class Session
  attr_reader :bot, :owner, :users

  def initialize(event, owner)
    @bot = event.bot
    @owner = owner
    @users = [owner]
    event.respond "New Ika session created!"
  end

  COMMANDS = %w[
                join
               ]

  def command_join(event)
    user = event.message.author
    if contains_user? user
      "#{event.message.author.username} is already in this session"
    else
      "#{event.message.author.username} joined"
    end
  end

  def add_user(user)
    users << user 
  end

  def contains_user?(user)
    users.include? user
  end

  def valid_command(message_content)
    prebang, cmd = message_content.split("!")
    cmd if prebang.empty? && COMMANDS.include?(cmd)
  end

  def respond_to(event)
    if command = valid_command(event.message.content)
      puts "running !#{command} from #{event.message.author.username}"
      event.respond send("command_#{command}", event)
    else
      respond_to_normal_message event
    end
  end

  def respond_to_normal_message(event)
    puts "received '#{event.message.content}' from #{event.message.author.username}"
  end
end