extends Node3D
## Wurzelknoten: hält Spieler und Oberfläche, wechselt zwischen den Welten
## und wickelt Interaktionen ab.

const REICHWEITE_OBJEKT := 4.2
const REICHWEITE_MENSCH := 3.6

var player: Player
var ui: UI
var welt: Node3D
var auf_erde := false
var _fokus: Node3D = null
var _fokus_mensch: Node3D = null


func _ready() -> void:
	ui = UI.new()
	add_child(ui)
	ui.panel_opened.connect(func() -> void:
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
		player.look_enabled = false)
	ui.panel_closed.connect(func() -> void:
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
		player.look_enabled = true)

	player = Player.new()
	add_child(player)

	Game.mission_done.connect(func(_id: String) -> void:
		Game.notified.emit("Kehre zur Traumwelt zurück — die Säule im Park bringt dich hin.",
			Color(0.8, 0.95, 1)))

	_traumwelt()
	ui.intro_panel(func() -> void: pass)


func _traumwelt() -> void:
	auf_erde = false
	_setze_welt(DreamWorld.new())
	player.set_mode(Player.Mode.TRAUM)
	player.global_position = (welt as DreamWorld).spawn
	player.yaw = 0.0
	player.pitch = -0.18


func _erde() -> void:
	auf_erde = true
	_setze_welt(EarthWorld.new())
	player.set_mode(Player.Mode.GEIST)
	player.global_position = (welt as EarthWorld).spawn
	player.yaw = 0.0
	player.pitch = -0.42


func _setze_welt(neu: Node3D) -> void:
	if welt != null:
		remove_child(welt)
		welt.queue_free()
	welt = neu
	add_child(welt)
	move_child(welt, 0)
	Game.teleport_lock = 1.0
	_fokus = null
	_fokus_mensch = null


func _process(delta: float) -> void:
	Game.advance_time(delta)
	Game.teleport_lock = maxf(0.0, Game.teleport_lock - delta)
	if ui.offen:
		ui.setze_hinweis("")
		return
	_fokus_suchen()
	_hinweis_setzen()


func _fokus_suchen() -> void:
	_fokus = null
	_fokus_mensch = null
	var p := player.global_position
	var best := REICHWEITE_OBJEKT
	for n in get_tree().get_nodes_in_group("interactable"):
		var d: float = p.distance_to((n as Node3D).global_position)
		if d < best:
			best = d
			_fokus = n
	if auf_erde:
		var bestm := REICHWEITE_MENSCH
		for m in (welt as EarthWorld).humans:
			var d: float = p.distance_to((m as Node3D).global_position + Vector3(0, 1.0, 0))
			if d < bestm:
				bestm = d
				_fokus_mensch = m
		if _fokus_mensch != null and (_fokus == null or bestm < best):
			_fokus = null
		elif _fokus != null:
			_fokus_mensch = null


func _hinweis_setzen() -> void:
	if _fokus_mensch != null:
		ui.setze_hinweis("[E]  %s ansprechen — %s" %
			[_fokus_mensch.data["name"], HumanDB.activity_text(_fokus_mensch.activity)])
	elif _fokus != null:
		var kind: String = _fokus.get_meta("kind")
		var titel: String = _fokus.get_meta("titel")
		match kind:
			"technik":
				ui.setze_hinweis("[E]  %s%s" % [titel,
					"" if not Game.knows(_fokus.get_meta("arg")) else " (gelernt)"])
			"mission":
				ui.setze_hinweis("[E]  %s — Mission ansehen" % titel)
			"vertiefen":
				ui.setze_hinweis("[E]  Meditieren")
			"erde":
				ui.setze_hinweis("[E]  Zur Erde reisen")
			"traum":
				ui.setze_hinweis("[E]  Zurück in die Traumwelt")
			_:
				ui.setze_hinweis("[E]  %s" % titel)
	else:
		ui.setze_hinweis("")


func _unhandled_input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_cancel") and not ui.offen:
		Input.mouse_mode = Input.MOUSE_MODE_VISIBLE if \
			Input.mouse_mode == Input.MOUSE_MODE_CAPTURED else Input.MOUSE_MODE_CAPTURED
		player.look_enabled = Input.mouse_mode == Input.MOUSE_MODE_CAPTURED
		get_viewport().set_input_as_handled()
		return
	if ui.offen:
		return
	if event is InputEventMouseButton and event.pressed and Input.mouse_mode == Input.MOUSE_MODE_VISIBLE:
		Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
		player.look_enabled = true
		return
	if event.is_action_pressed("kodex"):
		ui.kodex_panel()
		get_viewport().set_input_as_handled()
		return
	if event.is_action_pressed("interagieren"):
		_interagieren()
		get_viewport().set_input_as_handled()


func _interagieren() -> void:
	if _fokus_mensch != null:
		ui.anwenden_panel(_fokus_mensch)
		return
	if _fokus == null:
		return
	var kind: String = _fokus.get_meta("kind")
	var arg: String = _fokus.get_meta("arg")
	match kind:
		"technik":
			ui.technik_panel(arg)
		"mission":
			ui.mission_panel(arg)
		"vertiefen":
			ui.vertiefen_panel()
		"erde":
			if Game.active_mission == "" and Game.completed.size() < HumanDB.LIST.size():
				Game.notified.emit(
					"Das Tor öffnet sich nur mit einer angenommenen Mission.", Color(1, 0.8, 0.5))
			else:
				_erde()
		"traum":
			_traumwelt()