"use strict";

const declarationColonSpaceChecker = require("../declarationColonSpaceChecker");
const declarationValueIndex = require("../../utils/declarationValueIndex");
const ruleMessages = require("../../utils/ruleMessages");
const validateOptions = require("../../utils/validateOptions");
const whitespaceChecker = require("../../utils/whitespaceChecker");

const ruleName = "declaration-colon-space-after";

const messages = ruleMessages(ruleName, {
  expectedAfter: () => 'Expected single space after ":"',
  rejectedAfter: () => 'Unexpected whitespace after ":"',
  expectedAfterSingleLine: () =>
    'Expected single space after ":" with a single-line declaration'
});

const rule = function(expectation, options, context) {
  const checker = whitespaceChecker("space", expectation, messages);

  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: ["always", "never", "always-single-line"]
    });

    if (!validOptions) {
      return;
    }

    declarationColonSpaceChecker({
      root,
      result,
      locationChecker: checker.after,
      checkedRuleName: ruleName,
      fix: context.fix
        ? (decl, index) => {
            const colonIndex = index - declarationValueIndex(decl);
            const between = decl.raws.between;

            if (expectation.indexOf("always") === 0) {
              decl.raws.between =
                between.slice(0, colonIndex) +
                between.slice(colonIndex).replace(/^:\s*/, ": ");

              return true;
            } else if (expectation === "never") {
              decl.raws.between =
                between.slice(0, colonIndex) +
                between.slice(colonIndex).replace(/^:\s*/, ":");

              return true;
            }
          }
        : null
    });
  };
};

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