require 'hardware_adapter'
module Devices

  def self.method_missing(method_sym, *arguments, &block)
    devices = Devices.new
    devices.send(method_sym, *arguments, &block)
  end

  class Devices
    def initialize(actuators = Adapter.actuators, sensors = Adapter.sensors)
      @actuators = actuators
      @sensors = sensors
    end

    # display a a message on the specified line on the display
    # the line is a 0 based index in the available lines on the display
    def display_show(line, message)
      actuators.fire(:display_show, line, message)
    end

    # drops a coin in the bin where:
    # coin is 50 100 or 200 cts
    def cash_drop_coin(coin)
      actuators.fire(:"cash_drop_#{coin}")
    end

    # register a handler on filling coin of a specific 
    # kind in the cash register
    def on_cash_filled(coin, &block) 
      sensors.on(:"cash_fill_#{coin}", &block)
    end

    # register a handler on inserting a specifica coin 
    # in the cash register as part of paying
    def on_cash_inserted(coin, &block) 
      sensors.on(:"cash_insert_#{coin}", &block)
    end

    # register a handler on getting something being dropped in the bin
    def on_bin_entry(&block)
      sensors.on(:bin_entry, &block)
    end

    # register a handler on sbdy getting stuff from the bin
    def on_bin_fetch_all(&block)
      sensors.on(:bin_fetch_all, &block)
    end

    # register a handleer on sbgy pressing a specific button 
    # where button can be one of 0 1 2 or three
    def on_button_pressed(button, &block)
      sensors.on(:"button_press_#{button}", &block)
    end

    # drops a can from a specified drawer
    def drawer_drop_can(drawer)
      actuators.fire(:"drawer_drop_can_#{drawer}")
    end

    # register a handler on a drawer dropping a can
    def on_drawer_dropped(drawer, &block)
      sensors.on(:"drawer_drop_can_#{drawer}", &block)
    end

    # register a handler on a drawer being filled with a can
    def on_drawer_filled(drawer, &block)
      sensors.on(:"drawer_fill_can_#{drawer}", &block)
    end

    private 
    attr_reader :actuators, :sensors
  end
end