using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;
using Vanguard.Api;
using Vanguard.Api.Contracts;
using Vanguard.Battle;
using Vanguard.Meta;
using Vanguard.Shared.Protocol;

namespace Vanguard.UI
{
    /// <summary>
    /// Серый боевой экран: доска, рука, часы и кнопки всех легальных интентов.
    /// Красоту и анимации добавим поверх этой рабочей логики.
    /// </summary>
    public sealed class BattleView
    {
        private static readonly Color Background = new Color(0.035f, 0.045f, 0.065f, 1f);
        private static readonly Color Panel = new Color(0.07f, 0.085f, 0.115f, 1f);
        private static readonly Color Card = new Color(0.10f, 0.13f, 0.18f, 1f);
        private static readonly Color Muted = new Color(0.62f, 0.68f, 0.82f);
        private static readonly Color Accent = new Color(0.20f, 0.42f, 0.78f, 1f);

        private readonly MetaService _meta;
        private readonly Action _onExit;
        private readonly Dictionary<string, CardCatalogItemDto> _catalog =
            new Dictionary<string, CardCatalogItemDto>(StringComparer.Ordinal);
        private bool _catalogLoading;

        private readonly RectTransform _root;
        private readonly RectTransform _board;
        private RectTransform _intents;
        private readonly Text _topInfo;
        private readonly Text _clock;
        private readonly Text _status;
        private readonly Button _concede;
        private readonly Text _concedeLabel;
        private readonly Button _reconnect;
        private readonly RectTransform _result;
        private RectTransform _logContent;
        private Text _resultText;
        private readonly List<string> _logLines = new List<string>();

        private GameConnection _connection;
        private CancellationTokenSource _cts;
        private MatchConnectionInfo _info;
        private MatchView _view;
        private bool _connecting;
        private bool _sending;
        private bool _snapshotPending;
        private bool _finished;
        private bool _confirmConcede;
        private bool _showAllIntents;
        private float _confirmDeadline;
        private long _clockServerMs;
        private long _clockReceivedMs;
        private readonly List<IntentPayload> _pendingIntents = new List<IntentPayload>();
        private readonly HashSet<string> _highlightKeys = new HashSet<string>(StringComparer.Ordinal);

        public BattleView(Transform parent, MetaService meta, Action onExit)
        {
            _meta = meta;
            _onExit = onExit;

            _root = UiKit.CreatePanel(parent, "BattleScreen", Background);

            var top = UiKit.CreatePanel(_root, "TopBar", Panel);
            top.anchorMin = new Vector2(0f, 1f);
            top.anchorMax = new Vector2(1f, 1f);
            top.pivot = new Vector2(0.5f, 1f);
            top.anchoredPosition = Vector2.zero;
            top.sizeDelta = new Vector2(0f, 88f);
            UiKit.AddHorizontalLayout(top, 20, 14);

            var title = UiKit.CreateText(top, "Title", "Бой", 32, Color.white, TextAnchor.MiddleLeft);
            title.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(title, 46f, 0f);

            _topInfo = UiKit.CreateText(
                top, "Match", string.Empty, 17, Muted, TextAnchor.MiddleLeft);
            UiKit.SetPreferredHeight(_topInfo, 38f);

            _clock = UiKit.CreateText(
                top, "Clock", "—", 22, Color.white, TextAnchor.MiddleRight);
            UiKit.SetPreferredHeight(_clock, 44f, 0f);

            _concede = UiKit.CreateButton(top, "Concede", "Сдаться", OnConcedeClicked, 18);
            _concedeLabel = _concede.GetComponentInChildren<Text>();
            UiKit.SetPreferredHeight(_concede, 44f, 0f);

            var left = UiKit.CreatePanel(_root, "BoardPanel", Background);
            left.anchorMin = Vector2.zero;
            left.anchorMax = Vector2.one;
            left.offsetMin = new Vector2(36f, 28f);
            left.offsetMax = new Vector2(-564f, -108f);
            UiKit.AddVerticalLayout(left, 8, 8);
            _board = left;

            var right = UiKit.CreatePanel(_root, "IntentPanel", Panel);
            right.anchorMin = new Vector2(1f, 0f);
            right.anchorMax = new Vector2(1f, 1f);
            right.pivot = new Vector2(1f, 0.5f);
            right.offsetMin = new Vector2(-528f, 28f);
            right.offsetMax = new Vector2(-36f, -108f);
            UiKit.AddVerticalLayout(right, 14, 10);

            var actionsTitle = UiKit.CreateText(
                right, "ActionsTitle", "Действия", 24, Color.white, TextAnchor.MiddleLeft);
            actionsTitle.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(actionsTitle, 32f);

            var scroll = UiKit.CreateScrollView(right, "IntentScroll", out _intents, 6f);
            var scrollElement = scroll.gameObject.AddComponent<LayoutElement>();
            scrollElement.flexibleHeight = 1f;
            scrollElement.minHeight = 200f;

            _status = UiKit.CreateText(
                right, "Status", string.Empty, 16, Muted, TextAnchor.UpperLeft);
            _status.horizontalOverflow = HorizontalWrapMode.Wrap;
            UiKit.SetPreferredHeight(_status, 74f);

            var logTitle = UiKit.CreateText(
                right, "LogTitle", "Журнал", 16, new Color(0.72f, 0.80f, 0.94f), TextAnchor.MiddleLeft);
            logTitle.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(logTitle, 22f);

            var logScroll = UiKit.CreateScrollView(right, "LogScroll", out _logContent, 3f);
            var logElement = logScroll.gameObject.AddComponent<LayoutElement>();
            logElement.preferredHeight = 142f;
            logElement.minHeight = 80f;

            _reconnect = UiKit.CreateButton(right, "Reconnect", "Переподключиться", OnReconnectClicked, 18);
            UiKit.SetPreferredHeight(_reconnect, 46f);
            _reconnect.gameObject.SetActive(false);

            _result = BuildResultPanel(_root);
            _result.gameObject.SetActive(false);

            _root.gameObject.SetActive(false);
        }

        public void Show(MatchConnectionInfo info)
        {
            _info = info;
            _view = null;
            _finished = false;
            _confirmConcede = false;
            _concedeLabel.text = "Сдаться";
            _concede.interactable = true;
            _reconnect.gameObject.SetActive(false);
            _result.gameObject.SetActive(false);
            _pendingIntents.Clear();
            _highlightKeys.Clear();
            _showAllIntents = false;
            _logLines.Clear();
            RebuildLog();
            _topInfo.text = (info.DeckName ?? string.Empty) + "   ·   " + info.MatchId;
            SetStatus("Подключаемся к матчу…", Muted);
            _root.gameObject.SetActive(true);
            _ = LoadCatalogAsync();
            _ = ConnectAsync();
        }

        public void Hide()
        {
            _cts?.Cancel();
            _cts?.Dispose();
            _cts = null;

            if (_connection != null)
            {
                var connection = _connection;
                _connection = null;
                _ = connection.DisposeAsync().AsTask();
            }

            _root.gameObject.SetActive(false);
            _result.gameObject.SetActive(false);
            _view = null;
        }

        public void Tick()
        {
            if (_confirmConcede && Time.unscaledTime > _confirmDeadline)
            {
                _confirmConcede = false;
                _concedeLabel.text = "Сдаться";
            }

            UpdateClock();
        }

        private RectTransform BuildResultPanel(Transform parent)
        {
            var overlay = UiKit.CreatePanel(parent, "BattleResult", new Color(0f, 0f, 0f, 0.75f));
            var card = UiKit.CreateCenteredCard(
                overlay, "ResultCard", new Vector2(640f, 330f),
                new Color(0.08f, 0.10f, 0.14f, 1f));
            UiKit.AddVerticalLayout(card, 32, 14);

            var title = UiKit.CreateText(card, "Title", "Матч завершён", 32, Color.white);
            title.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(title, 48f);

            _resultText = UiKit.CreateText(card, "Text", string.Empty, 22, Muted);
            UiKit.SetPreferredHeight(_resultText, 90f);

            var exit = UiKit.CreateButton(card, "Exit", "В меню", OnExitClicked, 21);
            UiKit.SetPreferredHeight(exit, 52f);

            return overlay;
        }

        private async Task LoadCatalogAsync()
        {
            if (_catalogLoading || _catalog.Count > 0)
                return;

            _catalogLoading = true;
            try
            {
                var items = await _meta.GetCatalogAsync();
                foreach (var item in items)
                    _catalog[item.PrintingId] = item;

                if (_root.gameObject.activeSelf && _view != null)
                    Render();
            }
            catch (Exception exception)
            {
                Debug.LogWarning("Battle catalog load failed: " + exception.Message);
            }
            finally
            {
                _catalogLoading = false;
            }
        }

        private async Task ConnectAsync()
        {
            if (_connecting || _info == null)
                return;

            _connecting = true;
            _reconnect.gameObject.SetActive(false);
            _cts?.Cancel();
            _cts?.Dispose();
            _cts = new CancellationTokenSource();

            try
            {
                if (_connection != null)
                {
                    await _connection.DisposeAsync();
                    _connection = null;
                }

                var connection = new GameConnection();
                _connection = connection;
                connection.HelloReceived += OnHello;
                connection.SnapshotReceived += OnSnapshot;
                connection.EventsReceived += OnEvents;
                connection.ClockReceived += OnClock;
                connection.ErrorReceived += OnError;
                connection.Closed += OnClosed;

                await connection.ConnectAsync(
                    _info.WsUrl,
                    _info.Ticket,
                    Application.version,
                    _view != null ? _view.EventSeq : 0,
                    _cts.Token);

                SetStatus("Соединение открыто. Ожидаем состояние…", Muted);
            }
            catch (OperationCanceledException)
            {
                // экран закрыли
            }
            catch (Exception exception)
            {
                Debug.LogException(exception);
                SetStatus("Не удалось подключиться: " + exception.Message, new Color(1f, 0.55f, 0.45f));
                _reconnect.gameObject.SetActive(true);
            }
            finally
            {
                _connecting = false;
            }
        }

        private void OnHello(ServerHello hello)
        {
            if (_info != null)
                _info.Seat = hello.PlayerIndex;
        }

        private void OnSnapshot(ServerSnapshot snapshot)
        {
            if (!_root.gameObject.activeSelf || snapshot?.View == null)
                return;

            _view = snapshot.View;
            _finished = _view.IsFinished;
            _pendingIntents.Clear();
            _highlightKeys.Clear();
            if (_view.Clock != null)
            {
                _clockServerMs = _view.Clock.ServerTimeMs;
                _clockReceivedMs = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
            }

            Render();
        }

        private void OnEvents(ServerEvents events)
        {
            if (events?.Events != null)
            {
                foreach (var envelope in events.Events)
                {
                    var line = Describe(envelope.Event);
                    if (!string.IsNullOrWhiteSpace(line))
                        _logLines.Add(line);
                }

                while (_logLines.Count > 40)
                    _logLines.RemoveAt(0);

                RebuildLog();
            }

            _ = RequestSnapshotAsync();
        }

        private void RebuildLog()
        {
            if (_logContent == null)
                return;

            ClearChildren(_logContent);
            var start = Mathf.Max(0, _logLines.Count - 8);
            for (var i = start; i < _logLines.Count; i++)
            {
                var line = UiKit.CreateText(
                    _logContent, "LogLine", _logLines[i], 13,
                    i == _logLines.Count - 1
                        ? new Color(0.92f, 0.94f, 1f)
                        : new Color(0.60f, 0.68f, 0.82f),
                    TextAnchor.MiddleLeft);
                line.horizontalOverflow = HorizontalWrapMode.Wrap;
                UiKit.SetPreferredHeight(line, 30f);
            }
        }

        private string Describe(EventView view)
        {
            if (view == null)
                return null;

            return view switch
            {
                UnitRodeView ride => "Ride: " + CardName(ride.PrintingId),
                UnitCalledView call => "Call: " + CardName(call.PrintingId) + " → " + SlotName(call.Slot),
                UnitMovedView move => "Move: " + SlotName(move.FromSlot) + " → " + SlotName(move.ToSlot),
                AttackDeclaredView attack => "Атака: " + SlotName(attack.AttackerSlot)
                    + " → " + SlotName(attack.TargetSlot),
                GuardAddedView guard => "Guard: " + CardName(guard.PrintingId)
                    + " (+" + guard.Shield + ")",
                PerfectGuardView perfect => "Perfect Guard: " + CardName(perfect.SentinelPrintingId),
                DriveCheckedView drive => "Drive: " + CardName(drive.PrintingId)
                    + " · " + drive.Trigger,
                TriggerResolvedView trigger => "Триггер: " + CardName(trigger.PrintingId),
                BattleResolvedView battle => battle.Hit ? "Атака прошла." : "Атака отбита.",
                DamageTakenView damage => "Урон: " + PlayerName(damage.Player)
                    + " +" + damage.Amount + " (всего " + damage.Total + ")",
                HealedView heal => "Heal: " + PlayerName(heal.Player),
                UnitRetiredView retire => "Retire: " + SlotName(retire.Slot),
                InterceptedView intercept => "Intercept: " + CardName(intercept.PrintingId),
                CardDrawnView draw => "Карта: " + PlayerName(draw.Player),
                PhaseChangedView phase => "Фаза: " + phase.Phase,
                GameFinishedView finish => "Партия завершена.",
                _ => null,
            };
        }

        private string PlayerName(int player) =>
            _view == null ? "P" + player : player == _view.You ? "Вы" : "Противник";

        private void OnClock(ServerClock clock)
        {
            if (!_root.gameObject.activeSelf || clock?.Clock == null)
                return;

            _clockServerMs = clock.Clock.ServerTimeMs;
            _clockReceivedMs = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();

            if (_view != null)
                _view.Clock = clock.Clock;

            UpdateClock();
        }

        private void OnError(ServerError error)
        {
            SetStatus(error.Code + ": " + error.Message, new Color(1f, 0.55f, 0.45f));
        }

        private void OnClosed(string reason)
        {
            if (!_root.gameObject.activeSelf || _finished)
                return;

            SetStatus("Соединение потеряно: " + reason, new Color(1f, 0.60f, 0.45f));
            _reconnect.gameObject.SetActive(true);
        }

        private async Task RequestSnapshotAsync()
        {
            if (_snapshotPending || _connection == null || !_connection.IsConnected)
                return;

            _snapshotPending = true;
            try
            {
                await _connection.RequestSnapshotAsync(_cts != null ? _cts.Token : CancellationToken.None);
            }
            catch (OperationCanceledException)
            {
                // экран закрыли
            }
            catch (Exception exception)
            {
                Debug.LogException(exception);
                SetStatus("Не удалось обновить состояние.", new Color(1f, 0.60f, 0.45f));
            }
            finally
            {
                _snapshotPending = false;
            }
        }

        private async void OnIntentClicked(IntentPayload intent)
        {
            if (_sending || _connection == null || _cts == null || _view == null)
                return;

            _pendingIntents.Clear();
            _highlightKeys.Clear();
            _sending = true;
            SetStatus("Отправляем: " + Label(intent), Muted);

            try
            {
                var result = await _connection.SubmitAsync(intent, _cts.Token);

                if (!result.Accepted)
                {
                    SetStatus(
                        "Отклонено (" + result.Code + "): " + (result.Reason ?? "без причины"),
                        new Color(1f, 0.55f, 0.45f));
                }
                else
                {
                    SetStatus(result.Duplicate ? "Повтор уже применён." : "Принято.", Muted);
                    await RequestSnapshotAsync();
                }
            }
            catch (OperationCanceledException)
            {
                // экран закрыли
            }
            catch (Exception exception)
            {
                Debug.LogException(exception);
                SetStatus("Ошибка отправки интента: " + exception.Message, new Color(1f, 0.55f, 0.45f));
            }
            finally
            {
                _sending = false;
            }
        }

        private void OnConcedeClicked()
        {
            if (_view == null || _finished)
                return;

            if (!_confirmConcede)
            {
                _confirmConcede = true;
                _confirmDeadline = Time.unscaledTime + 4f;
                _concedeLabel.text = "Подтвердить сдачу";
                SetStatus("Нажмите «Подтвердить сдачу» ещё раз.", new Color(1f, 0.76f, 0.38f));
                return;
            }

            _confirmConcede = false;
            _concedeLabel.text = "Сдаться";
            OnIntentClicked(new ConcedeIntent());
        }

        private async void OnReconnectClicked()
        {
            if (_info == null)
                return;

            _reconnect.interactable = false;
            SetStatus("Получаем новый тикет…", Muted);

            try
            {
                var ticket = await _meta.CreateTicketAsync(_info.MatchId);
                _info.Ticket = ticket.Ticket;
                _info.WsUrl = ticket.WsUrl;
                await ConnectAsync();
            }
            catch (ApiException exception)
            {
                SetStatus(exception.Message, new Color(1f, 0.55f, 0.45f));
            }
            catch (Exception exception)
            {
                Debug.LogException(exception);
                SetStatus("Переподключение не удалось.", new Color(1f, 0.55f, 0.45f));
            }
            finally
            {
                _reconnect.interactable = true;
            }
        }

        private void OnExitClicked()
        {
            Hide();
            _onExit();
        }

        private void Render()
        {
            if (_view == null)
                return;

            ClearChildren(_board);
            var opponentIndex = _view.You == 0 ? 1 : 0;
            var opponent = _view.Players.FirstOrDefault(player => player.Index == opponentIndex)
                ?? (_view.Players.Count > opponentIndex ? _view.Players[opponentIndex] : null);
            var self = _view.Players.FirstOrDefault(player => player.Index == _view.You)
                ?? (_view.Players.Count > _view.You ? _view.Players[_view.You] : null);

            AddFieldBlock(opponent, false);
            AddCenterPanel(_view);
            AddFieldBlock(self, true);
            AddHand(self);
            RebuildIntents(_view);
            UpdateClock();

            if (_view.IsFinished)
                ShowResult(_view);
        }

        private void AddFieldBlock(PlayerView player, bool self)
        {
            if (player == null)
                return;

            var block = UiKit.CreatePanel(
                _board,
                self ? "SelfField" : "OpponentField",
                new Color(0.05f, 0.07f, 0.11f, 0.96f));
            var blockElement = block.gameObject.AddComponent<LayoutElement>();
            blockElement.preferredHeight = self ? 214f : 204f;
            UiKit.AddVerticalLayout(block, 7, 3);

            var header = UiKit.CreateText(
                block,
                "Header",
                (self ? "ВЫ" : "ПРОТИВНИК") + "  ·  " + player.Name
                + "   рука " + player.HandCount
                + "  ·  колода " + player.DeckCount
                + "  ·  урон " + (player.FaceDownDamage + player.FaceUpDamage.Count)
                + "  ·  soul " + player.Soul.Count
                + "  ·  drop " + player.Drop.Count,
                15,
                self ? Color.white : new Color(0.94f, 0.82f, 0.70f),
                TextAnchor.MiddleLeft);
            header.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(header, 25f);

            var row = UiKit.CreatePanel(block, "Field", new Color(0f, 0f, 0f, 0f));
            var rowElement = row.gameObject.AddComponent<LayoutElement>();
            rowElement.flexibleHeight = 1f;
            rowElement.minHeight = 166f;
            UiKit.AddHorizontalLayout(row, 3, 7);

            AddCardBox(row, player.Vanguard, "V", compact: false, player.Index, -1);
            for (var i = 0; i < 5; i++)
            {
                var card = player.RearGuards != null && i < player.RearGuards.Length
                    ? player.RearGuards[i]
                    : null;
                AddCardBox(row, card, "R" + (i + 1), compact: false, player.Index, i);
            }
        }

        private void AddCenterPanel(MatchView view)
        {
            var panel = UiKit.CreatePanel(_board, "MatchInfo", new Color(0.06f, 0.09f, 0.15f, 0.98f));
            var element = panel.gameObject.AddComponent<LayoutElement>();
            element.preferredHeight = 76f;
            UiKit.AddVerticalLayout(panel, 8, 2);

            var active = view.ActivePlayer == view.You ? "решаете вы" : "решает противник";
            var main = UiKit.CreateText(
                panel,
                "Main",
                "Ход " + view.TurnNumber + "  ·  " + view.Phase + "  ·  " + view.Step
                + "  ·  " + active,
                17,
                view.ActivePlayer == view.You
                    ? new Color(0.55f, 0.86f, 1f)
                    : new Color(1f, 0.78f, 0.52f),
                TextAnchor.MiddleLeft);
            main.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(main, 26f);

            var details = new List<string>();
            if (view.Battle != null)
                details.Add("Бой: " + SlotName(view.Battle.AttackerSlot)
                    + " → " + SlotName(view.Battle.TargetSlot)
                    + " · щит " + view.Battle.GuardShield
                    + " · проверок " + view.Battle.ChecksRemaining);
            if (view.Choice != null)
                details.Add(view.Choice.Prompt);
            if (view.Ability != null)
                details.Add("Способность: " + CardName(view.Ability.PrintingId));
            if (view.Trigger != null)
                details.Add("Триггер: " + CardName(view.Trigger.PrintingId)
                    + " · " + view.Trigger.Trigger);
            if (view.OpponentChoosing)
                details.Add("Противник выбирает действие…");
            if (details.Count == 0)
                details.Add("Выберите действие в панели справа.");

            var detail = UiKit.CreateText(
                panel, "Detail", string.Join("   ·   ", details), 14,
                Muted, TextAnchor.MiddleLeft);
            detail.horizontalOverflow = HorizontalWrapMode.Wrap;
            UiKit.SetPreferredHeight(detail, 28f);
        }

        private void AddHand(PlayerView self)
        {
            var hand = UiKit.CreatePanel(_board, "HandBlock", new Color(0.05f, 0.07f, 0.11f, 0.96f));
            var handElement = hand.gameObject.AddComponent<LayoutElement>();
            handElement.preferredHeight = 188f;
            UiKit.AddVerticalLayout(hand, 6, 3);

            var header = UiKit.CreateText(
                hand, "Header",
                "РУКА  ·  " + (self?.Hand?.Count ?? 0) + " карт",
                16, Color.white, TextAnchor.MiddleLeft);
            header.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(header, 22f);

            var scroll = UiKit.CreateHorizontalScrollView(hand, "HandScroll", out var content, 6f);
            var scrollElement = scroll.gameObject.AddComponent<LayoutElement>();
            scrollElement.flexibleHeight = 1f;
            scrollElement.minHeight = 130f;

            if (self?.Hand == null || self.Hand.Count == 0)
            {
                var empty = UiKit.CreateText(
                    content, "Empty", "Рука пуста", 17, Muted);
                UiKit.SetPreferredHeight(empty, 110f);
                return;
            }

            foreach (var card in self.Hand)
                AddCardBox(content, card, "Рука", compact: true, self.Index, -2);
        }

        private void AddInfoLine(Transform parent, string text)
        {
            var line = UiKit.CreateText(
                parent, "Info", text, 16, Muted, TextAnchor.MiddleLeft);
            UiKit.SetPreferredHeight(line, 22f);
        }

        private void AddCardBox(
            Transform parent,
            CardView card,
            string slot,
            bool compact,
            int playerIndex,
            int slotIndex)
        {
            var meta = card != null && _catalog.TryGetValue(card.PrintingId, out var found)
                ? found
                : null;
            var clanColor = CardArt.ClanColor(meta != null ? meta.Clan : "None");
            var frameColor = card == null
                ? new Color(0.16f, 0.18f, 0.24f)
                : CardArt.ClanColor(meta != null ? meta.Clan : "None");

            var panel = UiKit.CreatePanel(
                parent, "Card_" + slot, card == null
                    ? new Color(0.06f, 0.08f, 0.12f, 0.9f)
                    : card.FaceUp
                        ? new Color(0.09f, 0.11f, 0.16f, 1f)
                        : new Color(0.05f, 0.08f, 0.14f, 1f));
            var element = panel.gameObject.AddComponent<LayoutElement>();
            element.preferredWidth = compact ? 106f : 124f;
            element.preferredHeight = compact ? 142f : 162f;
            element.flexibleWidth = 0f;

            var highlighted = _highlightKeys.Contains(
                TargetKey(playerIndex, slotIndex, card != null ? card.PrintingId : null));
            var button = panel.gameObject.AddComponent<Button>();
            button.targetGraphic = panel.GetComponent<Image>();
            button.onClick.AddListener(() => OnBoardTargetClicked(new BoardTarget(
                playerIndex, slotIndex, card != null ? card.PrintingId : null,
                card != null ? card.InstanceId : 0, slotIndex == -2)));

            var outline = panel.gameObject.AddComponent<Outline>();
            outline.effectColor = highlighted ? new Color(1f, 0.82f, 0.28f) : frameColor;
            outline.effectDistance = highlighted
                ? new Vector2(3f, -3f)
                : new Vector2(2f, -2f);
            UiKit.AddVerticalLayout(panel, 4, 2);

            var slotText = UiKit.CreateText(
                panel, "Slot", slot, 10,
                new Color(0.58f, 0.66f, 0.80f), TextAnchor.MiddleLeft);
            UiKit.SetPreferredHeight(slotText, 14f);

            if (card == null)
            {
                var emptyArt = UiKit.CreatePanel(panel, "EmptyArt", new Color(0.04f, 0.06f, 0.09f, 1f));
                UiKit.SetPreferredHeight(emptyArt, compact ? 48f : 64f);
                var empty = UiKit.CreateText(
                    emptyArt, "Empty", "—", 22,
                    new Color(1f, 1f, 1f, 0.18f));
                UiKit.Stretch(empty.rectTransform);
                var emptyLabel = UiKit.CreateText(
                    panel, "EmptyLabel", "Пусто", 11,
                    new Color(1f, 1f, 1f, 0.28f));
                UiKit.SetPreferredHeight(emptyLabel, 24f);
                return;
            }

            var art = UiKit.CreatePanel(panel, "Art", Color.white);
            UiKit.SetPreferredHeight(art, compact ? 48f : 64f);
            var artImage = art.GetComponent<Image>();
            artImage.sprite = card.FaceUp
                ? CardArt.ForCard(
                    meta != null ? meta.NameId : card.PrintingId,
                    meta != null ? meta.Clan : "None")
                : CardArt.Back;
            artImage.color = Color.white;
            artImage.preserveAspect = false;

            if (card.FaceUp)
            {
                var artName = UiKit.CreateText(
                    art, "ArtName", meta != null ? meta.NameEn : card.PrintingId, 10,
                    new Color(1f, 1f, 1f, 0.94f), TextAnchor.MiddleCenter);
                UiKit.Stretch(artName.rectTransform);
                artName.rectTransform.offsetMin = new Vector2(3f, 3f);
                artName.rectTransform.offsetMax = new Vector2(-3f, -2f);
                artName.horizontalOverflow = HorizontalWrapMode.Wrap;

                if (meta != null)
                {
                    var grade = UiKit.CreateText(
                        art, "Grade", "G" + meta.Grade, 10,
                        Color.white, TextAnchor.MiddleCenter);
                    var gradeRect = grade.rectTransform;
                    gradeRect.anchorMin = new Vector2(1f, 1f);
                    gradeRect.anchorMax = new Vector2(1f, 1f);
                    gradeRect.pivot = new Vector2(1f, 1f);
                    gradeRect.anchoredPosition = new Vector2(-3f, -3f);
                    gradeRect.sizeDelta = new Vector2(25f, 16f);
                }
            }
            else
            {
                var hidden = UiKit.CreateText(
                    art, "Hidden", "?", 26, new Color(1f, 1f, 1f, 0.8f));
                UiKit.Stretch(hidden.rectTransform);
            }

            if (card.Rested)
            {
                var rested = UiKit.CreateText(
                    art, "Rested", "REST", 10,
                    new Color(1f, 0.55f, 0.35f), TextAnchor.MiddleCenter);
                var restedRect = rested.rectTransform;
                restedRect.anchorMin = new Vector2(0f, 0f);
                restedRect.anchorMax = new Vector2(0f, 0f);
                restedRect.pivot = new Vector2(0f, 0f);
                restedRect.anchoredPosition = new Vector2(3f, 3f);
                restedRect.sizeDelta = new Vector2(34f, 16f);
            }

            var name = UiKit.CreateText(
                panel, "Name",
                meta != null ? meta.NameEn : card.PrintingId,
                10,
                card.FaceUp ? Color.white : Muted,
                TextAnchor.UpperLeft);
            name.horizontalOverflow = HorizontalWrapMode.Wrap;
            name.fontStyle = FontStyle.Bold;
            UiKit.SetPreferredHeight(name, compact ? 26f : 28f);

            var stats = UiKit.CreateText(
                panel, "Stats",
                card.FaceUp
                    ? "P " + card.Power + "  ·  C " + card.Critical
                    + (meta != null ? "  ·  " + TriggerShort(meta.Trigger) : string.Empty)
                    : "СКРЫТА",
                11,
                card.FaceUp && card.Power != card.BasePower
                    ? new Color(1f, 0.82f, 0.42f)
                    : new Color(0.72f, 0.78f, 0.92f),
                TextAnchor.MiddleLeft);
            UiKit.SetPreferredHeight(stats, 18f);
        }

        private static string TriggerShort(string trigger) => trigger switch
        {
            "Critical" => "K",
            "Draw" => "D",
            "Stand" => "S",
            "Heal" => "H",
            _ => "—",
        };

        private string CardName(string printingId) =>
            _catalog.TryGetValue(printingId, out var meta) ? meta.NameEn : printingId;

        private void OnBoardTargetClicked(BoardTarget target)
        {
            if (_view == null || _sending)
                return;

            var legal = _view.LegalIntents ?? new List<IntentPayload>();

            if (_pendingIntents.Count > 0)
            {
                var matches = _pendingIntents
                    .Where(intent => TryGetTarget(intent, out var candidate) && candidate.Matches(target))
                    .OrderBy(intent => intent is AttackIntent attack && attack.BoosterSlot >= 0 ? 1 : 0)
                    .ToList();

                if (matches.Count > 0)
                {
                    ClearSelection(rebuild: false);
                    OnIntentClicked(matches[0]);
                    return;
                }
            }

            var sources = legal
                .Where(intent => TryGetSource(intent, out var source) && source.Matches(target))
                .ToList();

            if (sources.Count == 0)
            {
                SetStatus("Для этой карты сейчас нет доступного действия.", Muted);
                return;
            }

            if (sources.Count == 1)
            {
                ClearSelection(rebuild: false);
                OnIntentClicked(sources[0]);
                return;
            }

            var withTargets = sources
                .Where(intent => TryGetTarget(intent, out _))
                .ToList();

            if (withTargets.Count == 0)
            {
                ClearSelection(rebuild: false);
                OnIntentClicked(sources[0]);
                return;
            }

            _pendingIntents.Clear();
            _pendingIntents.AddRange(withTargets);
            RebuildHighlights();
            RebuildIntents(_view);
            SetStatus("Выберите цель на поле.", new Color(0.98f, 0.82f, 0.42f));
        }

        private void ClearSelection(bool rebuild = true)
        {
            _pendingIntents.Clear();
            _highlightKeys.Clear();
            if (rebuild && _view != null)
                RebuildIntents(_view);
        }

        private void RebuildHighlights()
        {
            _highlightKeys.Clear();
            foreach (var intent in _pendingIntents)
            {
                if (TryGetTarget(intent, out var target))
                    _highlightKeys.Add(TargetKey(target.Player, target.Slot, target.PrintingId));
            }
        }

        private bool TryGetSource(IntentPayload intent, out BoardTarget source)
        {
            source = default;
            if (_view == null)
                return false;

            switch (intent)
            {
                case RideIntent ride:
                    source = new BoardTarget(_view.You, -2, ride.PrintingId, 0, true);
                    return true;
                case CallIntent call:
                    source = new BoardTarget(_view.You, -2, call.PrintingId, 0, true);
                    return true;
                case GuardIntent guard:
                    source = new BoardTarget(_view.You, -2, guard.PrintingId, 0, true);
                    return true;
                case MoveIntent move:
                    source = FieldTarget(_view.You, move.FromSlot);
                    return true;
                case AttackIntent attack:
                    source = FieldTarget(_view.You, attack.AttackerSlot);
                    return true;
                case InterceptIntent intercept:
                    source = FieldTarget(_view.You, intercept.Slot);
                    return true;
                case ActivateAbilityIntent activate:
                    source = InstanceTarget(_view.You, activate.InstanceId);
                    return source.InstanceId != 0;
                default:
                    return false;
            }
        }

        private bool TryGetTarget(IntentPayload intent, out BoardTarget target)
        {
            target = default;
            if (_view == null)
                return false;

            switch (intent)
            {
                case CallIntent call:
                    target = FieldTarget(_view.You, call.Slot);
                    return true;
                case MoveIntent move:
                    target = FieldTarget(_view.You, move.ToSlot);
                    return true;
                case AttackIntent attack:
                    target = FieldTarget(1 - _view.You, attack.TargetSlot);
                    return true;
                default:
                    return false;
            }
        }

        private BoardTarget FieldTarget(int player, int slot)
        {
            var card = CardAt(player, slot);
            return new BoardTarget(player, slot, card != null ? card.PrintingId : null,
                card != null ? card.InstanceId : 0, false);
        }

        private BoardTarget InstanceTarget(int player, int instanceId)
        {
            var card = InstanceAt(player, instanceId);
            if (card == null)
                return default;

            if (_view != null
                && _view.Players.FirstOrDefault(item => item.Index == player)?.Vanguard is { } vanguard
                && vanguard.InstanceId == instanceId)
            {
                return new BoardTarget(player, -1, card.PrintingId, instanceId, false);
            }

            var field = _view?.Players.FirstOrDefault(item => item.Index == player);
            if (field?.RearGuards != null)
            {
                for (var i = 0; i < field.RearGuards.Length; i++)
                {
                    if (field.RearGuards[i]?.InstanceId == instanceId)
                        return new BoardTarget(player, i, card.PrintingId, instanceId, false);
                }
            }

            return default;
        }

        private CardView CardAt(int player, int slot)
        {
            var side = _view?.Players.FirstOrDefault(item => item.Index == player);
            if (side == null)
                return null;

            if (slot == -1)
                return side.Vanguard;

            return side.RearGuards != null && slot >= 0 && slot < side.RearGuards.Length
                ? side.RearGuards[slot]
                : null;
        }

        private CardView InstanceAt(int player, int instanceId)
        {
            var side = _view?.Players.FirstOrDefault(item => item.Index == player);
            if (side == null)
                return null;

            if (side.Vanguard?.InstanceId == instanceId)
                return side.Vanguard;

            return side.RearGuards?.FirstOrDefault(card => card?.InstanceId == instanceId);
        }

        private static string TargetKey(int player, int slot, string printingId) =>
            player + ":" + slot + ":" + (printingId ?? string.Empty);

        private static bool IsBoardIntent(IntentPayload intent) =>
            intent is RideIntent or CallIntent or MoveIntent or AttackIntent
                or GuardIntent or InterceptIntent or ActivateAbilityIntent;

        private void RebuildIntents(MatchView view)
        {
            ClearChildren(_intents);

            var legal = view.LegalIntents ?? new List<IntentPayload>();
            var playable = legal.Where(intent => intent is not ConcedeIntent).ToList();
            var board = playable.Where(IsBoardIntent).ToList();
            var global = playable.Where(intent => !IsBoardIntent(intent)).ToList();

            if (_pendingIntents.Count > 0)
            {
                var prompt = UiKit.CreateText(
                    _intents,
                    "TargetPrompt",
                    "Выберите цель на поле.\nНажмите «Отмена», чтобы снять выбор.",
                    16,
                    new Color(0.98f, 0.82f, 0.42f),
                    TextAnchor.UpperLeft);
                prompt.horizontalOverflow = HorizontalWrapMode.Wrap;
                UiKit.SetPreferredHeight(prompt, 64f);

                var cancel = UiKit.CreateButton(
                    _intents, "CancelTarget", "Отмена", () =>
                    {
                        ClearSelection();
                        Render();
                    }, 17);
                UiKit.SetPreferredHeight(cancel, 44f);
                return;
            }

            if (playable.Count == 0)
            {
                var waiting = UiKit.CreateText(
                    _intents,
                    "Waiting",
                    view.IsFinished ? "Матч завершён." : "Сейчас решает противник…",
                    18,
                    Muted);
                UiKit.SetPreferredHeight(waiting, 110f);
                return;
            }

            if (board.Count > 0)
            {
                var hint = UiKit.CreateText(
                    _intents,
                    "BoardHint",
                    "Нажмите на карту в руке или на поле.\nДопустимые цели подсветятся.",
                    15,
                    new Color(0.72f, 0.80f, 0.94f),
                    TextAnchor.UpperLeft);
                hint.horizontalOverflow = HorizontalWrapMode.Wrap;
                UiKit.SetPreferredHeight(hint, 52f);

                var toggle = UiKit.CreateButton(
                    _intents,
                    "ToggleAllIntents",
                    _showAllIntents ? "Скрыть все действия" : "Показать все действия",
                    () =>
                    {
                        _showAllIntents = !_showAllIntents;
                        RebuildIntents(_view);
                    },
                    15);
                UiKit.SetPreferredHeight(toggle, 38f);
            }

            foreach (var intent in global)
                AddIntentButton(intent);

            if (_showAllIntents)
            {
                foreach (var intent in board)
                    AddIntentButton(intent);
            }
        }

        private void AddIntentButton(IntentPayload intent)
        {
            var captured = intent;
            var button = UiKit.CreateButton(
                _intents,
                "Intent_" + captured.GetType().Name,
                Label(captured),
                () => OnIntentClicked(captured),
                16);
            UiKit.SetPreferredHeight(button, 46f);
        }

        private void ShowResult(MatchView view)
        {
            if (_result.gameObject.activeSelf)
                return;

            _result.SetAsLastSibling();
            _result.gameObject.SetActive(true);
            _concede.interactable = false;

            _resultText.text = view.Winner < 0
                ? "Ничья или матч прерван."
                : view.Winner == view.You
                    ? "Победа!"
                    : "Поражение.";

            _resultText.text += "\nМатч " + view.MatchId + " завершён.";
        }

        private void UpdateClock()
        {
            if (_view?.Clock == null || !_view.Clock.IsRunning)
            {
                _clock.text = "—";
                return;
            }

            var localNow = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
            var serverNow = _clockServerMs + (localNow - _clockReceivedMs);
            var remaining = Math.Max(0, _view.Clock.TurnDeadlineMs - serverNow);
            var bank = _view.Clock.DecisionPlayer == _view.You
                ? _view.Clock.Bank0Ms
                : _view.Clock.Bank1Ms;

            _clock.text = Format(remaining) + "   ·   банк " + Format(bank);
        }

        private static string Format(long milliseconds)
        {
            var totalSeconds = Math.Max(0, milliseconds / 1000);
            var minutes = totalSeconds / 60;
            var seconds = totalSeconds % 60;
            return minutes.ToString("00") + ":" + seconds.ToString("00");
        }

        private static void ClearChildren(Transform parent)
        {
            for (var i = parent.childCount - 1; i >= 0; i--)
            {
                var child = parent.GetChild(i).gameObject;
                if (Application.isPlaying)
                    UnityEngine.Object.Destroy(child);
                else
                    UnityEngine.Object.DestroyImmediate(child);
            }
        }

        private static string SlotName(int slot)
        {
            if (slot < 0)
                return "Vanguard";

            return "R" + (slot + 1);
        }

        private string Label(IntentPayload intent)
        {
            switch (intent)
            {
                case FinishMulliganIntent _: return "Закончить маллиган";
                case MulliganIntent mulligan: return "Маллиган: " + mulligan.HandIndexes.Count + " карт";
                case SkipRideIntent _: return "Пропустить Ride";
                case RideIntent ride: return "Ride: " + CardName(ride.PrintingId);
                case CallIntent call: return "Call " + CardName(call.PrintingId) + " → " + SlotName(call.Slot);
                case MoveIntent move: return "Move " + SlotName(move.FromSlot) + " → " + SlotName(move.ToSlot);
                case EnterBattleIntent _: return "В фазу боя";
                case AttackIntent attack:
                    return "Атака " + SlotName(attack.AttackerSlot) + " → " + SlotName(attack.TargetSlot)
                        + (attack.BoosterSlot >= 0 ? " + boost" : string.Empty);
                case GuardIntent guard: return "Guard: " + CardName(guard.PrintingId);
                case InterceptIntent intercept: return "Intercept: " + SlotName(intercept.Slot);
                case PassGuardIntent _: return "Пропустить Guard";
                case ResolveTriggerIntent trigger:
                    return "Триггер: сила " + SlotName(trigger.PowerTarget)
                        + ", эффект " + SlotName(trigger.EffectTarget);
                case SelectTriggerIntent select: return "Выбрать триггер #" + select.Index;
                case ResolveAbilityIntent ability:
                    return ability.Accept ? "Применить способность" : "Пропустить способность";
                case ChooseIntent choose: return ChoiceLabel(choose.Index);
                case ActivateAbilityIntent activate:
                    return "Способность #" + activate.InstanceId;
                case EndTurnIntent _: return "Закончить ход";
                case ConcedeIntent _: return "Сдаться";
                default: return intent.GetType().Name;
            }
        }

        private string ChoiceLabel(int index)
        {
            if (_view?.Choice?.Options != null
                && index >= 0
                && index < _view.Choice.Options.Count)
            {
                return "Выбрать: " + _view.Choice.Options[index].Label;
            }

            return "Выбрать вариант #" + index;
        }

        private void SetStatus(string text, Color color)
        {
            _status.text = text ?? string.Empty;
            _status.color = color;
        }

        private readonly struct BoardTarget
        {
            public BoardTarget(
                int player,
                int slot,
                string printingId,
                int instanceId,
                bool isHand)
            {
                Player = player;
                Slot = slot;
                PrintingId = printingId;
                InstanceId = instanceId;
                IsHand = isHand;
            }

            public int Player { get; }
            public int Slot { get; }
            public string PrintingId { get; }
            public int InstanceId { get; }
            public bool IsHand { get; }

            public bool Matches(BoardTarget other)
            {
                if (IsHand || other.IsHand)
                {
                    return IsHand && other.IsHand
                        && Player == other.Player
                        && string.Equals(PrintingId, other.PrintingId, StringComparison.Ordinal);
                }

                return Player == other.Player && Slot == other.Slot;
            }
        }
    }
}