/** 语句：set 设置变量 */
const types = ['set']

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

async function execute(action, ctx) {
  const { variableContext, extractVarName, resolveValue, 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 }