sessions_helper.rb

module SessionsHelper
    
  # Logs in the given user.
  def log_in(user)
      session[:user_id] = user.id
  end

  # Remembers a user in a persistent session.
  def remember(user)
    user.remember
    cookies.permanent.signed[:user_id] = user.id
    cookies.permanent[:remember_token] = user.remember_token
  end
  
  # Returns the user corresponding to the remember token cookie.
  def current_user
    if (user_id = session[:user_id])
        @current_user ||= User.find_by(id: user_id)
    elsif (user_id = cookies.signed[:user_id])
        user = User.find_by(id: user_id)
        if user && user.authenticated?(cookies[:remember_token])
            log_in user
            @current_user = user
        end
    end
  end
  
  def logged_in?
      !current_user.nil?
  end
  
  def forget(user)
    user.forget
    cookies.delete(:user_id)
    cookies.delete(:remember_token)
  end
  
  # Logs out the current user.
  def log_out
    forget(current_user)
    session.delete(:user_id)
    @current_user = nil
  end
end