Add score calculation

src/expansion.cr

@@ -108,7 +108,7 @@ end
 def render_world(world)
   printf "Now:\n  %s\n\n", render_time(world.ts)
   if world.win?
-    printf "YOU WIN!!!\n\n"
+    printf "YOU WIN!!! Score: %d\n\n", world.score
   end
   render_commands world
   printf "\n"

src/game/world.cr

@@ -2,6 +2,7 @@ require "./resources"
 
 class Game::World
   property ts : Int64
+  property win_ts : Int64?
 
   def initialize(@ts = 0_i64)
     @map = Map.new
@@ -13,6 +14,7 @@ class Game::World
   getter resources
   getter map
   getter queue
+  getter win_ts
 
   def push(command : Command)
     dur = command.start(self)
@@ -29,6 +31,9 @@ class Game::World
       command = item.command
       @ts = item.ts
       command.finish(self)
+      if win?
+        @win_ts = @ts
+      end
     end
     @ts = ts
   end
@@ -36,4 +41,13 @@ class Game::World
   def win?
     @resources[ResourceType::Terraformation] >= 100
   end
+
+  def score
+    case @win_ts
+    when Int64
+      Math.max(0, 3600_i64 - @win_ts.as(Int64))
+    else
+      0
+    end
+  end
 end