"use strict"

const report = require("../../utils/report")
const ruleMessages = require("../../utils/ruleMessages")
const validateOptions = require("../../utils/validateOptions")

const ruleName = "stylelint-disable-reason"

const messages = ruleMessages(ruleName, {
  expectedBefore: "Expected comment reason before `stylelint-disable` comment",
  expectedAfter: "Expected comment reason after `stylelint-disable` comment",
})

const stylelintDisableCommand = "stylelint-disable"
const stylelintDisableLineCommand = "stylelint-disable-line"

const rule = function (expectation) {
  return function (root, result) {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: [
        "always-before",
        "always-after",
      ],
    })
    if (!validOptions) {
      return
    }

    result.warn((
      `'${ruleName}' has been deprecated and in 8.0 will be removed.`
    ), {
      stylelintType: "deprecation",
      stylelintReference: `https://stylelint.io/user-guide/rules/${ruleName}/`,
    })

    root.walkComments(function (comment) {
      if (comment.text.indexOf(stylelintDisableCommand) !== 0) {
        return
      }

      if (expectation === "always-before") {
        const prev = comment.prev()
        const prevIsCommentAndValid = prev && prev.type === "comment" && !isDisableCommand(prev.text)

        let prevDisableLineIsCommentAndValid = false

        if (comment.text.indexOf(stylelintDisableLineCommand) === 0 && !prevIsCommentAndValid && prev) {
          const friendlyPrev = prev.prev()

          prevDisableLineIsCommentAndValid = friendlyPrev && friendlyPrev.type === "comment" && !isDisableCommand(friendlyPrev.text)
        }

        if (!prevIsCommentAndValid && !prevDisableLineIsCommentAndValid) {
          const disabledRanges = result.stylelint.disabledRanges
          result.stylelint.disabledRanges = false

          report({
            message: messages.expectedBefore,
            node: comment,
            result,
            ruleName,
          })
          result.stylelint.disabledRanges = disabledRanges
        }
      } else if (expectation === "always-after") {
        const next = comment.next()
        const nextIsCommentAndValid = next && next.type === "comment" && !isDisableCommand(next.text)

        if (!nextIsCommentAndValid) {
          const disabledRanges = result.stylelint.disabledRanges
          result.stylelint.disabledRanges = false

          report({
            message: messages.expectedAfter,
            node: comment,
            result,
            ruleName,
          })
          result.stylelint.disabledRanges = disabledRanges
        }
      }
    })

    function isDisableCommand(text) {
      return text.indexOf(stylelintDisableCommand) === 0
    }
  }
}

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