import React, { PropTypes } from 'react'
import CSSModules from 'browser/lib/CSSModules'
import styles from './NoteList.styl'
import moment from 'moment'
import _ from 'lodash'
import ee from 'browser/main/lib/eventEmitter'
import dataApi from 'browser/main/lib/dataApi'

const { remote } = require('electron')
const { Menu, MenuItem, dialog } = remote

class NoteList extends React.Component {
  constructor (props) {
    super(props)

    this.selectNextNoteHandler = () => {
      console.log('fired next')
      this.selectNextNote()
    }
    this.selectPriorNoteHandler = () => {
      this.selectPriorNote()
    }
    this.focusHandler = () => {
      this.refs.root.focus()
    }

    this.state = {
      range: 0
    }
  }

  componentDidMount () {
    this.refreshTimer = setInterval(() => this.forceUpdate(), 60 * 1000)
    ee.on('list:next', this.selectNextNoteHandler)
    ee.on('list:prior', this.selectPriorNoteHandler)
    ee.on('lost:focus', this.focusHandler)
  }

  componentWillReceiveProps (nextProps) {
    if (nextProps.location.pathname !== this.props.location.pathname) {
      this.resetScroll()
    }
  }

  resetScroll () {
    this.refs.root.scrollTop = 0
    this.setState({
      range: 0
    })
  }

  handleScroll (e) {
    let notes = this.notes

    if (e.target.offsetHeight + e.target.scrollTop > e.target.scrollHeight - 250 && notes.length > this.state.range * 10 + 10) {
      this.setState({
        range: this.state.range + 1
      })
    }
  }

  componentWillUnmount () {
    clearInterval(this.refreshTimer)

    ee.off('list:next', this.selectNextNoteHandler)
    ee.off('list:prior', this.selectPriorNoteHandler)
    ee.off('lost:focus', this.focusHandler)
  }

  componentDidUpdate (prevProps) {
    let { location } = this.props
    if (this.notes.length > 0 && location.query.key == null) {
      let { router } = this.context
      router.replace({
        pathname: location.pathname,
        query: {
          key: this.notes[0].storage + '-' + this.notes[0].key
        }
      })
      return
    }

    // Auto scroll
    if (_.isString(location.query.key) && prevProps.location.query.key !== location.query.key) {
      let targetIndex = _.findIndex(this.notes, (note) => {
        return note != null && note.storage + '-' + note.key === location.query.key
      })
      if (targetIndex > -1) {
        let list = this.refs.root
        let item = list.childNodes[targetIndex]
        if (item == null) return false

        let overflowBelow = item.offsetTop + item.clientHeight - list.clientHeight - list.scrollTop > 0
        if (overflowBelow) {
          list.scrollTop = item.offsetTop + item.clientHeight - list.clientHeight
        }
        let overflowAbove = list.scrollTop > item.offsetTop
        if (overflowAbove) {
          list.scrollTop = item.offsetTop
        }
      }
    }
  }

  selectPriorNote () {
    if (this.notes == null || this.notes.length === 0) {
      return
    }
    let { router } = this.context
    let { location } = this.props

    let targetIndex = _.findIndex(this.notes, (note) => {
      return note.storage + '-' + note.key === location.query.key
    })

    if (targetIndex === 0) {
      return
    }
    targetIndex--
    if (targetIndex < 0) targetIndex = 0

    router.push({
      pathname: location.pathname,
      query: {
        key: this.notes[targetIndex].storage + '-' + this.notes[targetIndex].key
      }
    })
  }

  selectNextNote () {
    if (this.notes == null || this.notes.length === 0) {
      return
    }
    let { router } = this.context
    let { location } = this.props

    let targetIndex = _.findIndex(this.notes, (note) => {
      return note.storage + '-' + note.key === location.query.key
    })

    if (targetIndex === this.notes.length - 1) {
      targetIndex = 0
    } else {
      targetIndex++
      if (targetIndex < 0) targetIndex = 0
      else if (targetIndex > this.notes.length - 1) targetIndex === this.notes.length - 1
    }

    router.push({
      pathname: location.pathname,
      query: {
        key: this.notes[targetIndex].storage + '-' + this.notes[targetIndex].key
      }
    })
    ee.emit('list:moved')
  }

  handleNoteListKeyDown (e) {
    if (e.metaKey || e.ctrlKey) return true

    if (e.keyCode === 65 && !e.shiftKey) {
      e.preventDefault()
      ee.emit('top:new-note')
    }

    if (e.keyCode === 68) {
      e.preventDefault()
      ee.emit('detail:delete')
    }

    if (e.keyCode === 69) {
      e.preventDefault()
      ee.emit('detail:focus')
    }

    if (e.keyCode === 38) {
      e.preventDefault()
      this.selectPriorNote()
    }

    if (e.keyCode === 40) {
      e.preventDefault()
      this.selectNextNote()
    }
  }

  getNotes () {
    let { data, params, location } = this.props

    if (location.pathname.match(/\/home/)) {
      return data.noteMap.map((note) => note)
    }

    if (location.pathname.match(/\/starred/)) {
      return data.starredSet.toJS()
        .map((uniqueKey) => data.noteMap.get(uniqueKey))
    }

    let storageKey = params.storageKey
    let folderKey = params.folderKey
    let storage = data.storageMap.get(storageKey)
    if (storage == null) return []

    let folder = _.find(storage.folders, {key: folderKey})
    if (folder == null) {
      let storageNoteSet = data.storageNoteMap
        .get(storage.key)
      if (storageNoteSet == null) storageNoteSet = []
      return storageNoteSet
        .map((uniqueKey) => data.noteMap.get(uniqueKey))
    }

    let folderNoteKeyList = data.folderNoteMap
      .get(storage.key + '-' + folder.key)

    return folderNoteKeyList != null
      ? folderNoteKeyList
        .map((uniqueKey) => data.noteMap.get(uniqueKey))
      : []
  }

  handleNoteClick (e, uniqueKey) {
    let { router } = this.context
    let { location } = this.props

    router.push({
      pathname: location.pathname,
      query: {
        key: uniqueKey
      }
    })
  }

  handleNoteContextMenu (e, uniqueKey) {
    let menu = new Menu()
    menu.append(new MenuItem({
      label: 'Delete Note',
      click: (e) => this.handleDeleteNote(e, uniqueKey)
    }))
    menu.popup()
  }

  handleDeleteNote (e, uniqueKey) {
    let index = dialog.showMessageBox(remote.getCurrentWindow(), {
      type: 'warning',
      message: 'Delete a note',
      detail: 'This work cannot be undone.',
      buttons: ['Confirm', 'Cancel']
    })
    if (index === 0) {
      let { dispatch, location } = this.props
      let splitted = uniqueKey.split('-')
      let storageKey = splitted.shift()
      let noteKey = splitted.shift()

      dataApi
        .deleteNote(storageKey, noteKey)
        .then((data) => {
          let dispatchHandler = () => {
            dispatch({
              type: 'DELETE_NOTE',
              storageKey: data.storageKey,
              noteKey: data.noteKey
            })
          }

          if (location.query.key === uniqueKey) {
            ee.once('list:moved', dispatchHandler)
            ee.emit('list:next')
          } else {
            dispatchHandler()
          }
        })
    }
  }

  render () {
    let { location, data, notes } = this.props
    this.notes = notes = this.getNotes()
      .sort((a, b) => new Date(b.updatedAt) - new Date(a.updatedAt))

    let noteList = notes.slice(0, 10 + 10 * this.state.range)
      .map((note) => {
        if (note == null) return null
        let storage = data.storageMap.get(note.storage)
        let folder = _.find(storage.folders, {key: note.folder})
        let tagElements = _.isArray(note.tags)
          ? note.tags.map((tag) => {
            return (
              <span styleName='item-tagList-item'
                key={tag}>
                {tag}
              </span>
            )
          })
          : []
        let isActive = location.query.key === note.storage + '-' + note.key
        return (
          <div styleName={isActive
              ? 'item--active'
              : 'item'
            }
            key={note.storage + '-' + note.key}
            onClick={(e) => this.handleNoteClick(e, note.storage + '-' + note.key)}
            onContextMenu={(e) => this.handleNoteContextMenu(e, note.storage + '-' + note.key)}
          >
            <div styleName='item-border'/>
            <div styleName='item-info'>

              <div styleName='item-info-left'>
                <span styleName='item-info-left-folder'
                  style={{borderColor: folder.color}}
                >
                  {folder.name}
                  <span styleName='item-info-left-folder-surfix'>in {storage.name}</span>
                </span>
              </div>

              <div styleName='item-info-right'>
                {moment(note.updatedAt).fromNow()}
              </div>

            </div>

            <div styleName='item-title'>
              {note.type === 'SNIPPET_NOTE'
                ? <i styleName='item-title-icon' className='fa fa-fw fa-code'/>
                : <i styleName='item-title-icon' className='fa fa-fw fa-file-text-o'/>
              }
              {note.title.trim().length > 0
                ? note.title
                : <span styleName='item-title-empty'>Empty</span>
              }
            </div>

            <div styleName='item-tagList'>
              <i styleName='item-tagList-icon'
                className='fa fa-tags fa-fw'
              />
              {tagElements.length > 0
                ? tagElements
                : <span styleName='item-tagList-empty'>Not tagged yet</span>
              }
            </div>
          </div>
        )
      })

    return (
      <div className='NoteList'
        styleName='root'
        ref='root'
        tabIndex='-1'
        onKeyDown={(e) => this.handleNoteListKeyDown(e)}
        style={this.props.style}
        onScroll={(e) => this.handleScroll(e)}
      >
        {noteList}
      </div>
    )
  }
}
NoteList.contextTypes = {
  router: PropTypes.shape([])
}

NoteList.propTypes = {
  dispatch: PropTypes.func,
  repositories: PropTypes.array,
  style: PropTypes.shape({
    width: PropTypes.number
  })
}

export default CSSModules(NoteList, styles)