class_name HealthComponent
extends Node

signal health_changed(current: int, maximum: int)
signal depleted

@export var maximum := 100
@export var current := 100
@export var hitstun_seconds := 0.4

var _hitstun_time_left := 0.0


func _ready() -> void:
	_emit_changed()


func _process(delta: float) -> void:
	if _hitstun_time_left <= 0.0:
		return
	_hitstun_time_left = maxf(0.0, _hitstun_time_left - delta)
	if _hitstun_time_left <= 0.0 and current > 0:
		var state_machine := _state_machine_or_null()
		if state_machine != null and state_machine.has_method("set_life_state"):
			state_machine.call("set_life_state", &"Alive")


func set_values(next_current: int, next_maximum: int) -> void:
	maximum = max(1, next_maximum)
	current = clampi(next_current, 0, maximum)
	if current > 0:
		_hitstun_time_left = 0.0
	_emit_changed()


func apply_damage(amount: int) -> void:
	if amount <= 0:
		return
	current = clampi(current - amount, 0, maximum)
	_emit_changed()
	if current == 0:
		depleted.emit()


func receive_hit(result: Dictionary) -> void:
	var amount := int(result.get("damage", result.get("amount", 0)))
	apply_damage(amount)
	var state_machine := _state_machine_or_null()
	if state_machine == null or not state_machine.has_method("set_life_state"):
		return
	if current <= 0:
		_hitstun_time_left = 0.0
		state_machine.call("set_life_state", &"Dead")
	elif amount > 0 and bool(result.get("interrupts", true)):
		_hitstun_time_left = maxf(0.0, hitstun_seconds)
		state_machine.call("set_life_state", &"Hitstun")


func heal(amount: int) -> void:
	if amount <= 0:
		return
	current = clampi(current + amount, 0, maximum)
	_emit_changed()


func _emit_changed() -> void:
	health_changed.emit(current, maximum)
	var bus := _event_bus_or_null()
	if bus != null and _is_player_health_component():
		bus.emit_signal("player_health_changed", current, maximum)


func _is_player_health_component() -> bool:
	var actor := get_parent()
	return actor != null and actor.name == "Player"


func _event_bus_or_null() -> Node:
	if not is_inside_tree():
		return null
	return get_tree().root.get_node_or_null("EventBus")


func _state_machine_or_null() -> Node:
	if not is_inside_tree():
		return null
	return get_node_or_null("../StateMachine")