class_name EnemyStandoffComponent
extends Node

# Holds a preferred distance from the nearest player ship instead of
# ramming: advances when too far, retreats when too close, drifts
# laterally in the comfortable band between so it still reads as alive
# rather than frozen. Never pair with a pursuit component on the same
# enemy - the two would fight over velocity every tick.

var capability_id: String = "standoff"

@export var preferred_range: float = 620.0
@export var retreat_range_factor: float = 0.75

var velocity: Vector2 = Vector2.ZERO


func tick(delta: float) -> void:
	var enemy: Node2D = get_parent()
	var target: Node2D = _nearest_ship(enemy)
	if target == null:
		return
	var to_target: Vector2 = target.position - enemy.position
	var distance: float = to_target.length()
	if distance < 1.0:
		return
	var direction: Vector2 = to_target / distance
	var retreat_range: float = preferred_range * retreat_range_factor

	var desired_velocity: Vector2
	if distance > preferred_range:
		desired_velocity = direction * enemy.speed
	elif distance < retreat_range:
		desired_velocity = -direction * enemy.speed
	else:
		var lateral: Vector2 = Vector2(-direction.y, direction.x)
		desired_velocity = lateral * enemy.speed * 0.5

	velocity = velocity.move_toward(desired_velocity, enemy.acceleration * delta)
	enemy.position += velocity * delta

	if velocity.length() > 5.0:
		var target_angle: float = velocity.angle() + PI / 2.0
		enemy.rotation = lerp_angle(enemy.rotation, target_angle, enemy.rotation_speed * delta)


func _nearest_ship(enemy: Node2D) -> Node2D:
	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
	if fleet == null or fleet.ships.is_empty():
		return null
	var nearest: Node2D = fleet.ships[0]
	var best_dist: float = enemy.position.distance_to(nearest.position)
	for ship in fleet.ships:
		var d: float = enemy.position.distance_to(ship.position)
		if d < best_dist:
			best_dist = d
			nearest = ship
	return nearest