extends Node3D
## Cheap Compatibility-safe Xen arrival: rotating rings, CPU wisps, cyan flash.
signal materialized
const Audio = preload("res://scripts/hl_audio.gd")
const ARRIVAL_TIME := 1.5
var elapsed := 0.0
var announced := false
var rings: Array[MeshInstance3D] = []
var light: OmniLight3D

func _ready() -> void:
	name = "BossTeleport"
	Audio.play(self, "ambience/port_suckin1.wav", true, -9)
	var material := StandardMaterial3D.new()
	material.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	material.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	material.blend_mode = BaseMaterial3D.BLEND_MODE_ADD
	material.albedo_color = Color(0.12, 1.0, 0.65, 0.8)
	for i in range(3):
		var ring := MeshInstance3D.new()
		ring.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
		var mesh := TorusMesh.new()
		mesh.inner_radius = 0.91
		mesh.outer_radius = 1.0
		mesh.rings = 32
		mesh.ring_segments = 8
		mesh.material = material
		ring.mesh = mesh
		ring.position.y = 0.10 + i * 0.72
		add_child(ring)
		rings.append(ring)
	light = OmniLight3D.new()
	light.light_color = Color(0.12, 1.0, 0.65)
	light.light_energy = 3
	light.omni_range = 6
	light.shadow_enabled = false
	light.position.y = 1.1
	add_child(light)
	var particles := CPUParticles3D.new()
	particles.amount = 40
	particles.lifetime = 1.0
	particles.emitting = true
	particles.emission_shape = CPUParticles3D.EMISSION_SHAPE_SPHERE
	particles.emission_sphere_radius = 0.9
	particles.position.y = 0.5
	particles.direction = Vector3.UP
	particles.spread = 20
	particles.initial_velocity_min = 1
	particles.initial_velocity_max = 2.2
	particles.gravity = Vector3.ZERO
	var quad := QuadMesh.new()
	quad.size = Vector2(0.22, 0.4)
	var mist := material.duplicate() as StandardMaterial3D
	mist.billboard_mode = BaseMaterial3D.BILLBOARD_ENABLED
	mist.albedo_texture = preload("res://assets/effects/flame.png")
	quad.material = mist
	particles.mesh = quad
	var colors := Gradient.new()
	colors.set_color(0, Color(0.1, 1, 0.65, 0.8))
	colors.set_color(1, Color(0.05, 0.3, 0.25, 0))
	particles.color_ramp = colors
	add_child(particles)
	get_tree().create_timer(ARRIVAL_TIME).timeout.connect(func():
		particles.emitting = false)

func _process(dt: float) -> void:
	elapsed += dt
	for i in rings.size():
		var size := maxf(0.05, sin(minf(elapsed / 2.2, 1.0) * PI))
		rings[i].scale = Vector3.ONE * size * (1.0 + 0.12 * sin(elapsed * 11 + i))
		rings[i].rotation = Vector3(sin(elapsed * 4 + i) * 0.2, elapsed * 3, 0)
	light.light_energy = 3 * maxf(0, 1.0 - maxf(0, elapsed - ARRIVAL_TIME) / 0.7)
	if elapsed >= ARRIVAL_TIME and not announced:
		announced = true
		Audio.play(self, "ambience/port_suckout1.wav", true, -9)
		materialized.emit()
	if elapsed >= 2.2:
		# Sound players belong to this node; leave them time to finish.
		for ring in rings:
			ring.hide()
		light.hide()
		set_process(false)
		get_tree().create_timer(3).timeout.connect(queue_free)