class ApplicationController < ActionController::Base
  before_filter :get_uri, :except => [:login, :new]
  helper_method :current_user

  private

  def get_session
    redirect_to(:controller => 'user', :action => 'login') unless session[:user]
  end

  def get_uri
    session[:uri] = request.request_uri unless session[:user]
  end

  def current_user
    return unless session[:user]
    @current_user ||= User.find(session[:user])
  end
end

class UserController < ApplicationController
  before_filter :get_session, :only => [:edit]

  def login
    @page_title = 'Hello'
    redirect_to(:controller => 'user', :action => 'show', :id => current_user) if current_user
    return unless request.post? && user = User.find_by_name(params[:user][:name])
    session[:user] ||= user.id
    if user.password == params[:user][:password]
      uri = session[:uri]
      session[:uri] = nil
      redirect_to(uri || {:controller => 'user', :action => 'show', :id => current_user})
    end
  end
end