extends Node

# EventBus - Centralized Observer Pattern for inter-manager communication
# Replaces direct cross-references between managers

# =============================================================================
# Events Registry
# =============================================================================

# Player Events
const EVENT_PLAYER_JOINED = "player_joined"
const EVENT_PLAYER_LEFT = "player_left"
const EVENT_PLAYER_READY = "player_ready"

# Match Events
const EVENT_MATCH_STARTED = "match_started"
const EVENT_MATCH_ENDED = "match_ended"
const EVENT_GAME_MODE_CHANGED = "game_mode_changed"

# Economy Events
const EVENT_CURRENCY_CHANGED = "currency_changed"
const EVENT_ITEM_PURCHASED = "item_purchased"
const EVENT_GACHA_PULL = "gacha_pull"

# Profile Events
const EVENT_PROFILE_LOADED = "profile_loaded"
const EVENT_PROFILE_UPDATED = "profile_updated"
const EVENT_AVATAR_CHANGED = "avatar_changed"

# Session Events
const EVENT_SESSION_REFRESHED = "session_refreshed"
const EVENT_SESSION_EXPIRED = "session_expired"

# =============================================================================
# Signal Bus
# =============================================================================

signal event_emitted(event_name: String, data: Variant)

# =============================================================================
# Internal Registry
# =============================================================================

var _listeners: Dictionary = {} # event_name -> Array[Callable]

# =============================================================================
# Public API
# =============================================================================

func emit(event_name: String, data: Variant = null) -> void:
	"""Emit an event to all registered listeners."""
	if _listeners.has(event_name):
		for callback in _listeners[event_name]:
			if data != null:
				callback.call(data)
			else:
				callback.call()
	event_emitted.emit(event_name, data)

func on(event_name: String, callback: Callable) -> void:
	"""Subscribe to an event."""
	if not _listeners.has(event_name):
		_listeners[event_name] = []
	_listeners[event_name].append(callback)

func off(event_name: String, callback: Callable) -> void:
	"""Unsubscribe from an event."""
	if _listeners.has(event_name):
		_listeners[event_name].erase(callback)

func clear() -> void:
	"""Remove all listeners. Useful for cleanup between scenes."""
	_listeners.clear()