import data from '../data'
import { getData, getSanitizedData, intersect } from '.'

var originalPool = {}
var index = {}
var emojisList = {}
var emoticonsList = {}
var customEmojisList = []

for (let emoji in data.emojis) {
  let emojiData = data.emojis[emoji],
    { short_names, emoticons } = emojiData,
    id = short_names[0]

  if (emoticons) {
    emoticons.forEach((emoticon) => {
      if (emoticonsList[emoticon]) {
        return
      }

      emoticonsList[emoticon] = id
    })
  }

  emojisList[id] = getSanitizedData(id)
  originalPool[id] = emojiData
}

function clearCustomEmojis(pool) {
  customEmojisList.forEach((emoji) => {
    let emojiId = emoji.id || emoji.short_names[0]

    delete pool[emojiId]
    delete emojisList[emojiId]
  })
}

function addCustomToPool(custom, pool) {
  if (customEmojisList.length) clearCustomEmojis(pool)

  custom.forEach((emoji) => {
    let emojiId = emoji.id || emoji.short_names[0]

    if (emojiId && !pool[emojiId]) {
      pool[emojiId] = getData(emoji)
      emojisList[emojiId] = getSanitizedData(emoji)
    }
  })

  customEmojisList = custom
  index = {}
}

function search(
  value,
  { emojisToShowFilter, maxResults, include, exclude, custom = [] } = {},
) {
  if (customEmojisList != custom) addCustomToPool(custom, originalPool)

  maxResults || (maxResults = 75)
  include || (include = [])
  exclude || (exclude = [])

  var results = null,
    pool = originalPool

  if (value.length) {
    if (value == '-' || value == '-1') {
      return [emojisList['-1']]
    }

    var values = value.toLowerCase().split(/[\s|,|\-|_]+/),
      allResults = []

    if (values.length > 2) {
      values = [values[0], values[1]]
    }

    if (include.length || exclude.length) {
      pool = {}

      data.categories.forEach((category) => {
        let isIncluded =
          include && include.length ? include.indexOf(category.id) > -1 : true
        let isExcluded =
          exclude && exclude.length ? exclude.indexOf(category.id) > -1 : false
        if (!isIncluded || isExcluded) {
          return
        }

        category.emojis.forEach(
          (emojiId) => (pool[emojiId] = data.emojis[emojiId]),
        )
      })

      if (custom.length) {
        let customIsIncluded =
          include && include.length ? include.indexOf('custom') > -1 : true
        let customIsExcluded =
          exclude && exclude.length ? exclude.indexOf('custom') > -1 : false
        if (customIsIncluded && !customIsExcluded) {
          addCustomToPool(custom, pool)
        }
      }
    }

    allResults = values
      .map((value) => {
        var aPool = pool,
          aIndex = index,
          length = 0

        for (let charIndex = 0; charIndex < value.length; charIndex++) {
          const char = value[charIndex]
          length++

          aIndex[char] || (aIndex[char] = {})
          aIndex = aIndex[char]

          if (!aIndex.results) {
            let scores = {}

            aIndex.results = []
            aIndex.pool = {}

            for (let id in aPool) {
              let emoji = aPool[id],
                { search } = emoji,
                sub = value.substr(0, length),
                subIndex = search.indexOf(sub)

              if (subIndex != -1) {
                let score = subIndex + 1
                if (sub == id) score = 0

                aIndex.results.push(emojisList[id])
                aIndex.pool[id] = emoji

                scores[id] = score
              }
            }

            aIndex.results.sort((a, b) => {
              var aScore = scores[a.id],
                bScore = scores[b.id]

              return aScore - bScore
            })
          }

          aPool = aIndex.pool
        }

        return aIndex.results
      })
      .filter((a) => a)

    if (allResults.length > 1) {
      results = intersect.apply(null, allResults)
    } else if (allResults.length) {
      results = allResults[0]
    } else {
      results = []
    }
  }

  if (results) {
    if (emojisToShowFilter) {
      results = results.filter((result) => emojisToShowFilter(pool[result.id]))
    }

    if (results && results.length > maxResults) {
      results = results.slice(0, maxResults)
    }
  }

  return results
}

export default { search, emojis: emojisList, emoticons: emoticonsList }