class_name Net
extends Node
## LAN-Mehrspieler: der Host führt das Spiel, Mitspieler senden Aktionen und erhalten
## Zustandsbilder aus ihrer Sicht (fremde Hände bleiben verborgen).

signal lobby_changed
signal started(seat: int)
signal snapshot_received(snap: Dictionary)
signal action_applied
signal ended(reason: String)

const PORT := 24455

var peer: ENetMultiplayerPeer
var is_host := false
var connected := false
var my_name := "Spieler"
var my_deck: Array = []   # Karten-IDs
var names := {}           # peer_id -> Name (nur im Host vollständig, sonst Kopie)
var decks := {}           # peer_id -> Karten-IDs (Host)
var seats := {}           # peer_id -> Spielerindex (Host)
var my_seat := -1
var game: Game            # Host
var status := ""
var waiting := {}         # Name -> {"seat": int, "since": float}: Platz nach Verbindungsabbruch freihalten
const REJOIN_SECONDS := 60.0


func _ready() -> void:
    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(func(): _fail("Verbindung fehlgeschlagen"))
    multiplayer.server_disconnected.connect(func(): _fail("Host hat das Spiel beendet"))


func host(port: int = PORT) -> Error:
    peer = ENetMultiplayerPeer.new()
    var err := peer.create_server(port, Game.MAX_OPPONENTS)
    if err != OK:
        status = "Kann nicht hosten (Port %d belegt?)" % port
        return err
    multiplayer.multiplayer_peer = peer
    is_host = true
    connected = true
    names = {1: my_name}
    decks = {1: my_deck}
    status = "Warte auf Mitspieler …"
    lobby_changed.emit()
    return OK


func join(ip: String, port: int = PORT) -> Error:
    peer = ENetMultiplayerPeer.new()
    var err := peer.create_client(ip, port)
    if err != OK:
        status = "Adresse ungültig"
        return err
    multiplayer.multiplayer_peer = peer
    is_host = false
    status = "Verbinde mit %s …" % ip
    return OK


func leave() -> void:
    if multiplayer.multiplayer_peer != null:
        multiplayer.multiplayer_peer.close()
    multiplayer.multiplayer_peer = OfflineMultiplayerPeer.new()
    peer = null
    is_host = false
    connected = false
    names = {}
    decks = {}
    seats = {}
    waiting = {}
    my_seat = -1
    game = null
    status = ""


func local_addresses() -> Array:
    return Array(IP.get_local_addresses()).filter(func(a): return "." in a and not a.begins_with("127."))


func _fail(reason: String) -> void:
    status = reason
    ended.emit(reason)
    leave()


func _on_connected() -> void:
    connected = true
    status = "Verbunden"
    register.rpc_id(1, my_name, my_deck)


func _on_peer_connected(_id: int) -> void:
    pass


func _on_peer_disconnected(id: int) -> void:
    if not is_host:
        return
    var pname: String = names.get(id, "")
    names.erase(id)
    decks.erase(id)
    if game != null and seats.has(id):
        var p: Game.Player = game.players[seats[id]]
        if game.winner == "":
            waiting[pname] = {"seat": seats[id], "since": Time.get_unix_time_from_system()}
            game.say("%s hat die Verbindung verloren, der Platz bleibt %d s frei." % [p.name, int(REJOIN_SECONDS)])
        seats.erase(id)
        action_applied.emit()
    lobby_update.rpc(names)
    lobby_changed.emit()


## Host, je Bild: wartende Spieler überspringen; nach Ablauf der Frist scheiden sie aus.
func tick() -> void:
    if not is_host or game == null or game.winner != "":
        return
    var now := Time.get_unix_time_from_system()
    for pname in waiting.keys():
        var w: Dictionary = waiting[pname]
        var p: Game.Player = game.players[w.seat]
        if now - float(w.since) > REJOIN_SECONDS:
            waiting.erase(pname)
            game.say("%s kehrt nicht zurück und scheidet aus." % p.name)
            game.damage(p, 999)
            game.check_end()
            action_applied.emit()
        elif game.current() == p:
            p.mulligan_done = true
            game.say("%s ist nicht da, der Zug wird übersprungen." % p.name)
            game.end_turn()
            action_applied.emit()


@rpc("any_peer", "reliable")
func register(name: String, deck_ids: Array) -> void:
    if not is_host:
        return
    var id := multiplayer.get_remote_sender_id()
    if game != null:
        # Laufendes Spiel: nur Rückkehr auf einen freigehaltenen Platz
        if waiting.has(name):
            seats[id] = waiting[name].seat
            names[id] = name
            waiting.erase(name)
            game.say("%s ist zurück." % name)
            start_game.rpc_id(id, seats[id])
            receive_snapshot.rpc_id(id, game.snapshot(seats[id]))
            action_applied.emit()
        else:
            status = "%s wollte beitreten, das Spiel läuft schon" % name
        return
    names[id] = name
    decks[id] = deck_ids
    lobby_update.rpc(names)
    lobby_changed.emit()


@rpc("authority", "reliable")
func lobby_update(n: Dictionary) -> void:
    names = n
    lobby_changed.emit()


## Host: Spiel mit allen Verbundenen und n_ai KI-Gegnern starten.
func start_battle(n_ai: int) -> void:
    var ids: Array = names.keys()
    ids.sort()
    var r := Game.make_rng()
    var players := []
    seats = {}
    for id in ids:
        var deck_ids: Array = decks.get(id, [])
        var deck := []
        for cid in deck_ids:
            if Cards.has_id(cid):
                deck.append(Cards.by_id(cid))
        if Game.validate_deck(deck)[0] == false:
            var pool: Array = Cards.ELEMENTS.duplicate()
            Game.shuffle(pool, r)
            deck = Game.build_opponent_deck(r, [pool[0], pool[1]])
        players.append(Game.Player.new(names[id], deck, true, Game.START_LIFE))
    for i in n_ai:
        players.append(Game.random_opponent(r, i + 1))
    game = Game.new(players[0], players.slice(1), r)
    game.start()
    for id in ids:
        seats[id] = game.players.find(players[ids.find(id)])
    my_seat = seats[1]
    for id in ids:
        if id != 1:
            start_game.rpc_id(id, seats[id])
    started.emit(my_seat)


@rpc("authority", "reliable")
func start_game(seat: int) -> void:
    my_seat = seat
    started.emit(seat)


## Host: Zustand an alle Mitspieler senden (jeder aus seiner Sicht).
func broadcast() -> void:
    if not is_host or game == null:
        return
    for id in seats:
        if id != 1:
            receive_snapshot.rpc_id(id, game.snapshot(seats[id]))


@rpc("authority", "reliable")
func receive_snapshot(snap: Dictionary) -> void:
    snapshot_received.emit(snap)


## Mitspieler: Aktion an den Host schicken.
func send_action(action: Dictionary) -> void:
    if is_host:
        _apply(1, action)
    else:
        request_action.rpc_id(1, action)


@rpc("any_peer", "reliable")
func request_action(action: Dictionary) -> void:
    if not is_host:
        return
    _apply(multiplayer.get_remote_sender_id(), action)


func _apply(id: int, action: Dictionary) -> void:
    if game == null or not seats.has(id):
        return
    var p: Game.Player = game.players[seats[id]]
    if game.current() != p or game.winner != "":
        return
    match str(action.get("type", "")):
        "play":
            var idx := int(action.get("hand", -1))
            if idx < 0 or idx >= p.hand.size():
                return
            game.play_card(p, p.hand[idx], resolve_ref(action.get("target")))
        "attack":
            var cr := game.find_creature(int(action.get("uid", -1)))
            var t = resolve_ref(action.get("target"))
            if cr != null and t != null:
                game.attack(cr, t)
        "mulligan":
            var cards := []
            for i in action.get("hand", []):
                if int(i) >= 0 and int(i) < p.hand.size():
                    cards.append(p.hand[int(i)])
            game.mulligan(p, cards)
        "end":
            game.end_turn()
        _:
            return
    action_applied.emit()


func resolve_ref(ref):
    if ref == null or not (ref is Dictionary):
        return null
    if ref.get("kind") == "creature":
        return game.find_creature(int(ref.get("uid", -1)))
    var i := int(ref.get("index", -1))
    if i >= 0 and i < game.players.size():
        return game.players[i]
    return null


static func ref_dict(target) -> Dictionary:
    if target is Game.Creature:
        return {"kind": "creature", "uid": target.uid}
    return {"kind": "player", "index": target.order}