game.rb

require 'sinatra'

# before we process a route, we'll set the response as
# plain text and set up an array of viable moves that
# a player (and the computer) can perform
before do 
	content_type :txt 
	@defeat = {rock: :scissors, paper: :rock, scissors: :paper}
	@throws = @defeat.keys
end

get '/throw/:type' do
	# the params[] has stores querystring and form data
	player_throw = params[:type].to_sym

	# in the case of a player providing a throw that is not valid,
	# we halt with a status code of 403 (forbidden) and let them
	# know they need to make a valid throw to play
	if !@throws.include?(player_throw)
		halt 403, "You must throw one of the following: #{@throws}"
	end

	#now we can select a random throw for the computer
	computer_throw = @throws.sample
	computer_message = "The computer threw #{computer_throw}."
	

	# compare the player and computer throws to determine a winner
	if player_throw == computer_throw
		"#{computer_message} You tied with the computer. Try again!"
	elsif computer_throw == @defeat[player_throw]
		"#{computer_message} Nicely done; #{player_throw} beats #{computer_throw}!"
	else 
		"#{computer_message} Ouch; #{computer_throw} beats #{player_throw}. Better luck next time."
	end	
			
end