class_name BossMinion
extends Area2D

signal destroyed

const COMBAT_TARGET = preload("res://core/CombatTarget.gd")

@export var marked: bool = false
@export var max_hp: int = 2
@export var speed: float = 245.0
@export var acceleration: float = 520.0

var boss: Node2D
var hp: int = 2
var velocity: Vector2 = Vector2.ZERO
var phase: float = 0.0
var dead: bool = false


func _ready() -> void:
	hp = max_hp
	add_to_group("enemies")
	add_to_group("boss_minions")
	COMBAT_TARGET.register(self, COMBAT_TARGET.DANGER_PRIORITY)
	phase = randf() * TAU
	queue_redraw()


func _physics_process(delta: float) -> void:
	phase += delta
	var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
	if fleet != null and not fleet.ships.is_empty():
		var to_fleet: Vector2 = fleet.get_centroid() - global_position
		if to_fleet.length() > 1.0:
			velocity = velocity.move_toward(to_fleet.normalized() * speed,
				acceleration * delta)
			global_position += velocity * delta
			if velocity.length() > 4.0:
				rotation = lerp_angle(rotation, velocity.angle() + PI / 2.0,
					7.0 * delta)
	queue_redraw()


func take_damage(amount: int) -> bool:
	if dead:
		return false
	hp -= maxi(amount, 1)
	if hp > 0:
		return false
	_die(true)
	return true


func collide_with_player_vessel() -> void:
	_die(false)


func retire() -> void:
	if dead:
		return
	dead = true
	hp = 0
	destroyed.emit()
	queue_free()


func _die(killed_by_player: bool) -> void:
	if dead:
		return
	dead = true
	hp = 0
	if killed_by_player and marked and is_instance_valid(boss):
		boss.accept_marked_kill(global_position)
	EnemyExplosionVFX.spawn(get_tree().root, global_position)
	Sfx.play(get_tree(), Sfx.ENEMY_DEATH)
	destroyed.emit()
	queue_free()


func _draw() -> void:
	var glow := Color(1.0, 0.78, 0.18) if marked else Color(0.9, 0.16, 0.58)
	var core := Color(0.13, 0.01, 0.09)
	# A small bulb with four streaming arms: recognisably related to the boss,
	# but compact enough to read among an entire wave.
	draw_set_transform(Vector2.ZERO, 0.0, Vector2(1.0, 0.76))
	NeonDraw.draw_glowing_circle(self, Vector2(0, -7), 13.0, glow, 1.0, core)
	draw_set_transform(Vector2.ZERO, 0.0, Vector2.ONE)
	for i in range(4):
		var x: float = -12.0 + float(i) * 8.0
		var curl: float = sin(phase * 5.0 + float(i)) * 5.0
		NeonDraw.draw_glowing_path(self, PackedVector2Array([
			Vector2(x, 1), Vector2(x + curl * 0.35, 10), Vector2(x + curl, 21),
		]), glow, 0.85, 0.35, core)
	if marked:
		NeonDraw.draw_glowing_circle(self, Vector2(0, -8), 4.0,
			Color.WHITE, 1.0, core)