7.rb

# story: as a user I can see how many attempts it took to match all the cards

# acceptance criteria:
# - I get an accurate count of attempts as "how many times I tried to match a pair"
# - I can see the number of attempts reported at the end of the game




# setup the cards
cards = [['a','*'],['b','*'],['a','*'],['b','*']] # setup the data structure

# setup the view
puts "welcome to Remory, a game of memory"        # print game header
view = cards.map(&:last)                          # setup game variables
showing = []
attempts = 0

loop do
  # show the board
  puts
  puts "-" * 20                                   # print round header
  puts "here is the board"
  puts view.join(" | ")                           # print the board
  puts "pick a number 1 - #{cards.length}"        # prompt the user for input

  # collect the input
  input = gets.chomp                              # collect and clean user input
  pos = input.to_i - 1                            # convert input to a number

  # bug fixes
  next if input.empty?                            # enforce a meaningful input
  next unless (0...cards.length).include? pos     # enforce a meaningful position
  next if view[pos] != '*'                        # enforce a valid choice

  # apply the input
  face = cards[pos].first                         # extract card value
  view[pos] = face                                # save card value to view

  # show the result
  puts "you flipped card #{input}"
  puts view.join(" | ")                           # print the board

  # track the cards facing up
  showing.push(face)                              # track which cards are showing

  # check if we have a pair
  if showing.count == 2                           # if 2 cards are showing
    print "you picked 2 cards: #{showing} ... "

    if showing.first == showing.last              # if they're the same card
      puts "and they match!"
      view.map! { |c| c == '*' ? c : '_' }        # clear matching cards
    else
      puts "but they're different."
      view.map! { |c| c == '_' ? c : '*' }        # reset all but the nil cards
    end

    showing.clear                                 # clear showing cards
    attempts += 1                                 # keep track of a new attempt
  end

  # end the loop when the view is empty
  break if view.all?{|c| c == '_'}                # end the game if no cards left
end

puts "game over!"                                 # print game over
puts "you won in #{attempts} attempts"            # print game report