extends Node3D
# Оформление хаба: пол с кольцами, колонны, потолочные светильники, окна с ночным городом, лавки,
# платформа с вращающейся голограммой в центре, пылинки в воздухе. Размеры берутся из hub.gd.
# Всё строится кодом и без тяжёлых ресурсов — хаб лежит в основном пакете игры.

const BRASS := Color(0.85, 0.58, 0.26)
const CYAN := Color(0.25, 0.85, 1.0)
const DARK := Color(0.045, 0.05, 0.065)

const FLOOR_SHADER := """
shader_type spatial;
varying vec3 wpos;
void vertex() { wpos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz; }
void fragment() {
	vec2 cell = wpos.xz / 2.0;
	vec2 g = abs(fract(cell - 0.5) - 0.5) / fwidth(cell);
	float line = 1.0 - min(min(g.x, g.y), 1.0);
	float r = length(wpos.xz);
	float ring = 1.0 - smoothstep(0.0, 0.09, min(abs(r - 7.5), abs(r - 12.5)));
	// дорожка света от платформы к порталам
	float lane = 1.0 - smoothstep(0.0, 0.07, abs(wpos.x)) ;
	lane *= step(wpos.z, -4.0) * 0.8;
	vec3 base = vec3(0.028, 0.032, 0.045);
	vec3 col = mix(base, vec3(0.08, 0.5, 0.65), line * 0.55);
	col = mix(col, vec3(0.9, 0.58, 0.24), clamp(ring + lane, 0.0, 1.0));
	ALBEDO = col * 0.55;
	EMISSION = vec3(0.03, 0.25, 0.34) * line + vec3(0.5, 0.3, 0.1) * clamp(ring + lane, 0.0, 1.0);
	ROUGHNESS = 0.35;
	METALLIC = 0.4;
}
"""

# Окно: ночной город — небо с зарёй у горизонта, силуэты домов со светящимися окнами
const CITY_SHADER := """
shader_type spatial;
render_mode unshaded;
float h(vec2 p) { return fract(sin(dot(p, vec2(127.1, 311.7))) * 43758.5453); }
void fragment() {
	float yb = 1.0 - UV.y;
	vec3 col = mix(vec3(0.015, 0.02, 0.06), vec3(0.42, 0.14, 0.30), pow(yb, 2.2) * 0.9);
	col += vec3(0.5, 0.25, 0.1) * smoothstep(0.35, 0.0, yb) * 0.6;
	for (int layer = 0; layer < 2; layer++) {
		float n = layer == 0 ? 14.0 : 24.0;
		float id = floor(UV.x * n + float(layer) * 7.0);
		float top = (layer == 0 ? 0.42 : 0.26) * (0.35 + 0.65 * h(vec2(id, float(layer) + 1.0)));
		if (yb < top) {
			vec3 body = layer == 0 ? vec3(0.02, 0.02, 0.035) : vec3(0.05, 0.03, 0.07);
			vec2 wc = vec2(UV.x * n * 3.0, yb * (layer == 0 ? 34.0 : 22.0));
			vec2 wi = floor(wc);
			vec2 wf = fract(wc);
			float lit = step(0.62, h(wi + id)) * step(0.2, wf.x) * step(wf.x, 0.8) * step(0.25, wf.y) * step(wf.y, 0.75);
			vec3 wcol = h(wi + 3.0) > 0.55 ? vec3(1.0, 0.7, 0.3) : vec3(0.4, 0.8, 1.0);
			col = body + wcol * lit * (layer == 0 ? 0.9 : 0.5);
			break;
		}
	}
	ALBEDO = col;
}
"""

var _spin: Array = []          # [узел, ось, скорость]
var _pulse_mat: StandardMaterial3D
var _t := 0.0

func build(width: float, depth: float, height: float) -> void:
	_build_pillars(width, depth, height)
	_build_ceiling(width, depth, height)
	_build_windows(width, depth, height)
	_build_benches(width, depth)
	_build_dais()
	_build_signs(width, depth, height)
	_build_dust(width, depth, height)

func floor_material() -> ShaderMaterial:
	var m := ShaderMaterial.new()
	m.shader = Shader.new()
	m.shader.code = FLOOR_SHADER
	return m

func _process(delta: float) -> void:
	_t += delta
	for s in _spin:
		(s[0] as Node3D).rotate(s[1], s[2] * delta)
	if _pulse_mat:
		_pulse_mat.emission_energy_multiplier = 1.6 + 0.5 * sin(_t * 1.6)

# ---------- вспомогательное ----------

func _emissive(c: Color, energy := 2.0) -> StandardMaterial3D:
	var m := StandardMaterial3D.new()
	m.albedo_color = c.darkened(0.6)
	m.emission_enabled = true
	m.emission = c
	m.emission_energy_multiplier = energy
	return m

func _matte(c: Color, metallic := 0.0, rough := 0.7) -> StandardMaterial3D:
	var m := StandardMaterial3D.new()
	m.albedo_color = c
	m.metallic = metallic
	m.roughness = rough
	return m

func _box(size: Vector3, pos: Vector3, mat: Material, collide := false) -> MeshInstance3D:
	var mesh := BoxMesh.new()
	mesh.size = size
	mesh.material = mat
	var mi := MeshInstance3D.new()
	mi.mesh = mesh
	mi.position = pos
	mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	add_child(mi)
	if collide:
		var body := StaticBody3D.new()
		var cs := CollisionShape3D.new()
		var shape := BoxShape3D.new()
		shape.size = size
		cs.shape = shape
		body.add_child(cs)
		mi.add_child(body)
	return mi

func _label(text: String, size: float, color: Color, pos: Vector3, yaw := 0.0) -> Label3D:
	var l := Label3D.new()
	l.text = text
	l.font_size = 64
	l.pixel_size = size
	l.outline_size = 10
	l.modulate = color
	l.shaded = false
	l.position = pos
	l.rotation.y = yaw
	add_child(l)
	return l

# ---------- колонны ----------

func _build_pillars(width: float, depth: float, height: float) -> void:
	var steel := _matte(Color(0.07, 0.075, 0.09), 0.6, 0.4)
	var glow := _emissive(CYAN, 2.2)
	var brass := _emissive(BRASS, 1.4)
	var px := width * 0.5 - 8.0
	for sx in [-1.0, 1.0]:
		for z in [-6.0, 2.0, 10.0]:
			var p := Vector3(sx * px, 0.0, z)
			_box(Vector3(1.1, height, 1.1), p + Vector3(0, height * 0.5, 0), steel, true)
			_box(Vector3(1.2, 0.18, 1.2), p + Vector3(0, 0.09, 0), brass)
			_box(Vector3(1.2, 0.18, 1.2), p + Vector3(0, height - 0.09, 0), brass)
			# светящаяся прорезь на каждой грани по высоте
			_box(Vector3(0.12, height - 1.6, 1.14), p + Vector3(0, height * 0.5, 0), glow)
			_box(Vector3(1.14, height - 1.6, 0.12), p + Vector3(0, height * 0.5, 0), glow)

# ---------- потолок ----------

func _build_ceiling(width: float, depth: float, height: float) -> void:
	var strip := _emissive(Color(1.0, 0.86, 0.62), 2.4)
	var y := height - 0.08
	for x in [-18.0, -9.0, 0.0, 9.0, 18.0]:
		_box(Vector3(0.35, 0.12, depth - 4.0), Vector3(x, y, 0), strip)
	for z in [-8.0, 0.0, 8.0]:
		_box(Vector3(width - 4.0, 0.1, 0.22), Vector3(0, y + 0.02, z), _emissive(BRASS, 1.2))
	# большое кольцо над платформой
	var ring := TorusMesh.new()
	ring.inner_radius = 3.9
	ring.outer_radius = 4.1
	ring.material = _emissive(CYAN, 2.0)
	var mi := MeshInstance3D.new()
	mi.mesh = ring
	mi.position = Vector3(0, height - 0.5, 0)
	mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	add_child(mi)
	# мягкий свет зон: тёплый у порталов, холодный в центре
	for x in [-14.0, 14.0]:
		var l := OmniLight3D.new()
		l.position = Vector3(x, height - 1.0, 4.0)
		l.omni_range = 20.0
		l.light_energy = 0.7
		l.light_color = Color(1.0, 0.82, 0.6)
		l.shadow_enabled = false
		add_child(l)

# ---------- окна в боковых стенах ----------

func _build_windows(width: float, depth: float, height: float) -> void:
	var city := ShaderMaterial.new()
	city.shader = Shader.new()
	city.shader.code = CITY_SHADER
	var frame := _matte(Color(0.05, 0.05, 0.06), 0.7, 0.35)
	var brass := _emissive(BRASS, 0.9)
	var hw := width * 0.5
	var win := Vector2(8.5, 5.6)
	var y := 4.6
	for side in [-1, 1]:
		var yaw := PI * 0.5 * float(-side)       # лицом в комнату
		var x := float(side) * (hw - 0.04)
		for z in [-8.5, 0.5, 9.5]:
			var q := QuadMesh.new()
			q.size = win
			q.material = city
			var mi := MeshInstance3D.new()
			mi.mesh = q
			mi.position = Vector3(x, y, z)
			mi.rotation.y = yaw
			mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
			add_child(mi)
			# рама и переплёты
			var inner_x := float(side) * (hw - 0.12)
			_box(Vector3(0.1, win.y, 0.18), Vector3(inner_x, y, z - win.x * 0.25), frame)
			_box(Vector3(0.1, win.y, 0.18), Vector3(inner_x, y, z + win.x * 0.25), frame)
			_box(Vector3(0.1, 0.18, win.x), Vector3(inner_x, y - 0.5, z), frame)
			for e in [-1.0, 1.0]:
				_box(Vector3(0.12, win.y + 0.5, 0.2), Vector3(inner_x, y, z + e * (win.x * 0.5 + 0.1)), frame)
			var wl := OmniLight3D.new()    # отсвет города на полу и лавках
			wl.position = Vector3(float(side) * (hw - 3.0), y - 1.0, z)
			wl.light_color = Color(0.75, 0.45, 0.9)
			wl.light_energy = 1.1
			wl.omni_range = 11.0
			wl.shadow_enabled = false
			add_child(wl)
			_box(Vector3(0.12, 0.08, win.x + 0.5), Vector3(inner_x, y - win.y * 0.5 - 0.3, z), brass)
			_box(Vector3(0.12, 0.08, win.x + 0.5), Vector3(inner_x, y + win.y * 0.5 + 0.3, z), brass)

# ---------- лавки ----------

func _build_benches(width: float, _depth: float) -> void:
	var seat := _matte(Color(0.16, 0.08, 0.06), 0.0, 0.55)
	var metal := _matte(Color(0.08, 0.08, 0.1), 0.8, 0.3)
	var x := width * 0.5 - 2.0
	for side in [-1.0, 1.0]:
		for z in [-8.5, 0.5, 9.5]:
			var base := Vector3(side * x, 0.0, z)
			_box(Vector3(1.0, 0.45, 5.0), base + Vector3(0, 0.225, 0), seat, true)
			_box(Vector3(0.25, 0.9, 5.0), base + Vector3(side * 0.5, 0.7, 0), seat)
			_box(Vector3(0.95, 0.08, 4.8), base + Vector3(0, 0.02, 0), metal)
			_box(Vector3(0.05, 0.04, 4.8), base + Vector3(-side * 0.5, 0.3, 0), _emissive(BRASS, 1.0))

# ---------- центр: платформа и голограмма ----------

func _build_dais() -> void:
	var body := StaticBody3D.new()
	add_child(body)
	var cyl := CylinderMesh.new()
	cyl.top_radius = 3.6
	cyl.bottom_radius = 3.7
	cyl.height = 0.32
	cyl.material = _matte(Color(0.06, 0.065, 0.08), 0.7, 0.3)
	var mi := MeshInstance3D.new()
	mi.mesh = cyl
	mi.position.y = 0.16
	mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	body.add_child(mi)
	var cs := CollisionShape3D.new()
	var shape := CylinderShape3D.new()
	shape.radius = 3.65
	shape.height = 0.32
	cs.shape = shape
	cs.position.y = 0.16
	body.add_child(cs)
	var rim := TorusMesh.new()
	rim.inner_radius = 3.45
	rim.outer_radius = 3.6
	rim.material = _emissive(BRASS, 1.8)
	var rim_mi := MeshInstance3D.new()
	rim_mi.mesh = rim
	rim_mi.position.y = 0.33
	rim_mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	add_child(rim_mi)

	_pulse_mat = _emissive(CYAN, 2.0)
	var holo := Node3D.new()
	holo.position = Vector3(0, 2.6, 0)
	add_child(holo)
	var core := SphereMesh.new()
	core.radius = 0.5
	core.height = 1.0
	core.material = _pulse_mat
	var core_mi := MeshInstance3D.new()
	core_mi.mesh = core
	core_mi.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	holo.add_child(core_mi)
	var specs := [[1.1, CYAN, Vector3(1, 0, 0), 0.7], [1.5, BRASS, Vector3(0, 0, 1), -0.5], [1.9, CYAN, Vector3(0, 1, 0), 0.35]]
	for i in specs.size():
		var t := TorusMesh.new()
		t.inner_radius = specs[i][0] - 0.035
		t.outer_radius = specs[i][0] + 0.035
		t.rings = 48
		t.material = _emissive(specs[i][1], 2.2)
		var pivot := Node3D.new()
		holo.add_child(pivot)
		pivot.rotation = Vector3(0.4 * i, 0.9 * i, 0.0)
		var tm := MeshInstance3D.new()
		tm.mesh = t
		tm.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
		pivot.add_child(tm)
		_spin.append([pivot, specs[i][2], specs[i][3]])
	var light := OmniLight3D.new()
	light.position = Vector3(0, 2.6, 0)
	light.light_color = CYAN
	light.light_energy = 1.4
	light.omni_range = 11.0
	light.shadow_enabled = false
	add_child(light)
	var l := Label3D.new()
	l.text = "AMAN'S WORLD"
	l.billboard = BaseMaterial3D.BILLBOARD_ENABLED
	l.font_size = 64
	l.pixel_size = 0.009
	l.outline_size = 12
	l.modulate = Color(1.0, 0.9, 0.7)
	l.shaded = false
	l.position = Vector3(0, 4.9, 0)
	add_child(l)

# ---------- вывески ----------

func _build_signs(width: float, depth: float, height: float) -> void:
	var hd := depth * 0.5
	# южная стена: «лифтовая» панель этажа
	_box(Vector3(10.0, 2.2, 0.15), Vector3(0, 5.0, hd - 0.08), _matte(Color(0.03, 0.03, 0.04), 0.5, 0.4))
	_box(Vector3(10.3, 0.08, 0.2), Vector3(0, 6.15, hd - 0.1), _emissive(BRASS, 1.2))
	_box(Vector3(10.3, 0.08, 0.2), Vector3(0, 3.85, hd - 0.1), _emissive(BRASS, 1.2))
	_label("ЛОББИ", 0.02, Color(1.0, 0.82, 0.5), Vector3(0, 5.4, hd - 0.2), PI)
	_label("ЭТАЖ  0   ·   ВСЕ КАРТЫ ВНИЗУ ПО КОРИДОРУ", 0.008, Color(0.7, 0.9, 1.0), Vector3(0, 4.4, hd - 0.2), PI)
	# северная стена: фриз над порталами
	_box(Vector3(width - 6.0, 0.12, 0.3), Vector3(0, 8.9, -hd + 0.15), _emissive(BRASS, 1.3))
	_box(Vector3(width - 6.0, 0.12, 0.3), Vector3(0, 8.0, -hd + 0.15), _emissive(BRASS, 1.3))

# ---------- пыль в лучах света ----------

func _build_dust(width: float, depth: float, height: float) -> void:
	var p := GPUParticles3D.new()
	p.amount = 140
	p.lifetime = 14.0
	p.preprocess = 14.0
	p.visibility_aabb = AABB(Vector3(-width * 0.5, 0, -depth * 0.5), Vector3(width, height, depth))
	var pm := ParticleProcessMaterial.new()
	pm.emission_shape = ParticleProcessMaterial.EMISSION_SHAPE_BOX
	pm.emission_box_extents = Vector3(width * 0.5 - 1.0, height * 0.5 - 0.5, depth * 0.5 - 1.0)
	pm.gravity = Vector3.ZERO
	pm.direction = Vector3(0.2, 1.0, 0.1)
	pm.spread = 180.0
	pm.initial_velocity_min = 0.05
	pm.initial_velocity_max = 0.25
	p.process_material = pm
	var q := QuadMesh.new()
	q.size = Vector2(0.05, 0.05)
	var m := StandardMaterial3D.new()
	m.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
	m.billboard_mode = BaseMaterial3D.BILLBOARD_ENABLED
	m.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
	m.albedo_color = Color(1.0, 0.9, 0.7, 0.35)
	q.material = m
	p.draw_pass_1 = q
	p.position = Vector3(0, height * 0.5, 0)
	p.cast_shadow = GeometryInstance3D.SHADOW_CASTING_SETTING_OFF
	add_child(p)