/**
 * @typedef {import('micromark-util-types').Construct} Construct
 * @typedef {import('micromark-util-types').Tokenizer} Tokenizer
 * @typedef {import('micromark-util-types').State} State
 * @typedef {import('micromark-util-types').Code} Code
 */

import {ok as assert} from 'uvu/assert'
import {factorySpace} from 'micromark-factory-space'
import {
  markdownLineEnding,
  markdownLineEndingOrSpace
} from 'micromark-util-character'
import {codes} from 'micromark-util-symbol/codes.js'
import {constants} from 'micromark-util-symbol/constants.js'
import {types} from 'micromark-util-symbol/types.js'

/** @type {Construct} */
export const codeFenced = {
  name: 'codeFenced',
  tokenize: tokenizeCodeFenced,
  concrete: true
}

/** @type {Tokenizer} */
function tokenizeCodeFenced(effects, ok, nok) {
  const self = this
  /** @type {Construct} */
  const closingFenceConstruct = {tokenize: tokenizeClosingFence, partial: true}
  /** @type {Construct} */
  const nonLazyLine = {tokenize: tokenizeNonLazyLine, partial: true}
  const tail = this.events[this.events.length - 1]
  const initialPrefix =
    tail && tail[1].type === types.linePrefix
      ? tail[2].sliceSerialize(tail[1], true).length
      : 0
  let sizeOpen = 0
  /** @type {NonNullable<Code>} */
  let marker

  return start

  /** @type {State} */
  function start(code) {
    assert(
      code === codes.graveAccent || code === codes.tilde,
      'expected `` ` `` or `~`'
    )
    effects.enter(types.codeFenced)
    effects.enter(types.codeFencedFence)
    effects.enter(types.codeFencedFenceSequence)
    marker = code
    return sequenceOpen(code)
  }

  /** @type {State} */
  function sequenceOpen(code) {
    if (code === marker) {
      effects.consume(code)
      sizeOpen++
      return sequenceOpen
    }

    effects.exit(types.codeFencedFenceSequence)
    return sizeOpen < constants.codeFencedSequenceSizeMin
      ? nok(code)
      : factorySpace(effects, infoOpen, types.whitespace)(code)
  }

  /** @type {State} */
  function infoOpen(code) {
    if (code === codes.eof || markdownLineEnding(code)) {
      return openAfter(code)
    }

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

  /** @type {State} */
  function info(code) {
    if (code === codes.eof || markdownLineEndingOrSpace(code)) {
      effects.exit(types.chunkString)
      effects.exit(types.codeFencedFenceInfo)
      return factorySpace(effects, infoAfter, types.whitespace)(code)
    }

    if (code === codes.graveAccent && code === marker) return nok(code)
    effects.consume(code)
    return info
  }

  /** @type {State} */
  function infoAfter(code) {
    if (code === codes.eof || markdownLineEnding(code)) {
      return openAfter(code)
    }

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

  /** @type {State} */
  function meta(code) {
    if (code === codes.eof || markdownLineEnding(code)) {
      effects.exit(types.chunkString)
      effects.exit(types.codeFencedFenceMeta)
      return openAfter(code)
    }

    if (code === codes.graveAccent && code === marker) return nok(code)
    effects.consume(code)
    return meta
  }

  /** @type {State} */
  function openAfter(code) {
    effects.exit(types.codeFencedFence)
    return self.interrupt ? ok(code) : contentStart(code)
  }

  /** @type {State} */
  function contentStart(code) {
    if (code === codes.eof) {
      return after(code)
    }

    if (markdownLineEnding(code)) {
      return effects.attempt(
        nonLazyLine,
        effects.attempt(
          closingFenceConstruct,
          after,
          initialPrefix
            ? factorySpace(
                effects,
                contentStart,
                types.linePrefix,
                initialPrefix + 1
              )
            : contentStart
        ),
        after
      )(code)
    }

    effects.enter(types.codeFlowValue)
    return contentContinue(code)
  }

  /** @type {State} */
  function contentContinue(code) {
    if (code === codes.eof || markdownLineEnding(code)) {
      effects.exit(types.codeFlowValue)
      return contentStart(code)
    }

    effects.consume(code)
    return contentContinue
  }

  /** @type {State} */
  function after(code) {
    effects.exit(types.codeFenced)
    return ok(code)
  }

  /** @type {Tokenizer} */
  function tokenizeNonLazyLine(effects, ok, nok) {
    const self = this

    return start

    /** @type {State} */
    function start(code) {
      assert(markdownLineEnding(code), 'expected eol')
      effects.enter(types.lineEnding)
      effects.consume(code)
      effects.exit(types.lineEnding)
      return lineStart
    }

    /** @type {State} */
    function lineStart(code) {
      return self.parser.lazy[self.now().line] ? nok(code) : ok(code)
    }
  }

  /** @type {Tokenizer} */
  function tokenizeClosingFence(effects, ok, nok) {
    let size = 0

    return factorySpace(
      effects,
      closingSequenceStart,
      types.linePrefix,
      this.parser.constructs.disable.null.includes('codeIndented')
        ? undefined
        : constants.tabSize
    )

    /** @type {State} */
    function closingSequenceStart(code) {
      effects.enter(types.codeFencedFence)
      effects.enter(types.codeFencedFenceSequence)
      return closingSequence(code)
    }

    /** @type {State} */
    function closingSequence(code) {
      if (code === marker) {
        effects.consume(code)
        size++
        return closingSequence
      }

      if (size < sizeOpen) return nok(code)
      effects.exit(types.codeFencedFenceSequence)
      return factorySpace(effects, closingSequenceEnd, types.whitespace)(code)
    }

    /** @type {State} */
    function closingSequenceEnd(code) {
      if (code === codes.eof || markdownLineEnding(code)) {
        effects.exit(types.codeFencedFence)
        return ok(code)
      }

      return nok(code)
    }
  }
}