require 'active_support/core_ext'

module EventBus

  def self.set_up_logging
    base_logdir = ENV['EVENTBUS_LOGDIR']
    
    if base_logdir.nil? 
      base_logdir = File.join(ENV['HOME'], "logs", self.PROD_LEVEL, "eventbus", self.application_id)  
    end
    
    FileUtils.mkdir_p(base_logdir) unless File.directory?(base_logdir)
        
    filename = [File.basename($PROGRAM_NAME, File.extname($PROGRAM_NAME)), ".log"].join
    logfile_path = File.join(base_logdir, filename)
    
    shift_age = ENV['EVENTBUS_LOG_SHIFT_AGE'] || "daily"
    shift_size = ENV['EVENTBUS_LOG_SHIFT_SIZE'] || 20971520 # 20MB
    
    puts "Logging to #{logfile_path}."
    self.logger = Logger.new(logfile_path, shift_age, shift_size)
    logger.info "Logging initialized. Rotation age: #{shift_age} Rotation size: #{shift_size}" 
  
  end


  # CONSTANTS

  # True Constants
  mattr_accessor :CORE_APPLICATION_ID
  mattr_accessor :DEFAULT_APPLICATION_ID
  mattr_accessor :DEFAULT_PROD_LEVEL
  
  self.CORE_APPLICATION_ID = "EVENTBUS_CORE"            
  self.DEFAULT_APPLICATION_ID = self.CORE_APPLICATION_ID
  self.DEFAULT_PROD_LEVEL = "development"

  # Calculated Constants
  mattr_accessor :PROD_LEVEL
  self.PROD_LEVEL = ENV['EVENTBUS_PROD_LEVEL'] || self.DEFAULT_PROD_LEVEL
  
  # VARIABLES 
  
  mattr_accessor :application_id
  self.application_id = ENV['EVENTBUS_APPLICATION_ID'] || self.DEFAULT_APPLICATION_ID
  
  mattr_accessor :logger
  self.set_up_logging

end