/**
 * 语句：set 设置变量 + 变量与值解析（原 value-resolver：extractVarName、replaceVariablesInString、resolveValue、parseValue、时间/延迟）
 */
const types = ['set']

function extractVarName(varName) {
  if (typeof varName === 'string' && varName.startsWith('{') && varName.endsWith('}')) {
    return varName.slice(1, -1)
  }
  return varName
}

function replaceVariablesInString(str, context) {
  if (typeof str !== 'string') return str
  const doubleBracePattern = /\{\{([\w-]+)\}\}/g
  return str.replace(doubleBracePattern, (match, varName) => {
    const varValue = context[varName]
    if (varValue === undefined || varValue === null || varValue === '') return ''
    if (varValue === 'undefined' || varValue === 'null') return ''
    if (typeof varValue === 'string') {
      try {
        const parsed = JSON.parse(varValue)
        if (Array.isArray(parsed)) return parsed.length === 0 ? '' : varValue
      } catch (e) {}
    }
    if (Array.isArray(varValue) || (typeof varValue === 'object' && varValue !== null)) {
      try {
        return JSON.stringify(varValue)
      } catch (e) {
        return String(varValue)
      }
    }
    return String(varValue)
  })
}

function resolveValue(value, context) {
  if (typeof value === 'string' && value.startsWith('{') && value.endsWith('}')) {
    const varName = value.slice(1, -1)
    return context[varName] !== undefined ? context[varName] : value
  }
  if (Array.isArray(value)) {
    return value.map(item => resolveValue(item, context))
  }
  if (typeof value === 'object' && value !== null) {
    const resolved = {}
    for (const key in value) {
      resolved[key] = resolveValue(value[key], context)
    }
    return resolved
  }
  return value
}

function parseTimeString(timeStr) {
  if (!timeStr || typeof timeStr !== 'string' || timeStr.trim() === '') return null
  try {
    const parts = timeStr.trim().split(' ')
    if (parts.length !== 2) return null
    const datePart = parts[0].split('/')
    const timePart = parts[1].split(':')
    if (datePart.length !== 3 || timePart.length !== 2) return null
    const date = new Date(
      parseInt(datePart[0], 10),
      parseInt(datePart[1], 10) - 1,
      parseInt(datePart[2], 10),
      parseInt(timePart[0], 10),
      parseInt(timePart[1], 10),
      0, 0
    )
    return isNaN(date.getTime()) ? null : date
  } catch (e) {
    return null
  }
}

function parseDelayString(delayStr) {
  if (!delayStr || typeof delayStr !== 'string' || delayStr.trim() === '') return 0
  try {
    const trimmed = delayStr.trim()
    const unit = trimmed.slice(-1).toLowerCase()
    const value = parseInt(trimmed.slice(0, -1), 10)
    if (isNaN(value) || value < 0) return null
    switch (unit) {
      case 's': return value * 1000
      case 'm': return value * 60 * 1000
      case 'h': return value * 60 * 60 * 1000
      default: return null
    }
  } catch (e) {
    return null
  }
}

function calculateWaitTime(data, delay) {
  return 0
}

function parseValue(str) {
  if (typeof str !== 'string') return str
  str = str.trim()
  if (str === 'true') return true
  if (str === 'false') return false
  if ((str.startsWith('"') && str.endsWith('"')) || (str.startsWith("'") && str.endsWith("'"))) {
    return str.slice(1, -1).replace(/\\"/g, '"').replace(/\\'/g, "'")
  }
  if (/^-?\d+(\.\d+)?$/.test(str)) return parseFloat(str)
  if (str === 'undefined') return undefined
  return str
}

function parse(action, parseContext) {
  const variableContext = parseContext.variableContext || {}
  const parsed = {
    type: 'set',
    variable: action.variable,
    value: resolveValue(action.value, variableContext),
  }
  return Object.assign({}, action, parsed)
}

async function execute(action, ctx) {
  const { variableContext, evaluateExpression } = ctx
  if (!action.variable) return { success: true }
  const varName = extractVarName(action.variable)
  let finalValue = action.value
  if (typeof action.value === 'string' && /[+\-*/]/.test(action.value)) {
    finalValue = evaluateExpression(action.value, variableContext)
  } else if (typeof action.value === 'string') {
    const varPattern = /\{([\w-]+)\}/g
    let hasVariables = false
    finalValue = action.value.replace(varPattern, (match, vn) => {
      hasVariables = true
      const val = variableContext[vn]
      return val === undefined || val === null ? match : String(val)
    })
    if (!hasVariables) finalValue = resolveValue(action.value, variableContext)
  } else {
    finalValue = resolveValue(action.value, variableContext)
  }
  variableContext[varName] = finalValue
  return { success: true }
}

module.exports = {
  types,
  parse,
  execute,
  extractVarName,
  replaceVariablesInString,
  resolveValue,
  parseTimeString,
  parseDelayString,
  calculateWaitTime,
  parseValue,
}