Chaplin         = require 'chaplin'
template        = require './templates/pagination'

module.exports = (options) ->
  class PaginationView extends Chaplin.View
    autoRender: no
    tagName: 'ul'
    containerMethod: 'html'
    template: options.template or template
    events:
      'click li>a': 'changePage'

    initialize: ->
      super
      opt = @model.getAttributes()

      last = Math.ceil opt.total / opt.size
      start = Math.max 1, opt.page - opt.left
      end = Math.min last, start + opt.left + opt.right
      start = Math.max 1, end - opt.left - opt.right

      pages = [start..end]
      @model.set 'prev', opt.page - 1
      @model.set 'next', if opt.page is last then 0 else opt.page + 1
      @model.set 'first', if 1 in pages then 0 else 1
      @model.set 'last', if last in pages then 0 else last

      pages.shift() if 1 not in pages
      pages.pop() if last not in pages
      @model.set 'pages', pages
      @render()

    changePage: (e) ->
      cur = $ e.currentTarget || e
      curPage = @model.get "page"
      page = cur.data "page"
      return if page is undefined or page.length is 0
      page = utils.intval page
      return if curPage is page
      @trigger 'ChangePage', page: page