class VersionsController < ApplicationController
  cache_sweeper :page_sweeper, :only => [ :create ]

  before_filter :find_book

  def show
    @page    = @book.pages.find_by_title(params[:page_title])
    @version = @page.entry_versions[params[:version_number].to_i - 1]
  end

  def new
    Book.transaction do
      @page    = @book.find_or_build_page(params[:page_title])
      @version = @page.find_or_build_version(params[:version_number])
    end
    
    @author_name = cookies[:author_name] || "Anonymous Coward"
  end

  def create
    begin
      Book.transaction do
        @page = @book.find_or_create_page(params[:page])
        author = @book.find_or_create_author(params[:author_name], request.remote_ip)
        base_revision_number = params[:page][:revision_number].to_i
        @page.create_version(author, base_revision_number, params[:version])
      end
      cookies[:author_name] = { :value => params[:author_name], :expires => 20.years.from_now }
      redirect_to page_url(:page_title => @page)
    rescue => e
      flash[:error] = e.message
      redirect_to new_url(:book_url_name => @book, :page_title => @page)
    end
  end
end