"use strict"

const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
const isStandardSyntaxSelector = require("../../utils/isStandardSyntaxSelector")
const parseSelector = require("../../utils/parseSelector")
const report = require("../../utils/report")
const ruleMessages = require("../../utils/ruleMessages")
const validateOptions = require("../../utils/validateOptions")
const keywordSets = require("../../reference/keywordSets")

const ruleName = "selector-pseudo-element-case"

const messages = ruleMessages(ruleName, {
  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`,
})

const rule = function (expectation) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: [
        "lower",
        "upper",
      ],
    })
    if (!validOptions) {
      return
    }

    root.walkRules(rule => {
      if (!isStandardSyntaxRule(rule)) {
        return
      }
      const selector = rule.selector
      const startIndexPseudoElement = selector.indexOf(":")

      if (startIndexPseudoElement === -1) {
        return
      }

      parseSelector(selector, result, rule, selectorTree => {
        selectorTree.walkPseudos(pseudoNode => {
          const pseudoElement = pseudoNode.value

          if (!isStandardSyntaxSelector(pseudoElement)) {
            return
          }

          if (pseudoElement.indexOf("::") === -1 && !keywordSets.levelOneAndTwoPseudoElements.has(pseudoElement.toLowerCase().slice(1))) {
            return
          }

          const expectedPseudoElement = expectation === "lower" ? pseudoElement.toLowerCase() : pseudoElement.toUpperCase()

          if (pseudoElement === expectedPseudoElement) {
            return
          }

          report({
            message: messages.expected(pseudoElement, expectedPseudoElement),
            node: rule,
            index: pseudoNode.sourceIndex,
            ruleName,
            result,
          })
        })
      })
    })
  }
}

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