rps_sinatra.rb

require 'sinatra'

get '/play/:choice' do
  player_choice = params[:choice]

  choices = ["rock", "paper", "scissors"]

  if player_choice == "random"
    player_choice = choices.sample
  end

  if not choices.include? player_choice
    next "Your choice, '#{player_choice}', is invalid"
  end

  computer_choice = choices.sample

  game_rules = {
    "rock"     => "scissors",
    "scissors" => "paper",
    "paper"    => "rock",
  }

  if player_choice == computer_choice
    "Your choice was #{player_choice}, Computer choice is #{computer_choice}. It's a tie"
  elsif player_choice == game_rules[computer_choice]
    "Your choice was #{player_choice}, Computer choice is #{computer_choice}. You lose"
  else
    "Your choice was #{player_choice}, Computer choice is #{computer_choice}. You win"
  end
end