feature: item

- add draw method to Item class with fallback colors
- fix ItemManager class name typo and missing self parameter in _random_position
- add draw and clear methods to ItemManager
- rename ITEM_SPAWN_INTERVAL to ITEM_SHOPPING_TIMER in is_expired

src/item.py

@@ -29,16 +29,34 @@ class Item:
 
     # to check if the time ran out to buy the item
     def is_expired(self):
-        return pygame.time.get_ticks() - self.spawn_time >= ITEM_SPAWN_INTERVAL
+        return pygame.time.get_ticks() - self.spawn_time >= ITEM_SHOPPING_TIMER
 
+    # cam offset to convert world coordinates to screen coordinates
+    def draw(self, screen, cam_x, cam_y):
+        draw_x = self.x - cam_x
+        draw_y = self.y - cam_y
 
-class ItemManger:
+        if self.image is not None:
+            screen.blit(self.image, (draw_x, draw_y))
+        else:
+            # fallback using settings colors
+            # coffee brown, beer yellow
+            if self.item_type == "coffee":
+                color = (120, 70, 30)
+            else:
+                color = COLOR_HP_BAR_YELLOW
+
+            draw_rect = (draw_x, draw_y, ITEM_SIZE, ITEM_SIZE)
+            pygame.draw.rect(screen, color, draw_rect)
+            pygame.draw.rect(screen, COLOR_HP_BAR_BG, draw_rect, 2)
+
+class ItemManager:
     def __init__(self):
         self.items = []
         self.last_spawn_time = pygame.time.get_ticks()
 
     # try 50 times to find a free position to spawn item
-    def _random_position(room_rect, blocked_rects):
+    def _random_position(self, room_rect, blocked_rects):
         attempts = 0
         max_attempts = 50
 
@@ -66,7 +84,7 @@ class ItemManger:
         return None
 
 
-    # remove expired items
+    # remove expired items and spawn new ones
     def update(self, room_rect, blocked_rects):
         now = pygame.time.get_ticks()
 
@@ -78,3 +96,15 @@ class ItemManger:
 
         # replace the old list with the new temp_list
         self.items = remaining_items
+
+        # todo spawn logic for ned ones with random time? (in settings we can set the time range?)
+
+    # draw active items
+    def draw(self, screen, cam_x, cam_y):
+        for item in self.items:
+            item.draw(screen, cam_x, cam_y)
+
+    # clear items when changing room
+    def clear(self):
+        self.items = []
+        self.last_spawn_time = pygame.time.get_ticks()