"use strict";

const isCustomProperty = require("../../utils/isCustomProperty");
const isStandardSyntaxProperty = require("../../utils/isStandardSyntaxProperty");
const report = require("../../utils/report");
const ruleMessages = require("../../utils/ruleMessages");
const validateOptions = require("../../utils/validateOptions");

const ruleName = "property-case";

const messages = ruleMessages(ruleName, {
  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`
});

const rule = function(expectation) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: ["lower", "upper"]
    });
    if (!validOptions) {
      return;
    }

    root.walkDecls(decl => {
      const prop = decl.prop;

      if (!isStandardSyntaxProperty(prop)) {
        return;
      }
      if (isCustomProperty(prop)) {
        return;
      }

      const expectedProp =
        expectation === "lower" ? prop.toLowerCase() : prop.toUpperCase();
      if (prop === expectedProp) {
        return;
      }

      report({
        message: messages.expected(prop, expectedProp),
        node: decl,
        ruleName,
        result
      });
    });
  };
};

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