"use strict";

const blockString = require("../../utils/blockString");
const nextNonCommentNode = require("../../utils/nextNonCommentNode");
const rawNodeString = require("../../utils/rawNodeString");
const report = require("../../utils/report");
const ruleMessages = require("../../utils/ruleMessages");
const validateOptions = require("../../utils/validateOptions");
const whitespaceChecker = require("../../utils/whitespaceChecker");

const ruleName = "declaration-block-semicolon-newline-after";

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

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", "never-multi-line"]
    });

    if (!validOptions) {
      return;
    }

    root.walkDecls(decl => {
      // Ignore last declaration if there's no trailing semicolon
      const parentRule = decl.parent;

      if (!parentRule.raws.semicolon && parentRule.last === decl) {
        return;
      }

      const nextNode = decl.next();

      if (!nextNode) {
        return;
      }

      // Allow end-of-line comment
      const nodeToCheck = nextNonCommentNode(nextNode);

      if (!nodeToCheck) {
        return;
      }

      checker.afterOneOnly({
        source: rawNodeString(nodeToCheck),
        index: -1,
        lineCheckStr: blockString(parentRule),
        err: m => {
          if (context.fix) {
            if (expectation.indexOf("always") === 0) {
              const index = nodeToCheck.raws.before.search(/\r?\n/);

              if (index >= 0) {
                nodeToCheck.raws.before = nodeToCheck.raws.before.slice(index);
              } else {
                nodeToCheck.raws.before =
                  context.newline + nodeToCheck.raws.before;
              }

              return;
            } else if (expectation === "never-multi-line") {
              nodeToCheck.raws.before = "";

              return;
            }
          }

          report({
            message: m,
            node: decl,
            index: decl.toString().length + 1,
            result,
            ruleName
          });
        }
      });
    });
  };
};

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