"use strict";

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

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

const messages = ruleMessages(ruleName, {
  expectedAfter: () => 'Expected newline after ":"',
  expectedAfterMultiLine: () =>
    'Expected newline after ":" with a multi-line declaration'
});

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

  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: ["always", "always-multi-line"]
    });

    if (!validOptions) {
      return;
    }

    root.walkDecls(decl => {
      if (!isStandardSyntaxDeclaration(decl)) {
        return;
      }

      // Get the raw prop, and only the prop
      const endOfPropIndex =
        declarationValueIndex(decl) + (decl.raws.between || "").length - 1;

      // The extra characters tacked onto the end ensure that there is a character to check
      // after the colon. Otherwise, with `background:pink` the character after the
      const propPlusColon = decl.toString().slice(0, endOfPropIndex) + "xxx";

      for (let i = 0, l = propPlusColon.length; i < l; i++) {
        if (propPlusColon[i] !== ":") {
          continue;
        }

        const indexToCheck = /^[^\S\r\n]*\/\*/.test(propPlusColon.slice(i + 1))
          ? propPlusColon.indexOf("*/", i) + 1
          : i;

        checker.afterOneOnly({
          source: propPlusColon,
          index: indexToCheck,
          lineCheckStr: decl.value,
          err: m => {
            if (context.fix) {
              const between = decl.raws.between;
              const betweenStart = declarationValueIndex(decl) - between.length;
              const sliceIndex = indexToCheck - betweenStart + 1;
              const betweenBefore = between.slice(0, sliceIndex);
              const betweenAfter = between.slice(sliceIndex);

              if (/^\s*\r?\n/.test(betweenAfter)) {
                decl.raws.between =
                  betweenBefore + betweenAfter.replace(/^[^\S\r\n]*/, "");
              } else {
                decl.raws.between =
                  betweenBefore + context.newline + betweenAfter;
              }

              return;
            }

            report({
              message: m,
              node: decl,
              index: indexToCheck,
              result,
              ruleName
            });
          }
        });
      }
    });
  };
};

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