extends Area2D

signal destroyed

const VESSEL_DEFINITIONS = preload("res://VesselDefinitions.gd")

@export var max_speed: float = 460.0
@export var acceleration: float = 450.0
@export var rotation_speed: float = 8.0
@export var arrive_radius: float = 6.0
@export var vessel_type: String = "interceptor"

var definition: Resource
var glow_color: Color = Color(0.25, 0.85, 1.0)
var core_color: Color = Color.WHITE
var velocity: Vector2 = Vector2.ZERO
var fleet_velocity: Vector2 = Vector2.ZERO
var move_target: Vector2

# Compatibility accessors keep old saves/tests readable while shield state
# itself belongs exclusively to the optional ShieldComponent.
var shield_charges: int:
	get:
		var component: Node = get_component("shield")
		return component.charges if component != null else 0
	set(value):
		var component: Node = get_component("shield")
		if component != null:
			component.set_charges(value)

var shield_recharge_left: float:
	get:
		var component: Node = get_component("shield")
		return component.recharge_left if component != null else 0.0
	set(value):
		var component: Node = get_component("shield")
		if component != null:
			component.recharge_left = value

var projectile_damage: int:
	get:
		var component: Node = get_component("weapon")
		return component.projectile_damage if component != null else 0


func _ready() -> void:
	move_target = position
	add_to_group("player_ships")
	area_entered.connect(_on_area_entered)
	definition = VESSEL_DEFINITIONS.get_definition(vessel_type)
	if definition == null:
		return
	glow_color = definition.glow_color
	for component_scene in definition.component_scenes:
		var component: Node = component_scene.instantiate()
		add_child(component)
		if component.has_method("setup"):
			component.setup()
	apply_vessel_stats()
	queue_redraw()


func get_component(capability: String) -> Node:
	for child in get_children():
		if child.get("capability_id") == capability:
			return child
	return null


func has_capability(capability: String) -> bool:
	return get_component(capability) != null


func set_move_target(world_pos: Vector2) -> void:
	move_target = world_pos


func apply_vessel_stats() -> void:
	if definition == null:
		definition = VESSEL_DEFINITIONS.get_definition(vessel_type)
	if definition == null:
		return
	max_speed = GameState.vessel_stat(vessel_type, "max_speed")
	acceleration = GameState.vessel_stat(vessel_type, "acceleration")
	for child in get_children():
		if child.has_method("apply_stats"):
			child.apply_stats()


func has_shield() -> bool:
	var component: Node = get_component("shield")
	return component != null and component.is_active()


func _physics_process(delta: float) -> void:
	for child in get_children():
		if child.has_method("tick"):
			child.tick(delta)

	var to_target: Vector2 = move_target - position
	var distance: float = to_target.length()
	if distance <= arrive_radius:
		position = move_target
		velocity = Vector2.ZERO
	else:
		var braking_speed: float = sqrt(2.0 * acceleration * distance)
		var desired_speed: float = min(max_speed, braking_speed)
		var desired_velocity: Vector2 = to_target.normalized() * desired_speed
		velocity = velocity.move_toward(desired_velocity, acceleration * delta)
		position += velocity * delta

	var motion: Vector2 = velocity + fleet_velocity
	if motion.length() > 8.0:
		var target_angle: float = motion.angle() + PI / 2.0
		rotation = lerp_angle(rotation, target_angle, rotation_speed * delta)


func take_damage(_amount: int) -> bool:
	# Ships have no hit points - any unabsorbed hit is lethal. A shield
	# charge absorbs a hit entirely regardless of its amount, matching
	# VesselShieldComponent's existing all-or-nothing semantics; `_amount`
	# is accepted (not `int`-clamped away) so callers like EnemyProjectile
	# have a normal damage parameter to pass even though it isn't graded here.
	for child in get_children():
		if child.has_method("absorb_hit") and child.absorb_hit():
			return true
	ShipExplosionVFX.spawn(get_tree().root, position)
	destroyed.emit()
	queue_free()
	return false


func _on_area_entered(area: Area2D) -> void:
	if not (area.is_in_group("enemies") or area.is_in_group("asteroids")):
		return
	var absorbed: bool = take_damage(1)
	if absorbed and area.is_in_group("asteroids") and is_instance_valid(area):
		area.queue_free()


func _draw() -> void:
	var points: PackedVector2Array = definition.hull_points if definition != null else PackedVector2Array([
		Vector2(0, -22), Vector2(-14, 16), Vector2(14, 16),
	])
	NeonDraw.draw_glowing_polygon(self, points, glow_color, 1.0, core_color)