"use strict"

const blockString = require("../../utils/blockString")
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-before"

const messages = ruleMessages(ruleName, {
  expectedBefore: () => "Expected newline before \";\"",
  expectedBeforeMultiLine: () => "Expected newline before \";\" in a multi-line declaration block",
  rejectedBeforeMultiLine: () => "Unexpected whitespace before \";\" in a multi-line declaration block",
})

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

  return function (root, result) {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: [
        "always",
        "always-multi-line",
        "never-multi-line",
      ],
    })
    if (!validOptions) {
      return
    }

    root.walkDecls(function (decl) {
      const parentRule = decl.parent
      if (
        !parentRule.raws.semicolon
        && parentRule.last === decl
      ) {
        return
      }

      const declString = decl.toString()

      checker.beforeAllowingIndentation({
        source: declString,
        index: declString.length,
        lineCheckStr: blockString(parentRule),
        err: m => {
          report({
            message: m,
            node: decl,
            index: decl.toString().length - 1,
            result,
            ruleName,
          })
        },
      })
    })
  }
}

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