reorder_wanikani.js

const getAndSortLessons = () => {
  const currentActive = $.jStorage.get("l/activeQueue")

  const activeCount = currentActive.length

  const currentLessons = $.jStorage.get("l/lessonQueue")

  const allLessons = [...currentActive, ...currentLessons]

  const [radicals, kanji, vocabulary] = allLessons.reduce(
    ([radicals, kanji, vocabulary], item) => {
      if (item.rad) {
        return [[...radicals, item], kanji, vocabulary]
      }
      if (item.kan) {
        return [radicals, [...kanji, item], vocabulary]
      }
      return [radicals, kanji, [...vocabulary, item]]
    },
    [[], [], []]
  )

  return {
    radicals,
    kanji,
    vocabulary,
    activeCount
  }
}

const setUpdatedLessons = (reorderedLessons, activeCount) => {
  const newActiveList = reorderedLessons.slice(0, activeCount)

  const lessonsList = reorderedLessons.slice(activeCount)

  $.jStorage.set("l/lessonQueue", reorderedLessons)

  $.jStorage.set("l/activeQueue", newActiveList)
}

const reorderRadicalsKanjiFirst = () => {
  const {
    radicals,
    kanji,
    vocabulary,
    activeCount
  } = getAndSortLessons()

  const reorderedLessons = [...radicals, ...kanji, ...vocabulary]

  setUpdatedLessons(reorderedLessons, activeCount)
}

const reorderVocabFirst = () => {
  const {
    radicals,
    kanji,
    vocabulary,
    activeCount
  } = getAndSortLessons()

  const reorderedLessons = [...vocabulary, ...radicals, ...kanji]

  setUpdatedLessons(reorderedLessons, activeCount)
}