class Locmare.ListGroupModule.LibModule.Pager
  @factory: (page_status, params) ->
    pagers = {
      default: Locmare.ListGroupModule.LibModule.PagerModule.Default,
      offset: Locmare.ListGroupModule.LibModule.PagerModule.Offset,
      unlimited: Locmare.ListGroupModule.LibModule.PagerModule.Unlimited,
      more: Locmare.ListGroupModule.LibModule.PagerModule.More
    }
    c = pagers[page_status.type]
    return null if not page_status.total_page
    new c({page_status: page_status, params: params})
  
class Locmare.ListGroupModule.LibModule.PagerModule
class Locmare.ListGroupModule.LibModule.PagerModule.Default extends Backbone.View
  tagName: 'ul'
  className: 'pagination'
  
  initialize: (options) ->
    @page_status = options.page_status
    @params = options.params
    @total = @page_status.total
    
    @window_size = 3
    @controller = Manifest.manifest().controllers[@params['controller']]
    @action = @controller.actions[@params['action']]
    @action = @action.original if @action.original
    
    @current_page = @page_status.page
    @per_page = @page_status.page_size
    @total_page = @page_status.total_page
  
  render: () ->
    this.$el.html('')
    if @hasPreviousPage()
      view = new Locmare.ListGroupModule.LibModule.PagerModule.FirstPage({
        parent: this, page: 1, class_name: 'first'
      })
      @listenTo(view, 'navigate', @navigate)
      @listenTo(view, 'page', @click)
      this.$el.append(view.render().el)
    if @hasPreviousPage()
      view = new Locmare.ListGroupModule.LibModule.PagerModule.PrevPage({
        parent: this, page: @current_page - 1, class_name: 'prev'
      })
      @listenTo(view, 'navigate', @navigate)
      @listenTo(view, 'page', @click)
      this.$el.append(view.render().el)
    if @hasPreviousPageGap()
      this.$el.append(
        (new Locmare.ListGroupModule.LibModule.PagerModule.PageGap()).render().el
      )
    _.each @range(), (page) =>
      view = new Locmare.ListGroupModule.LibModule.PagerModule.Page({
        parent: this, page: page, class_name: 'page'
      })
      @listenTo(view, 'navigate', @navigate)
      @listenTo(view, 'page', @click)
      this.$el.append(view.render().el)
    if @hasNextPageGap()
      this.$el.append(
        (new Locmare.ListGroupModule.LibModule.PagerModule.PageGap()).render().el
      )
    if @hasNextPage()
      view = new Locmare.ListGroupModule.LibModule.PagerModule.NextPage({
        parent: this, page: @current_page + 1, class_name: 'next'
      })
      @listenTo(view, 'navigate', @navigate)
      @listenTo(view, 'page', @click)
      this.$el.append(view.render().el)
    if @hasNextPage()
      view = new Locmare.ListGroupModule.LibModule.PagerModule.LastPage({
        parent: this, page: @total_page, class_name: 'last'
      })
      @listenTo(view, 'navigate', @navigate)
      @listenTo(view, 'page', @click)
      this.$el.append(view.render().el)
    rb = new Tag.RowBreak()
    this.$el.append(rb.render().el)
    this
  
  range: () ->
    f = if @hasPreviousPageGap()
      @current_page - @window_size
    else
      1
    t = if @hasNextPageGap()
      @current_page + @window_size
    else
      @total_page
    _.range(f, t)
  
  hasPreviousPage: () ->
    @current_page > 1
  
  hasNextPage: () ->
    @current_page < @total_page
  
  hasPreviousPageGap: () ->
    @current_page > @window_size + 1
  
  hasNextPageGap: () ->
    @total_page - @current_page > @window_size
  
  url: (page) ->
    params = {}
    _.each @params, (v, k) ->  # deep copy
      params[k] = v
    params['page'] = page
    params['page_size'] = @per_page
    @action.url params
  
  click: (page) ->
    @trigger('page', page)
  
  navigate: (url) ->
    @trigger('http_get', url)
  
class Locmare.ListGroupModule.LibModule.PagerModule.Part extends Backbone.View
  tagName: 'li'
  
  initialize: (options) ->
    @parent = options.parent
    @page = options.page
    @el.className = options.class_name
  
  render: () ->
    if @page == @parent.current_page
      this.$el.html(@content())
    else
      linked_caption = new Tag.A({
        attr: {href: '/' + @url()}, 
        content: @content()
      })
      @listenTo(linked_caption, 'click', @click)
      this.$el.html(linked_caption.render().el)
    this
  
  content: () ->
    ''
  
  url: () ->
    @parent.url(@page)
  
  click: () ->
    @trigger('page', @page)
    @trigger('navigate', @url())
  
class Locmare.ListGroupModule.LibModule.PagerModule.FirstPage extends Locmare.ListGroupModule.LibModule.PagerModule.Part
  
  content: () ->
    '<<'
  
  click: () ->
    @trigger('page', @page)
    @trigger('navigate', @url())
  
class Locmare.ListGroupModule.LibModule.PagerModule.PrevPage extends Locmare.ListGroupModule.LibModule.PagerModule.Part
  
  content: () ->
    '<'
  
class Locmare.ListGroupModule.LibModule.PagerModule.PageGap extends Backbone.View
  tagName: 'li'
  className: 'page-gap'
  
  render: () ->
    this.$el.html('...')
    this
  
class Locmare.ListGroupModule.LibModule.PagerModule.Page extends Locmare.ListGroupModule.LibModule.PagerModule.Part
  
  content: () ->
    Pettanr.to_s(@page)
  
class Locmare.ListGroupModule.LibModule.PagerModule.NextPage extends Locmare.ListGroupModule.LibModule.PagerModule.Part
  
  content: () ->
    '>'
  
class Locmare.ListGroupModule.LibModule.PagerModule.LastPage extends Locmare.ListGroupModule.LibModule.PagerModule.Part
  
  content: () ->
    '>>'
  
class Locmare.ListGroupModule.LibModule.PagerModule.More extends Backbone.View
  tagName: 'div'
  className: 'pagination'
  
  initialize: (options) ->
    @params = options.params
    
    @controller = Manifest.manifest().controllers[@params['controller']]
    @action = @controller.actions[@params['action']]
    @action = @action.original if @action.original
  
  render: () ->
    this.$el.html('')
    linked_caption = new Tag.A({
      attr: {href: '/' + @url()}, 
      content: 'More...'
    })
    @listenTo(linked_caption, 'click', @click)
    this.$el.html(linked_caption.render().el)
    this
  
  url: () ->
    @action.url @params
  
  click: () ->
    @trigger('http_get', @url())