"use strict"

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

const ruleName = "declaration-colon-newline-after"

const messages = ruleMessages(ruleName, {
  expectedAfter: () => "Expected newline after \":\"",
  expectedAfterMultiLine: () => "Expected newline after \":\" with a multi-line declaration",
})

const rule = function (expectation) {
  const checker = whitespaceChecker("newline", expectation, messages)
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: [
        "always",
        "always-multi-line",
      ],
    })
    if (!validOptions) {
      return
    }

    root.walkDecls(decl => {
      if (!isStandardSyntaxDeclaration(decl)) {
        return
      }

      // Get the raw prop, and only the prop
      const endOfPropIndex = declarationValueIndex(decl) + (decl.raws.between || "").length - 1

      // The extra characters tacked onto the end ensure that there is a character to check
      // after the colon. Otherwise, with `background:pink` the character after the
      const propPlusColon = decl.toString().slice(0, endOfPropIndex) + "xxx"

      for (let i = 0, l = propPlusColon.length; i < l; i++) {
        if (propPlusColon[i] !== ":") {
          continue
        }
        const indexToCheck = propPlusColon.substr(propPlusColon[i], 3) === "/*" ? propPlusColon.indexOf("*/", i) + 1 : i

        checker.afterOneOnly({
          source: propPlusColon,
          index: indexToCheck,
          lineCheckStr: decl.value,
          err: m => {
            report({
              message: m,
              node: decl,
              index: indexToCheck,
              result,
              ruleName,
            })
          },
        })
      }
    })
  }
}

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