class Tram.Message extends Backbone.Model
  defaults: ->
    stamp: new Date()
  initialize: ->
    @on 'add change:stamp', ->
      @set('d/mstamp', moment(@get('stamp')))
class Tram.Messages extends Backbone.Collection
  model: Tram.Message
  splitThreshold: 30 * 60 * 1000
  foldThreshold: 60 * 1000
  comparator: (model) ->
    model.get('stamp').valueOf()
  initialize: ->
    @on('add', @onAdd)
  onAdd: (model) ->
    mi = @indexOf(model)
    prev = @models[mi - 1]
    @_splitOrFold(prev, model)
    next = @models[mi + 1]
    @_splitOrFold(model, next)
  _splitOrFold: (m1, m2) ->
    if not m2?
      return
    if not m1?
      m2.unset('d/split')
      m2.unset('d/fold')
      return
    if @_splittable(m1, m2)
      m2.set('d/split', true)
    else
      m2.unset('d/split')
      if @_foldable(m1, m2)
        m2.set('d/fold', true)
      else
        m2.unset('d/fold')
  _splittable: (m1, m2) ->
    Math.abs(m1.get('stamp').valueOf() - m2.get('stamp').valueOf()) > @splitThreshold
  _foldable: (m1, m2) ->
    # check stamp, type, etc
    m1.get('from') is m2.get('from') and Math.abs(m1.get('stamp').valueOf() - m2.get('stamp').valueOf()) < @foldThreshold
class Tram.MessageView extends Backbone.View
  templateEl: $($('#message-template').html())
  initialize: ->
    @setElement(@templateEl.clone())
    @$avatarColumn = @$('.avatar-column')
    @bind()
  bind: ->
    @listenTo(@model, 'change:contact', @updateContact)
  updateContact: ->
    if not @model.previous('contact')? and @model.get('contact')?
      @av = new Tram.AvatarView(model: contact)
      @$avatarColumn.prepend(@av.render().el)
  render: (model) ->
    @rivet = rivets.bind(@el, message: @model, view: @)
    contact = @model.get('contact')
    if contact
      @av = new Tram.AvatarView(model: contact)
      @$avatarColumn.prepend(@av.render().el)
    @
  remove: ->
    @av?.remove()
    @rivet.unbind()
    super
class Tram.LogApp extends Backbone.View
  templateEl: $($('#chat-template').html())
  initialize: ->
    @setElement(@templateEl.clone())
    @$log = @$('.log')
    @rivet = rivets.bind(@el, model: @model, view: @)
    @bind()
  bind: ->
    @listenTo(@collection, 'add', @onAdd)
  onAdd: (model, collection) ->
    bottomed = @bottomed()
    mi = collection.indexOf(model)
    view = new Tram.MessageView(model: model)
    el = view.render().el
    if mi is 0
      @$log.prepend(el)
    else
      @$log.children().eq(mi - 1).after(el)
    if bottomed
      @scroll()
  bottomed: ->
    @$el.scrollTop() + @$el.innerHeight() == @el.scrollHeight
  scroll: ->
    @$el.scrollTop(@el.scrollHeight)
  remove: ->
    @rivet.unbind()
    super