import { defineMessages, injectIntl } from 'react-intl'
import ImmutablePropTypes from 'react-immutable-proptypes'
import ImmutablePureComponent from 'react-immutable-pure-component'
import { Map as ImmutableMap } from 'immutable'
import { createSelector } from 'reselect'
import detectPassiveEvents from 'detect-passive-events'
import { changeSetting } from '../../actions/settings'
import { useEmoji } from '../../actions/emojis'
import { closePopover } from '../../actions/popover'
import { insertEmojiCompose } from '../../actions/compose'
import { EmojiPicker as EmojiPickerAsync } from '../../features/ui/util/async_components'
import { buildCustomEmojis } from '../emoji/emoji'
import PopoverLayout from './popover_layout'
import ColumnIndicator from '../column_indicator'

import '!style-loader!css-loader!emoji-mart/css/emoji-mart.css'

const messages = defineMessages({
  emoji: { id: 'emoji_button.label', defaultMessage: 'Insert emoji' },
  emoji_search: { id: 'emoji_button.search', defaultMessage: 'Search for emoji' },
  emoji_not_found: { id: 'emoji_button.not_found', defaultMessage: 'No emojos!! (╯°□°）╯︵ ┻━┻' },
  custom: { id: 'emoji_button.custom', defaultMessage: 'Custom' },
  recent: { id: 'emoji_button.recent', defaultMessage: 'Frequently used' },
  search_results: { id: 'emoji_button.search_results', defaultMessage: 'Search results' },
  people: { id: 'emoji_button.people', defaultMessage: 'People' },
  nature: { id: 'emoji_button.nature', defaultMessage: 'Nature' },
  food: { id: 'emoji_button.food', defaultMessage: 'Food & Drink' },
  activity: { id: 'emoji_button.activity', defaultMessage: 'Activity' },
  travel: { id: 'emoji_button.travel', defaultMessage: 'Travel & Places' },
  objects: { id: 'emoji_button.objects', defaultMessage: 'Objects' },
  symbols: { id: 'emoji_button.symbols', defaultMessage: 'Symbols' },
  flags: { id: 'emoji_button.flags', defaultMessage: 'Flags' },
})

const assetHost = process.env.CDN_HOST || ''
let EmojiPicker, Emoji // load asynchronously

const backgroundImageFn = () => `${assetHost}/emoji/sheet.png`
const listenerOptions = detectPassiveEvents.hasSupport ? { passive: true } : false

const perLine = 8
const lines = 2

const DEFAULTS = [
  '+1',
  'grinning',
  'kissing_heart',
  'heart_eyes',
  'laughing',
  'stuck_out_tongue_winking_eye',
  'sweat_smile',
  'joy',
  'yum',
  'disappointed',
  'thinking_face',
  'weary',
  'sob',
  'sunglasses',
  'heart',
  'ok_hand',
]

const categoriesSort = [
  'recent',
  'custom',
  'people',
  'nature',
  'foods',
  'activity',
  'places',
  'objects',
  'symbols',
  'flags',
]

const getFrequentlyUsedEmojis = createSelector([
  state => state.getIn(['settings', 'frequentlyUsedEmojis'], ImmutableMap()),
], emojiCounters => {
  let emojis = emojiCounters
    .keySeq()
    .sort((a, b) => emojiCounters.get(a) - emojiCounters.get(b))
    .reverse()
    .slice(0, perLine * lines)
    .toArray();

  if (emojis.length < DEFAULTS.length) {
    let uniqueDefaults = DEFAULTS.filter(emoji => !emojis.includes(emoji));
    emojis = emojis.concat(uniqueDefaults.slice(0, DEFAULTS.length - emojis.length));
  }

  return emojis;
})

const getCustomEmojis = createSelector([
  state => state.get('custom_emojis'),
], emojis => emojis.filter(e => e.get('visible_in_picker')).sort((a, b) => {
  const aShort = a.get('shortcode').toLowerCase();
  const bShort = b.get('shortcode').toLowerCase();

  if (aShort < bShort) {
    return -1;
  } else if (aShort > bShort ) {
    return 1;
  }

  return 0;
}));

@injectIntl
class EmojiPickerMenu extends ImmutablePureComponent {

  static propTypes = {
    customEmojis: ImmutablePropTypes.list,
    frequentlyUsedEmojis: PropTypes.arrayOf(PropTypes.string),
    loading: PropTypes.bool,
    onClose: PropTypes.func.isRequired,
    onPick: PropTypes.func.isRequired,
    arrowOffsetLeft: PropTypes.string,
    arrowOffsetTop: PropTypes.string,
    intl: PropTypes.object.isRequired,
    skinTone: PropTypes.number.isRequired,
    onSkinTone: PropTypes.func.isRequired,
  }

  static defaultProps = {
    loading: true,
    frequentlyUsedEmojis: [],
  }

  getI18n = () => {
    const { intl } = this.props

    return {
      search: intl.formatMessage(messages.emoji_search),
      notfound: intl.formatMessage(messages.emoji_not_found),
      categories: {
        search: intl.formatMessage(messages.search_results),
        recent: intl.formatMessage(messages.recent),
        people: intl.formatMessage(messages.people),
        nature: intl.formatMessage(messages.nature),
        foods: intl.formatMessage(messages.food),
        activity: intl.formatMessage(messages.activity),
        places: intl.formatMessage(messages.travel),
        objects: intl.formatMessage(messages.objects),
        symbols: intl.formatMessage(messages.symbols),
        flags: intl.formatMessage(messages.flags),
        custom: intl.formatMessage(messages.custom),
      },
    }
  }

  handleClick = emoji => {
    if (!emoji.native) {
      emoji.native = emoji.colons
    }

    this.props.onClose()
    this.props.onPick(emoji)
  }

  handleModifierChange = modifier => {
    this.props.onSkinTone(modifier)
  }

  render () {
    const {
      loading,
      intl,
      customEmojis,
      skinTone,
      frequentlyUsedEmojis,
    } = this.props

    if (loading) {
      return (
        <div style={{ width: 340, height: 425 }}>
          <ColumnIndicator type='loading' />
        </div>
      )
    }

    const title = intl.formatMessage(messages.emoji)

    return (
      <EmojiPicker
        backgroundImageFn={backgroundImageFn}
        custom={buildCustomEmojis(customEmojis)}
        title={title}
        i18n={this.getI18n()}
        onClick={this.handleClick}
        include={categoriesSort}
        recent={frequentlyUsedEmojis}
        skin={skinTone}
        emojiSize={24}
        set='twitter'
        color='#30CE7D'
        emoji=''
        autoFocus
        emojiTooltip
        onSkinChange={this.handleModifierChange}
      />
    )
  }

}

const mapStateToProps = (state) => ({
  customEmojis: getCustomEmojis(state),
  skinTone: state.getIn(['settings', 'skinTone']),
  frequentlyUsedEmojis: getFrequentlyUsedEmojis(state),
})

const mapDispatchToProps = (dispatch) => ({
  onClosePopover() {
    dispatch(closePopover())
  },

  onSkinTone: (skinTone) => {
    dispatch(changeSetting(['skinTone'], skinTone))
  },

  onPickEmoji: (emoji) => {
    dispatch(useEmoji(emoji))
    dispatch(insertEmojiCompose(0, emoji, false))
  },
})

export default
@connect(mapStateToProps, mapDispatchToProps)
class EmojiPickerPopover extends ImmutablePureComponent {

  static propTypes = {
    customEmojis: ImmutablePropTypes.list,
    frequentlyUsedEmojis: PropTypes.arrayOf(PropTypes.string),
    intl: PropTypes.object.isRequired,
    onPickEmoji: PropTypes.func.isRequired,
    onSkinTone: PropTypes.func.isRequired,
    skinTone: PropTypes.number.isRequired,
    onClosePopover: PropTypes.func.isRequired,
  }

  state = {
    loading: false,
  }

  componentWillMount = () => {
    if (!EmojiPicker) {
      this.setState({ loading: true })

      EmojiPickerAsync().then((EmojiMart) => {
        EmojiPicker = EmojiMart.Picker
        Emoji       = EmojiMart.Emoji

        this.setState({ loading: false })
      }).catch(() => {
        this.setState({ loading: false })
      })
    }
  }

  onHideDropdown = () => {
    this.props.onClosePopover()
  }

  render () {
    const {
      onPickEmoji,
      onSkinTone,
      skinTone,
      frequentlyUsedEmojis,
      customEmojis,
    } = this.props
    
    const { loading } = this.state
    
    return (
      <PopoverLayout width={340}>
        <EmojiPickerMenu
          customEmojis={customEmojis}
          loading={loading}
          onClose={this.onHideDropdown}
          onPick={onPickEmoji}
          onSkinTone={onSkinTone}
          skinTone={skinTone}
          frequentlyUsedEmojis={frequentlyUsedEmojis}
        />
      </PopoverLayout>
    )
  }

}