class_name Enemy extends Unit

@export var player: Player
@export var chasing_range := 30.0
@export var attack_range := 3.0
@export var attacks := ["Unarmed_Melee_Attack_Punch_A", "Unarmed_Melee_Attack_Punch_B", "Unarmed_Melee_Attack_Kick"]

@onready var nav_agent: NavigationAgent3D = $NavigationAgent3D

func _ready() -> void:
	health = maximum_health
	stamina = maximum_stamina
	state_changed.connect(_on_state_changed)

func _physics_process(_delta: float) -> void:
	if state == States.dead or player == null:
		return
	if player.state == States.dead:
		state = States.idle
		return
	
	var distance: float = global_position.distance_to(player.global_position)
	if distance > chasing_range:
		state = States.idle
	elif distance <= chasing_range and distance >= attack_range:
		state = States.chasing
	elif distance <= attack_range:
		state = States.attacking

	nav_agent.set_target_position(player.position)
	if nav_agent.is_navigation_finished() or nav_agent.is_target_reached(): 
		return
	move_and_slide()


func _on_state_changed(_old_state: States, new_state: States) -> void:
	#if new_state == _old_state: 
		#return
	name_changed.emit(unit_name, States.keys()[new_state])
	print("Enemy changed state from " + str(_old_state) + " to " + str(new_state))
	match new_state:
		#States.idle:
			# TODO: Random movement
			#_on_velocity_computed(Vector3.ZERO)

		States.chasing:
			print("Player position: ", player.position)
			var next_path_position: Vector3 = nav_agent.get_next_path_position()
			print("Next path position: ", next_path_position)
			print("Global position: ", global_position)
			model.look_at(next_path_position)
			var direction = global_position.direction_to(next_path_position)
			velocity = Vector3(direction.x, 0, direction.z).normalized() * speed
			var vy: float = direction.y
			velocity.y = 0
			var vl: Vector3 = velocity * model.transform.basis
			var iwr := Vector2(vl.x, -vl.z) / speed
			anim_tree.set("parameters/IWR/blend_position", iwr)
			velocity.y = vy
			print("velocity = ", velocity)
	
		States.attacking:
			if enough_stamina_available(attack_cost):
				use_stamina(attack_cost)
				if attacks.size() > 0:
					anim_state.travel(attacks.pick_random())

		States.dead:
			player.gold += 100