Support remaining pieces in completions and scoreboards

app/models/completion.rb

@@ -5,6 +5,7 @@
 #  id                      :integer          not null, primary key
 #  display_relative_time   :string
 #  display_time_from_start :string
+#  remaining_pieces        :integer
 #  time_seconds            :integer
 #  created_at              :datetime         not null
 #  updated_at              :datetime         not null
@@ -34,10 +35,25 @@ class Completion < ApplicationRecord
   belongs_to :message, optional: true
 
   before_save :add_time_seconds
+  before_save :nullify_display_time
 
-  validates :display_time_from_start, presence: true, format: { with: /\A(((\d\d|\d):\d\d|\d\d|\d):\d\d|\d\d|\d)\z/ }
+  validates :display_time_from_start, presence: true, format: { with: /\A(((\d\d|\d):\d\d|\d\d|\d):\d\d|\d\d|\d)\z/ }, if: -> { remaining_pieces == nil }
   validates :contestant_id, uniqueness: { scope: :puzzle }, if: -> { contest.puzzles.size == 1 }
   validates :puzzle_id, uniqueness: { scope: :contestant }, if: -> { contest.puzzles.size > 1 }
+  validate :remaining_pieces_is_correct
+
+  def remaining_pieces_is_correct
+    if self.remaining_pieces && self.remaining_pieces > self.puzzle.pieces
+      errors.add(:remaining_pieces, "Cannot be greater than the number of pieces for this puzzle")
+    end
+  end
+
+  def nullify_display_time
+    if self.remaining_pieces
+      self.display_time_from_start = nil
+      self.display_relative_time = nil
+    end
+  end
 
   def add_time_seconds
     arr = display_time_from_start.split(":")