games_controller.rb

class GamesController < ApplicationController
  Vertical = 'v'
  Horizontal = 'h'
  def new
    @game = Game.new
    @game.field = new_field
    @player = auth
    @game.vscore = 0 # default scores
    @game.hscore = 0
    @game.way = Vertical
    @game.range = 0
   if @game.valid? and @game.save
      redirect_to game_path(@game)
    else
      redirect_to "/404.html"
    end
  end

  def show
    @game = Game.find(params[:id])
    @length = Math.sqrt(@game.field.length).to_i
    @player = auth
    @cells = cells_availble
    case @player
    when :Vertical
      @user = "a player by vertical"
      if @game.way == Vertical
        flash[:status] = "Make you move!"
      else
        flash[:status] = "Wait move player by horizontal!"
      end
    when :Horizontal
      @user = "a player by horizontal"
      if @game.way == Horizontal
        flash[:status] = "Make you move!"
      else
        flash[:status] = "Wait move player by vertical!"
      end
    else
      @user = "a spectator"
    end
  end

  def move 
    @game = Game.find(params[:id])
    @player = auth
    @cells = cells_availble
    n = params[:n]
    if n >= 0 and  @cells.member? n
      value = @game.field[n].to_i
      case @player
      when :Vertical
        @game.vscore = @game.vscore + value
      when :Horizontal
        @game.hscore = @game.hscore + value
      else
        @game.field[n] = 0
        flash[:save_error] = "Can't save your move!" unless @game.save
      end 
    end
  end

  private

  def new_field
    return Array.new(64).map{ rand(1..8) }.join
  end

  def auth
    if session[:client].nil? or session[:client].length != 32
      session[:client] = SecureRandom.hex(16)
    end
    if @game.vplayer.nil?
      @game.vplayer = session[:client]
    elsif @game.hplayer.nil?
      if session[:client] != @game.vplayer
        @game.hplayer = session[:client]
        @game.save
      end
    end
    case session[:client]
    when @game.vplayer
      return :Vertical
    when @game.hplayer
      return :Horizontal
    else
      return :Spectator
    end
  end

  def cells_availble
    if @player == :Vertical and @game.way == Vertical
     (@game.range..@game.field.length).step @length
    elsif @player == :Horizontal and @game.way == Horizontal
      i = @length*@game.range
      i..(i+@length)
    else
      -1..-1
    end
  end
end