# encoding: utf-8
#
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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module Selenium
  module WebDriver
    #
    # @api private
    # @see ActionBuilder

    class Keyboard
      def initialize(bridge)
        @bridge = bridge
      end

      def send_keys(*keys)
        @bridge.send_keys_to_active_element Keys.encode(keys)
      end

      #
      # Press a modifier key
      #
      # @see Selenium::WebDriver::Keys
      #

      def press(key)
        assert_modifier key

        @bridge.send_keys_to_active_element Keys.encode([key])
      end

      #
      # Release a modifier key
      #
      # @see Selenium::WebDriver::Keys
      #

      def release(key)
        assert_modifier key

        @bridge.send_keys_to_active_element Keys.encode([key])
      end

      private

      MODIFIERS = [:control, :shift, :alt, :command, :meta].freeze

      def assert_modifier(key)
        return if MODIFIERS.include? key
        raise ArgumentError, "#{key.inspect} is not a modifier key, expected one of #{MODIFIERS.inspect}"
      end
    end # Keyboard
  end # WebDriver
end # Selenium
