begin
  require 'rubygems'
rescue LoadError
end

require 'lotu'
include Lotu

require 'silo'
require 'explosion'
require 'missile'
require 'cross_hair'

class MissileCommand < Game

  def initialize
    super
    setup_events
    @info = TextBox.new(:size => 15)
    @info.text("Press F1 to hide this text | F2 debug info | F3 toggle pause", :size => 24)
    @info.watch(@systems[FpsSystem], :size => 20)
    @info.watch(@systems[StalkerSystem], :color => 0xff33ccff)
    @info.text("Click on screen to launch some missiles!")
  end

  def load_resources
    with_path_from_file(__FILE__) do
      load_images 'media/images'
      load_sounds 'media/sounds'
      load_animations 'media/animations'
    end
  end

  def setup_input
    set_keys(Gosu::KbEscape => :close,
             Gosu::KbF1 => [:toggle_info, false],
             Gosu::KbF2 => [:debug!, false],
             Gosu::KbF3 => [:pause!, false])
  end

  def setup_systems
    # It's important to call super here to setup the InputSystem
    super
    use(CollisionSystem)
    use(FpsSystem)
    use(StalkerSystem, :stalk => [Actor, Silo, Missile, Explosion, TextBox, Object])
  end

  def setup_actors
    @player = Silo.new(:x => width/2,
                       :width => 100,
                       :stock => 10000,
                       :platform_capacity => 4,
                       :load_time => 0.1,
                       :speed => 100,
                       :missile_speed => 1000,
                       :missile_force => 1000,
                       :missile_mass => 0.5)
    @player.set_keys(Gosu::KbA => :move_left,
                     Gosu::KbD => :move_right)

    @cross_hair = CrossHair.new(:keys => {Gosu::MsLeft => [:click, false], Gosu::MsRight => :click},
                                :rand_color => true,
                                :mode => :additive,
                                :width => 100)

    @silo_info = TextBox.new(:attach_to => @player, :size => 14)
    @silo_info.watch(@player)
  end

  def setup_events
    @cross_hair.on :click do |x, y|
      @player.launch_missile(x, y)
    end

    when_colliding(:explosion, :missile) do |e, m|
      m.die
    end
  end

  def toggle_info
    @info.toggle!
    @silo_info.toggle!
  end

end