# This is the module that keeps the register of all the Lunetas. It will add the 
# classes to a register, and whenever rack receives a call, it delegates it.
# If Lunetas is not run as a stand alone rack application, then this module
# lacks of responsability, ie. Running as a Rails Metal.
module Lunetas::Bag
  # Registers new classes to a given regular expression. It should be called from
  # a Luneta.
  # @param [Regexp] regex the regular expression for this Luneta Class.
  # @param [Luneta] candy the class that owns the regular expresion.
  def self.register(regex, candy)
    # TODO: Log: "Registering #{regex.inspect} #{candy.inspect}"
    @@candies ||= {}
    @@candies[regex] = candy
  end

  # Rack's call method. Will be called with the env, from rack. If it matches
  # a regular expression, it will start a new instance of the propiertary class.
  # If there's no matching class, it will return a 404.
  #
  # @param [Hash] env the rack's env.
  # @return [Array] the rack response.
  def self.call(env)
    @url_match = nil
    match_regex = @@candies.keys.find do |regex| 
      @url_match = env['PATH_INFO'].match(regex)
    end
    unless match_regex
      return [404, {"Content-Type" => "text/html", "X-Cascade" => "pass"}, ["Not Found"]]
    end
    candy = @@candies[match_regex].new(env, @url_match.to_a)
    candy.bite
  end
end