"use strict";

const beforeBlockString = require("../../utils/beforeBlockString");
const hasEmptyBlock = require("../../utils/hasEmptyBlock");
const report = require("../../utils/report");
const ruleMessages = require("../../utils/ruleMessages");
const validateOptions = require("../../utils/validateOptions");

const ruleName = "block-no-empty";

const messages = ruleMessages(ruleName, {
  rejected: "Unexpected empty block"
});

const rule = function(actual) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, { actual });
    if (!validOptions) {
      return;
    }

    // Check both kinds of statements: rules and at-rules
    root.walkRules(check);
    root.walkAtRules(check);

    function check(statement) {
      if (!hasEmptyBlock(statement)) {
        return;
      }

      let index = beforeBlockString(statement, { noRawBefore: true }).length;

      // For empty blocks when using SugarSS parser
      if (statement.raws.between === undefined) {
        index--;
      }

      report({
        message: messages.rejected,
        node: statement,
        index,
        result,
        ruleName
      });
    }
  };
};

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