import PropTypes from 'prop-types'
import React from 'react'
import CSSModules from 'browser/lib/CSSModules'
import dataApi from 'browser/main/lib/dataApi'
import styles from './SideNav.styl'
import { openModal } from 'browser/main/lib/modal'
import PreferencesModal from '../modals/PreferencesModal'
import ConfigManager from 'browser/main/lib/ConfigManager'
import StorageItem from './StorageItem'
import TagListItem from 'browser/components/TagListItem'
import SideNavFilter from 'browser/components/SideNavFilter'
import StorageList from 'browser/components/StorageList'
import NavToggleButton from 'browser/components/NavToggleButton'
import EventEmitter from 'browser/main/lib/eventEmitter'
import PreferenceButton from './PreferenceButton'
import ListButton from './ListButton'
import TagButton from './TagButton'
import {SortableContainer} from 'react-sortable-hoc'
import i18n from 'browser/lib/i18n'
import context from 'browser/lib/context'

class SideNav extends React.Component {
  // TODO: should not use electron stuff v0.7

  componentDidMount () {
    EventEmitter.on('side:preferences', this.handleMenuButtonClick)
  }

  componentWillUnmount () {
    EventEmitter.off('side:preferences', this.handleMenuButtonClick)
  }

  handleMenuButtonClick (e) {
    openModal(PreferencesModal)
  }

  handleHomeButtonClick (e) {
    const { router } = this.context
    router.push('/home')
  }

  handleStarredButtonClick (e) {
    const { router } = this.context
    router.push('/starred')
  }

  handleToggleButtonClick (e) {
    const { dispatch, config } = this.props

    ConfigManager.set({isSideNavFolded: !config.isSideNavFolded})
    dispatch({
      type: 'SET_IS_SIDENAV_FOLDED',
      isFolded: !config.isSideNavFolded
    })
  }

  handleTrashedButtonClick (e) {
    const { router } = this.context
    router.push('/trashed')
  }

  handleSwitchFoldersButtonClick () {
    const { router } = this.context
    router.push('/home')
  }

  handleSwitchTagsButtonClick () {
    const { router } = this.context
    router.push('/alltags')
  }

  onSortEnd (storage) {
    return ({oldIndex, newIndex}) => {
      const { dispatch } = this.props
      dataApi
        .reorderFolder(storage.key, oldIndex, newIndex)
        .then((data) => {
          dispatch({ type: 'REORDER_FOLDER', storage: data.storage })
        })
    }
  }

  SideNavComponent (isFolded, storageList) {
    const { location, data, config } = this.props

    const isHomeActive = !!location.pathname.match(/^\/home$/)
    const isStarredActive = !!location.pathname.match(/^\/starred$/)
    const isTrashedActive = !!location.pathname.match(/^\/trashed$/)

    let component

    // TagsMode is not selected
    if (!location.pathname.match('/tags') && !location.pathname.match('/alltags')) {
      component = (
        <div>
          <SideNavFilter
            isFolded={isFolded}
            isHomeActive={isHomeActive}
            handleAllNotesButtonClick={(e) => this.handleHomeButtonClick(e)}
            isStarredActive={isStarredActive}
            isTrashedActive={isTrashedActive}
            handleStarredButtonClick={(e) => this.handleStarredButtonClick(e)}
            handleTrashedButtonClick={(e) => this.handleTrashedButtonClick(e)}
            counterTotalNote={data.noteMap._map.size - data.trashedSet._set.size}
            counterStarredNote={data.starredSet._set.size}
            counterDelNote={data.trashedSet._set.size}
            handleFilterButtonContextMenu={this.handleFilterButtonContextMenu.bind(this)}
          />

          <StorageList storageList={storageList} isFolded={isFolded} />
          <NavToggleButton isFolded={isFolded} handleToggleButtonClick={this.handleToggleButtonClick.bind(this)} />
        </div>
      )
    } else {
      component = (
        <div styleName='tabBody'>
          <div styleName='tag-control'>
            <div styleName='tag-control-title'>
              <p>{i18n.__('Tags')}</p>
            </div>
            <div styleName='tag-control-sortTagsBy'>
              <i className='fa fa-angle-down' />
              <select styleName='tag-control-sortTagsBy-select'
                title={i18n.__('Select filter mode')}
                value={config.sortTagsBy}
                onChange={(e) => this.handleSortTagsByChange(e)}
              >
                <option title='Sort alphabetically'
                  value='ALPHABETICAL'>{i18n.__('Alphabetically')}</option>
                <option title='Sort by update time'
                  value='COUNTER'>{i18n.__('Counter')}</option>
              </select>
            </div>
          </div>
          <div styleName='tagList'>
            {this.tagListComponent(data)}
          </div>
        </div>
      )
    }

    return component
  }

  tagListComponent () {
    const { data, location, config } = this.props
    const relatedTags = this.getRelatedTags(this.getActiveTags(location.pathname), data.noteMap)
    let tagList = _.sortBy(data.tagNoteMap.map(
      (tag, name) => ({ name, size: tag.size, related: relatedTags.has(name) })
    ), ['name']).filter(
      tag => tag.size > 0
    )
    if (config.sortTagsBy === 'COUNTER') {
      tagList = _.sortBy(tagList, item => (0 - item.size))
    }
    if (config.ui.showOnlyRelatedTags && (relatedTags.size > 0)) {
      tagList = tagList.filter(
        tag => tag.related
      )
    }
    return (
      tagList.map(tag => {
        return (
          <TagListItem
            name={tag.name}
            handleClickTagListItem={this.handleClickTagListItem.bind(this)}
            handleClickNarrowToTag={this.handleClickNarrowToTag.bind(this)}
            isActive={this.getTagActive(location.pathname, tag.name)}
            isRelated={tag.related}
            key={tag.name}
            count={tag.size}
          />
        )
      })
    )
  }

  getRelatedTags (activeTags, noteMap) {
    if (activeTags.length === 0) {
      return new Set()
    }
    const relatedNotes = noteMap.map(
      note => ({key: note.key, tags: note.tags})
    ).filter(
      note => activeTags.every(tag => note.tags.includes(tag))
    )
    const relatedTags = new Set()
    relatedNotes.forEach(note => note.tags.map(tag => relatedTags.add(tag)))
    return relatedTags
  }

  getTagActive (path, tag) {
    return this.getActiveTags(path).includes(tag)
  }

  getActiveTags (path) {
    const pathSegments = path.split('/')
    const tags = pathSegments[pathSegments.length - 1]
    return (tags === 'alltags')
      ? []
      : tags.split(' ').map(tag => decodeURIComponent(tag))
  }

  handleClickTagListItem (name) {
    const { router } = this.context
    router.push(`/tags/${encodeURIComponent(name)}`)
  }

  handleSortTagsByChange (e) {
    const { dispatch } = this.props

    const config = {
      sortTagsBy: e.target.value
    }

    ConfigManager.set(config)
    dispatch({
      type: 'SET_CONFIG',
      config
    })
  }

  handleClickNarrowToTag (tag) {
    const { router } = this.context
    const { location } = this.props
    const listOfTags = this.getActiveTags(location.pathname)
    const indexOfTag = listOfTags.indexOf(tag)
    if (indexOfTag > -1) {
      listOfTags.splice(indexOfTag, 1)
    } else {
      listOfTags.push(tag)
    }
    router.push(`/tags/${listOfTags.map(tag => encodeURIComponent(tag)).join(' ')}`)
  }

  emptyTrash (entries) {
    const { dispatch } = this.props
    const deletionPromises = entries.map((note) => {
      return dataApi.deleteNote(note.storage, note.key)
    })
    Promise.all(deletionPromises)
    .then((arrayOfStorageAndNoteKeys) => {
      arrayOfStorageAndNoteKeys.forEach(({ storageKey, noteKey }) => {
        dispatch({ type: 'DELETE_NOTE', storageKey, noteKey })
      })
    })
    .catch((err) => {
      console.error('Cannot Delete note: ' + err)
    })
    console.log('Trash emptied')
  }

  handleFilterButtonContextMenu (event) {
    const { data } = this.props
    const trashedNotes = data.trashedSet.toJS().map((uniqueKey) => data.noteMap.get(uniqueKey))
    context.popup([
      { label: i18n.__('Empty Trash'), click: () => this.emptyTrash(trashedNotes) }
    ])
  }

  render () {
    const { data, location, config, dispatch } = this.props

    const isFolded = config.isSideNavFolded

    const storageList = data.storageMap.map((storage, key) => {
      const SortableStorageItem = SortableContainer(StorageItem)
      return <SortableStorageItem
        key={storage.key}
        storage={storage}
        data={data}
        location={location}
        isFolded={isFolded}
        dispatch={dispatch}
        onSortEnd={this.onSortEnd.bind(this)(storage)}
        useDragHandle
      />
    })
    const style = {}
    if (!isFolded) style.width = this.props.width
    const isTagActive = location.pathname.match(/tag/)
    return (
      <div className='SideNav'
        styleName={isFolded ? 'root--folded' : 'root'}
        tabIndex='1'
        style={style}
      >
        <div styleName='top'>
          <div styleName='switch-buttons'>
            <ListButton onClick={this.handleSwitchFoldersButtonClick.bind(this)} isTagActive={isTagActive} />
            <TagButton onClick={this.handleSwitchTagsButtonClick.bind(this)} isTagActive={isTagActive} />
          </div>
          <div>
            <PreferenceButton onClick={this.handleMenuButtonClick} />
          </div>
        </div>
        {this.SideNavComponent(isFolded, storageList)}
      </div>
    )
  }
}

SideNav.contextTypes = {
  router: PropTypes.shape({})
}

SideNav.propTypes = {
  dispatch: PropTypes.func,
  storages: PropTypes.array,
  config: PropTypes.shape({
    isSideNavFolded: PropTypes.bool
  }),
  location: PropTypes.shape({
    pathname: PropTypes.string
  })
}

export default CSSModules(SideNav, styles)