"use strict"

const _ = require("lodash")
const postcss = require("postcss")
const report = require("../../utils/report")
const ruleMessages = require("../../utils/ruleMessages")
const validateOptions = require("../../utils/validateOptions")

const ruleName = "at-rule-whitelist"

const messages = ruleMessages(ruleName, {
  rejected: name => `Unexpected at-rule "${name}"`,
})

const rule = function (whitelistInput) {
  // To allow for just a string as a parameter (not only arrays of strings)
  const whitelist = [].concat(whitelistInput)
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: whitelist,
      possible: [_.isString],
    })
    if (!validOptions) {
      return
    }

    root.walkAtRules(atRule => {
      const name = atRule.name

      if (whitelist.indexOf(postcss.vendor.unprefixed(name).toLowerCase()) !== -1) {
        return
      }

      report({
        message: messages.rejected(name),
        node: atRule,
        result,
        ruleName,
      })
    })
  }
}

rule.primaryOptionArray = true

rule.ruleName = ruleName
rule.messages = messages
module.exports = rule