_ = require 'underscore'

module.exports = (objs, options = {}) ->
  objs.CollectionView = class CollectionView extends objs.CollectionView
    # 分页使用，当前是第几页
    page: 1
    # 分页使用，每页显示多少条
    pageSize: 10
    # 分页使用，分页的视图
    PaginationView: require('./views/pagination-view')(options)
    # 分页左侧间隔多少个
    paginationLeftIntval: 3
    # 分页右侧间隔多少个
    paginationRightIntval: 3
    # 是否客户端分页
    isClientPaginate: no

    listen:
      "sync collection": "handlePagination"
      'addedToDOM': 'addedToDOM'

    addedToDOM: ->
      return

    hide: ->
      @$el.addClass('hidden')
    show: ->
      @$el.removeClass('hidden')


    handlePagination: (collection, models, response) ->
      return if not @PaginationView
      # 记录原始的数据，用于前端检索和分页
      @origModels = models
      # 记录可见的数据，用于前端检索
      @visableModels = models
      @total = @getRecordTotal(response.xhr)
      return if not @total or @total <= @pageSize
      @pagination()

    getRecordTotal: (xhr) ->
      return @visableModels.length if @isClientPaginate
      utils.intval xhr.getResponseHeader('X-Content-Record-Total')

    # 客户端分页执行函数
    clientPaginate: ->
      startIndex = (@page - 1) * @pageSize
      @collection.reset @visableModels.slice startIndex, startIndex + @pageSize

    pagination: ->
      @total = @visableModels.length if @isClientPaginate
      options =
        total: @total
        page: @page
        left: @paginationLeftIntval
        right: @paginationRightIntval
        size: @pageSize
      model = new Model options
      @paginationView = new @PaginationView
        model: model
        className: 'pagination'
        container: @$ ".pages"

      @paginationView.on 'ChangePage', @changePage
      @clientPaginate() if @isClientPaginate

    # obj 包含 page 和 size 两项
    changePage: (obj) =>
      @_paginationScroll = yes
      @page = obj.page or @page
      @pageSize = obj.size or @pageSize
      return @pagination() if @isClientPaginate
      @collection.options.startIndex = (@page - 1) * @pageSize
      @collection.options.maxResults = @pageSize
      @collection.fetch()