"use strict";

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

const ruleName = "custom-media-pattern";

const messages = ruleMessages(ruleName, {
  expected: "Expected custom media query name to match specified pattern"
});

const rule = function(pattern) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: pattern,
      possible: [_.isRegExp, _.isString]
    });

    if (!validOptions) {
      return;
    }

    const regexpPattern = _.isString(pattern) ? new RegExp(pattern) : pattern;

    root.walkAtRules(atRule => {
      if (atRule.name.toLowerCase() !== "custom-media") {
        return;
      }

      const customMediaName = atRule.params.match(/^--(\S+)\b/)[1];

      if (regexpPattern.test(customMediaName)) {
        return;
      }

      report({
        message: messages.expected,
        node: atRule,
        index: atRuleParamIndex(atRule),
        result,
        ruleName
      });
    });
  };
};

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