extends CharacterBody3D

@export var move_speed: float = 5.0
@export var gravity: float = 9.8
@export var max_health: int = 10
@export var attack_damage: int = 1
@export var attack_range: float = 1.0
@export var attack_cooldown: float = 0.5

signal health_changed(current: int, max: int)

var camera_rig: Node3D
var health: int
var is_dead: bool = false

var _attack_cooldown_left: float = 0.0
var _click_move_target: Vector3 = Vector3.ZERO
var _click_move_active: bool = false

@onready var sprite: AnimatedSprite3D = $AnimatedSprite3D
# Nur in world/island.tscn vorhanden, nicht in diesem Debug-Prototyp -> optional
@onready var equipment: Equipment = get_node_or_null("Equipment")

func _ready() -> void:
	camera_rig = get_tree().get_first_node_in_group("camera_rig")
	if camera_rig == null:
		push_error("CameraRig nicht gefunden! Gruppe 'camera_rig' gesetzt?")
	health = max_health

# Diablo-artig: Linksklick bewegt zusätzlich zu WASD, Leertaste greift an.
# Läuft über _unhandled_input, damit ein offenes Interaktions-Menü (Buttons
# verbrauchen den Klick/die Leertaste zuerst) automatisch Vorrang hat.
func _unhandled_input(event: InputEvent) -> void:
	if InteractionManager.active:
		return
	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT and event.pressed:
		_try_click_move(event.position)
	elif event.is_action_pressed("attack"):
		_try_attack()

func _try_click_move(screen_pos: Vector2) -> void:
	if camera_rig == null:
		return
	var cam: Camera3D = camera_rig.camera
	var from := cam.project_ray_origin(screen_pos)
	var dir := cam.project_ray_normal(screen_pos)
	var space_state := get_world_3d().direct_space_state
	var query := PhysicsRayQueryParameters3D.create(from, from + dir * 1000.0)
	query.exclude = [get_rid()]
	var result := space_state.intersect_ray(query)
	if result:
		_click_move_target = result.position
		_click_move_active = true

func _try_attack() -> void:
	if _attack_cooldown_left > 0.0:
		return
	_attack_cooldown_left = attack_cooldown
	for enemy in get_tree().get_nodes_in_group("enemies"):
		if global_position.distance_to(enemy.global_position) <= attack_range:
			enemy.take_damage(attack_damage)

func take_damage(amount: int) -> void:
	if is_dead:
		return
	health = max(0, health - amount)
	health_changed.emit(health, max_health)
	if health <= 0:
		_die()

func heal_full() -> void:
	health = max_health
	health_changed.emit(health, max_health)

func _die() -> void:
	is_dead = true
	get_tree().change_scene_to_file("res://boot/game_over_screen.tscn")

func _physics_process(delta: float) -> void:
	# Bewegung sperren während Interaction
	if InteractionManager.active:
		velocity = Vector3.ZERO
		return
	if is_dead:
		return

	if _attack_cooldown_left > 0.0:
		_attack_cooldown_left -= delta

	# Schwerkraft
	if not is_on_floor():
		velocity.y -= gravity * delta

	# Eingabe
	var input_dir = Vector2(
		Input.get_axis("move_left", "move_right"),
		Input.get_axis("move_forward", "move_backward")
	)

	if input_dir != Vector2.ZERO:
		_click_move_active = false  # WASD hat Vorrang vor einem laufenden Klick-Ziel
		var cam_basis = camera_rig.global_transform.basis
		var forward = -cam_basis.z
		var right = cam_basis.x
		forward.y = 0
		right.y = 0
		forward = forward.normalized()
		right = right.normalized()

		var move_dir = (forward * -input_dir.y + right * input_dir.x).normalized()
		velocity.x = move_dir.x * move_speed
		velocity.z = move_dir.z * move_speed

		_update_animation(input_dir)
	elif _click_move_active:
		var to_target = _click_move_target - global_position
		to_target.y = 0
		if to_target.length() < 0.15:
			_click_move_active = false
			velocity.x = move_toward(velocity.x, 0, move_speed)
			velocity.z = move_toward(velocity.z, 0, move_speed)
			sprite.play("idle")
		else:
			var move_dir = to_target.normalized()
			velocity.x = move_dir.x * move_speed
			velocity.z = move_dir.z * move_speed
			# Weltrichtung zurück in die bestehende bildschirmrelative
			# Animationslogik übersetzen, statt eine zweite Logik zu bauen.
			var cam_basis = camera_rig.global_transform.basis
			var forward = -cam_basis.z
			var right = cam_basis.x
			forward.y = 0
			right.y = 0
			forward = forward.normalized()
			right = right.normalized()
			var screen_input := Vector2(move_dir.dot(right), -move_dir.dot(forward))
			_update_animation(screen_input)
	else:
		velocity.x = move_toward(velocity.x, 0, move_speed)
		velocity.z = move_toward(velocity.z, 0, move_speed)
		sprite.play("idle")

	move_and_slide()

func _update_animation(input_dir: Vector2) -> void:

	if input_dir.y > 0.1:
		sprite.play("move_down")
	elif input_dir.y < -0.1:
		sprite.play("move_up")
	elif input_dir.x > 0.1:
		sprite.play("move_right")
	elif input_dir.x < -0.1:
		sprite.play("move_left")
	else:
		sprite.play("idle")