model',
])

/**
 * @param {object} action
 * @param {string[]} baseKeys - 允许的专有字段（须含 type）
 * @param {string} path - 如 execute[0]
 */
function assertStrictKeys (action, baseKeys, path) {
  if (!action || typeof action !== 'object') return
  const allowed = new Set(baseKeys)
  FLOW_OPTIONAL_KEYS.forEach((k) => allowed.add(k))
  const extra = Object.keys(action).filter((k) => !allowed.has(k))
  if (extra.length > 0) {
    throw new Error(
      `${path}: 不允许的字段: ${extra.sort().join(', ')}。允许: ${[...allowed].sort().join(', ')}`,
    )
  }
}

module.exports = { FLOW_OPTIONAL_KEYS, assertStrictKeys }