export default titleFactory

import assert from 'assert'
import codes from '../character/codes.mjs'
import markdownLineEnding from '../character/markdown-line-ending.mjs'
import constants from '../constant/constants.mjs'
import types from '../constant/types.mjs'
import spaceFactory from './factory-space.mjs'

// eslint-disable-next-line max-params
function titleFactory(effects, ok, nok, type, markerType, stringType) {
  var marker

  return start

  function start(code) {
    assert(
      code === codes.quotationMark ||
        code === codes.apostrophe ||
        code === codes.leftParenthesis,
      'expected `"`, `\'`, or `(`'
    )
    effects.enter(type)
    effects.enter(markerType)
    effects.consume(code)
    effects.exit(markerType)
    marker = code === codes.leftParenthesis ? codes.rightParenthesis : code
    return atFirstTitleBreak
  }

  function atFirstTitleBreak(code) {
    if (code === marker) {
      effects.enter(markerType)
      effects.consume(code)
      effects.exit(markerType)
      effects.exit(type)
      return ok
    }

    effects.enter(stringType)
    return atTitleBreak(code)
  }

  function atTitleBreak(code) {
    if (code === marker) {
      effects.exit(stringType)
      return atFirstTitleBreak(marker)
    }

    if (code === codes.eof) {
      return nok(code)
    }

    // Note: blank lines can’t exist in content.
    if (markdownLineEnding(code)) {
      effects.enter(types.lineEnding)
      effects.consume(code)
      effects.exit(types.lineEnding)
      return spaceFactory(effects, atTitleBreak, types.linePrefix)
    }

    effects.enter(types.chunkString, {contentType: constants.contentTypeString})
    return title(code)
  }

  function title(code) {
    if (code === marker || code === codes.eof || markdownLineEnding(code)) {
      effects.exit(types.chunkString)
      return atTitleBreak(code)
    }

    effects.consume(code)
    return code === codes.backslash ? titleEscape : title
  }

  function titleEscape(code) {
    if (code === marker || code === codes.backslash) {
      effects.consume(code)
      return title
    }

    return title(code)
  }
}