/** 语句：random 生成随机数 */
const types = ['random']

function parse(action, parseContext) {
  const { extractVarName } = parseContext
  const parsed = { type: 'random', integer: action.integer !== undefined ? action.integer : true }
  if (action.inVars && Array.isArray(action.inVars) && action.inVars.length >= 2) {
    parsed.min = action.inVars[0]
    parsed.max = action.inVars[1]
  } else {
    parsed.min = action.min
    parsed.max = action.max
  }
  if (action.outVars && Array.isArray(action.outVars) && action.outVars.length > 0) {
    parsed.variable = action.outVars[0]
  } else parsed.variable = action.variable
  return Object.assign({}, action, parsed)
}

async function execute(action, ctx) {
  const { variableContext, extractVarName } = ctx
  let varName
  if (action.outVars && action.outVars.length > 0) {
    varName = extractVarName(action.outVars[0])
  } else if (action.variable) {
    varName = extractVarName(action.variable)
  } else {
    return { success: false, error: 'random 操作缺少 variable 或 outVars 参数' }
  }
  let min, max
  if (action.inVars && action.inVars.length >= 2) {
    min = Number(action.inVars[0])
    max = Number(action.inVars[1])
  } else {
    min = action.min !== undefined ? Number(action.min) : 0
    max = action.max !== undefined ? Number(action.max) : 100
  }
  const integer = action.integer !== undefined ? action.integer : true
  if (isNaN(min) || isNaN(max)) return { success: false, error: 'random 操作的 min 和 max 必须是数字' }
  if (min > max) return { success: false, error: 'random 操作的 min 不能大于 max' }
  const randomValue = integer
    ? Math.floor(Math.random() * (max - min + 1)) + min
    : Math.random() * (max - min) + min
  variableContext[varName] = randomValue
  return { success: true }
}

module.exports = { types, parse, execute }