_ = require 'underscore-plus'
React = require 'react'
{ListTabular, Spinner} = require 'ui-components'
{timestamp, subject} = require './formatting-utils'
{Actions,
 Utils,
 ThreadStore,
 WorkspaceStore,
 NamespaceStore} = require 'inbox-exports'

ThreadListParticipants = require './thread-list-participants'

module.exports =
ThreadList = React.createClass
  displayName: 'ThreadList'

  getInitialState: ->
    @_getStateFromStores()
 
  componentDidMount: ->
    @thread_store_unsubscribe = ThreadStore.listen @_onChange
    @thread_unsubscriber = atom.commands.add '.thread-list', {
      'thread-list:star-thread': => @_onStarThread()
    }
    @body_unsubscriber = atom.commands.add 'body', {
      'application:previous-item': => @_onShiftSelectedIndex(-1)
      'application:next-item': => @_onShiftSelectedIndex(1)
      'application:focus-item': => @_onFocusSelectedIndex()
      'application:remove-item': @_onArchiveCurrentThread
      'application:remove-and-previous': -> Actions.archiveAndPrevious()
      'application:remove-and-next': -> Actions.archiveAndNext()
      'application:reply': @_onReply
      'application:reply-all': @_onReplyAll
      'application:forward': @_onForward
    }

  componentWillUnmount: ->
    @thread_store_unsubscribe()
    @thread_unsubscriber.dispose()
    @body_unsubscriber.dispose()

  render: ->
    classes = React.addons.classSet("thread-list": true, "ready": @state.ready)
    <div className={classes}>
      <ListTabular
        columns={@state.columns}
        items={@state.items}
        itemClassProvider={ (item) -> if item.isUnread() then 'unread' else '' }
        selectedId={@state.selectedId}
        onSelect={ (item) -> Actions.selectThreadId(item.id) } />
      <Spinner visible={!@state.ready} />
    </div>

  _computeColumns: ->
    myEmail = NamespaceStore.current()?.emailAddress

    labelComponents = (thread) =>
      for label in @state.threadLabelComponents
        LabelComponent = label.view
        <LabelComponent thread={thread} />

    lastMessageType = (thread) ->
      msgs = thread.messageMetadata
      return 'unknown' unless msgs and msgs instanceof Array and msgs.length > 0
      msg = msgs[msgs.length - 1]
      if thread.unread
        return 'unread'
      else if msg.from[0].email isnt myEmail
        return 'other'
      else if Utils.isForwardedMessage(msg)
        return 'forwarded'
      else
        return 'replied'

    c1 = new ListTabular.Column
      name: "★"
      resolver: (thread) ->
        <div className="thread-icon thread-icon-#{lastMessageType(thread)}"></div>

    c2 = new ListTabular.Column
      name: "Name"
      flex: 1
      resolver: (thread) ->
        <ThreadListParticipants thread={thread} />

    c3 = new ListTabular.Column
      name: "Message"
      flex: 4
      resolver: (thread) ->
        attachments = []
        if thread.hasTagId('attachment')
          attachments = <div className="thread-icon thread-icon-attachment"></div>
        <span className="details">
          <span className="subject">{subject(thread.subject)}</span>
          <span className="snippet">{thread.snippet}</span>
          {attachments}
        </span>

    c4 = new ListTabular.Column
      name: "Date"
      resolver: (thread) ->
        <span className="timestamp">{timestamp(thread.lastMessageTimestamp)}</span>

    [c1, c2, c3, c4]

  _onFocusSelectedIndex: ->
    Actions.selectThreadId(@state.selectedId)

  _onShiftSelectedIndex: (delta) ->
    item = _.find @state.items, (thread) => thread.id == @state.selectedId
    index = if item then @state.items.indexOf(item) else -1
    index = Math.max(0, Math.min(index + delta, @state.items.length-1))
    Actions.selectThreadId(@state.items[index].id)

  _onStarThread: ->
    thread = ThreadStore.selectedThread()
    thread.toggleStar() if thread

  _onReply: ->
    return unless @state.selectedId? and @_actionInVisualScope()
    Actions.composeReply(threadId: @state.selectedId)

  _onReplyAll: ->
    return unless @state.selectedId? and @_actionInVisualScope()
    Actions.composeReplyAll(threadId: @state.selectedId)

  _onForward: ->
    return unless @state.selectedId? and @_actionInVisualScope()
    Actions.composeForward(threadId: @state.selectedId)

  _actionInVisualScope: ->
    if WorkspaceStore.selectedLayoutMode() is "list"
      WorkspaceStore.sheet().type is "Thread"
    else true

  _onArchiveCurrentThread: ->
    if WorkspaceStore.selectedLayoutMode() is "list"
      Actions.archiveCurrentThread()
    else if WorkspaceStore.selectedLayoutMode() is "split"
      Actions.archiveAndNext()

  _onChange: ->
    @setState(@_getStateFromStores())

  _getStateFromStores: ->
    ready: not ThreadStore.itemsLoading()
    items: ThreadStore.items()
    columns: @_computeColumns()
    selectedId: ThreadStore.selectedId()