module BubbleWrap
  module UIViewWrapper
    def when_tapped(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UITapGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_pinched(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UIPinchGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_rotated(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UIRotationGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_swiped(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UISwipeGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_panned(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UIPanGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_screen_edge_panned(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UIScreenEdgePanGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture:'), enableInteraction, proc)
    end

    def when_pressed(enableInteraction=true, &proc)
      add_gesture_recognizer_helper(UILongPressGestureRecognizer.alloc.initWithTarget(self, action:'handle_gesture_pressed_on_begin:'), enableInteraction, proc)
    end

    def self.deprecated_methods
      %w(whenTapped whenPinched whenRotated whenSwiped whenPanned whenPressed)
    end

    deprecated_methods.each do |method|
      define_method(method) do |enableInteraction = true, &proc|
        NSLog "[DEPRECATED - #{method}] please use #{method.underscore} instead."
        send(method.underscore, enableInteraction, &proc)
      end
    end

    private

    def handle_gesture(recognizer)
      @recognizers[recognizer].call(recognizer)
    end

    def handle_gesture_pressed_on_begin(recognizer)
      if recognizer.state==UIGestureRecognizerStateBegan
        @recognizers[recognizer].call(recognizer)
      end
    end

    # Adds the recognizer and keeps a strong reference to the Proc object.
    def add_gesture_recognizer_helper(recognizer, enableInteraction, proc)
      setUserInteractionEnabled true if enableInteraction && !isUserInteractionEnabled
      self.addGestureRecognizer(recognizer)

      @recognizers = {} unless @recognizers
      proc.weak! if !proc.nil? && BubbleWrap.use_weak_callbacks?
      @recognizers[recognizer] = proc

      recognizer
    end
  end
end