class_name EnemyArtilleryComponent
extends Node

# Stationary siege piece: drifts slowly toward the fleet (deliberately no
# pursuit component - closing distance is incidental, not its purpose) and
# fires a slow, clearly visible AOE shell on a long cooldown via a
# standalone ArtilleryShell, so an already-launched shot survives this
# enemy dying mid-flight, same as EnemyProjectile/Projectile already do.

var capability_id: String = "artillery"

@export var fire_cooldown: float = 6.0
@export var fire_range: float = 900.0
@export var shell_speed: float = 180.0
@export var aoe_radius: float = 220.0
@export var damage: int = 3
@export var drift_speed: float = 20.0
@export var color: Color = Color(1.0, 0.5, 0.2)

var cooldown_left: float = 0.0
var shell_scene: PackedScene = preload("res://enemies/ArtilleryShell.tscn")


func tick(delta: float) -> void:
	var enemy: Node2D = get_parent()
	_drift(enemy, delta)

	cooldown_left -= delta
	if cooldown_left > 0.0:
		return

	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
	if fleet == null or fleet.ships.is_empty():
		return
	var centroid: Vector2 = fleet.get_centroid()
	if enemy.global_position.distance_to(centroid) > fire_range:
		return

	var shell: Node2D = shell_scene.instantiate()
	shell.shell_speed = shell_speed
	shell.aoe_radius = aoe_radius
	shell.damage = damage
	shell.color = color
	enemy.get_tree().root.add_child(shell)
	shell.launch(enemy.global_position, centroid)
	cooldown_left = fire_cooldown


func _drift(enemy: Node2D, delta: float) -> void:
	# Local position throughout, same convention as EnemyPursuitComponent/
	# EnemyStandoffComponent: valid as long as the enemy's container and
	# Fleet share a common origin, which every scene in this project does.
	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
	if fleet == null or fleet.ships.is_empty():
		return
	var to_fleet: Vector2 = fleet.get_centroid() - enemy.position
	# #69: gated by the same fire_range it already shells within, rather
	# than a second tunable that could drift out of sync - outside its own
	# firing envelope it has nothing to be drifting toward yet.
	if to_fleet.length() > fire_range:
		return
	if to_fleet.length() < 1.0:
		return
	enemy.position += to_fleet.normalized() * drift_speed * delta