Longest-Word Rails livecode @lewagon

game_controller.rb

require 'open-uri'
require 'json'

class GameController < ApplicationController

  def run
    # build the grid
    @grid = generate_grid(10).join
    @start_time = Time.now
  end

  def score
    # Retrieve all game data from form
    grid = params[:grid].split("")
    @attempt = params[:attempt]
    start_time = Time.parse(params[:start_time])
    end_time = Time.now

    # Compute score
    @result = run_game(@attempt, grid, start_time, end_time)

  end

  private

  def generate_grid(grid_size)
    Array.new(grid_size) { ('A'..'Z').to_a[rand(26)] }
  end

  def included?(guess, grid)
    guess.split("").all? { |letter| grid.include? letter }
  end

  def compute_score(attempt, time_taken)
    (time_taken > 60.0) ? 0 : attempt.size * (1.0 - time_taken / 60.0)
  end

  def run_game(attempt, grid, start_time, end_time)
    result = { time: end_time - start_time }

    result[:translation] = get_translation(attempt)
    result[:score], result[:message] = score_and_message(
      attempt, result[:translation], grid, result[:time])

    result
  end

  def score_and_message(attempt, translation, grid, time)
    if translation
      if included?(attempt.upcase, grid)
        score = compute_score(attempt, time)
        [score, "well done"]
      else
        [0, "not in the grid"]
      end
    else
      [0, "not an english word"]
    end
  end


  def get_translation(word)
    response = open("http://api.wordreference.com/0.8/80143/json/enfr/#{word.downcase}")
    json = JSON.parse(response.read.to_s)
    json['term0']['PrincipalTranslations']['0']['FirstTranslation']['term'] unless json["Error"]
  end

end

Gemfile

# Very precious debug gems :)
gem 'binding_of_caller', group: :development
gem 'better_errors', group: :development

routes.rb

Rails.application.routes.draw do 
  root 'game#run'
  get "game", to: "game#run"
  get "result", to: "game#score"
end

run.html.erb

<h1>WELCOME TO THE LONGEST WORD GAME</h1>

<h2>Grid: <%= @grid %></h2>

<form action="<%= result_path %>" method="get">
  <input type="text" name="attempt">
  <input type="hidden" name="grid" value="<%= @grid %>">
  <input type="hidden" name="start_time" value="<%= @start_time %>">
  <input type="submit" value="GO">
</form>

score.html.erb

<h1>Your result</h1>

<ul>
  <li>Attempt: <%= @attempt%></li>
  <li>Translation: <%= @result[:translation]%></li>
  <li>Time: <%= @result[:time]%></li>
  <li>Message: <%= @result[:message]%></li>
  <li>Score: <%= @result[:score]%></li>
</ul>

<%= link_to("Restart", game_path) %>