Implement logging system: add GameLogger class for managing log messages, integrate logging in HUDLayer and ShrodingersMine for enhanced gameplay feedback.

game/hud/layer.rb

@@ -1,5 +1,6 @@
 require_relative "inventory"
 require_relative "health"
+require_relative "logs"
 
 class HUDLayer
   def initialize
@@ -7,17 +8,23 @@ class HUDLayer
     @hud_fg = Gosu::Image.new("assets/images/hud_fg.png", retro: true)
     @inventory = Inventory.new
     @health = HealthBar.new(100)
+    @logs = GameLogger.new
 
     $bus.on(:enemy_attack) do |damage|
       @health.take_damage(damage)
     end
   end
 
+  def update(dt)
+    @logs.update(dt)
+  end
+
   def draw
     @hud_bg.draw(0, 0, Float::INFINITY)
 
     @inventory.draw
     @health.draw
+    @logs.draw
 
     @hud_fg.draw(0, 0, Float::INFINITY)
   end

game/hud/logs.rb

@@ -0,0 +1,47 @@
+class GameLogger
+  MAX_ENTRIES = 5          # max messages to show
+  DURATION = 3.0           # seconds each message stays
+
+  Entry = Struct.new(:text, :time)
+
+  def initialize
+    @entries = []
+    @font = Gosu::Font.new(10, name: 'assets/fonts/tn.ttf')
+
+    $bus.on(:log) do |msg|
+      log(msg)
+    end
+  end
+
+  # add a message
+  def log(msg)
+    @entries << Entry.new(msg, DURATION)
+    @entries.shift if @entries.size > MAX_ENTRIES
+  end
+
+  def update(dt)
+    @entries.each { |e| e.time -= dt }
+    @entries.reject! { |e| e.time <= 0 }
+  end
+
+  def draw
+    padding_x = 10
+    padding_y = 10
+    line_height = 24
+
+    # bottom-left start
+    base_x = padding_x
+    base_y = SCREEN_SIZE[1] - padding_y - line_height * @entries.size
+
+    @entries.each_with_index do |e, i|
+      @font.draw_text(
+        e.text,
+        base_x,
+        base_y + i * line_height,
+        Float::INFINITY,
+        1, 1,
+        Gosu::Color::YELLOW
+      )
+    end
+  end
+end