Audio manager implementation

scripts/autoload/audio_manager.gd

@@ -0,0 +1,42 @@
+extends Node
+
+# ---------------------------------------------------------------------------
+# AudioManager — singleton for playing sound effects
+# Uses a pool of AudioStreamPlayers to allow overlapping sounds
+# ---------------------------------------------------------------------------
+
+const POOL_SIZE := 8
+
+# Preloaded sound effects
+var _sounds: Dictionary = {
+	"enemy_hit": preload("res://assets/audio/sfx/enemy_hit.wav"),
+	"player_hit": preload("res://assets/audio/sfx/player_hit.wav"),
+	"player_shoot": preload("res://assets/audio/sfx/player_shoot.wav"),
+	"explosion": preload("res://assets/audio/sfx/explosion.wav"),
+	"pickup_scrap": preload("res://assets/audio/sfx/pickup_scrap.wav"),
+	"item_pickup": preload("res://assets/audio/sfx/item_pickup.wav"),
+	"ui_click": preload("res://assets/audio/sfx/ui_click.wav"),
+	"ui_select": preload("res://assets/audio/sfx/ui_select.wav"),
+}
+
+var _pool: Array[AudioStreamPlayer] = []
+var _pool_index: int = 0
+
+func _ready() -> void:
+	process_mode = Node.PROCESS_MODE_ALWAYS
+	for i in POOL_SIZE:
+		var player := AudioStreamPlayer.new()
+		player.bus = "Master"
+		add_child(player)
+		_pool.append(player)
+
+func play(sound_name: String) -> void:
+	if not _sounds.has(sound_name):
+		push_warning("AudioManager: Unknown sound '%s'" % sound_name)
+		return
+
+	var player := _pool[_pool_index]
+	_pool_index = (_pool_index + 1) % POOL_SIZE
+
+	player.stream = _sounds[sound_name]
+	player.play()

scripts/enemies/currency_orb.gd

@@ -24,5 +24,6 @@ func _physics_process(delta: float) -> void:
 
 func _on_body_entered(body: Node) -> void:
 	if body.is_in_group("player"):
+		AudioManager.play("pickup_scrap")
 		RunManager.earn_credits(value)
 		queue_free()

scripts/enemies/enemy_base.gd

@@ -86,6 +86,7 @@ func get_slow_factor() -> float:
 func take_damage(amount: float) -> void:
 	current_health -= amount
 	_flash_timer = 0.1
+	AudioManager.play("enemy_hit")
 	if current_health <= 0.0:
 		_die()
 

scripts/items/run_item_pickup.gd

@@ -15,6 +15,7 @@ func _draw() -> void:
 func _on_body_entered(body: Node) -> void:
 	if not body.is_in_group("player") or item == null:
 		return
+	AudioManager.play("item_pickup")
 	RunManager.collect_item(item)  # Triggers item_collected signal -> player_stats recalculates
 	if item.heal_on_pickup > 0.0:
 		body.stats.heal(item.heal_on_pickup)

scripts/items/shop_item_pedestal.gd

@@ -68,6 +68,7 @@ func _attempt_purchase() -> void:
 		return
 
 	RunManager.spend_credits(price)
+	AudioManager.play("item_pickup")
 
 	var player := get_tree().get_first_node_in_group("player") as Node2D
 	if player == null:

scripts/player/player.gd

@@ -94,6 +94,7 @@ func _handle_shooting(delta: float) -> void:
 		_shoot_timer = 1.0 / stats.fire_rate
 
 func _fire(direction: Vector2) -> void:
+	AudioManager.play("player_shoot")
 	# Overclock: every 3rd shot deals 0 damage
 	var is_zeroed_shot := false
 	if stats.overclock:
@@ -201,6 +202,7 @@ func take_damage(amount: float) -> void:
 
 	stats.current_health -= actual
 	_iframe_timer = IFRAME_DURATION
+	AudioManager.play("player_hit")
 	EventBus.player_health_changed.emit(stats.current_health, stats.max_health)
 
 	# Reactive effects on taking damage

scripts/player/projectile.gd

@@ -76,6 +76,7 @@ func _on_body_entered(body: Node) -> void:
 # Explosive — AoE damage to all enemies in radius
 # ---------------------------------------------------------------------------
 func _explode() -> void:
+	AudioManager.play("explosion")
 	var space  := get_world_2d().direct_space_state
 	var query  := PhysicsShapeQueryParameters2D.new()
 	var circle := CircleShape2D.new()

scripts/ui/armory_ui.gd

@@ -82,13 +82,16 @@ func _input(event: InputEvent) -> void:
 
 	if event.is_action_pressed("ui_up"):
 		_cursor = wrapi(_cursor - 1, 0, maxi(1, _items.size()))
+		AudioManager.play("ui_select")
 		_refresh_labels()
 		get_viewport().set_input_as_handled()
 	elif event.is_action_pressed("ui_down"):
 		_cursor = wrapi(_cursor + 1, 0, maxi(1, _items.size()))
+		AudioManager.play("ui_select")
 		_refresh_labels()
 		get_viewport().set_input_as_handled()
 	elif event.is_action_pressed("ui_accept"):
+		AudioManager.play("ui_click")
 		_equip_selected()
 		get_viewport().set_input_as_handled()
 	elif event.is_action_pressed("ui_cancel"):

scripts/ui/atm_ui.gd

@@ -113,24 +113,24 @@ func _build_ui() -> void:
 
 	var dep_btn := Button.new()
 	dep_btn.text = "DEPOSIT\n(ON HAND → BANK)"
-	dep_btn.pressed.connect(_on_deposit)
+	dep_btn.pressed.connect(func(): AudioManager.play("ui_click"); _on_deposit())
 	action_row.add_child(dep_btn)
 
 	var wth_btn := Button.new()
 	wth_btn.text = "WITHDRAW\n(BANK → ON HAND)"
-	wth_btn.pressed.connect(_on_withdraw)
+	wth_btn.pressed.connect(func(): AudioManager.play("ui_click"); _on_withdraw())
 	action_row.add_child(wth_btn)
 
 	# Close
 	var close_btn := Button.new()
 	close_btn.text = "CLOSE"
-	close_btn.pressed.connect(close)
+	close_btn.pressed.connect(func(): AudioManager.play("ui_click"); close())
 	vbox.add_child(close_btn)
 
 func _add_btn(parent: Node, text: String, cb: Callable) -> void:
 	var b      := Button.new()
 	b.text      = text
-	b.pressed.connect(cb)
+	b.pressed.connect(func(): AudioManager.play("ui_click"); cb.call())
 	parent.add_child(b)
 
 # ---------------------------------------------------------------------------

scripts/ui/pause_menu.gd

@@ -43,7 +43,7 @@ func _add_button(parent: Node, text: String, callback: Callable) -> void:
 	var btn        := Button.new()
 	btn.text        = text
 	btn.custom_minimum_size = Vector2(240, 48)
-	btn.pressed.connect(callback)
+	btn.pressed.connect(func(): AudioManager.play("ui_click"); callback.call())
 	parent.add_child(btn)
 
 # ---------------------------------------------------------------------------

scripts/ui/run_end_screen.gd

@@ -53,7 +53,7 @@ func _show_victory() -> void:
 	var btn        := Button.new()
 	btn.text        = "RETURN TO HUB"
 	btn.position    = Vector2(-80, 70)
-	btn.pressed.connect(_fade_out_then_hub)
+	btn.pressed.connect(func(): AudioManager.play("ui_click"); _fade_out_then_hub())
 	_root.add_child(btn)
 
 	_fade_in()

scripts/upgrades/body_part_pickup.gd

@@ -7,5 +7,6 @@ func _ready() -> void:
 
 func _on_body_entered(body: Node) -> void:
 	if body.is_in_group("player") and part != null:
+		AudioManager.play("item_pickup")
 		UpgradeManager.acquire_part(part)
 		queue_free()