extends Node3D
## Weltaufbau, Spielstand, Crew-Aktionen und Netzwerk.
## Der Host ist massgeblich: er simuliert Zug, Fahrgäste und Kasse.
## Clients schicken Wuensche und bekommen Zustaende zurueck.

const Mat = preload("res://scripts/mat.gd")
const Deco = preload("res://scripts/deco.gd")
const Cargo = preload("res://scripts/cargo.gd")
const Defs = preload("res://scripts/car_defs.gd")
const TrackScript = preload("res://scripts/track.gd")
const WorldScript = preload("res://scripts/world.gd")
const StationScript = preload("res://scripts/station.gd")
const TrainScript = preload("res://scripts/train.gd")
const PlayerScript = preload("res://scripts/player.gd")
const PassengerScript = preload("res://scripts/passenger.gd")
const AvatarScript = preload("res://scripts/avatar.gd")
const CameraRig = preload("res://scripts/camera_rig.gd")
const AudioScript = preload("res://scripts/audio.gd")
const HudScript = preload("res://scripts/hud.gd")
const ShopScript = preload("res://scripts/shop.gd")
const MenuScript = preload("res://scripts/menu.gd")

enum Mode { MENU, SOLO, HOST, CLIENT }

## Zwei Weichenpunkte, drei Abschnitte: Talstrecke und Bergstrecke fuehren
## beide von J1 nach J2, die Heimstrecke zurueck.
const J1 := Vector2(-139, -77)
const J2 := Vector2(144, 14)
const T1 := Vector2(101, -87)     ## Fahrtrichtung an J1
const T2 := Vector2(-9, 125)      ## Fahrtrichtung an J2
const SEG_TAL := [J1, Vector2(-53, -101), Vector2(38, -86), Vector2(110, -48), J2]
const SEG_BERG := [J1, Vector2(-85, -38), Vector2(-20, -14), Vector2(58, -12), Vector2(112, -24), J2]
const SEG_HEIM := [J2, Vector2(101, 77), Vector2(14, 96), Vector2(-62, 77), Vector2(-101, 34), Vector2(-154, -14), J1]

## name, abschnitt, anteil, produziert, akzeptiert, seite, wand, dach, schornstein
const STATION_DEFS := [
	["Waldkirch", 0, 0.10, Cargo.Type.WOOD, [Cargo.Type.GRAIN], 1.0, "c9a06a", "8a4b2f", false],
	["Kohlberg", 0, 0.55, Cargo.Type.COAL, [], -1.0, "6f6a63", "40393a", true],
	["Eisenwerk", 0, 0.88, -1, [Cargo.Type.COAL, Cargo.Type.WOOD], 1.0, "9aa0a6", "55606b", true],
	["Grüntal", 2, 0.33, Cargo.Type.GRAIN, [], -1.0, "e8ddc4", "b4562f", false],
	["Ahornstadt", 2, 0.67, -1, [Cargo.Type.GRAIN, Cargo.Type.WOOD], 1.0, "f0e6d2", "a83b30", true],
	["Bergblick", 1, 0.50, -1, [], -1.0, "e6dcc2", "5c7a4e", false],
]

const WORLD_SEED := 20260828
const SPAWN_INTERVAL := 3.5
const BOARD_INTERVAL := 0.45
const LOAD_INTERVAL := 0.35
const DRINK_TIP := 14
const START_MONEY := 1500
const POSE_HZ := 20.0
const SAVE_PATH := "user://save.json"
const AUTOSAVE_SEC := 20.0

## Meilensteine. "kind" sagt, welcher Zähler zählt.
const GOALS := [
	{"id": "tickets10", "text": "10 Tickets kontrollieren", "kind": "tickets", "value": 10, "reward": 250},
	{"id": "cargo30", "text": "30 Einheiten Fracht liefern", "kind": "cargo", "value": 30, "reward": 400},
	{"id": "dining", "text": "Einen Speisewagen anhängen", "kind": "dining", "value": 1, "reward": 300},
	{"id": "berg", "text": "Bergblick anfahren", "kind": "visit", "value": 1, "reward": 500},
	{"id": "rep15", "text": "Ansehen 15 erreichen", "kind": "rep", "value": 15, "reward": 800},
	{"id": "tickets60", "text": "60 Tickets kontrollieren", "kind": "tickets", "value": 60, "reward": 900},
	{"id": "rep40", "text": "Ansehen 40 erreichen", "kind": "rep", "value": 40, "reward": 1500},
	{"id": "final", "text": "Elektro-Express mit 5 Wagen und Ansehen 60", "kind": "final", "value": 60, "reward": 5000},
]
const STATE_HZ := 4.0

var mode := Mode.MENU
var started := false
var my_id := 1
var driver_id := 0
var money := START_MONEY
var reputation := 0
var upgrades: Dictionary = {}
var delivered_units := 0
var tickets_checked := 0
var visited: Dictionary = {}          ## Bahnhofsname -> true
var goals_done: Dictionary = {}       ## Ziel-ID -> true
var won := false
var my_name := "Crew"
var _autosave := AUTOSAVE_SEC
var _load_on_begin := false

var track: Node3D
var world: Node3D
var train: Node3D
var player: Node3D
var hud: CanvasLayer
var shop: CanvasLayer
var menu: CanvasLayer
var cam_rig: Node3D
var audio: Node
var stations: Array = []
var passengers: Array = []
var players: Dictionary = {}      ## peer_id -> { "s", "x", "yaw", "carrying", "avatar" }

var _rng := RandomNumberGenerator.new()
var _spawn_timer := 0.0
var _board_timer := 0.0
var _load_timer := 0.0
var _pose_timer := 0.0
var _state_timer := 0.0
var _next_pid := 1
var _by_pid: Dictionary = {}
var _exterior := false
var _last_dock: Node = null
var _last_speed := 0.0

func _ready() -> void:
	menu = MenuScript.new()
	add_child(menu)
	menu.solo_chosen.connect(_start_solo)
	menu.continue_chosen.connect(_start_continue)
	menu.host_chosen.connect(_start_host)
	menu.join_chosen.connect(_start_join)
	multiplayer.peer_connected.connect(_on_peer_connected)
	multiplayer.peer_disconnected.connect(_on_peer_disconnected)
	multiplayer.connected_to_server.connect(_on_connected)
	multiplayer.connection_failed.connect(_on_connect_failed)
	multiplayer.server_disconnected.connect(_on_server_gone)

func is_server() -> bool:
	return mode == Mode.SOLO or mode == Mode.HOST

func networked() -> bool:
	return mode == Mode.HOST or mode == Mode.CLIENT

# --- Start ----------------------------------------------------------------

func _start_solo() -> void:
	mode = Mode.SOLO
	my_id = 1
	_begin()

func _start_continue() -> void:
	_load_on_begin = true
	_start_solo()

func _start_host(port: int) -> void:
	var peer := ENetMultiplayerPeer.new()
	var err := peer.create_server(port, 8)
	if err != OK:
		menu.set_status("Port %d belegt (Fehler %d)." % [port, err])
		return
	multiplayer.multiplayer_peer = peer
	mode = Mode.HOST
	my_id = 1
	_begin()
	hud.toast("Sitzung läuft auf Port %d" % port, Color("8fd8ff"))

func _start_join(address: String, port: int) -> void:
	var peer := ENetMultiplayerPeer.new()
	var err := peer.create_client(address, port)
	if err != OK:
		menu.set_status("Verbindung nicht möglich (Fehler %d)." % err)
		return
	multiplayer.multiplayer_peer = peer
	mode = Mode.CLIENT
	menu.set_status("Verbinde mit %s:%d ..." % [address, port])

func _on_connected() -> void:
	my_id = multiplayer.get_unique_id()
	_begin()

func _on_connect_failed() -> void:
	mode = Mode.MENU
	multiplayer.multiplayer_peer = null
	menu.set_status("Host nicht erreichbar.")

func _on_server_gone() -> void:
	if hud:
		hud.toast("Verbindung zum Host verloren.", Color("ff9a8a"))

func _begin() -> void:
	my_name = menu.player_name()
	_rng.seed = WORLD_SEED
	_build_environment()
	_build_track()
	_build_stations()
	world = WorldScript.new()
	add_child(world)
	world.build(_rng, track, stations)
	_build_train()
	_build_player()
	_build_ui()
	audio = AudioScript.new()
	add_child(audio)
	players[my_id] = _new_player_entry(my_name)
	menu.hide_menu()
	player.capture_mouse(true)
	started = true
	if _load_on_begin:
		load_game()
	if mode == Mode.CLIENT:
		rpc_id(1, "net_hello", my_name)

func _new_player_entry(pname: String) -> Dictionary:
	return {"s": 0.0, "x": 0.0, "yaw": 0.0, "carrying": 0, "avatar": null,
		"name": pname, "tpos": Vector3.ZERO, "tyaw": 0.0}

# --- Aufbau ---------------------------------------------------------------

func _build_environment() -> void:
	var sky_mat := ProceduralSkyMaterial.new()
	sky_mat.sky_top_color = Color("5fa8e0")
	sky_mat.sky_horizon_color = Color("cfe6f0")
	sky_mat.ground_bottom_color = Color("bdb6a6")
	sky_mat.ground_horizon_color = Color("d8e2e6")
	sky_mat.sun_angle_max = 30.0
	var sky := Sky.new()
	sky.sky_material = sky_mat
	var env := Environment.new()
	env.background_mode = Environment.BG_SKY
	env.sky = sky
	env.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
	env.ambient_light_color = Color("d5dde2")
	env.ambient_light_energy = 0.62
	env.tonemap_mode = Environment.TONE_MAPPER_FILMIC
	env.tonemap_white = 4.0
	var we := WorldEnvironment.new()
	we.environment = env
	add_child(we)

	var sun := DirectionalLight3D.new()
	sun.rotation_degrees = Vector3(-48, -125, 0)
	sun.light_energy = 1.5
	sun.light_color = Color("fff2dd")
	sun.shadow_enabled = true
	sun.light_angular_distance = 1.4
	sun.directional_shadow_max_distance = 260.0
	sun.shadow_bias = 0.06
	add_child(sun)

func _build_track() -> void:
	track = TrackScript.new()
	add_child(track)
	var tal: int = track.add_segment("Talstrecke", SEG_TAL, T1, T2)
	var berg: int = track.add_segment("Bergstrecke", SEG_BERG, T1, T2)
	var heim: int = track.add_segment("Heimstrecke", SEG_HEIM, T2, T1)
	track.connect_segments(heim, tal)    # Nachfolger 0 = links
	track.connect_segments(heim, berg)   # Nachfolger 1 = rechts
	track.connect_segments(tal, heim)
	track.connect_segments(berg, heim)
	track.finish()

func _build_stations() -> void:
	for d in STATION_DEFS:
		var st := StationScript.new()
		add_child(st)
		var acc: Array[int] = []
		for t in d[4]:
			acc.append(int(t))
		var seg_id := int(d[1])
		st.setup(String(d[0]), seg_id, track.seg_length(seg_id) * float(d[2]), int(d[3]), acc)
		st.build_visuals(track.sample(seg_id, st.progress), float(d[5]),
			Color(String(d[6])), Color(String(d[7])), bool(d[8]))
		if st.produces >= 0:
			st.stock = 8.0
		stations.append(st)

func _build_train() -> void:
	train = TrainScript.new()
	add_child(train)
	train.setup(track, stations)
	train.consist = ["coach", "freight"] as Array[String]
	train.rebuild()
	_park_at(stations[0])

## Stellt den Zug mittig an einen Bahnsteig.
func _park_at(st) -> void:
	train.speed = 0.0
	train.place_head(st.seg, st.progress + train.total_length() * 0.5)
	train._update_dock(0.0)

func _build_player() -> void:
	player = PlayerScript.new()
	add_child(player)
	player.setup(train)
	player.interact_pressed.connect(_on_interact)

	cam_rig = CameraRig.new()
	add_child(cam_rig)
	cam_rig.target = train.cars[0]
	cam_rig.snap_to(train.cars[0].global_position)
	player.camera.current = true

func _build_ui() -> void:
	hud = HudScript.new()
	add_child(hud)
	shop = ShopScript.new()
	add_child(shop)
	shop.setup(self)
	shop.closed.connect(_on_shop_closed)

# --- Ablauf ---------------------------------------------------------------

func _process(delta: float) -> void:
	if not started:
		return
	if is_server():
		for st in stations:
			st.tick(delta)
		_spawn_passengers(delta)
		_update_passengers(delta)
		_handle_station_stop(delta)
		_track_visits()
		_autosave -= delta
		if _autosave <= 0.0:
			_autosave = AUTOSAVE_SEC
			save_game()
	_handle_hold_actions(delta)
	_update_audio(delta)
	_sync_out(delta)
	_update_avatars()
	hud.refresh(self)

func _physics_process(delta: float) -> void:
	if not started:
		return
	var driving: bool = driver_id == my_id and not player.input_locked
	var th := 0.0
	var br := false
	var sw: int = train.switch_choice
	if driving:
		th = 1.0 if Input.is_key_pressed(KEY_W) else 0.0
		br = Input.is_key_pressed(KEY_S) or Input.is_key_pressed(KEY_SPACE)
		if Input.is_key_pressed(KEY_A):
			sw = 0
		elif Input.is_key_pressed(KEY_D):
			sw = 1
	if is_server():
		if driver_id == my_id:
			train.throttle = th
			train.braking = br
			train.switch_choice = sw
		train.drive(delta)
	else:
		if driving:
			rpc_id(1, "net_controls", th, br, sw)
		train.client_tick(delta)

func _notification(what: int) -> void:
	if what == NOTIFICATION_WM_CLOSE_REQUEST and started and is_server():
		save_game()

func _unhandled_input(event: InputEvent) -> void:
	if not started:
		return
	if event is InputEventKey and event.pressed and not event.echo:
		match event.keycode:
			KEY_F5:
				if is_server():
					save_game()
					hud.toast("Gespeichert", Color("8fd8ff"))
			KEY_H:
				if driver_id == my_id:
					request("whistle")
			KEY_M:
				hud.toast("Musik %s" % ("an" if audio.toggle_music() else "aus"),
					Color("8fd8ff"))
			KEY_V:
				_toggle_camera()
			KEY_ESCAPE:
				if shop.is_open:
					shop.close()
				else:
					player.capture_mouse(Input.mouse_mode != Input.MOUSE_MODE_CAPTURED)

func _toggle_camera() -> void:
	_exterior = not _exterior
	if _exterior:
		cam_rig.activate()
	else:
		player.camera.current = true

# --- Klang ----------------------------------------------------------------

func _update_audio(delta: float) -> void:
	audio.update_train(train.speed, train.max_speed(), train.braking, delta)
	audio.update_steps(player.move_speed(), delta)
	# Ankunft und Auszischen beim Halten
	if train.docked_at != _last_dock:
		if train.docked_at != null and train.speed < 0.1:
			audio.play_at("bell", train.docked_at.global_position, -6.0)
		_last_dock = train.docked_at
	if _last_speed > 2.0 and train.speed < 0.2:
		audio.play_at("hiss", _loco_pos(), -10.0)
	_last_speed = train.speed

func _loco_pos() -> Vector3:
	return train.cars[0].global_position if not train.cars.is_empty() else global_position

func _play_sfx(name: String, at_loco := false, db := 0.0) -> void:
	if at_loco:
		audio.play_at(name, _loco_pos(), db)
	else:
		audio.play(name, db)

## Klang bei allen Mitspielern auslösen.
func _broadcast_sfx(name: String, at_loco := false, db := 0.0) -> void:
	_play_sfx(name, at_loco, db)
	if mode == Mode.HOST:
		rpc("net_sfx", name, at_loco, db)

## Klang nur bei einem bestimmten Spieler.
func _sfx_to(peer: int, name: String, db := 0.0) -> void:
	if peer == my_id:
		_play_sfx(name, false, db)
	elif networked():
		rpc_id(peer, "net_sfx", name, false, db)

# --- Netzwerk: Ausgang ----------------------------------------------------

func _sync_out(delta: float) -> void:
	if not networked():
		players[my_id]["s"] = player.s
		players[my_id]["x"] = player.x
		players[my_id]["yaw"] = player.yaw
		return
	_pose_timer -= delta
	if _pose_timer <= 0.0:
		_pose_timer = 1.0 / POSE_HZ
		if is_server():
			players[my_id]["s"] = player.s
			players[my_id]["x"] = player.x
			players[my_id]["yaw"] = player.yaw
			rpc("net_poses", _pose_payload())
			rpc("net_train", train.seg, train.progress, train.speed, train.switch_choice, train.history)
		else:
			rpc_id(1, "net_pose", player.s, player.x, player.yaw)
	if is_server():
		_state_timer -= delta
		if _state_timer <= 0.0:
			_state_timer = 1.0 / STATE_HZ
			rpc("net_state", _state_payload())
			rpc("net_passengers", _passenger_payload())

func _pose_payload() -> Array:
	var out: Array = []
	for id in players.keys():
		var e: Dictionary = players[id]
		out.append([int(id), float(e["s"]), float(e["x"]), float(e["yaw"]), int(e["carrying"])])
	return out

func _state_payload() -> Dictionary:
	var stock: Array = []
	for st in stations:
		stock.append(st.stock)
	var names := {}
	for id in players.keys():
		names[int(id)] = String(players[id]["name"])
	return {
		"money": money, "rep": reputation, "upg": upgrades.keys(),
		"driver": driver_id, "cargo": train.cargo.duplicate(), "stock": stock,
		"loco": train.loco_id, "consist": train.consist.duplicate(),
		"names": names, "goals": goals_done.keys(), "won": won,
		"tickets": tickets_checked, "delivered": delivered_units,
	}

func _passenger_payload() -> Array:
	var out: Array = []
	for p in passengers:
		out.append({
			"id": p.pid, "st": p.state, "dest": p.dest_station, "fare": p.fare,
			"chk": p.ticket_checked, "want": p.wants_drink, "srv": p.served,
			"mood": p.mood, "car": p.seat_car, "seat": p.seat_index,
			"pos": p.global_position, "yaw": p.global_rotation.y,
		})
	return out

# --- Netzwerk: Eingang ----------------------------------------------------

@rpc("any_peer", "call_remote", "unreliable_ordered")
func net_pose(s: float, x: float, yaw: float) -> void:
	var id := multiplayer.get_remote_sender_id()
	if not players.has(id):
		players[id] = _new_player_entry("Crew %d" % id)
	players[id]["s"] = s
	players[id]["x"] = x
	players[id]["yaw"] = yaw

@rpc("authority", "call_remote", "unreliable_ordered")
func net_poses(list: Array) -> void:
	var seen := {}
	for e in list:
		var id := int(e[0])
		seen[id] = true
		if not players.has(id):
			players[id] = _new_player_entry("Crew %d" % id)
		if id != my_id:
			players[id]["s"] = float(e[1])
			players[id]["x"] = float(e[2])
			players[id]["yaw"] = float(e[3])
		players[id]["carrying"] = int(e[4])
		if id == my_id:
			player.carrying = int(e[4])
	for id in players.keys():
		if not seen.has(id):
			_drop_player(int(id))

@rpc("authority", "call_remote", "unreliable_ordered")
func net_train(seg_id: int, p: float, v: float, sw: int, hist: Array) -> void:
	train.apply_snapshot(seg_id, p, v, sw, hist)

@rpc("authority", "call_remote", "reliable")
func net_state(d: Dictionary) -> void:
	money = int(d["money"])
	reputation = int(d["rep"])
	upgrades.clear()
	for k in d["upg"]:
		upgrades[String(k)] = true
	driver_id = int(d["driver"])
	for id in d["names"].keys():
		if not players.has(int(id)):
			players[int(id)] = _new_player_entry(String(d["names"][id]))
		players[int(id)]["name"] = String(d["names"][id])
	goals_done.clear()
	for g in d["goals"]:
		goals_done[String(g)] = true
	won = bool(d["won"])
	tickets_checked = int(d["tickets"])
	delivered_units = int(d["delivered"])
	if driver_id != my_id and player.mode == PlayerScript.Mode.DRIVE:
		player.mode = PlayerScript.Mode.WALK
	elif driver_id == my_id:
		player.mode = PlayerScript.Mode.DRIVE
	var stock: Array = d["stock"]
	for i in mini(stock.size(), stations.size()):
		stations[i].stock = float(stock[i])
	var loco := String(d["loco"])
	var consist: Array = d["consist"]
	if loco != train.loco_id or consist != Array(train.consist):
		train.loco_id = loco
		var typed: Array[String] = []
		for c in consist:
			typed.append(String(c))
		train.consist = typed
		_rebuild_train()
	train.cargo = (d["cargo"] as Dictionary).duplicate()
	train.refresh_cargo_visuals()
	if shop.is_open:
		shop.refresh()

@rpc("authority", "call_remote", "reliable")
func net_passengers(list: Array) -> void:
	for c in train.cars:
		for sd in c.seats:
			sd["occupant"] = null
	var seen := {}
	for e in list:
		var pid := int(e["id"])
		seen[pid] = true
		var p = _by_pid.get(pid)
		if p == null:
			p = _make_passenger(pid)
		p.state = int(e["st"])
		p.dest_station = int(e["dest"])
		p.fare = int(e["fare"])
		p.ticket_checked = bool(e["chk"])
		p.wants_drink = bool(e["want"])
		p.served = bool(e["srv"])
		p.mood = float(e["mood"])
		p.seat_car = int(e["car"])
		p.seat_index = int(e["seat"])
		_place_remote_passenger(p, e)
		p._refresh_label()
	for pid in _by_pid.keys():
		if not seen.has(pid):
			var p = _by_pid[pid]
			passengers.erase(p)
			p.queue_free()
			_by_pid.erase(pid)

@rpc("authority", "call_remote", "reliable")
func net_toast(text: String, color: Color) -> void:
	hud.toast(text, color)

@rpc("any_peer", "call_remote", "reliable")
func net_sfx(name: String, at_loco: bool, db: float) -> void:
	_play_sfx(name, at_loco, db)

@rpc("any_peer", "call_remote", "unreliable_ordered")
func net_controls(th: float, br: bool, sw: int) -> void:
	if not is_server():
		return
	if multiplayer.get_remote_sender_id() != driver_id:
		return
	train.throttle = th
	train.braking = br
	train.switch_choice = sw

@rpc("any_peer", "call_remote", "reliable")
func net_hello(pname: String) -> void:
	if not is_server():
		return
	var id := multiplayer.get_remote_sender_id()
	if not players.has(id):
		players[id] = _new_player_entry(pname)
	players[id]["name"] = pname
	_broadcast_toast("%s ist an Bord" % pname, Color("8fd8ff"))
	_push_state()

@rpc("any_peer", "call_remote", "reliable")
func net_request(action: String, a: String, b: int, c: int) -> void:
	if not is_server():
		return
	_do_request(multiplayer.get_remote_sender_id(), action, a, b, c)

func _place_remote_passenger(p, e: Dictionary) -> void:
	if p.state == PassengerScript.State.SEATED or p.state == PassengerScript.State.BOARDING:
		if p.seat_car < 0 or p.seat_car >= train.cars.size():
			return
		var car = train.cars[p.seat_car]
		if p.seat_index < 0 or p.seat_index >= car.seats.size():
			return
		if p.get_parent() != car:
			p.reparent(car, false)
		var seat: Dictionary = car.seats[p.seat_index]
		seat["occupant"] = p
		p.position = Vector3(seat["pos"].x, seat["pos"].y + 0.42 - 0.8, seat["pos"].z)
		p.rotation = Vector3(0, float(seat["yaw"]), 0)
		p.set_seated(true)
	else:
		if p.get_parent() != self:
			p.reparent(self, false)
		p.global_position = e["pos"]
		p.global_rotation = Vector3(0, float(e["yaw"]), 0)
		p.set_seated(false)

func _make_passenger(pid: int):
	var p := PassengerScript.new()
	var r := RandomNumberGenerator.new()
	r.seed = pid * 7919 + 13
	p.build(r)
	p.pid = pid
	add_child(p)
	passengers.append(p)
	_by_pid[pid] = p
	return p

# --- Peers ----------------------------------------------------------------

func _on_peer_connected(id: int) -> void:
	if not is_server() or not started:
		return
	players[id] = _new_player_entry("Crew %d" % id)
	rpc_id(id, "net_state", _state_payload())
	rpc_id(id, "net_passengers", _passenger_payload())

func _on_peer_disconnected(id: int) -> void:
	var pname: String = String(players.get(id, {}).get("name", "Crew %d" % id))
	_drop_player(id)
	if driver_id == id:
		driver_id = 0
	if hud:
		hud.toast("%s hat den Zug verlassen" % pname, Color("ffd978"))

func _drop_player(id: int) -> void:
	if id == my_id or not players.has(id):
		return
	var av = players[id]["avatar"]
	if av != null:
		av.queue_free()
	players.erase(id)

func _update_avatars() -> void:
	for id in players.keys():
		if int(id) == my_id:
			continue
		var e: Dictionary = players[id]
		if e["avatar"] == null:
			var av := AvatarScript.new()
			av.build(int(id), String(e["name"]))
			add_child(av)
			e["avatar"] = av
		var av2 = e["avatar"]
		var loc: Dictionary = train.locate(float(e["s"]))
		var xf: Transform3D = train.car_transform(int(loc["index"]))
		# Zielpose im Wagenraum; Bewegung wird geglättet, die Wagenlage nicht
		var tp: Vector3 = Vector3(float(e["x"]), 1.10, float(loc["local_z"]))
		var ty: float = float(e["yaw"])
		var k: float = clampf(get_process_delta_time() * 14.0, 0.0, 1.0)
		e["tpos"] = (e["tpos"] as Vector3).lerp(tp, k) if e["tpos"] != Vector3.ZERO else tp
		e["tyaw"] = lerp_angle(float(e["tyaw"]), ty, k)
		av2.global_position = xf * (e["tpos"] as Vector3)
		av2.global_rotation = Vector3(0, xf.basis.get_euler().y + float(e["tyaw"]), 0)
		av2.set_carrying(int(e["carrying"]))
		av2.set_label("%s%s" % [String(e["name"]), "  (Führerstand)" if int(id) == driver_id else ""])

# --- Fahrgäste -----------------------------------------------------------

func _spawn_passengers(delta: float) -> void:
	_spawn_timer -= delta
	if _spawn_timer > 0.0:
		return
	_spawn_timer = SPAWN_INTERVAL
	spawn_passenger(_rng.randi() % stations.size())

func spawn_passenger(idx: int, forced_dest := -1) -> bool:
	var st = stations[idx]
	if st.waiting.size() >= st.waiting_spots.size():
		return false
	var dest := forced_dest
	if dest < 0:
		dest = idx
		while dest == idx:
			dest = _rng.randi() % stations.size()
	var pid := _next_pid
	_next_pid += 1
	var p = _make_passenger(pid)
	p.origin_station = idx
	p.dest_station = dest
	p.fare = _fare(idx, dest)
	var spot: Vector3 = st.waiting_spots[st.waiting.size()]
	p.global_position = spot
	p.global_rotation = Vector3(0, track.sample(st.seg, st.progress).basis.get_euler().y + PI * 0.5 * st.side, 0)
	st.waiting.append(p)
	return true

func _fare(a: int, b: int) -> int:
	var d: float = stations[a].global_position.distance_to(stations[b].global_position) * 1.6
	var bonus := 1.0
	for c in train.cars:
		if c.id == "saloon":
			bonus = 1.5
			break
	return int(round((14.0 + d * 0.11) * bonus))

func _update_passengers(delta: float) -> void:
	var has_dining: bool = train.has_dining()
	for p in passengers.duplicate():
		match p.state:
			PassengerScript.State.SEATED:
				p.tick(delta, has_dining)
			PassengerScript.State.BOARDING:
				if p.advance_lerp(delta):
					_finish_boarding(p)
			PassengerScript.State.ALIGHTING:
				if p.advance_lerp(delta):
					_finish_alighting(p)

func _finish_boarding(p) -> void:
	var car = train.cars[p.seat_car]
	p.reparent(car, true)
	var seat: Dictionary = car.seats[p.seat_index]
	p.position = Vector3(seat["pos"].x, seat["pos"].y + 0.42 - 0.8, seat["pos"].z)
	p.rotation = Vector3(0, float(seat["yaw"]), 0)
	p.set_seated(true)
	p.state = PassengerScript.State.SEATED

func _finish_alighting(p) -> void:
	passengers.erase(p)
	_by_pid.erase(p.pid)
	p.queue_free()

func _handle_station_stop(delta: float) -> void:
	var st = train.docked_at
	if st == null or train.speed > 0.1:
		_board_timer = 0.0
		return
	_board_timer -= delta
	if _board_timer > 0.0:
		return
	_board_timer = BOARD_INTERVAL
	for p in passengers:
		if p.state == PassengerScript.State.SEATED and stations[p.dest_station] == st:
			_alight(p, st)
			return
	if st.waiting.is_empty():
		return
	var seat := _find_free_seat()
	if seat.is_empty():
		return
	var p2 = st.waiting.pop_front()
	_reindex_waiting(st)
	p2.seat_car = int(seat["car"])
	p2.seat_index = int(seat["index"])
	var car = train.cars[p2.seat_car]
	var sd: Dictionary = car.seats[p2.seat_index]
	sd["occupant"] = p2
	var target_xf: Transform3D = car.global_transform.translated_local(
		Vector3(sd["pos"].x, sd["pos"].y + 0.42 - 0.8, sd["pos"].z))
	target_xf.basis = car.global_transform.basis.rotated(Vector3.UP, float(sd["yaw"]))
	p2.set_seated(true)
	p2.state = PassengerScript.State.BOARDING
	p2.start_lerp(p2.global_transform, target_xf, 1.4)

func _alight(p, st) -> void:
	var car = train.cars[p.seat_car]
	car.seats[p.seat_index]["occupant"] = null
	p.reparent(self, true)
	p.set_seated(false)
	var spot: Vector3 = st.waiting_spots[_rng.randi() % st.waiting_spots.size()]
	p.state = PassengerScript.State.ALIGHTING
	p.start_lerp(p.global_transform, Transform3D(p.global_transform.basis, spot), 1.4)
	_settle_fare(p)

func _settle_fare(p) -> void:
	if not p.ticket_checked:
		reputation = maxi(0, reputation - 2)
		_broadcast_toast("Schwarzfahrer entkommen. Ansehen -2", Color("ff9a8a"))
		_broadcast_sfx("deny", false, -10.0)
		return
	if p.mood > 0.55:
		reputation += 1
	elif p.mood < 0.35:
		reputation = maxi(0, reputation - 1)

func _reindex_waiting(st) -> void:
	for i in st.waiting.size():
		st.waiting[i].global_position = st.waiting_spots[i]

func _find_free_seat() -> Dictionary:
	for ci in train.cars.size():
		var idx: int = train.cars[ci].free_seat()
		if idx >= 0:
			return {"car": ci, "index": idx}
	return {}

# --- Aktionen -------------------------------------------------------------

func _on_interact(h: Dictionary) -> void:
	var kind := String(h["kind"])
	audio.play("click", -16.0)
	match kind:
		"shop":
			_open_shop()
		"drive":
			request("drive", "", 0, 0)
		"tap":
			request("tap", "", 0, 0)
		"seat":
			request("seat", "", int(h["car"]), int(h["seat"]))

## Fuehrt eine Aktion aus - lokal beim Host, sonst als Anfrage.
func request(action: String, a := "", b := 0, c := 0) -> void:
	if is_server():
		_do_request(my_id, action, a, b, c)
	else:
		rpc_id(1, "net_request", action, a, b, c)

func _do_request(peer: int, action: String, a: String, b: int, c: int) -> void:
	match action:
		"drive": _srv_toggle_drive(peer)
		"tap": _srv_take_drinks(peer)
		"seat": _srv_use_seat(peer, b, c)
		"load": _srv_transfer_one(peer)
		"buy_loco": _srv_buy_loco(peer, a)
		"buy_car": _srv_buy_car(peer, a)
		"sell_car": _srv_sell_car(peer, b)
		"sell_loco": _srv_sell_loco(peer)
		"buy_upgrade": _srv_buy_upgrade(peer, a)
		"whistle": _srv_whistle(peer)

func _toast_to(peer: int, text: String, color: Color) -> void:
	if peer == my_id:
		hud.toast(text, color)
	elif networked():
		rpc_id(peer, "net_toast", text, color)

func _broadcast_toast(text: String, color: Color) -> void:
	hud.toast(text, color)
	if networked():
		rpc("net_toast", text, color)

func _srv_toggle_drive(peer: int) -> void:
	if driver_id == peer:
		driver_id = 0
		train.throttle = 0.0
		_toast_to(peer, "Steuerung abgegeben", Color("cfd8e0"))
	elif driver_id == 0:
		driver_id = peer
		_toast_to(peer, "Du fährst jetzt. W = Gas, S = Bremse", Color("aef2a0"))
	else:
		_toast_to(peer, "Der Führerstand ist besetzt", Color("ffd978"))
		_sfx_to(peer, "deny", -12.0)
	if peer == my_id:
		player.mode = PlayerScript.Mode.DRIVE if driver_id == my_id else PlayerScript.Mode.WALK
	_push_state()

func _srv_whistle(peer: int) -> void:
	if peer != driver_id:
		return
	_broadcast_sfx("whistle", true, -6.0)

func _srv_take_drinks(peer: int) -> void:
	if not train.has_dining():
		return
	var n := 3 if upgrades.has("trolley") else 1
	_set_carrying(peer, n)
	_toast_to(peer, "%d Getränk(e) aufgenommen" % n, Color("8fd8ff"))
	_sfx_to(peer, "pour", -9.0)

func _carrying(peer: int) -> int:
	return int(players.get(peer, {}).get("carrying", 0))

func _set_carrying(peer: int, n: int) -> void:
	if not players.has(peer):
		players[peer] = _new_player_entry("Crew %d" % peer)
	players[peer]["carrying"] = n
	if peer == my_id:
		player.carrying = n

func _srv_use_seat(peer: int, car_index: int, seat_index: int) -> void:
	if car_index < 0 or car_index >= train.cars.size():
		return
	var car = train.cars[car_index]
	if seat_index < 0 or seat_index >= car.seats.size():
		return
	var occ = car.seats[seat_index]["occupant"]
	if occ == null:
		return
	if not occ.ticket_checked:
		if upgrades.has("scanner"):
			_check_all_tickets(peer)
		else:
			_check_ticket(occ, peer)
		return
	if occ.wants_drink and not occ.served:
		if _carrying(peer) <= 0:
			_toast_to(peer, "Kein Getränk dabei. Ab in den Speisewagen!", Color("ffd978"))
			_sfx_to(peer, "deny", -12.0)
			return
		_set_carrying(peer, _carrying(peer) - 1)
		occ.served = true
		occ.wants_drink = false
		occ.mood = minf(occ.mood + 0.4, 1.0)
		money += DRINK_TIP
		_toast_to(peer, "Serviert. Trinkgeld +%d €" % DRINK_TIP, Color("aef2a0"))
		_sfx_to(peer, "clink", -7.0)
		occ._refresh_label()
		_push_state()
		return
	_toast_to(peer, "%s - %s" % [stations[occ.dest_station].station_name, occ.mood_word()],
		Color("cfd8e0"))

func _check_ticket(p, peer: int) -> void:
	p.ticket_checked = true
	tickets_checked += 1
	money += p.fare
	_toast_to(peer, "Ticket nach %s  +%d €" % [stations[p.dest_station].station_name, p.fare],
		Color("aef2a0"))
	_sfx_to(peer, "coin", -6.0)
	p._refresh_label()
	_push_state()

func _check_all_tickets(peer: int) -> void:
	var sum := 0
	var n := 0
	for p in passengers:
		if p.state == PassengerScript.State.SEATED and not p.ticket_checked:
			p.ticket_checked = true
			tickets_checked += 1
			sum += p.fare
			n += 1
			p._refresh_label()
	money += sum
	_toast_to(peer, "%d Tickets gescannt  +%d €" % [n, sum], Color("aef2a0"))
	_sfx_to(peer, "coin", -4.0)
	_push_state()

func _handle_hold_actions(delta: float) -> void:
	if player.input_locked or player.hotspot.is_empty() \
			or String(player.hotspot.get("kind", "")) != "load" \
			or not Input.is_key_pressed(KEY_E):
		_load_timer = 0.0
		return
	if train.docked_at == null or train.speed > 0.1:
		return
	_load_timer -= delta
	if _load_timer > 0.0:
		return
	_load_timer = LOAD_INTERVAL * (0.5 if upgrades.has("loader") else 1.0)
	request("load")

func _srv_transfer_one(peer: int) -> void:
	var st = train.docked_at
	if st == null or train.speed > 0.1:
		return
	for t in st.accepts:
		if int(train.cargo.get(t, 0)) > 0:
			train.remove_cargo(int(t), 1)
			money += Cargo.PRICES[int(t)]
			delivered_units += 1
			if delivered_units % 10 == 0:
				reputation += 1
			_toast_to(peer, "%s geliefert  +%d €" % [Cargo.NAMES[int(t)], Cargo.PRICES[int(t)]],
				Color("aef2a0"))
			_broadcast_sfx("thud", false, -11.0)
			_sfx_to(peer, "coin", -12.0)
			_push_state()
			return
	if st.produces >= 0 and st.stock >= 1.0:
		if train.total_cargo() >= train.cargo_capacity():
			_toast_to(peer, "Kein Platz mehr im Güterwagen", Color("ffd978"))
			_sfx_to(peer, "deny", -12.0)
			return
		if train.add_cargo(st.produces, 1) > 0:
			st.stock -= 1.0
			_broadcast_sfx("thud", false, -11.0)
			_push_state()

func _push_state() -> void:
	if is_server():
		_check_goals()
	if mode == Mode.HOST:
		rpc("net_state", _state_payload())

func _track_visits() -> void:
	if train.docked_at != null and train.speed < 0.1:
		var nm: String = train.docked_at.station_name
		if not visited.has(nm):
			visited[nm] = true
			_check_goals()

## Aktuelles Ziel und Fortschritt, für das HUD.
func current_goal() -> Dictionary:
	for g in GOALS:
		if not goals_done.has(String(g["id"])):
			return {"text": String(g["text"]), "progress": _goal_progress(g), "target": int(g["value"])}
	return {}

func _goal_progress(g: Dictionary) -> int:
	match String(g["kind"]):
		"tickets": return tickets_checked
		"cargo": return delivered_units
		"rep": return reputation
		"dining": return 1 if train.has_dining() else 0
		"visit": return 1 if visited.has("Bergblick") else 0
		"final": return reputation if train.loco_id == "express" and train.consist.size() >= 5 else 0
	return 0

func _check_goals() -> void:
	for g in GOALS:
		var id := String(g["id"])
		if goals_done.has(id):
			continue
		if _goal_progress(g) < int(g["value"]):
			break   # Ziele kommen der Reihe nach
		goals_done[id] = true
		money += int(g["reward"])
		if id == "final":
			won = true
			_broadcast_toast("Linie ausgebaut! Ihr habt es geschafft.  +%d €" % int(g["reward"]),
				Color("ffd978"))
		else:
			_broadcast_toast("Ziel erreicht: %s  +%d €" % [String(g["text"]), int(g["reward"])],
				Color("ffd978"))
		_broadcast_sfx("bell", false, -8.0)
		save_game()

# --- Laden ----------------------------------------------------------------

func _open_shop() -> void:
	player.input_locked = true
	player.capture_mouse(false)
	shop.open()

func _on_shop_closed() -> void:
	player.input_locked = false
	player.capture_mouse(true)

func can_buy(price: int, rep: int) -> bool:
	return money >= price and reputation >= rep

func _srv_buy_loco(peer: int, id: String) -> void:
	if not Defs.LOCOS.has(id):
		return
	var d: Dictionary = Defs.LOCOS[id]
	if id == train.loco_id or not can_buy(int(d["price"]), int(d["rep"])):
		return
	money -= int(d["price"])
	money += int(Defs.LOCOS[train.loco_id]["sell"])
	train.loco_id = id
	_rebuild_train()
	_broadcast_toast("Neue Lok: %s" % String(d["name"]), Color("aef2a0"))
	_broadcast_sfx("coin", false, -5.0)
	_push_state()

func _srv_buy_car(peer: int, id: String) -> void:
	if not Defs.CARS.has(id):
		return
	var d: Dictionary = Defs.CARS[id]
	if not can_buy(int(d["price"]), int(d["rep"])) or train.consist.size() >= 6:
		return
	money -= int(d["price"])
	train.consist.append(id)
	_rebuild_train()
	_broadcast_toast("Angehaengt: %s" % String(d["name"]), Color("aef2a0"))
	_push_state()

func _srv_sell_car(peer: int, index: int) -> void:
	if index < 0 or index >= train.consist.size():
		return
	var id: String = train.consist[index]
	money += int(Defs.CARS[id]["sell"])
	train.consist.remove_at(index)
	_rebuild_train()
	_broadcast_toast("Verkauft: %s" % Defs.display_name(id), Color("ffd978"))
	_broadcast_sfx("coin", false, -5.0)
	_push_state()

## Die Lok geht zurück ans Depot, der Dampf-Veteran springt ein.
func _srv_sell_loco(peer: int) -> void:
	if train.loco_id == "steam":
		return
	var d: Dictionary = Defs.LOCOS[train.loco_id]
	money += int(d["sell"])
	train.loco_id = "steam"
	_rebuild_train()
	_broadcast_toast("Verkauft: %s  +%d €" % [String(d["name"]), int(d["sell"])], Color("ffd978"))
	_broadcast_sfx("coin", false, -5.0)
	_push_state()

func _srv_buy_upgrade(peer: int, id: String) -> void:
	if not Defs.UPGRADES.has(id):
		return
	var d: Dictionary = Defs.UPGRADES[id]
	if upgrades.has(id) or not can_buy(int(d["price"]), int(d["rep"])):
		return
	money -= int(d["price"])
	upgrades[id] = true
	_broadcast_toast("Ausbau: %s" % String(d["name"]), Color("aef2a0"))
	_broadcast_sfx("coin", false, -5.0)
	_push_state()

# Bequeme Namen für Tests und die Ladenoberflaeche.
func buy_loco(id: String) -> bool:
	var before: String = train.loco_id
	request("buy_loco", id)
	return train.loco_id != before

func buy_car(id: String) -> bool:
	var before: int = train.consist.size()
	request("buy_car", id)
	return train.consist.size() != before

func sell_car(index: int) -> bool:
	var before: int = train.consist.size()
	request("sell_car", "", index)
	return train.consist.size() != before

func buy_upgrade(id: String) -> bool:
	var before := upgrades.size()
	request("buy_upgrade", id)
	return upgrades.size() != before

# --- Spielstand -------------------------------------------------------------

func save_game() -> void:
	if not is_server():
		return
	var stock: Array = []
	for st in stations:
		stock.append(st.stock)
	var data := {
		"money": money, "rep": reputation, "upg": upgrades.keys(),
		"delivered": delivered_units, "tickets": tickets_checked,
		"visited": visited.keys(), "goals": goals_done.keys(), "won": won,
		"loco": train.loco_id, "consist": train.consist,
		"seg": train.seg, "progress": train.progress, "cargo": train.cargo,
		"stock": stock,
	}
	var f := FileAccess.open(SAVE_PATH, FileAccess.WRITE)
	if f == null:
		return
	f.store_string(JSON.stringify(data))
	f.close()

func load_game() -> bool:
	if not FileAccess.file_exists(SAVE_PATH):
		return false
	var f := FileAccess.open(SAVE_PATH, FileAccess.READ)
	if f == null:
		return false
	var parsed = JSON.parse_string(f.get_as_text())
	f.close()
	if not (parsed is Dictionary):
		return false
	var d: Dictionary = parsed
	money = int(d.get("money", START_MONEY))
	reputation = int(d.get("rep", 0))
	upgrades.clear()
	for k in d.get("upg", []):
		upgrades[String(k)] = true
	delivered_units = int(d.get("delivered", 0))
	tickets_checked = int(d.get("tickets", 0))
	visited.clear()
	for k in d.get("visited", []):
		visited[String(k)] = true
	goals_done.clear()
	for k in d.get("goals", []):
		goals_done[String(k)] = true
	won = bool(d.get("won", false))
	var loco := String(d.get("loco", "steam"))
	if Defs.LOCOS.has(loco):
		train.loco_id = loco
	var typed: Array[String] = []
	for c in d.get("consist", []):
		if Defs.CARS.has(String(c)):
			typed.append(String(c))
	train.consist = typed
	train.cargo.clear()
	var cargo: Dictionary = d.get("cargo", {})
	for k in cargo.keys():
		train.cargo[int(k)] = int(cargo[k])
	var stock: Array = d.get("stock", [])
	for i in mini(stock.size(), stations.size()):
		stations[i].stock = float(stock[i])
	_rebuild_train()
	var seg_id := int(d.get("seg", 0))
	if seg_id >= 0 and seg_id < track.segments.size():
		train.place_head(seg_id, float(d.get("progress", 0.0)))
		train._update_dock(0.0)
	hud.toast("Spielstand geladen", Color("8fd8ff"))
	return true

func _rebuild_train() -> void:
	# Sitzende Gaeste zwischenparken, sonst verschwinden sie mit dem alten Wagen.
	var riders: Array = []
	for p in passengers.duplicate():
		if p.state == PassengerScript.State.SEATED or p.state == PassengerScript.State.BOARDING:
			p.reparent(self, true)
			riders.append(p)
	train.rebuild()
	for p in riders:
		var seat := _find_free_seat()
		if seat.is_empty():
			passengers.erase(p)
			_by_pid.erase(p.pid)
			p.queue_free()
			continue
		p.seat_car = int(seat["car"])
		p.seat_index = int(seat["index"])
		train.cars[p.seat_car].seats[p.seat_index]["occupant"] = p
		_finish_boarding(p)
	cam_rig.target = train.cars[0]
	player.snap_to_cab()
	if driver_id == my_id:
		player.mode = PlayerScript.Mode.DRIVE