module BigBench
  
  # The configuration is configured in the test reciepts and looks like this:
  #
  #    BigBench.configure do |config|
  #      config.duration    = 10.seconds,
  #      config.output      = "test.ljson",
  #      config.users       = 20,
  #      config.basic_auth  = ['username', 'secret']
  #    end
  # 
  # Single values can be set and retrieved like this:
  # 
  #    BigBench.config.duration = 20.minutes
  #    BigBench.config.duration # => 1200 (seconds)
  # 
  # The following configuration values are possible - stared configurations need to be present:
  #
  # [duration*]   How long will the benchmark take by default. This value can be overridden by every benchmark.
  # [output*]     The file where the results should be written to. Usually one takes the <tt>*.ljson</tt> format which is simply a file
  #               that contains a fully valid JSON object on every line. This makes it easy to process the results later on, because there's
  #               no need to parse the whole results JSON, which can get huge, at once.
  # [users]       How many users execute the benchmarks concurrently. This can be overridden by every benchmark and defaults to <tt>1</tt>.
  # [basic_auth]  A basic authentication that is used by ALL requests. This can be overridden per fragment in every benchmark.
  #
  #                 BigBench.config.basic_auth = ['username', 'password']
  #
  module Configuration
    
    DEFAULTS = {
      :duration         => 1.second,
      :output           => "result.ljson",
      :users            => 1,
      :mode             => :local,
      :bot_checks_every => 1.minute
    }
    
    # Resets the config object
    def self.reset!
      @@config = nil
    end
    self.reset!
    
    
    # Returns tor creates the config object
    def self.config
      @@config ||= OpenStruct.new(DEFAULTS)
    end
    
  end
  
  # Configure the benchmark by supplying a hash of options like this:
  # 
  #    BigBench.configure do |config|
  #      config.duration    = 10.seconds,
  #      config.output      = "test.ljson",
  #      config.users       = 20,
  #      config.basic_auth  = ['username', 'secret']
  #    end
  #
  # Those values can then be set and retreived with <tt>BigBench.config.duration</tt>, ...
  def self.configure
    raise "No block to configure given" unless block_given?
    yield(Configuration.config)
    Configuration.config
  end
  
  # Set and retreive the config values like this:
  #
  #    BigBench.config.duration # => 10.seconds
  #    BigBench.config.duration = 20.minutes
  #
  def self.config
    Configuration.config
  end
  
end