songkick/dolphin

require 'fileutils'
require 'yaml'

require 'dolphin/helper'
require 'dolphin/feature_store'
require 'dolphin/flipper_store'
require 'dolphin/experiment'

module Dolphin

  def self.configure(&block)
    FlipperStore::DSL.new(flipper_store, &block)
  end

  def self.flipper_store
    @flipper_store ||= FlipperStore.new
  end

  def self.feature_store
    @feature_store
  end
  
  def self.experiment(name, logger=nil, &block)
    experiment = Dolphin::Experiment.new(name, logger, &block)
    experiment.run
  end
  
  def self.init(feature_file)
    @feature_store = FeatureStore.new(feature_file)
  end

  def self.init_with_store(feature_store)
    @feature_store = feature_store
  end

  def self.feature_available?(name)
    if feature_store
      if flipper_name = feature_store[name]
        if flipper = flipper_store[flipper_name]
          instance_eval(&flipper)
        else
          false
        end
      else
        false
      end
    else
      raise "Dolphin has not been initialized with a features file"
    end
  end

  def self.clear
    @flippers = nil
    @feature_store = nil
    @flipper_store = nil
  end
end