Add blue star award, refactor the code

.ruby-version

@@ -1 +1 @@
-2.7.2
+3.1.2

Gemfile.lock

@@ -1,23 +1,28 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.2.5)
+    diff-lcs (1.5.0)
     rake (13.0.6)
-    rspec (2.14.1)
-      rspec-core (~> 2.14.0)
-      rspec-expectations (~> 2.14.0)
-      rspec-mocks (~> 2.14.0)
-    rspec-core (2.14.8)
-    rspec-expectations (2.14.5)
-      diff-lcs (>= 1.1.3, < 2.0)
-    rspec-mocks (2.14.6)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.0)
 
 PLATFORMS
-  ruby
+  x86_64-linux
 
 DEPENDENCIES
   rake
   rspec
 
 BUNDLED WITH
-   2.3.16
+  2.3.23

models.rb

@@ -0,0 +1,85 @@
+module Award
+  attr_reader :expires_in, :quality
+
+  def initialize(expires_in, quality)
+    validate_input(expires_in, quality)
+    @expires_in = expires_in
+    @quality = quality
+  end
+
+  def is_distinction_plus?
+    self.class.name == "BlueDistinctionPlusAward"
+  end
+
+  def update_quality
+    unless is_distinction_plus?
+      update_expiry
+      super
+      normalize_quality
+    end
+  end
+
+  def update_expiry
+    @expires_in -= 1
+  end
+
+  def expired?
+    @expires_in <= 0
+  end
+
+  def validate_input(expires_in, quality)
+    raise "Invalid expiry" unless expires_in.is_a?(Integer)
+    raise "Invalid quality" unless quality.is_a?(Integer) && (
+      is_distinction_plus? ? quality == 80 : (0..50).include?(quality)
+    )
+  end
+
+  def normalize_quality
+    @quality = 50 if @quality > 50
+    @quality = 0 if @quality < 0
+  end
+end
+
+class BaseAward
+  prepend Award
+
+  def update_quality
+    @quality -= (expired? ? 2: 1)
+  end
+end
+
+class BlueFirstAward
+  prepend Award
+
+  def update_quality
+    @quality += (expired? ? 2 : 1)
+  end
+end
+
+class BlueDistinctionPlusAward
+  prepend Award
+end
+
+class BlueCompareAward
+  prepend Award
+
+  def update_quality
+    if @expires_in < 0
+      @quality = 0
+    elsif @expires_in <= 4
+      @quality += 3
+    elsif @expires_in <= 9
+      @quality += 2
+    else
+      @quality += 1
+    end
+  end
+end
+
+class BlueStarAward
+  prepend Award
+
+  def update_quality
+    @quality -= (expired? ? 4: 2)
+  end
+end