require 'yaml'

class Configuration
  include Enumerable

  @@config_path = File.expand_path(File.join(File.dirname(__FILE__), '..', 'etc'))

  def initialize(name)
    @config_name = name
  end

  def config_file
    File.join(@@config_path, @config_name)
  end

  def load_config
    STDERR.puts "Reloading configuration"
    @config_hash = indifferent_params(YAML::load(File.open(config_file)))
    @config_time = File.stat(config_file).mtime
  end

  def stale?
    File.stat(config_file).mtime != @config_time
  end

  def config_hash
    load_config if !@config_hash || stale?
    @config_hash
  end

  def each(*args, &block)
    config_hash.each(*args, &block)
  end

  def [](key)
    config_hash[key]
  end

  def indifferent_hash
    Hash.new {|hash,key| hash[key.to_s] if Symbol === key }
  end

  def indifferent_params(object)
    case object
      when Hash
        new_hash = indifferent_hash
        object.each {|key, value| new_hash[key] = indifferent_params(value) }
        new_hash
      when Array
        object.map {|item| indifferent_params(item) }
      else
        object
    end
  end

  def self.load(name)
    new(name)
  end
end