class Animator

  def initialize(target)
    @animator_set = Java::android.animation.AnimatorSet.new
    @mode = :together
    @animators = []
    @target = target
    @done = false
  end

  def animator_set
    @animator_set
  end

  def animators
    @animators
  end

  def native
    @animator_set
  end

  def method_missing(name, *args, &block)
    anim = Java::android.animation.ObjectAnimator.ofFloat(@target.native, name.to_s.camelize(:lower), args[0], args[1]);
    if args[2] && args[2].kind_of?(Hash)
      duration = args[2][:duration]
      anim.setDuration(duration)
    end
    @animators << anim
    anim
  end

  def sequentially
    @mode = :one_after_the_other
    self
  end

  def together
    @mode = :together
    self
  end

  def before(animation)
    Java::android.animation.AnimatorSet.new.tap { |s|
      s.play(to_animator(animation)).before(self.animator_set)
    } if @done
  end

  def after(animation)
    s = Java::android.animation.AnimatorSet.new.tap { |s|
      s.play(to_animator(animation)).after(self.animator_set)
    } if @done
  end

  def wait(milliseconds)
    Java::android.animation.AnimatorSet.new.tap { |s|
      s.play(self.animator_set).after(milliseconds.to_i)
    } if @done
  end

  def with(animation)
    Java::android.animation.AnimatorSet.new.tap { |s|
      s.play(to_animator(animation)).with(self.animator_set)
    } if @done
  end

  def together
    @mode = :together
  end

  def one_after_the_other
    @mode = :one_after_the_other
  end

  def done
    @done = true
    case @mode
    when :together
      @animator_set.playTogether(*@animators)
    when :one_after_the_other
      @animator_set.playSequentially(*@animators)
    end
  end

  def start
    @animator_set.start
    self
  end

  def on(event, &block)
    @animation_listener = @animation_listener || AnimatorListenerWrapper.new
    if [:cancel, :start, :end, :repeat ].include?(event)
      @animation_listener.set_block(event, &Proc.new { |v| block.call(wrap_native_view(v))})
      self.native.addListener(@animation_listener.to_native)
    end
    self
  end

  protected

  def to_animator(animation)
    animator = animation
    if animation.kind_of? Animator
      animator = animation.animator_set
    end
    animator
  end
end