dobtco/procure-io

_.extend Backbone.View.prototype,
  onClick: (e) ->
    return if $(e.currentTarget).hasClass 'disabled'
    @callMethodIfExists $(e.currentTarget).data('backbone-click'), e

  onSubmit: (e) ->
    e.preventDefault()
    @callMethodIfExists $(e.currentTarget).data('backbone-submit'), e

  onFocus: (e) ->
    @callMethodIfExists $(e.currentTarget).data('backbone-focus'), e

  onInput: (e) ->
    @callMethodIfExists $(e.currentTarget).data('backbone-input'), e

  callMethodIfExists: (methodName, e) ->
    @[methodName]?(e, $(e.currentTarget), $(e.currentTarget).data('backbone-params'))

  delegateEvents: (events) ->
    delegateEventSplitter = /^(\S+)\s*(.*)$/

    events ||= _.result(this, "events") || {}

    _.extend events,
      "click [data-backbone-click]": "onClick"
      "submit [data-backbone-submit]": "onSubmit"
      "focus [data-backbone-focus]": "onFocus"
      "input [data-backbone-input]": "onInput"

    @undelegateEvents()

    for key of events
      method = events[key]
      method = this[events[key]]  unless _.isFunction(method)
      throw new Error("Method \"" + events[key] + "\" does not exist")  unless method
      match = key.match(delegateEventSplitter)
      eventName = match[1]
      selector = match[2]
      method = _.bind(method, this)
      eventName += ".delegateEvents" + @cid
      if selector is ""
        @$el.on eventName, method
      else
        @$el.on eventName, selector, method