"use strict"

const blockString = require("../../utils/blockString")
const hasBlock = require("../../utils/hasBlock")
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 = "block-closing-brace-space-after"

const messages = ruleMessages(ruleName, {
  expectedAfter: () => "Expected single space after \"}\"",
  rejectedAfter: () => "Unexpected whitespace after \"}\"",
  expectedAfterSingleLine: () => "Expected single space after \"}\" of a single-line block",
  rejectedAfterSingleLine: () => "Unexpected whitespace after \"}\" of a single-line block",
  expectedAfterMultiLine: () => "Expected single space after \"}\" of a multi-line block",
  rejectedAfterMultiLine: () => "Unexpected whitespace after \"}\" of a multi-line block",
})

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

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

    // Check both kinds of statements: rules and at-rules
    root.walkRules(check)
    root.walkAtRules(check)

    function check(statement) {
      const nextNode = statement.next()
      if (!nextNode) {
        return
      }
      if (!hasBlock(statement)) {
        return
      }

      let reportIndex = statement.toString().length
      let source = rawNodeString(nextNode)

      // Skip a semicolon at the beginning, if any
      if (
        source
        && source[0] === ";"
      ) {
        source = source.slice(1)
        reportIndex++
      }

      checker.after({
        source,
        index: -1,
        lineCheckStr: blockString(statement),
        err: msg => {
          report({
            message: msg,
            node: statement,
            index: reportIndex,
            result,
            ruleName,
          })
        },
      })
    }
  }
}

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