class_name EnemyFortress
extends EnemyBase
## 地面固定堡垒：随地面同速下滚，炮塔持续追踪玩家并瞄准射击。

const TEX := preload("res://assets/svg/fortress.svg")
const TURRET_TEX := preload("res://assets/svg/fortress_turret.svg")
const SCROLL_SPEED := 120.0
const MUZZLE_LEN := 26.0

var difficulty := 1.0
var fire_interval := 2.6
var bullet_speed := 220.0

var _turret: Sprite2D
var _fire_timer := 0.0


func setup(p_x: float, p_y: float, p_difficulty := 1.0) -> void:
	position = Vector2(p_x, p_y)
	difficulty = p_difficulty
	fire_interval = maxf(1.5, 2.6 / p_difficulty)
	bullet_speed = 220.0 * p_difficulty


func _ready() -> void:
	# 层 32：地面单位——玩家子弹可命中，但玩家机体不与其碰撞（飞越上空）
	collision_layer = 32
	collision_mask = 0
	hp = 4
	score_value = 300
	hit_radius = 26.0
	var base := Sprite2D.new()
	base.texture = TEX
	add_child(base)
	_turret = Sprite2D.new()
	_turret.texture = TURRET_TEX
	add_child(_turret)
	var shape := CollisionShape2D.new()
	var circle := CircleShape2D.new()
	circle.radius = 24.0
	shape.shape = circle
	add_child(shape)
	_fire_timer = randf_range(0.8, 1.8)


func _process(delta: float) -> void:
	position.y += SCROLL_SPEED * delta
	if position.y > 1020.0:
		queue_free()
		return
	var dir := _aim_direction()
	# 炮塔美术默认朝下(+Y)：rotate 对齐瞄准方向
	_turret.rotation = dir.angle() - PI / 2.0
	if position.y > 60.0 and position.y < 720.0:
		_fire_timer -= delta
		if _fire_timer <= 0.0:
			_fire_timer = fire_interval
			_fire_bullet(dir * bullet_speed, dir * MUZZLE_LEN)