Merge branch 'feat/monsters' into 'main'

feat: implement game loop

See merge request swd25-bootcamp/silent-fh!28

src/endscreen.py

@@ -1,6 +1,6 @@
 import pygame
-from button import Button
-from settings import (COLOR_ENDSCREEN_BACKGROUND,
+from src.button import Button
+from src.settings import (COLOR_ENDSCREEN_BACKGROUND,
                       COLOR_ENDSCREEN_TEXT,
                       COLOR_ENDSCREEN_WIN,
                       COLOR_ENDSCREEN_LOSE,

src/game.py

@@ -1,8 +1,8 @@
 """Small playable demo that uses ``src.map.Map`` and the actor system.
 
 Controls:
-- WASD / arrow keys: move Knoll around the map
-- Space: switch between good/normal and bad/angry sprite
+- WASD / arrow keys: move Niklas around the map
+- Space: toggle player state
 - Esc / Q: quit
 """
 
@@ -14,10 +14,27 @@ from typing import Optional
 import pygame
 
 from src.actors import Actor
+from src.door import Door
+from src.ects import ECTS
+from src.endscreen import Endscreen
+from src.hud import HUD
+from src.item import Item, ItemManager
 from src.map import Map, color_void, screen_h, screen_w, tile_size
-from src.settings import DEMO_ACTOR_HEIGHT, FPS, PLAYER_SPEED
+from src.monster import MonsterManager
+from src.settings import (
+    BEER_BOTTLE_ECTS_VALUE,
+    COFFEE_HEAL_VALUE,
+    DEMO_ACTOR_HEIGHT,
+    DOOR_HEIGHT,
+    DOOR_HP,
+    DOOR_WIDTH,
+    FPS,
+    PLAYER_SPEED,
+)
+from src.shop import Shop
 from src.startscreen import Startscreen
 from src.sounds import SoundManager
+from src.tower import Tower
 
 
 def tile_center(column: int, row: int) -> tuple[int, int]:
@@ -31,26 +48,45 @@ class Game:
         self.screen = pygame.display.set_mode((screen_w, screen_h))
         self.clock = pygame.time.Clock()
         self.font = pygame.font.SysFont("monospace", 22, bold=True)
+        self.item_font = pygame.font.SysFont("Arial", 16, bold=True)
         self.running = True
 
         self.active_monster = None
+        self.buy_requested = False
 
         # --- SOUND & SYSTEMS ---
         self.sound_manager = SoundManager()
         self.startscreen = Startscreen(self.screen)
-
+        self.hud = HUD()
+        self.ects = ECTS()
+        self.item_manager = ItemManager()
+        self.shop = Shop(self.ects, self.item_manager.items, self.sound_manager)
+        self.tower = Tower(self.sound_manager)
         self.state = "startscreen"
         self.player_name: str = ""
+        self.game_start_time = 0
+        self.endscreen: Optional[Endscreen] = None
+        self.current_item_room_key: Optional[tuple[int, int, int, int]] = None
 
         self.map = Map()
+        self.active_door: Optional[Door] = None
+        self.doors_by_room: dict[tuple[int, int, int, int], Door] = {}
 
         assets_dir = Path(__file__).resolve().parent.parent / "assets"
-        actor_sides = Actor.load_sprite_sides(assets_dir, target_height=DEMO_ACTOR_HEIGHT)
+        player_asset = Actor.load_sprite_asset(
+            assets_dir / "niklas_sprites",
+            target_height=DEMO_ACTOR_HEIGHT,
+        )
+        self.player = Actor(
+            name="Niklas",
+            good_asset=player_asset,
+            bad_asset=player_asset,
+            position=self.find_start_position(),
+        )
 
-        if not actor_sides:
-            raise RuntimeError(f"Keine Sprites in {assets_dir} gefunden!")
-
-        self.player = Actor.from_sides(actor_sides[0], self.find_start_position())
+        monster_sides = Actor.load_sprite_sides(assets_dir, target_height=DEMO_ACTOR_HEIGHT)
+        self.monsters = MonsterManager(monster_sides, self.map)
+        self.monsters.spawn_initial(self.get_monster_spawn_blockers())
 
     def run(self, max_frames: Optional[int] = None) -> None:
         frame_count = 0
@@ -63,6 +99,7 @@ class Game:
                     self.running = False
                 elif next_state == "game":
                     self.player_name = self.startscreen.player_name
+                    self.game_start_time = pygame.time.get_ticks()
                     self.state = "game"
                     self.sound_manager.play_bgm("normal")
 
@@ -70,6 +107,14 @@ class Game:
                 self.handle_events()
                 self.update(dt)
                 self.draw()
+            elif self.state == "endscreen":
+                next_state = self.endscreen.run() if self.endscreen is not None else "startscreen"
+                if next_state == "quit":
+                    self.running = False
+                elif next_state == "startscreen":
+                    self.state = "startscreen"
+                elif next_state == "game":
+                    self.restart_game()
 
             pygame.display.flip()
             frame_count += 1
@@ -86,6 +131,8 @@ class Game:
                 elif event.key == pygame.K_SPACE:
                     self.player.toggle_side()
                     self.sound_manager.play_sfx("monster_transform")
+                elif event.key == pygame.K_e:
+                    self.buy_requested = True
 
     def update(self, dt: float) -> None:
         if self.player.is_bad:
@@ -102,6 +149,17 @@ class Game:
             self.player.hit_wall()
 
         self.player.update_animation(dt)
+        self.ects.update(self.is_player_at_desk())
+        self.handle_room_table_collision()
+        self.update_items()
+        self.monsters.update(
+            dt,
+            self.player.position,
+            self.is_position_walkable,
+            self.get_monster_spawn_blockers(),
+        )
+        self.update_tower()
+        self.check_end_conditions()
 
     def get_player_movement(self, dt: float) -> pygame.Vector2:
         keys = pygame.key.get_pressed()
@@ -127,6 +185,195 @@ class Game:
         row = int(position.y // tile_size)
         return self.map.is_accessible(column, row)
 
+    def is_player_at_desk(self) -> bool:
+        """Return True while the player's hitbox touches a desk in the current room."""
+
+        player_rect = self.get_actor_rect(self.player)
+        room_rect = self.map.get_current_room(player_rect)
+        if room_rect is None:
+            return False
+
+        return any(desk.check_collision(player_rect) for desk in self.map.get_desks_for_room(room_rect))
+
+    def update_tower(self) -> None:
+        """Spawn a tower when enough ECTS are available and let it attack the zombie."""
+
+        player_rect = self.get_actor_rect(self.player)
+        room_rect = self.map.get_current_room(player_rect)
+        monster = self.monsters.monsters[0] if self.monsters.monsters else None
+        if monster is None or not monster.is_alive:
+            self.tower.clear()
+            return
+
+        damage = self.tower.update(
+            room_rect,
+            self.get_tower_spawn_blockers(),
+            self.ects,
+            monster.rect,
+        )
+        if monster is not None and damage > 0:
+            monster.take_damage(damage)
+            if not monster.is_alive:
+                self.tower.clear()
+
+    def update_items(self) -> None:
+        """Spawn room items and process one player purchase request."""
+
+        player_rect = self.get_actor_rect(self.player)
+        room_rect = self.map.get_current_room(player_rect)
+        room_key = self.get_room_key(room_rect) if room_rect is not None else None
+
+        if room_key != self.current_item_room_key:
+            self.item_manager.clear()
+            self.current_item_room_key = room_key
+
+        self.item_manager.update(room_rect, self.get_item_spawn_blockers())
+
+        if self.buy_requested:
+            self.try_buy_touching_item(player_rect)
+            self.buy_requested = False
+
+    def try_buy_touching_item(self, player_rect: pygame.Rect) -> None:
+        item = self.item_manager.get_touching_item(player_rect)
+        if item is None:
+            return
+
+        if self.shop.buy_item(item):
+            self.apply_item_effect(item)
+            self.item_manager.remove_item(item)
+
+    def apply_item_effect(self, item: Item) -> None:
+        if item.item_type == "beer":
+            self.ects.upgrade_rate(BEER_BOTTLE_ECTS_VALUE)
+        elif item.item_type == "coffee" and self.active_door is not None:
+            self.active_door.current_hp = min(
+                self.active_door.max_hp,
+                self.active_door.current_hp + COFFEE_HEAL_VALUE,
+            )
+
+    def check_end_conditions(self) -> None:
+        if self.active_door is not None and self.active_door.current_hp <= 0:
+            self.show_endscreen(won=False)
+
+    def show_endscreen(self, won: bool) -> None:
+        self.endscreen = Endscreen(
+            self.screen,
+            self.player_name,
+            self.ects.ects_balance,
+            self.get_elapsed_seconds(),
+            won,
+        )
+        self.state = "endscreen"
+
+    def restart_game(self) -> None:
+        self.ects = ECTS()
+        self.shop = Shop(self.ects, self.item_manager.items, self.sound_manager)
+        self.item_manager.clear()
+        self.current_item_room_key = None
+        self.tower.clear()
+        self.active_door = None
+        self.doors_by_room = {}
+        self.player.set_position(self.find_start_position())
+        self.monsters.clear()
+        self.monsters.spawn_initial(self.get_monster_spawn_blockers())
+        self.game_start_time = pygame.time.get_ticks()
+        self.endscreen = None
+        self.state = "game"
+
+    def handle_room_table_collision(self) -> None:
+        """Close/draw the room door and wake monsters when player hits a desk."""
+
+        player_rect = self.get_actor_rect(self.player)
+        room_rect = self.map.get_current_room(player_rect)
+        if room_rect is None:
+            return
+
+        for desk in self.map.get_desks_for_room(room_rect):
+            if desk.check_collision(player_rect):
+                door = self.get_or_create_door_for_room(room_rect)
+                if door.current_hp > 0:
+                    door.is_closed = True
+                    self.active_door = door
+                    self.monsters.activate_for_room(room_rect, door)
+                return
+
+    def get_or_create_door_for_room(self, room_rect: pygame.Rect) -> Door:
+        key = self.get_room_key(room_rect)
+        if key not in self.doors_by_room:
+            self.doors_by_room[key] = self.create_door_for_room(room_rect)
+        return self.doors_by_room[key]
+
+    def create_door_for_room(self, room_rect: pygame.Rect) -> Door:
+        """Create a Door object centered on the map's D tiles for this room."""
+
+        door_tiles: list[pygame.Rect] = []
+        for row_index, row in enumerate(self.map.map):
+            for column_index, tile in enumerate(row):
+                if tile != "D":
+                    continue
+
+                tile_rect = pygame.Rect(
+                    column_index * tile_size,
+                    row_index * tile_size,
+                    tile_size,
+                    tile_size,
+                )
+                if (
+                    room_rect.left <= tile_rect.centerx <= room_rect.right
+                    and room_rect.bottom <= tile_rect.centery <= room_rect.bottom + 2 * tile_size
+                ):
+                    door_tiles.append(tile_rect)
+
+        if not door_tiles:
+            return Door(room_rect.centerx - DOOR_WIDTH // 2, room_rect.bottom, DOOR_HP)
+
+        door_area = door_tiles[0].copy()
+        for tile_rect in door_tiles[1:]:
+            door_area.union_ip(tile_rect)
+
+        return Door(
+            door_area.centerx - DOOR_WIDTH // 2,
+            door_area.centery - DOOR_HEIGHT // 2,
+            DOOR_HP,
+        )
+
+    def get_monster_spawn_blockers(self) -> list[pygame.Rect]:
+        """Rects that monsters should not spawn on."""
+
+        blockers = [self.get_actor_rect(self.player)]
+        for desk_list in self.map.desks.values():
+            blockers.extend(desk.rect for desk in desk_list)
+        return blockers
+
+    def get_tower_spawn_blockers(self) -> list[pygame.Rect]:
+        """Rects that towers should not spawn on."""
+
+        blockers = self.get_monster_spawn_blockers()
+        if self.active_door is not None:
+            blockers.append(pygame.Rect(self.active_door.x, self.active_door.y, DOOR_WIDTH, DOOR_HEIGHT))
+        for monster in self.monsters.monsters:
+            blockers.append(monster.rect)
+        blockers.extend(item.rect for item in self.item_manager.items)
+        return blockers
+
+    def get_item_spawn_blockers(self) -> list[pygame.Rect]:
+        """Rects that room items should not spawn on."""
+
+        blockers = self.get_tower_spawn_blockers()
+        if self.tower.tower_rect is not None:
+            blockers.append(self.tower.tower_rect)
+        blockers.extend(item.rect for item in self.item_manager.items)
+        return blockers
+
+    @staticmethod
+    def get_room_key(room_rect: pygame.Rect) -> tuple[int, int, int, int]:
+        return room_rect.x, room_rect.y, room_rect.width, room_rect.height
+
+    @staticmethod
+    def get_actor_rect(actor: Actor) -> pygame.Rect:
+        frame = actor.get_frame()
+        return frame.get_rect(midbottom=(round(actor.position.x), round(actor.position.y)))
+
     def find_start_position(self) -> tuple[int, int]:
         for row_index, row in enumerate(self.map.map):
             column_index = row.find("S")
@@ -137,9 +384,31 @@ class Game:
                 )
         return tile_size, tile_size
 
+    def get_elapsed_seconds(self) -> int:
+        if self.game_start_time == 0:
+            return 0
+        return (pygame.time.get_ticks() - self.game_start_time) // 1000
+
     def draw(self) -> None:
         self.screen.fill(color_void)
         self.map.draw_map(self.screen, self.font)
 
-        for actor in sorted([self.player], key=lambda item: item.position.y):
+        if self.active_door is not None and self.active_door.is_closed:
+            self.active_door.draw(self.screen)
+
+        self.item_manager.draw(self.screen, 0, 0, self.item_font)
+        self.tower.draw(self.screen, self.font)
+
+        # Draw by Y position so actors lower on the map appear in front.
+        actors = [self.player, *self.monsters.actors]
+        for actor in sorted(actors, key=lambda item: item.position.y):
             actor.draw(self.screen)
+
+        self.hud.draw(
+            self.screen,
+            self.player_name,
+            self.active_door,
+            self.monsters.monsters[0] if self.monsters.monsters else None,
+            self.ects,
+            self.get_elapsed_seconds(),
+        )

src/hud.py

@@ -3,20 +3,20 @@ from src.settings import (
     HUD_FONT, HUD_FONT_SIZE, HUD_FONT_BOLD,
     COLOR_HUD_TEXT, COLOR_HP_BAR_GREEN, COLOR_HP_BAR_RED, COLOR_HP_BAR_BG,
     HUD_BAR_WIDTH, HUD_BAR_HEIGHT,
-    HUD_X_OFFSET, HUD_BAR_X, HUD_Y_DOOR, HUD_Y_ZOMBIE, HUD_Y_ECTS
 )
 
-# draw status bar (background bar and the colored hp bar)
+
 def _draw_status_bar(screen, x, y, current, max_val, color):
     # bg bar is always the same
     pygame.draw.rect(screen, COLOR_HP_BAR_BG, (x, y, HUD_BAR_WIDTH, HUD_BAR_HEIGHT))
 
     # hp bar
     if max_val > 0:
-        hp_width = (current / max_val) * HUD_BAR_WIDTH
-        pygame.draw.rect((screen, color), (x, y, hp_width, HUD_BAR_HEIGHT))
+        current = max(0, min(current, max_val))
+        hp_width = int((current / max_val) * HUD_BAR_WIDTH)
+        pygame.draw.rect(screen, color, (x, y, hp_width, HUD_BAR_HEIGHT))
+
 
-# time formatter for MM:SS
 def _format_time(total_seconds):
     mins = total_seconds // 60
     secs = total_seconds % 60
@@ -26,22 +26,52 @@ def _format_time(total_seconds):
 class HUD:
     def __init__(self):
         self.font = pygame.font.SysFont(HUD_FONT, HUD_FONT_SIZE, bold=HUD_FONT_BOLD)
+        self.small_font = pygame.font.SysFont(HUD_FONT, max(16, HUD_FONT_SIZE - 4), bold=False)
+
+    def draw(self, screen, player_name, door, zombie, ects, total_time):
+        """Draw the game HUD at the bottom of the screen."""
+
+        panel_height = 86
+        panel_rect = pygame.Rect(0, screen.get_height() - panel_height, screen.get_width(), panel_height)
+        pygame.draw.rect(screen, (10, 10, 15), panel_rect)
+        pygame.draw.rect(screen, (70, 70, 80), panel_rect, 2)
+
+        top = panel_rect.top + 12
+        label_y = top
+        bar_y = top + 34
+
+        # --- PLAYER ---
+        player_text = f"PLAYER: {player_name or 'Student'}"
+        screen.blit(self.font.render(player_text, True, COLOR_HUD_TEXT), (20, label_y))
 
-    def draw(self, screen, door, zombie, ects, total_time):
         # --- DOOR HP ---
-        _draw_status_bar(screen, HUD_BAR_X, HUD_Y_DOOR, door.current_hp, COLOR_HP_BAR_GREEN)
-        # -5 px, small off-set to align the text better with hp bar
-        screen.blit(self.font.render("DOOR HP ", True, COLOR_HUD_TEXT), (HUD_X_OFFSET, HUD_Y_DOOR - 5))
+        door_x = 330
+        screen.blit(self.font.render("DOOR HP", True, COLOR_HUD_TEXT), (door_x, label_y))
+        if door is not None:
+            _draw_status_bar(screen, door_x, bar_y, door.current_hp, door.max_hp, COLOR_HP_BAR_GREEN)
+            hp_text = f"{door.current_hp}/{door.max_hp}"
+        else:
+            _draw_status_bar(screen, door_x, bar_y, 0, 1, COLOR_HP_BAR_GREEN)
+            hp_text = "--/--"
+        screen.blit(self.small_font.render(hp_text, True, COLOR_HUD_TEXT), (door_x + HUD_BAR_WIDTH + 10, bar_y - 2))
 
         # --- ZOMBIE HP ---
-        if zombie:
-            _draw_status_bar(screen, HUD_BAR_X, HUD_Y_ZOMBIE, zombie.current_hp, zombie.max_hp, COLOR_HP_BAR_RED)
-            screen.blit(self.font.render("Zombie HP:", True, COLOR_HUD_TEXT), (HUD_X_OFFSET, HUD_Y_ZOMBIE - 5))
+        zombie_x = 620
+        screen.blit(self.font.render("ZOMBIE HP", True, COLOR_HUD_TEXT), (zombie_x, label_y))
+        if zombie is not None:
+            _draw_status_bar(screen, zombie_x, bar_y, zombie.current_hp, zombie.max_hp, COLOR_HP_BAR_RED)
+            zombie_text = f"{zombie.current_hp}/{zombie.max_hp}"
+        else:
+            _draw_status_bar(screen, zombie_x, bar_y, 0, 1, COLOR_HP_BAR_RED)
+            zombie_text = "--/--"
+        screen.blit(self.small_font.render(zombie_text, True, COLOR_HUD_TEXT), (zombie_x + HUD_BAR_WIDTH + 10, bar_y - 2))
 
         # --- ECTS ---
-        ects_info = f"ECTS: {ects.ects_balance} ({ects.ects_per_second}/s)"
-        screen.blit(self.font.render(ects_info, True, COLOR_HUD_TEXT), (HUD_X_OFFSET, HUD_Y_ECTS))
+        ects_x = 910
+        ects_text = f"ECTS: {ects.ects_balance} ({ects.ects_per_second}/s)"
+        screen.blit(self.font.render(ects_text, True, COLOR_HUD_TEXT), (ects_x, label_y))
 
         # --- TIME ---
         time_str = _format_time(total_time)
-        screen.blit(self.font.render(time_str, True, COLOR_HUD_TEXT), (screen.get_width() - 150, HUD_Y_DOOR - 5))
+        time_surface = self.font.render(time_str, True, COLOR_HUD_TEXT)
+        screen.blit(time_surface, (screen.get_width() - time_surface.get_width() - 20, label_y))

src/item.py

@@ -1,17 +1,27 @@
 import pygame
 import random
 from src.settings import (
-    ITEM_SPAWN_INTERVAL, ITEM_SHOPPING_TIMER, ITEM_SIZE,
-    COLOR_HP_BAR_YELLOW, COLOR_HP_BAR_BG
+    BEER_COST,
+    COFFEE_COST,
+    ITEM_SPAWN_INTERVAL,
+    ITEM_SHOPPING_TIMER,
+    ITEM_SIZE,
+    COLOR_HP_BAR_YELLOW,
+    COLOR_HP_BAR_BG,
 )
 
+ITEM_COSTS = {
+    "beer": BEER_COST,
+    "coffee": COFFEE_COST,
+}
+
 
 class Item:
     def __init__(self, x, y, item_type):
         self.x = x
         self.y = y
         self.item_type = item_type
-        self.cost = random.randint(5, 10)
+        self.cost = ITEM_COSTS.get(item_type, random.randint(5, 10))
 
         # collision rect for player (2 times item size for width and height)
         self.rect = pygame.Rect(self.x, self.y, ITEM_SIZE, ITEM_SIZE)
@@ -33,7 +43,7 @@ class Item:
         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):
+    def draw(self, screen, cam_x, cam_y, font=None):
         draw_x = self.x - cam_x
         draw_y = self.y - cam_y
 
@@ -51,6 +61,12 @@ class Item:
             pygame.draw.rect(screen, color, draw_rect)
             pygame.draw.rect(screen, COLOR_HP_BAR_BG, draw_rect, 2)
 
+        if font is not None:
+            cost_surface = font.render(f"{self.cost} ECTS", True, (255, 255, 255))
+            prompt_surface = font.render("E", True, (255, 255, 255))
+            screen.blit(cost_surface, (draw_x - 10, draw_y - cost_surface.get_height() - 2))
+            screen.blit(prompt_surface, (draw_x + ITEM_SIZE // 2 - prompt_surface.get_width() // 2, draw_y + ITEM_SIZE + 2))
+
     def get_cost(self):
         return self.cost
 
@@ -93,14 +109,7 @@ class ItemManager:
     def update(self, room_rect, blocked_rects):
         now = pygame.time.get_ticks()
 
-        remaining_items = []
-
-        for item in self.items:
-            if item.is_expired() == False:
-                remaining_items.append(item)
-
-        # replace the old list with the new temp_list
-        self.items = remaining_items
+        self.items = [item for item in self.items if not item.is_expired()]
 
         # spawn logic for new items
         if room_rect is not None:
@@ -116,9 +125,13 @@ class ItemManager:
     # check if player press "e" to buy
     def check_collect(self, player_rect, keys):
         if keys[pygame.K_e]:
-            for item in self.items:
-                if player_rect.colliderect(item.rect):
-                    return item
+            return self.get_touching_item(player_rect)
+        return None
+
+    def get_touching_item(self, player_rect):
+        for item in self.items:
+            if player_rect.colliderect(item.rect):
+                return item
         return None
 
     # delete item from list after buying it
@@ -127,9 +140,9 @@ class ItemManager:
             self.items.remove(item)
 
     # draw all active items
-    def draw(self, screen, cam_x, cam_y):
+    def draw(self, screen, cam_x, cam_y, font=None):
         for item in self.items:
-            item.draw(screen, cam_x, cam_y)
+            item.draw(screen, cam_x, cam_y, font)
 
     # clear items when changing room
     def clear(self):

src/monster.py

@@ -0,0 +1,386 @@
+"""Monster spawning and hallway movement behaviour."""
+
+from __future__ import annotations
+
+import random
+from collections import deque
+from typing import Callable, Iterable, Optional
+
+import pygame
+
+from src.actors import Actor, ActorSpriteSides
+from src.door import Door
+from src.settings import (
+    MONSTER_ATTACK_INTERVAL,
+    MONSTER_DOOR_DAMAGE,
+    MONSTER_HP,
+    MONSTER_MAX_COUNT,
+    MONSTER_SPAWN_INTERVAL,
+    MONSTER_SPEED,
+    tile_size,
+)
+
+WalkableCheck = Callable[[pygame.Vector2], bool]
+GridPosition = tuple[int, int]
+Position = tuple[int, int]
+
+
+class Monster:
+    """A spawned monster backed by a good/bad actor sprite pair."""
+
+    def __init__(
+        self,
+        actor: Actor,
+        *,
+        max_hp: int = MONSTER_HP,
+        speed: float = MONSTER_SPEED,
+    ) -> None:
+        self.actor = actor
+        self.actor.become_good()
+        self.max_hp = max_hp
+        self.current_hp = max_hp
+        self.speed = speed
+        self.last_attack_time = -MONSTER_ATTACK_INTERVAL
+
+    @property
+    def is_alive(self) -> bool:
+        return self.current_hp > 0
+
+    @property
+    def position(self) -> pygame.Vector2:
+        return self.actor.position
+
+    @property
+    def rect(self) -> pygame.Rect:
+        frame = self.actor.get_frame()
+        return frame.get_rect(midbottom=self._int_position(self.actor.position))
+
+    def take_damage(self, amount: int) -> None:
+        self.current_hp = max(0, self.current_hp - amount)
+
+    def sleep(self) -> None:
+        """Stay friendly/idling until the player triggers the room."""
+
+        self.actor.become_good()
+        self.actor.stop_walking()
+
+    def wake_up(self) -> None:
+        """Switch to the angry sprite when the player triggers a room."""
+
+        self.actor.become_bad()
+
+    def update(
+        self,
+        dt: float,
+        target_position: pygame.Vector2,
+        can_move_to: WalkableCheck,
+    ) -> None:
+        """Move toward the target, but only where ``can_move_to`` allows."""
+
+        if not self.is_alive:
+            self.actor.stop_walking()
+            return
+
+        movement = pygame.Vector2(target_position) - self.actor.position
+        if movement.length_squared() == 0:
+            self.actor.stop_walking()
+            self.actor.update_animation(dt)
+            return
+
+        self.face_position(target_position)
+
+        distance = movement.length()
+        max_distance = self.speed * dt
+        if distance > max_distance:
+            movement = movement.normalize() * max_distance
+
+        self.actor.move_by(movement)
+        if not can_move_to(self.actor.position):
+            self.actor.hit_wall()
+
+        self.actor.update_animation(dt)
+
+    def attack_door(self, door: Door) -> None:
+        """Damage the active door while standing outside it."""
+
+        self.wake_up()
+        self.actor.stop_walking()
+
+        now = pygame.time.get_ticks()
+        if now - self.last_attack_time >= MONSTER_ATTACK_INTERVAL:
+            door.take_damage(MONSTER_DOOR_DAMAGE)
+            self.last_attack_time = now
+
+    def face_position(self, target_position: pygame.Vector2) -> None:
+        movement = pygame.Vector2(target_position) - self.actor.position
+        if movement.length_squared() == 0:
+            return
+
+        if abs(movement.x) > abs(movement.y):
+            self.actor.direction = "right" if movement.x > 0 else "left"
+        else:
+            self.actor.direction = "down" if movement.y > 0 else "up"
+
+    def draw(self, surface: pygame.Surface) -> pygame.Rect:
+        return self.actor.draw(surface)
+
+    @staticmethod
+    def _int_position(position: pygame.Vector2) -> tuple[int, int]:
+        return round(position.x), round(position.y)
+
+
+class MonsterManager:
+    """Loads monster sprites, spawns monsters on H hallway tiles, and updates them."""
+
+    def __init__(
+        self,
+        sprite_sides: Iterable[ActorSpriteSides],
+        game_map,
+        *,
+        max_monsters: int = MONSTER_MAX_COUNT,
+        spawn_interval_ms: int = MONSTER_SPAWN_INTERVAL,
+    ) -> None:
+        self.sprite_sides = list(sprite_sides)
+        self.map = game_map
+        self.max_monsters = max_monsters
+        self.spawn_interval_ms = spawn_interval_ms
+        self.monsters: list[Monster] = []
+        self.last_spawn_time = pygame.time.get_ticks()
+        self.active_target_tile: Optional[GridPosition] = None
+        self.active_door: Optional[Door] = None
+
+        if not self.sprite_sides:
+            raise RuntimeError("No normal_*/angry_* monster sprite pairs found in assets/")
+
+    @property
+    def actors(self) -> list[Actor]:
+        return [monster.actor for monster in self.monsters]
+
+    def spawn_initial(self, blocked_rects: Optional[list[pygame.Rect]] = None) -> None:
+        """Fill the game with the starting monsters on H hallway tiles."""
+
+        blockers = list(blocked_rects or [])
+        while len(self.monsters) < self.max_monsters:
+            monster = self.spawn_monster(blockers)
+            if monster is None:
+                break
+            blockers.append(monster.rect)
+
+        self.last_spawn_time = pygame.time.get_ticks()
+
+    def activate_for_room(self, room_rect: pygame.Rect, door: Door) -> None:
+        """Wake monsters and send them to the hallway side of this room's door."""
+
+        target_tile = self.get_hall_tile_at_room_door(room_rect)
+        if target_tile is None:
+            return
+
+        self.active_target_tile = target_tile
+        self.active_door = door
+        for monster in self.monsters:
+            monster.wake_up()
+
+    def update(
+        self,
+        dt: float,
+        player_position: pygame.Vector2,
+        is_position_walkable: WalkableCheck,
+        blocked_rects: Optional[list[pygame.Rect]] = None,
+    ) -> None:
+        self.monsters = [monster for monster in self.monsters if monster.is_alive]
+
+        if self.active_target_tile is None:
+            for monster in self.monsters:
+                monster.sleep()
+        else:
+            for monster in self.monsters:
+                waypoint = self.get_next_waypoint(monster, self.active_target_tile)
+                if self.position_to_tile(monster.position) == self.active_target_tile:
+                    if self.active_door is not None and self.active_door.is_closed:
+                        monster.attack_door(self.active_door)
+                    else:
+                        monster.actor.stop_walking()
+                else:
+                    monster.wake_up()
+                    monster.update(dt, waypoint, self.is_hall_position)
+
+        now = pygame.time.get_ticks()
+        if len(self.monsters) < self.max_monsters and now - self.last_spawn_time >= self.spawn_interval_ms:
+            monster = self.spawn_monster(blocked_rects)
+            if monster is not None and self.active_target_tile is not None:
+                monster.wake_up()
+            self.last_spawn_time = now
+
+    def get_hall_tile_at_room_door(self, room_rect: pygame.Rect) -> Optional[GridPosition]:
+        """Find the H tile directly outside the D-door of ``room_rect``."""
+
+        door_tiles: list[GridPosition] = []
+        for row_index, row in enumerate(self.map.map):
+            for column_index, tile in enumerate(row):
+                if tile != "D":
+                    continue
+
+                tile_center_x = column_index * tile_size + tile_size // 2
+                tile_center_y = row_index * tile_size + tile_size // 2
+                if (
+                    room_rect.left <= tile_center_x <= room_rect.right
+                    and room_rect.bottom <= tile_center_y <= room_rect.bottom + 2 * tile_size
+                ):
+                    door_tiles.append((column_index, row_index))
+
+        hall_tiles: list[GridPosition] = []
+        for door_tile in door_tiles:
+            for neighbor in self.get_neighbors(door_tile, allowed_tiles={"H"}):
+                hall_tiles.append(neighbor)
+
+        if not hall_tiles:
+            return None
+
+        room_center_tile = (room_rect.centerx // tile_size, room_rect.centery // tile_size)
+        return min(
+            hall_tiles,
+            key=lambda tile: abs(tile[0] - room_center_tile[0]) + abs(tile[1] - room_center_tile[1]),
+        )
+
+    def get_next_waypoint(self, monster: Monster, target_tile: GridPosition) -> pygame.Vector2:
+        """Return the next H-tile center on a BFS path to the target tile."""
+
+        start_tile = self.position_to_tile(monster.position)
+        if start_tile == target_tile:
+            return self.tile_center(target_tile)
+
+        path = self.find_hall_path(start_tile, target_tile)
+        if len(path) >= 2:
+            return self.tile_center(path[1])
+        if len(path) == 1:
+            return self.tile_center(path[0])
+
+        return monster.position.copy()
+
+    def find_hall_path(self, start: GridPosition, target: GridPosition) -> list[GridPosition]:
+        """Find a path using only H hallway tiles. D doors are never traversed."""
+
+        if self.map.get_tile(*start) != "H" or self.map.get_tile(*target) != "H":
+            return []
+
+        queue: deque[GridPosition] = deque([start])
+        came_from: dict[GridPosition, Optional[GridPosition]] = {start: None}
+
+        while queue:
+            current = queue.popleft()
+            if current == target:
+                break
+
+            for neighbor in self.get_neighbors(current, allowed_tiles={"H"}):
+                if neighbor in came_from:
+                    continue
+                came_from[neighbor] = current
+                queue.append(neighbor)
+
+        if target not in came_from:
+            return []
+
+        path = [target]
+        while path[-1] != start:
+            previous = came_from[path[-1]]
+            if previous is None:
+                break
+            path.append(previous)
+
+        path.reverse()
+        return path
+
+    def get_neighbors(
+        self,
+        tile: GridPosition,
+        *,
+        allowed_tiles: set[str],
+    ) -> list[GridPosition]:
+        column, row = tile
+        neighbors: list[GridPosition] = []
+        for next_column, next_row in (
+            (column + 1, row),
+            (column - 1, row),
+            (column, row + 1),
+            (column, row - 1),
+        ):
+            if self.map.get_tile(next_column, next_row) in allowed_tiles:
+                neighbors.append((next_column, next_row))
+        return neighbors
+
+    def is_hall_position(self, position: pygame.Vector2) -> bool:
+        """Monsters may move only on H hallway tiles, never through D doors."""
+
+        return self.map.get_tile(*self.position_to_tile(position)) == "H"
+
+    def spawn_monster(self, blocked_rects: Optional[list[pygame.Rect]] = None) -> Optional[Monster]:
+        """Spawn one monster on a random H hallway tile if a free tile exists."""
+
+        if len(self.monsters) >= self.max_monsters:
+            return None
+
+        blockers = list(blocked_rects or [])
+        blockers.extend(monster.rect for monster in self.monsters)
+
+        sprite_sides = list(self.sprite_sides)
+        random.shuffle(sprite_sides)
+
+        for sides in sprite_sides:
+            position = self._random_position_on_hall_tile(sides.bad.frames["down"][1], blockers)
+            if position is None:
+                continue
+
+            actor = Actor.from_sides(sides, position)
+            monster = Monster(actor)
+            self.monsters.append(monster)
+            return monster
+
+        return None
+
+    def draw(self, surface: pygame.Surface) -> list[pygame.Rect]:
+        return [monster.draw(surface) for monster in sorted(self.monsters, key=lambda item: item.position.y)]
+
+    def clear(self) -> None:
+        self.monsters = []
+        self.last_spawn_time = pygame.time.get_ticks()
+        self.active_target_tile = None
+        self.active_door = None
+
+    def _random_position_on_hall_tile(
+        self,
+        frame: pygame.Surface,
+        blocked_rects: list[pygame.Rect],
+    ) -> Optional[Position]:
+        hall_tiles = self.get_all_hall_tiles()
+        random.shuffle(hall_tiles)
+
+        for column, row in hall_tiles:
+            position = self.tile_center((column, row))
+            rect = frame.get_rect(midbottom=(round(position.x), round(position.y)))
+
+            if any(rect.colliderect(blocker) for blocker in blocked_rects):
+                continue
+
+            return round(position.x), round(position.y)
+
+        return None
+
+    def get_all_hall_tiles(self) -> list[GridPosition]:
+        hall_tiles: list[GridPosition] = []
+        for row_index, row in enumerate(self.map.map):
+            for column_index, tile in enumerate(row):
+                if tile == "H":
+                    hall_tiles.append((column_index, row_index))
+        return hall_tiles
+
+    @staticmethod
+    def position_to_tile(position: pygame.Vector2) -> GridPosition:
+        return int(position.x // tile_size), int(position.y // tile_size)
+
+    @staticmethod
+    def tile_center(tile: GridPosition) -> pygame.Vector2:
+        column, row = tile
+        return pygame.Vector2(
+            column * tile_size + tile_size // 2,
+            row * tile_size + tile_size // 2,
+        )

src/settings.py

@@ -11,17 +11,16 @@ DESK_HEIGHT = 40
 DOOR_WIDTH = 20
 DOOR_HEIGHT = 100
 DOOR_BORDER_WIDTH = 3
+DOOR_HP = 100
 
 COLOR_DOOR_BEIGE = (245, 245, 220)
 COLOR_DOOR_BORDER = (100, 90, 80)
 
-
 # --- PLAYER ---
 # Players Constants / Settings
 # Valid movement/animation directions.
 Direction = Literal["down", "left", "right", "up"]
 
-
 # --- SPRITE ---
 # Sprite files are grouped by direction.
 # Example: "down" uses sprite_01.png, sprite_02.png, sprite_03.png.
@@ -36,26 +35,22 @@ DIRECTION_FRAMES: Mapping[Direction, Tuple[int, int, int]] = {
 DEFAULT_SPRITE_HEIGHT: int = 138
 DEFAULT_FRAME_TIME: float = 0.16
 
-
 # --- ECTS ---
-START_ECTS_VALUE = 1        # how many ECTS are generated at the beginning
-ECTS_UPDATE_INTERVAL = 1000     # time in ms (1000 = 1 sec)
+START_ECTS_VALUE = 1  # how many ECTS are generated at the beginning
+ECTS_UPDATE_INTERVAL = 1000  # time in ms (1000 = 1 sec)
 
 BEER_BOTTLE_ECTS_VALUE = 2
 BEER_COST = 50
 
-
 # --- BUTTONS ---
 COLOR_BUTTON = (0, 255, 0)
 COLOR_BUTTON_HOVER = (200, 255, 0)
 
-
 # --- STARTSCREEN ---
 COLOR_STARTSCREEN_BACKGROUND = (0, 0, 0)
 COLOR_STARTSCREEN_FONT_TITLE = (0, 255, 0)
 COLOR_STARTSCREEN_FONT_LABEL = (0, 255, 255)
 
-
 # --- ENDSCREEN ---
 COLOR_ENDSCREEN_BACKGROUND = (0, 0, 0)
 COLOR_ENDSCREEN_TEXT = (255, 255, 255)
@@ -63,30 +58,22 @@ COLOR_ENDSCREEN_WIN = (0, 255, 0)
 COLOR_ENDSCREEN_LOSE = (255, 0, 0)
 FONT_ENDSCREEN = "Arial"
 
-
 # --- COFFEE ---
 COFFEE_COST = 30
 COFFEE_HEAL_VALUE = 30
 
-
 # --- TOWER ---
-TOWER_COST = 150
-PROJECTILE_DMG = 15
+TOWER_COST = 10
+PROJECTILE_DMG = 7
 PROJECTILE_SPEED = 7
 COLOR_PROJECTILE = (200, 200, 0)
-TOWER_TIMER = 30000             # how long the tower stays and attack before it disappears
-tower_size = 30
-projectile_size = 8
-fire_interval = 1000 # ms
-respawn_delay = 10000 # ms
-
+TOWER_TIMER = 30000  # how long the tower stays and attack before it disappears
 
 # --- ITEM SPAWN TIMER ---
-ITEM_SPAWN_INTERVAL = 5000      # ms until a new item spawns
-ITEM_SHOPPING_TIMER = 10000     # how long you have time to buy items before they despawn
+ITEM_SPAWN_INTERVAL = 5000  # ms until a new item spawns
+ITEM_SHOPPING_TIMER = 10000  # how long you have time to buy items before they despawn
 ITEM_SIZE = 30
 
-
 # --- ZOMBIE ---
 ZOMBIE_EASY_HP = 30
 ZOMBIE_EASY_DMG = 3
@@ -97,6 +84,13 @@ ZOMBIE_MEDIUM_DMG = 7
 ZOMBIE_HARD_HP = 120
 ZOMBIE_HARD_DMG = 12
 
+# --- MONSTERS ---
+MONSTER_HP = ZOMBIE_MEDIUM_HP
+MONSTER_MAX_COUNT = 1
+MONSTER_SPAWN_INTERVAL = 8000  # ms until a replacement monster spawns
+MONSTER_SPEED = 90.0
+MONSTER_DOOR_DAMAGE = ZOMBIE_MEDIUM_DMG
+MONSTER_ATTACK_INTERVAL = 1000  # ms between door attacks
 
 # --- HUD ---
 HUD_FONT = "Arial"
@@ -118,8 +112,8 @@ PLAYER_SPEED = 180.0
 DEMO_ACTOR_HEIGHT = tile_size * 3
 FPS = 60
 
-HUD_X_OFFSET = 20               # left startpoint for texts
-HUD_BAR_X = 150                 # left startpoint for hp bars
+HUD_X_OFFSET = 20  # left startpoint for texts
+HUD_BAR_X = 150  # left startpoint for hp bars
 
 HUD_Y_DOOR = 20
 HUD_Y_ZOMBIE = 50

src/shop.py

@@ -10,6 +10,9 @@ class Shop:
 
     def buy(self, item_name):
         item_to_buy = self.get_item(item_name)
+        return self.buy_item(item_to_buy)
+
+    def buy_item(self, item_to_buy):
         if item_to_buy is None:
             return False
 

src/tower.py

@@ -1,181 +1,174 @@
-import pygame
-import random
 import math
-from src.settings import TOWER_COST, PROJECTILE_DMG, PROJECTILE_SPEED, COLOR_PROJECTILE, TOWER_TIMER, projectile_size, tower_size, fire_interval, respawn_delay
+import random
+from typing import Optional
 
-tower_size = 30             # Größe Tower Feld in Pixel
-projectile_size = 8         # Größe Projektil in Pixel
-fire_interval = 1000        # ms zwischen Schüssen
-respawn_delay = 10000       # ms bis neues Feld spawnt
+import pygame
 
+from src.settings import (
+    COLOR_PROJECTILE,
+    PROJECTILE_DMG,
+    PROJECTILE_SPEED,
+    TOWER_COST,
+    TOWER_TIMER,
+)
+
+
+tower_size = 30
+projectile_size = 20
+fire_interval = 1000  # ms zwischen Schüssen
 
 
 class Tower:
-    def __init__(self, sound_manager) -> None:
+    def __init__(self, sound_manager=None) -> None:
         self.sound_manager = sound_manager
-
-        # Feld und Tower -> None wenn nicht aktiv
-        # Position interagierbares Feld
-        self.field_rect: pygame.Rect = None
-        #Position des gebauten Tower
-        self.tower_rect: pygame.Rect = None
-        # Lister aller aktiven Projektile - dict mit Position und Geschwindigkeit
-        self.projectiles: list[dict] = []
-        # Zeitpunkt, wann der Tower gebaut wurde
-        self.tower_start: int = None
-        # Zeitpunkt, wann Tower despawnt ist
-        self.despawn_time: int = None
-        # Zeitpunkt des letzten Schusses
+        self.tower_rect: Optional[pygame.Rect] = None
+        self.projectiles: list[dict[str, float]] = []
+        self.tower_start: Optional[int] = None
         self.last_shot: int = 0
 
-        # Sprite laden für den Tower
         try:
             self.tower_image = pygame.image.load("assets/items/tower.png").convert_alpha()
             self.tower_image = pygame.transform.scale(self.tower_image, (tower_size, tower_size))
-        except Exception as e:
-            print(f"Error loading tower sprite: {e}")
+        except Exception as error:
+            print(f"Error loading tower sprite: {error}")
             self.tower_image = None
 
-        # Sprite laden für Projektil
         try:
             self.projectile_image = pygame.image.load("assets/items/book.png").convert_alpha()
-            self.projectile_image = pygame.transform.scale(self.projectile_image, (projectile_size, projectile_size))
-        except Exception as e:
-            print(f"Error loading projectile sprite: {e}")
+            self.projectile_image = pygame.transform.scale(
+                self.projectile_image,
+                (projectile_size, projectile_size),
+            )
+        except Exception as error:
+            print(f"Error loading projectile sprite: {error}")
             self.projectile_image = None
 
-    # soll interaktives Tower Feld an zufälliger freier Position im Raum spawnen
-    def field_spawn(self, room_rect: pygame.Rect, blocked_rects: list[pygame.Rect]):
-        # versucht bis zu 50 mal, eine nicht belegte Stelle im Raum zu finden
-        for i in range(50):
-            x = random.randint(room_rect.left + tower_size, room_rect.right - tower_size * 2)
-            y = random.randint(room_rect.top + tower_size, room_rect.bottom - tower_size * 2)
-            rect = pygame.Rect(x, y, tower_size, tower_size)
+    def try_spawn(self, room_rect: Optional[pygame.Rect], blocked_rects: list[pygame.Rect], ects) -> bool:
+        """Spawn and pay for one tower when the player has enough ECTS."""
 
-            # freie Position finden - nicht auf dem Tisch oder blockierten Rects
-            if not any(rect.colliderect(b) for b in blocked_rects):
-                self.field_rect = rect
-                return
+        if room_rect is None or self.tower_rect is not None:
+            return False
+        if ects.ects_balance < TOWER_COST:
+            return False
 
-    # Baut Tower wenn Spieler E drückt, auf Feld steht und genug ects hat
-    def try_build(self, player_rect: pygame.Rect, keys: pygame.key.ScancodeWrapper, ects):
+        rect = self._random_free_rect(room_rect, blocked_rects)
+        if rect is None:
+            self._play_sfx("buy_fail")
+            return False
 
-            # bricht ab wenn kein Feld vorhanden ist oder ein Tower bereits aktiv ist
-            if not self.field_rect or self.tower_rect:
-                return False
-            # prüft alle Bedingungen gleichzeitig
-            if not (self.field_rect.colliderect(player_rect) and keys[pygame.K_e] and ects.balance >= TOWER_COST):
-                self.sound_manager.play_sfx("buy_fail")
-                return False
+        ects.decrease_balance(TOWER_COST)
+        self.tower_rect = rect
+        self.tower_start = pygame.time.get_ticks()
+        self.projectiles = []
+        self._play_sfx("buy_success")
+        return True
 
-            # ECTS abziehen und Tower bauen
-                self.sound_manager.play_sfx("buy_success")
-            ects.balance -= TOWER_COST
-            self.tower_rect = self.field_rect
-            self.field_rect = None
-            self.tower_start = pygame.time.get_ticks()
-            return True
-
-    # ruft jeden Frame auf und gibt den Schaden auf Monster zurück
-    # verwaltet Schüsse, Projektile, Tower-Leben und Respawn
-    def update(self, player_rect: pygame.Rect, keys: pygame.key.ScancodeWrapper, ects, monster_rect: pygame.Rect, room_rect: pygame.Rect, blocked_rects: list[pygame.Rect]):
+    def update(
+        self,
+        room_rect: Optional[pygame.Rect],
+        blocked_rects: list[pygame.Rect],
+        ects,
+        monster_rect: Optional[pygame.Rect],
+    ) -> int:
+        """Update tower spawning/shooting and return damage dealt to the monster."""
 
         now = pygame.time.get_ticks()
         total_damage = 0
 
-        # versucht, den Tower zu bauen wenn der Spieler auf dem Feld steht
-        self.try_build(player_rect, keys, ects)
+        self.try_spawn(room_rect, blocked_rects, ects)
 
-        # schießen dann, wenn Tower aktiv und Monster vorhanden sind
-        if self.tower_rect and monster_rect:
+        if self.tower_rect is not None and monster_rect is not None:
             if now - self.last_shot >= fire_interval:
-                #berechnet Richtungsvektor vom Tower zum Monster
-                dx = monster_rect.centerx - self.tower_rect.centerx
-                dy = monster_rect.centery - self.tower_rect.centery
-                distance = math.sqrt(dx * dx + dy * dy) or 1
-
-                # fügt neues Projektil mit Startposition und Geschwindigkeit hinzu
-                self.projectiles.append({
-                    "x": float(self.tower_rect.centerx),
-                    "y": float(self.tower_rect.centery),
-                    "vel_x": (dx / distance) * PROJECTILE_SPEED,
-                    "vel_y": (dy / distance) * PROJECTILE_SPEED,
-                })
-
-                self.sound_manager.play_sfx("tower_shoot")
+                self._shoot_at(monster_rect)
                 self.last_shot = now
 
-        # Bewegung der Projektile und Kollision mit Monster prüfen
-        for p in self.projectiles[:]:       # [:] = Kopie der Liste, dass man sicher löschen kann
-            p["x"] += p["vel_x"]
-            p["y"] += p["vel_y"]
+        for projectile in self.projectiles[:]:
+            projectile["x"] += projectile["vel_x"]
+            projectile["y"] += projectile["vel_y"]
 
-            # Projektil trifft auf Monster -> Schaden wird addiert und Projektil entfernt
-            if monster_rect and pygame.Rect(int(p["x"]), int(p["y"]), projectile_size, projectile_size).colliderect(monster_rect):
+            projectile_rect = pygame.Rect(
+                int(projectile["x"]),
+                int(projectile["y"]),
+                projectile_size,
+                projectile_size,
+            )
+            if monster_rect is not None and projectile_rect.colliderect(monster_rect):
                 total_damage += PROJECTILE_DMG
-                self.sound_manager.play_sfx("monster_hit")
-                self.projectiles.remove(p)
+                self.projectiles.remove(projectile)
+                self._play_sfx("monster_hit")
 
-        # wenn der Tower abgelaufen ist, soll er despawnen und ein Timer starten
-        if self.tower_rect and self.tower_start and now - self.tower_start >= TOWER_TIMER:
-            self.tower_rect = None
-            self.despawn_time = now
-            self.projectiles = []
-
-        # ein neues Feld soll spawnen nach dem Respawn Delay
-        if not self.tower_rect and not self.field_rect and self.despawn_time:
-            if now - self.despawn_time >= respawn_delay:
-                self.field_spawn(room_rect, blocked_rects)
-                self.despawn_time = None
+        if self.tower_rect is not None and self.tower_start is not None:
+            if now - self.tower_start >= TOWER_TIMER:
+                self.clear()
 
         return total_damage
 
+    def draw(self, surface: pygame.Surface, font: pygame.font.Font, cam_x: int = 0, cam_y: int = 0) -> None:
+        if self.tower_rect is not None and self.tower_start is not None:
+            draw_rect = pygame.Rect(
+                self.tower_rect.x - cam_x,
+                self.tower_rect.y - cam_y,
+                tower_size,
+                tower_size,
+            )
 
-    # Zeichnet Feld, Tower und Projektile auf dem Bildschirm
-    def draw(self, surface: pygame.Surface, font: pygame.font.Font, cam_x: int = 0, cam_y: int = 0):
-        # Feld zeichnen - goldenes Rechteck mit "T" als Hinweis
-        if self.field_rect:
-            r = pygame.Rect(self.field_rect.x - cam_x, self.field_rect.y - cam_y, tower_size, tower_size)
-            pygame.draw.rect(surface, (160,120,30), r)
-            pygame.draw.rect(surface, (220,180,60), r, 2)
-            surface.blit(font.render("T", True, (255, 255, 255)), (r.x + 12, r.y + 10))
+            seconds_left = max(0, TOWER_TIMER - (pygame.time.get_ticks() - self.tower_start)) // 1000
 
-        # Tower Zeichnen mit Sprite - als Fallback grünes Rechteck
-        if self.tower_rect and self.tower_start:
-            r = pygame.Rect(self.tower_rect.x - cam_x, self.tower_rect.y - cam_y, tower_size, tower_size)
-
-            # berechnet die verbleibende Zeit in Sekunden
-            sec = max(0, TOWER_TIMER - (pygame.time.get_ticks() - self.tower_start)) // 1000
-
-            if self.tower_image:
-                # Sprite verfügbar -> zeichnen
-                surface.blit(self.tower_image, r)
+            if self.tower_image is not None:
+                surface.blit(self.tower_image, draw_rect)
             else:
-                # kein Sprite -> Fallback grünes Rechteck
-                pygame.draw.rect(surface, (40, 160, 80), r)
-                pygame.draw.rect(surface, (80, 220, 120), r, 2)
+                pygame.draw.rect(surface, (40, 160, 80), draw_rect)
+                pygame.draw.rect(surface, (80, 220, 120), draw_rect, 2)
 
-            # Restzeit der Tower über dem Sprite anzeigen (in Sekunden)
-            surface.blit(font.render(str(sec), True, (255, 255, 255)), (r.x + 8, r.y - 18))
+            surface.blit(font.render(str(seconds_left), True, (255, 255, 255)), (draw_rect.x + 8, draw_rect.y - 18))
 
-        # alle aktiven Projektile zeichnen als Prite oder Fallback als kleine Rechtecke
-        for p in self.projectiles:
-            draw_x = int(p["x"]) - cam_x
-            draw_y = int(p["y"]) - cam_y
-
-            if self.projectile_image:
-                # zeichnet Buch Sprite
-                surface.blit(self.projectile_image, (draw_x, draw_y))
+        for projectile in self.projectiles:
+            projectile_rect = pygame.Rect(
+                int(projectile["x"]) - cam_x,
+                int(projectile["y"]) - cam_y,
+                projectile_size,
+                projectile_size,
+            )
+            if self.projectile_image is not None:
+                surface.blit(self.projectile_image, projectile_rect)
             else:
-                # Fallback - gelbes Rechteck
-                pygame.draw.rect(surface, COLOR_PROJECTILE,
-                    pygame.Rect(draw_x, draw_y, projectile_size, projectile_size))
+                pygame.draw.rect(surface, COLOR_PROJECTILE, projectile_rect)
 
-
-
-    # alles zurücksetzen, wenn der Raum verlassen wird
     def clear(self) -> None:
-        self.field_rect = None
         self.tower_rect = None
         self.projectiles = []
-        self.despawn_time = None
+        self.tower_start = None
+        self.last_shot = 0
+
+    def _shoot_at(self, monster_rect: pygame.Rect) -> None:
+        if self.tower_rect is None:
+            return
+
+        dx = monster_rect.centerx - self.tower_rect.centerx
+        dy = monster_rect.centery - self.tower_rect.centery
+        distance = math.sqrt(dx * dx + dy * dy) or 1
+        self.projectiles.append(
+            {
+                "x": float(self.tower_rect.centerx),
+                "y": float(self.tower_rect.centery),
+                "vel_x": (dx / distance) * PROJECTILE_SPEED,
+                "vel_y": (dy / distance) * PROJECTILE_SPEED,
+            }
+        )
+        self._play_sfx("tower_shoot")
+
+    def _play_sfx(self, name: str) -> None:
+        if self.sound_manager is not None:
+            self.sound_manager.play_sfx(name)
+
+    @staticmethod
+    def _random_free_rect(room_rect: pygame.Rect, blocked_rects: list[pygame.Rect]) -> Optional[pygame.Rect]:
+        for _ in range(50):
+            x = random.randint(room_rect.left + tower_size, room_rect.right - tower_size * 2)
+            y = random.randint(room_rect.top + tower_size, room_rect.bottom - tower_size * 2)
+            rect = pygame.Rect(x, y, tower_size, tower_size)
+
+            if not any(rect.colliderect(blocked) for blocked in blocked_rects):
+                return rect
+
+        return None