/** 语句：echo 打印信息（写入 log + UI）；统一结点报错打印逻辑 */
const types = ['echo']

/**
 * 统一打印结点报错：写入 log.txt 并可选通知 UI。所有结点失败时均由此处输出，无需在各结点内单独 logMessage。
 * @param {object} action - 当前执行的 action
 * @param {{ success: boolean, error?: string }} result - 执行结果（success 为 false 时应有 error）
 * @param {{ getActionName: function, logMessage: function, folderPath: string }} ctx - 上下文
 */
async function logActionError(action, result, ctx) {
  if (result && result.success) return
  const { getActionName, logMessage, folderPath } = ctx
  const now = new Date()
  const timeStr = `${now.getFullYear()}/${String(now.getMonth() + 1).padStart(2, '0')}/${String(now.getDate()).padStart(2, '0')} ${String(now.getHours()).padStart(2, '0')}:${String(now.getMinutes()).padStart(2, '0')}:${String(now.getSeconds()).padStart(2, '0')}`
  const errDetail = result && result.error != null && String(result.error).trim() !== '' ? String(result.error) : 'unknown'
  const actionName = typeof getActionName === 'function' ? getActionName(action) : (action && action.type) || 'unknown'
  const errorMsg = `[sequence-runner] [ERROR] ${actionName} failed: ${errDetail} [time: ${timeStr}]`
  await logMessage(errorMsg, folderPath).catch(() => {})
  if (typeof window !== 'undefined') {
    try {
      window.dispatchEvent(new CustomEvent('log-message', { detail: { message: errorMsg, isError: true } }))
    } catch (_) {}
  }
}

function parse(action, parseContext) {
  const { extractVarName } = parseContext
  const parsed = { type: 'echo' }
  if (action.inVars && Array.isArray(action.inVars)) {
    parsed.inVars = action.inVars.map(v => extractVarName(v))
  } else parsed.inVars = []
  if (action.value) parsed.value = action.value
  return Object.assign({}, action, parsed)
}

async function execute(action, ctx) {
  const { folderPath, variableContext, replaceVariablesInString, logMessage } = ctx
  let message = ''
  if (action.inVars && action.inVars.length > 0) {
    message = action.inVars.map((v) => (v != null ? String(v) : '')).join(' ')
  } else if (action.value) {
    message = replaceVariablesInString(action.value, variableContext)
    const doubleBracePattern = /\{\{([\w-]+)\}\}/g
    let match
    const variablesInValue = []
    while ((match = doubleBracePattern.exec(action.value)) !== null) variablesInValue.push(match[1])
    if (!message || message === action.value) {
      const missingVars = variablesInValue.filter(vn => {
        const v = variableContext[vn]
        return v === undefined || v === null || v === ''
      })
      if (missingVars.length > 0) message = `${action.value} [vars undefined or empty: ${missingVars.join(', ')}]`
    }
  }
  const now = new Date()
  const timeStr = `${now.getFullYear()}/${String(now.getMonth() + 1).padStart(2, '0')}/${String(now.getDate()).padStart(2, '0')} ${String(now.getHours()).padStart(2, '0')}:${String(now.getMinutes()).padStart(2, '0')}:${String(now.getSeconds()).padStart(2, '0')}`
  const messageWithTime = message ? `[echo] ${message} [time: ${timeStr}]` : `[echo] [empty message] [time: ${timeStr}]`
  await logMessage(messageWithTime, folderPath)
  if (typeof window !== 'undefined') {
    const logEvent = new CustomEvent('log-message', { detail: { message } })
    window.dispatchEvent(logEvent)
  }
  return { success: true }
}

module.exports = { types, parse, execute, logActionError }