/** 语句：echo 打印信息（写入 log + UI） */
const types = ['echo']

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, extractVarName, replaceVariablesInString, logMessage } = ctx
  let message = ''
  if (action.inVars && action.inVars.length > 0) {
    const messages = action.inVars.map(varWithBraces => {
      const varName = extractVarName(varWithBraces)
      const varValue = variableContext[varName]
      if (varWithBraces.startsWith('{') && varWithBraces.endsWith('}')) {
        return varValue !== undefined ? String(varValue) : varWithBraces
      }
      return varWithBraces
    })
    message = messages.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} [变量未定义或为空: ${missingVars.join(', ')}]`
    }
  }
  const now = new Date()
  const timeStr = `${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')}:${String(now.getSeconds()).padStart(2, '0')}`
  const messageWithTime = message ? `${message} [系统时间: ${timeStr}]` : `[空消息] [系统时间: ${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 }