require "active_support/core_ext/time/conversions"

class Mrsk::Commands::Auditor < Mrsk::Commands::Base
  attr_reader :role

  def initialize(config, role: nil)
    super(config)
    @role = role
  end

  # Runs remotely
  def record(line)
    append \
      [ :echo, tagged_record_line(line) ],
      audit_log_file
  end

  # Runs locally
  def broadcast(line)
    if broadcast_cmd = config.audit_broadcast_cmd
      [ broadcast_cmd, tagged_broadcast_line(line) ]
    end
  end

  def broadcast_environment(line)
    {
      "MRSK_PERFORMER" => performer,
      "MRSK_ROLE" => role,
      "MRSK_DESTINATION" => config.destination,
      "MRSK_MESSAGE" => line
    }
  end

  def reveal
    [ :tail, "-n", 50, audit_log_file ]
  end

  private
    def audit_log_file
      [ "mrsk", config.service, config.destination, "audit.log" ].compact.join("-")
    end

    def tagged_record_line(line)
      tagged_line recorded_at_tag, performer_tag, role_tag, line
    end

    def tagged_broadcast_line(line)
      tagged_line performer_tag, role_tag, destination_tag, line
    end

    def tagged_line(*tags_and_line)
      "'#{tags_and_line.compact.join(" ")}'"
    end

    def recorded_at_tag
      "[#{Time.now.to_fs(:db)}]"
    end

    def performer
      `whoami`.strip
    end

    def performer_tag
      "[#{performer}]"
    end

    def role_tag
      "[#{role}]" if role
    end

    def destination_tag
      "[#{config.destination}]" if config.destination
    end
end