# Filters added to this controller will be run for all controllers in the application.
# Likewise, all the methods added will be available for all controllers.
class ApplicationController < ActionController::Base
  include ApplicationHelper
 
  before_filter :check_authorization
  
  # Log a user in by authorization cookie if necessary.
  def check_authorization
    authorization_token = cookies[:authorization_token]
    if authorization_token and not logged_in?
      user = User.find_by_authorization_token(authorization_token)
      user.login!(session) if user
    end
  end
  
  # Return true if a parameter corresponding to the given symbol was posted.
  def param_posted?(sym)
    request.post? and params[sym]
  end
  
  # Protect a page from unauthorized access.
  def protect
    unless logged_in?
      session[:protected_page] = request.request_uri
      flash[:notice] = "Please log in first"
      redirect_to :controller => "user", :action => "login"
      return false
    end
  end
  
  # Paginate item list if present, else call default paginate method.
  def paginate(arg, options = {})
    if arg.instance_of?(Symbol) or arg.instance_of?(String)
      # Use default paginate function.
      collection_id = arg  # arg is, e.g., :specs or "specs"
      super(collection_id, options)
    else
      # Paginate by hand.
      items = arg  # arg is a list of items, e.g., users
      items_per_page = options[:per_page] || 10
      page = (params[:page] || 1).to_i
      result_pages = Paginator.new(self, items.length, items_per_page, page)
      offset = (page - 1) * items_per_page
      [result_pages, items[offset..(offset + items_per_page - 1)]]
    end
  end
end