"use strict"

const isValidHex = require("../../utils/isValidHex")
const report = require("../../utils/report")
const ruleMessages = require("../../utils/ruleMessages")
const styleSearch = require("style-search")
const validateOptions = require("../../utils/validateOptions")

const ruleName = "color-no-invalid-hex"

const messages = ruleMessages(ruleName, {
  rejected: hex => `Unexpected invalid hex color "${hex}"`,
})

const rule = function (actual) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, { actual })
    if (!validOptions) {
      return
    }

    root.walkDecls(decl => {
      const declString = decl.toString()

      styleSearch({ source: declString, target: "#" }, match => {
        // If there's not a colon, comma, or whitespace character before, we'll assume this is
        // not intended to be a hex color, but is instead something like the
        // hash in a url() argument
        if (!/[:,\s]/.test(declString[match.startIndex - 1])) {
          return
        }

        const hexMatch = /^#[0-9A-Za-z]+/.exec(declString.substr(match.startIndex))
        if (!hexMatch) {
          return
        }

        const hexValue = hexMatch[0]
        if (isValidHex(hexValue)) {
          return
        }

        report({
          message: messages.rejected(hexValue),
          node: decl,
          index: match.startIndex,
          result,
          ruleName,
        })
      })
    })
  }
}

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