box-o-sand/rails/map-mash/app/controllers/mash_tournaments_controller.rb

class MashTournamentsController < ApplicationController
  def index
    @mash_tournaments = MashTournament.all

    respond_to do |format|
      format.html
    end
  end

  def show
    begin
      @mash_tournament = MashTournament.find(params[:id])
    rescue ActiveRecord::RecordNotFound
      redirect_to :action => 'new' and return
    end

    if not @mash_tournament.done?
      redirect_to new_mash_path
      flash[:notice] = "You're not quite done there."
      return
    end

    logger.info("Mash tournament #{@mash_tournament.id} is done!")
    respond_to do |format|
      format.html
    end
  end

  def new
    requester = Requester.find_or_initialize_by_ip(request.remote_ip)
    if requester.current_tournament && !requester.current_tournament.done?
      flash[:notice] = "But you haven't finished this one yet :-("
      redirect_to new_mash_path and return
    end

    @mash_tournament = MashTournament.new(:requester => requester)
    requester.save

    respond_to do |format|
      format.html
    end
  end

  def create
    if not (requester = Requester.find_by_ip(request.remote_ip))
      flash[:notice] = "Not so fast..."
      redirect_to new_mash_tournament_path and return
    end
    if requester.current_tournament && !requester.current_tournament.done?
      flash[:notice] = "Seriously, you haven't finished this one yet! :-P"
      redirect_to new_mash_path and return
    end

    @mash_tournament = MashTournament.new(:requester => requester)
    rounds = params.fetch(:mash_tournament, {}).fetch(:total_rounds, 3).to_i

    respond_to do |format|
      action_new = lambda { format.html { render :action => 'new' } }

      if @mash_tournament.save
        builder = @mash_tournament.builder
        if builder.create_rounds_for_contenders(2 ** rounds) == rounds and
              builder.fill_in_next_round.length == (2 ** rounds) / 2
          flash[:notice] = "Let's start mashing!"
          format.html do
            redirect_to :controller => 'mashes', :action => 'new'
          end
        else
          action_new.call
        end
      else
        action_new.call
      end
    end
  end
end