// <copyright file="HeykelSavasiContext.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.GameLogic.MiniGames;

using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MUnique.OpenMU.DataModel;
using MUnique.OpenMU.DataModel.Configuration;
using MUnique.OpenMU.GameLogic.Attributes;
using MUnique.OpenMU.GameLogic.NPC;
using MUnique.OpenMU.GameLogic.PlayerActions.MiniGames;
using MUnique.OpenMU.GameLogic.Views.MiniGames;
using MUnique.OpenMU.Pathfinding;

/// <summary>
/// The context of the Heykel Savasi (statue war) event.
/// </summary>
/// <remarks>
/// This is the foundation class for the event: it tracks which team every participating player
/// belongs to, and enforces a team-balance rule when players attempt to join a team.
/// </remarks>
public class HeykelSavasiContext : MiniGameContext
{
    /// <summary>
    /// The maximum allowed difference between the red and blue team sizes after a join.
    /// </summary>
    private const int MaxTeamDifference = 2;

    /// <summary>
    /// The X1/Y1 anchor of the red team's base spawn gate.
    /// Must match Gates.cs targetGates 600 (RedBase).
    /// </summary>
    private const byte RedBaseAnchorX1 = 42;

    /// <summary>
    /// The X1/Y1 anchor of the red team's base spawn gate.
    /// Must match Gates.cs targetGates 600 (RedBase).
    /// </summary>
    private const byte RedBaseAnchorY1 = 10;

    /// <summary>
    /// The X1/Y1 anchor of the blue team's base spawn gate.
    /// Must match Gates.cs targetGates 601 (BlueBase).
    /// </summary>
    private const byte BlueBaseAnchorX1 = 42;

    /// <summary>
    /// The X1/Y1 anchor of the blue team's base spawn gate.
    /// Must match Gates.cs targetGates 601 (BlueBase).
    /// </summary>
    private const byte BlueBaseAnchorY1 = 92;

    /// <summary>
    /// The number of statues (per team) which need to be broken by the opposing team to win the event.
    /// </summary>
    public const int StatuesToBreak = 7;

    /// <summary>
    /// The fixed amount of Zen awarded to each member of the winning team when the event ends.
    /// </summary>
    /// <remarks>
    /// This is the authoritative definition of the reward amount. It is defined here (in GameLogic), not in
    /// <c>Persistence.Initialization.VersionSeasonSix.Events.HeykelSavasiInitializer</c> where a same-named
    /// constant currently also exists, because <c>MUnique.OpenMU.GameLogic</c> does not - and must not -
    /// reference <c>MUnique.OpenMU.Persistence.Initialization</c> (the dependency only goes the other way;
    /// same constraint that forced <see cref="StatuePositions"/> into this class). The initializer's constant
    /// is unused by this class and will be reconciled/removed in a later cleanup pass.
    /// </remarks>
    public const int WinnerZenReward = 10_000_000;

    /// <summary>
    /// The <see cref="MUnique.OpenMU.DataModel.Configuration.MonsterDefinition.Number"/> of the destructible
    /// statue NPC (see <c>HeykelSavasiMap.CreateMonsters</c>).
    /// </summary>
    private const short StatueMonsterNumber = 561;

    /// <summary>
    /// The <see cref="MUnique.OpenMU.DataModel.Configuration.MonsterDefinition.Number"/> of the guard NPC
    /// which spawns around each statue (see <c>HeykelSavasiMap.CreateMonsters</c>).
    /// </summary>
    private const short GuardMonsterNumber = 580;

    /// <summary>
    /// The (dx, dy) offsets, relative to a statue's position, at which its 3 guards spawn. A statue
    /// cannot be damaged until all 3 of these guards are dead (see <see cref="IsStatueAttackBlocked"/>).
    /// </summary>
    private static readonly (int Dx, int Dy)[] GuardOffsets = { (-2, 0), (2, 0), (0, 2) };

    /// <summary>
    /// The number of guard mobs which spawn next to (and protect) each statue.
    /// </summary>
    private const int GuardsPerStatue = 3;

    /// <summary>
    /// Maps a destroyed statue's index (0..5) to the <see cref="MUnique.OpenMU.DataModel.Configuration.MagicEffectDefinition.Number"/>
    /// of the class buff granted to the whole attacking team. All of these effects already exist in
    /// configuration (no custom <c>MagicEffectDefinition</c>s were added): 1=GreaterDamage, 2=GreaterDefense,
    /// 4=SoulBarrier, 5=CriticalDamageIncrease (DL), 0x52=WizEnhance (SM), 129=IgnoreDefense (RF).
    /// Index 6 (the 7th/final statue) intentionally has no entry - breaking it is the win condition, not a
    /// buff trigger; see the bounds check in <see cref="ApplyStatueBuffToTeamAsync"/>.
    /// </summary>
    private static readonly short[] StatueBuffEffectNumbers = { 1, 2, 4, 5, 0x52, 129 };

    /// <summary>
    /// The duration of the class buff granted on a statue break, chosen to comfortably outlast a single
    /// match (matches run longer than 5 minutes).
    /// </summary>
    private static readonly TimeSpan BuffDuration = TimeSpan.FromMinutes(6);

    /// <summary>
    /// The FIXED positions of the red team's 7 statues (attacked by the blue team). All 7 are spawned and
    /// visible at battle start and can be broken in ANY order; the index (0..6) is retained only for the
    /// per-break buff mapping (see <see cref="StatueBuffEffectNumbers"/>), not for spawn sequencing.
    /// </summary>
    private static readonly Point[] RedStatuePositions =
    {
        new(43, 20),
        new(56, 26),
        new(72, 43),
        new(43, 28),
        new(43, 44),
        new(29, 26),
        new(14, 43),
    };

    /// <summary>
    /// The FIXED positions of the blue team's 7 statues (attacked by the red team). All 7 are spawned and
    /// visible at battle start and can be broken in ANY order; the index (0..6) is retained only for the
    /// per-break buff mapping (see <see cref="StatueBuffEffectNumbers"/>), not for spawn sequencing.
    /// </summary>
    private static readonly Point[] BlueStatuePositions =
    {
        new(16, 61),
        new(31, 77),
        new(43, 72),
        new(43, 58),
        new(72, 60),
        new(57, 76),
        new(43, 82),
    };

    /// <summary>
    /// The duration of the preparation countdown between the entrance closing (<see cref="MiniGameState.Closed"/>)
    /// and the battle starting (<see cref="MiniGameState.Playing"/>). Mirrors the hard-coded
    /// <c>countdownMessageDuration</c> in <see cref="MiniGameContext"/>'s own game loop (MiniGameContext.cs:709),
    /// which isn't exposed to subclasses, so the HUD countdown re-declares the same constant here.
    /// </summary>
    private static readonly TimeSpan PreparationDuration = TimeSpan.FromSeconds(30);

    private readonly IGameContext _gameContext;
    private readonly IMapInitializer _mapInitializer;

    private readonly ConcurrentDictionary<Player, HeykelSavasiTeam> _teams = new();

    /// <summary>
    /// UTC timestamp of when this context was constructed, used as the start reference for estimating the
    /// remaining time of the registration phase (<see cref="MiniGameState.Open"/>) in the periodic HUD broadcast
    /// (see <see cref="ComputeHudPhaseAndRemaining"/>).
    /// </summary>
    private readonly DateTime _createdAtUtc = DateTime.UtcNow;

    /// <summary>
    /// UTC timestamp of the first observed transition into <see cref="MiniGameState.Closed"/> (entrance closed,
    /// preparation countdown running), lazily set by <see cref="ComputeHudPhaseAndRemaining"/>.
    /// </summary>
    private DateTime? _closedAtUtc;

    /// <summary>
    /// UTC timestamp of the first observed transition into <see cref="MiniGameState.Playing"/> (battle started),
    /// lazily set by <see cref="ComputeHudPhaseAndRemaining"/>.
    /// </summary>
    private DateTime? _playingAtUtc;

    /// <summary>
    /// Maps a currently-alive, spawned statue NPC to the team it defends and its index (0..6) in that
    /// team's statue line. Populated by <see cref="SpawnStatueAsync"/>, consumed (and removed) by
    /// <see cref="OnDestructibleDied"/> once the statue is destroyed.
    /// </summary>
    private readonly ConcurrentDictionary<AttackableNpcBase, (HeykelSavasiTeam Defender, int Index)> _statues = new();

    /// <summary>
    /// Maps each spawned statue NPC to the number of its guard mobs which are still alive. A statue starts at
    /// <see cref="GuardsPerStatue"/> and can only be damaged once this reaches 0 (see
    /// <see cref="IsStatueAttackBlocked"/>); decremented by <see cref="OnMonsterDied"/> as guards die.
    /// </summary>
    private readonly ConcurrentDictionary<AttackableNpcBase, int> _statueGuardsAlive = new();

    /// <summary>
    /// Maps each spawned guard mob to the statue it protects, so <see cref="OnMonsterDied"/> can decrement the
    /// right statue's living-guard count when a guard dies. The guard is removed once its death is processed.
    /// </summary>
    private readonly ConcurrentDictionary<AttackableNpcBase, AttackableNpcBase> _guardToStatue = new();

    /// <summary>
    /// Pure statue-break progress/winner state, extracted into its own dependency-free type so it can be
    /// unit-tested without constructing a full <see cref="HeykelSavasiContext"/> (whose constructor needs a
    /// live <see cref="IGameContext"/> and starts a background game loop via <c>Task.Run</c>).
    /// </summary>
    private readonly StatueProgressState _progress = new();

    /// <summary>
    /// Synchronizes the check-then-act sequence of <see cref="TryJoinTeamAsync"/>, so that concurrent
    /// join attempts cannot both pass the balance check before either of them reserves a slot.
    /// </summary>
    private readonly object _teamLock = new();

    /// <summary>
    /// Initializes a new instance of the <see cref="HeykelSavasiContext"/> class.
    /// </summary>
    /// <param name="key">The key of this context.</param>
    /// <param name="definition">The definition of the mini game.</param>
    /// <param name="gameContext">The game context, to which this game belongs.</param>
    /// <param name="mapInitializer">The map initializer, which is used when the event starts.</param>
    public HeykelSavasiContext(MiniGameMapKey key, MiniGameDefinition definition, IGameContext gameContext, IMapInitializer mapInitializer)
        : base(key, definition, gameContext, mapInitializer)
    {
        this._gameContext = gameContext;
        this._mapInitializer = mapInitializer;

        _ = Task.Run(() => this.HudBroadcastLoopAsync(this.GameEndedToken), this.GameEndedToken);
    }

    /// <summary>
    /// Gets a value indicating whether players are allowed to kill each other.
    /// </summary>
    /// <remarks>
    /// This does not prevent friendly fire (team members killing each other); that restriction
    /// is added separately via a <see cref="Player"/> hook in a later phase.
    /// </remarks>
    public override bool AllowPlayerKilling => this.State == MiniGameState.Playing;

    /// <summary>
    /// Gets the current number of players assigned to the given team.
    /// </summary>
    /// <param name="team">The team.</param>
    /// <returns>The number of players currently assigned to <paramref name="team"/>.</returns>
    public int TeamCount(HeykelSavasiTeam team) => this._teams.Values.Count(t => t == team);

    /// <summary>
    /// Determines whether a player may currently join the given team, based on the team-balance rule.
    /// </summary>
    /// <param name="team">The team which a player wants to join.</param>
    /// <returns><c>true</c> if the join is allowed; otherwise, <c>false</c>.</returns>
    public bool CanJoin(HeykelSavasiTeam team) => IsJoinAllowed(this.TeamCount(HeykelSavasiTeam.Red), this.TeamCount(HeykelSavasiTeam.Blue), team);

    /// <summary>
    /// Assigns the given player to the given team.
    /// </summary>
    /// <param name="player">The player.</param>
    /// <param name="team">The team.</param>
    public void AssignTeam(Player player, HeykelSavasiTeam team) => this._teams[player] = team;

    /// <summary>
    /// Gets the team of the given player.
    /// </summary>
    /// <param name="player">The player.</param>
    /// <returns>The team of the player, or <see cref="HeykelSavasiTeam.None"/> if the player is not assigned to a team.</returns>
    public HeykelSavasiTeam GetTeam(Player player) => this._teams.TryGetValue(player, out var team) ? team : HeykelSavasiTeam.None;

    /// <summary>
    /// Returns <c>true</c> if a hit on <paramref name="npc"/> by <paramref name="attacker"/> must be blocked.
    /// A statue is protected (undamageable) while EITHER it belongs to the attacker's own team (a player may
    /// never break their own team's statue and credit the enemy) OR any of its 3 guard mobs are still alive
    /// (the guards must be cleared first). If <paramref name="npc"/> is not a tracked statue, the hit is never
    /// blocked here (normal damage). Called from <c>AttackableNpcBase.AttackByAsync</c>.
    /// </summary>
    /// <param name="npc">The NPC being attacked.</param>
    /// <param name="attacker">The attacking player.</param>
    /// <returns><c>true</c> if the hit should be blocked; otherwise, <c>false</c>.</returns>
    public bool IsStatueAttackBlocked(AttackableNpcBase npc, Player attacker)
    {
        if (!this._statues.TryGetValue(npc, out var info))
        {
            return false;
        }

        if (info.Defender == this.GetTeam(attacker))
        {
            return true;
        }

        return this._statueGuardsAlive.TryGetValue(npc, out var aliveGuards) && aliveGuards > 0;
    }

    /// <summary>
    /// Gets the base spawn gate for the given team.
    /// </summary>
    /// <param name="team">The team.</param>
    /// <returns>The <see cref="ExitGate"/> which is the base spawn point of <paramref name="team"/>.</returns>
    /// <remarks>
    /// The gate is resolved by matching the X1/Y1 anchor of the gates created for this event's map
    /// (see Gates.cs targetGates 600/601, added in Task 0.3). Red anchors at (20, 20), Blue at (220, 220).
    /// </remarks>
    public ExitGate GetTeamSpawnGate(HeykelSavasiTeam team)
    {
        // Robust selection: the map has exactly two spawn gates (one per base). The red base sits at
        // the top of the arena (smaller Y), the blue base at the bottom (larger Y). Selecting by Y-order
        // avoids brittle exact-coordinate matching (gate coords can drift by a tile between data paths).
        var spawnGates = this.Definition.Entrance!.Map!.ExitGates
            .Where(g => g.IsSpawnGate)
            .OrderBy(g => g.Y1)
            .ToList();
        if (spawnGates.Count == 0)
        {
            return this.Definition.Entrance!;
        }

        return team == HeykelSavasiTeam.Blue ? spawnGates[^1] : spawnGates[0];
    }

    /// <summary>
    /// Gets all players which are currently assigned to the given team.
    /// </summary>
    /// <param name="team">The team.</param>
    /// <returns>All players assigned to <paramref name="team"/>.</returns>
    public IEnumerable<Player> PlayersOf(HeykelSavasiTeam team) => this._teams.Where(kv => kv.Value == team).Select(kv => kv.Key);

    /// <summary>
    /// Gets <see cref="StatueBuffEffectNumbers"/>, exposed for unit tests only (see
    /// <c>HeykelSavasiContextTests.StatueBuffMap_HasSixEntriesInExpectedOrder</c>); the array itself stays
    /// <c>private</c> because it is an implementation detail of <see cref="ApplyStatueBuffToTeamAsync"/>.
    /// </summary>
    internal static short[] StatueBuffEffectNumbersForTest => StatueBuffEffectNumbers;

    /// <summary>
    /// Gets the number of the given team's own statues which have been broken by the opposing team so far.
    /// </summary>
    /// <param name="attacker">The attacking team.</param>
    /// <returns>The number of the opponent's statues <paramref name="attacker"/> has destroyed (0..<see cref="StatuesToBreak"/>).</returns>
    public int GetProgress(HeykelSavasiTeam attacker) => this._progress.GetProgress(attacker);

    /// <summary>
    /// Gets the team which has won the event by breaking all of the opponent's statues, if any.
    /// </summary>
    /// <returns>The winning team, or <see cref="HeykelSavasiTeam.None"/> if the event hasn't been decided yet.</returns>
    public HeykelSavasiTeam GetWinner() => this._progress.GetWinner();

    /// <summary>
    /// Atomically attempts to join the given player to the given team, reserving a slot under
    /// <see cref="_teamLock"/> to fix a check-then-act race between the balance check and the team
    /// assignment, then entering the mini game. If entering fails, the reservation is rolled back.
    /// </summary>
    /// <param name="player">The player who wants to join.</param>
    /// <param name="team">The team which the player wants to join.</param>
    /// <returns><c>true</c> if the player successfully joined <paramref name="team"/> and entered the mini game; otherwise, <c>false</c>.</returns>
    public async ValueTask<bool> TryJoinTeamAsync(Player player, HeykelSavasiTeam team)
    {
        bool reserved;
        lock (this._teamLock)
        {
            reserved = this.State == MiniGameState.Open
                       && this.GetTeam(player) == HeykelSavasiTeam.None
                       && this.CanJoin(team);
            if (reserved)
            {
                // Reserve the slot synchronously so a concurrent join sees the updated team count.
                this.AssignTeam(player, team);
            }
        }

        if (!reserved)
        {
            return false;
        }

        var success = false;
        try
        {
            var enterResult = await this.TryEnterAsync(player).ConfigureAwait(false);
            success = enterResult == EnterResult.Success;
        }
        finally
        {
            if (!success)
            {
                lock (this._teamLock)
                {
                    // Roll back the reservation; the player never actually entered the mini game
                    // (or TryEnterAsync threw, e.g. due to a disconnect/disposal race).
                    this.RemoveTeam(player);
                }
            }
        }

        if (success)
        {
            // One-shot HUD broadcast so every already-entered player sees the updated team counts immediately,
            // rather than waiting for the next tick of the periodic broadcast (see HudBroadcastLoopAsync).
            await this.BroadcastHudStateAsync().ConfigureAwait(false);
        }

        return success;
    }

    /// <summary>
    /// Removes the given player's team reservation, if any.
    /// </summary>
    /// <param name="player">The player.</param>
    private void RemoveTeam(Player player) => this._teams.TryRemove(player, out _);

    /// <summary>
    /// Removes a player from their team when they leave the event map for good (disconnect, or warp
    /// to another map such as Lorencia). A same-map death-respawn does NOT trigger this (RespawnAtAsync
    /// skips the map-removal when respawning on the same map), so dying at your own base keeps your team
    /// assignment and earned progress intact. This keeps team counts accurate so re-joining works.
    /// </summary>
    protected override async ValueTask OnObjectRemovedFromMapAsync((GameMap Map, ILocateable Object) args)
    {
        if (args.Object is Player player)
        {
            // Revert the uniform battle form before dropping the player from the roster, so a player who
            // leaves the event map mid-battle returns to their normal appearance.
            await this.RemoveTransformAsync(player).ConfigureAwait(false);
            this.RemoveTeam(player);
        }

        await base.OnObjectRemovedFromMapAsync(args).ConfigureAwait(false);
    }

    /// <inheritdoc />
    /// <remarks>
    /// Cancels the event if either team is empty at start (no opponent to fight); otherwise
    /// warps every participant to their team's base spawn gate.
    /// </remarks>
    protected override async ValueTask OnGameStartAsync(ICollection<Player> players)
    {
        await base.OnGameStartAsync(players).ConfigureAwait(false);

        if (this.TeamCount(HeykelSavasiTeam.Red) == 0 || this.TeamCount(HeykelSavasiTeam.Blue) == 0)
        {
            this.FinishEvent();
            return;
        }

        foreach (var player in players)
        {
            await player.WarpToAsync(this.GetTeamSpawnGate(this.GetTeam(player))).ConfigureAwait(false);
        }

        // Transform every participant into a single uniform battle form so their wings/mount/pet are
        // visually hidden and everyone shares the same base skin; the client adds the red/blue tint on top
        // via the per-player team roster (IHeykelSavasiTeamRosterPlugIn). Do this after the warp so the
        // appearance broadcast reaches the players' new (base map) scope.
        foreach (var player in players)
        {
            await this.TransformAsync(player).ConfigureAwait(false);
        }

        // Re-show the HUD panel promptly after the battle-start map change.
        await this.BroadcastHudStateAsync().ConfigureAwait(false);

        // Spawn ALL 7 statues (plus each statue's 3 guards) of both teams at their fixed positions, all
        // visible from battle start; the opposing team may break them in any order (guards first).
        for (var i = 0; i < StatuesToBreak; i++)
        {
            await this.SpawnStatueAsync(HeykelSavasiTeam.Red, i).ConfigureAwait(false);
            await this.SpawnStatueAsync(HeykelSavasiTeam.Blue, i).ConfigureAwait(false);
        }
    }

    /// <inheritdoc />
    /// <remarks>
    /// Awards <see cref="WinnerZenReward"/> Zen to every member of the winning team (see
    /// <see cref="GetWinner"/>); no reward is given on a draw (<see cref="HeykelSavasiTeam.None"/>). Mirrors
    /// the exact fallback pattern the framework itself uses for money rewards
    /// (<c>MiniGameContext.GiveRewardAsync</c>, MiniGameContext.cs:577-579): if a player's inventory can't
    /// hold the money, <see cref="Player.TryAddMoney"/> returns <see langword="false"/> and the player is
    /// notified via <see cref="Player.ShowLocalizedBlueMessageAsync"/>. Deliberately does not announce the
    /// result via <c>MiniGameContext.ShowGoldenMessageAsync</c>: that overload treats its argument as a
    /// localization resource key (see e.g. <c>BloodCastleContext.OnObjectRemovedFromMapAsync</c>'s
    /// <c>nameof(PlayerMessage.BloodCastleCrystalStatusDestroyed)</c> usage), not literal text, so there is no
    /// existing resource key for a Heykel Savasi win/draw announcement to pass here; adding one is out of
    /// scope for this task. Does not warp players itself either: once the base call below returns, the
    /// framework's own shutdown path calls <c>MovePlayersToSafezoneAsync</c>, which - because
    /// <see cref="MiniGameContext.State"/> is no longer <see cref="MiniGameState.Playing"/> at that point -
    /// resolves every participant's respawn gate to the map's configured <c>SafezoneMap</c> (Lorencia).
    /// </remarks>
    protected override async ValueTask GameEndedAsync(ICollection<Player> finishers)
    {
        var winner = this.GetWinner();
        if (winner != HeykelSavasiTeam.None)
        {
            foreach (var player in this.PlayersOf(winner).ToList())
            {
                if (!player.TryAddMoney(WinnerZenReward))
                {
                    await player.ShowLocalizedBlueMessageAsync(nameof(PlayerMessage.AwardMoneyFailByFullInventory)).ConfigureAwait(false);
                }
            }
        }

        // Revert the uniform battle form applied in OnGameStartAsync so players return to their normal appearance.
        foreach (var player in finishers)
        {
            await this.RemoveTransformAsync(player).ConfigureAwait(false);
        }

        // Final HUD broadcast: by now MiniGameContext.State is already MiniGameState.Ended (StopAsync sets it
        // before calling this method), so ComputeHudPhaseAndRemaining naturally reports phase 3/0 seconds. This
        // is needed because the periodic loop (HudBroadcastLoopAsync) stops exactly at this same state
        // transition (it runs off GameEndedToken, which StopAsync cancels right before setting State to Ended).
        await this.BroadcastHudStateAsync().ConfigureAwait(false);

        await base.GameEndedAsync(finishers).ConfigureAwait(false);
    }

    /// <summary>
    /// Gets the players which would receive the winner's Zen reward if the event ended right now, for unit
    /// tests only (a full <see cref="GameEndedAsync"/> run needs a live <see cref="Player"/> with a working
    /// <see cref="Player.TryAddMoney"/>/inventory, which isn't practical to construct in a fast unit test).
    /// </summary>
    /// <returns>The winning team's players, or an empty sequence if the event hasn't been decided yet.</returns>
    internal IEnumerable<Player> GetRewardTargetsForTest()
        => this.GetWinner() == HeykelSavasiTeam.None ? Enumerable.Empty<Player>() : this.PlayersOf(this.GetWinner());

    /// <inheritdoc />
    /// <remarks>
    /// Note: <see cref="MiniGameContext.OnObjectAddedToMapAsync"/> already subscribes every
    /// <see cref="Destructible"/> added to <see cref="MiniGameContext.Map"/> to
    /// <see cref="OnDestructibleDied"/> (see MiniGameContext.cs), so statues spawned via
    /// <see cref="SpawnStatueAsync"/> are routed here automatically; this override must not
    /// subscribe <c>Died</c> again.
    /// </remarks>
    protected override void OnDestructibleDied(object? sender, DeathInformation e)
    {
        base.OnDestructibleDied(sender, e);

        if (sender is not AttackableNpcBase npc || !this._statues.TryRemove(npc, out var info))
        {
            return;
        }

        // The statue is gone; drop its guard bookkeeping too (its guards were already dead - a statue can
        // only be hit once its 3 guards fall - but this keeps the maps from leaking a stale entry).
        this._statueGuardsAlive.TryRemove(npc, out _);

        var attacker = Opponent(info.Defender);

        // Any-order, count-based progress: this break increments the attacker's running total (0..7),
        // independent of which statue index fell.
        this.HandleStatueDestroyed(info.Defender, info.Index, attacker, spawnNext: false);
        var count = this.GetProgress(attacker);

        // Fire-and-forget the async side effects (break announcement, buff application, or finishing the
        // event); the death event handler itself must stay synchronous.
        _ = this.OnStatueDestroyedSideEffectsAsync(attacker, count, e.KillerName);
    }

    /// <inheritdoc />
    /// <remarks>
    /// ADAMU-CUSTOM (Heykel Savasi): guards spawned by <see cref="SpawnStatueAsync"/> are ordinary
    /// <see cref="Monster"/>s, so their <c>Died</c> event is auto-subscribed to this handler by
    /// <see cref="MiniGameContext.OnObjectAddedToMapAsync"/>. When a guard dies we decrement the living-guard
    /// count of the statue it protected; only once that count reaches 0 does <see cref="IsStatueAttackBlocked"/>
    /// let players damage the statue.
    /// </remarks>
    protected override void OnMonsterDied(object? sender, DeathInformation e)
    {
        base.OnMonsterDied(sender, e);

        if (sender is AttackableNpcBase guard && this._guardToStatue.TryRemove(guard, out var statue))
        {
            this._statueGuardsAlive.AddOrUpdate(statue, 0, (_, alive) => alive > 0 ? alive - 1 : 0);
        }
    }

    /// <summary>
    /// Registers, for tests only, that <paramref name="attacker"/> destroyed <paramref name="defender"/>'s
    /// statue at <paramref name="index"/>, without triggering any spawn/warp/buff side effects.
    /// </summary>
    /// <param name="defender">The team whose statue was destroyed.</param>
    /// <param name="index">The index (0..6) of the destroyed statue in <paramref name="defender"/>'s line.</param>
    /// <param name="attacker">The team which destroyed the statue.</param>
    internal void RegisterStatueDestroyedForTest(HeykelSavasiTeam defender, int index, HeykelSavasiTeam attacker)
        => this.HandleStatueDestroyed(defender, index, attacker, spawnNext: false);

    /// <summary>
    /// Gets the fixed sequence of 7 statue positions defending <paramref name="team"/>'s own line (attacked
    /// by the opposing team). Index 0 is the outermost/first statue, index 6 is the final one.
    /// </summary>
    /// <param name="team">The defending team.</param>
    /// <returns>The 7 statue positions of <paramref name="team"/>'s line, or an empty array for <see cref="HeykelSavasiTeam.None"/>.</returns>
    /// <remarks>
    /// This is deliberately kept in the GameLogic project (rather than
    /// <c>Persistence.Initialization/VersionSeasonSix/Maps/HeykelSavasiMap.cs</c>, as originally sketched in
    /// the task brief) because <c>MUnique.OpenMU.GameLogic</c> does not - and must not - reference
    /// <c>MUnique.OpenMU.Persistence.Initialization</c>; the dependency only goes the other way.
    /// </remarks>
    internal static Point[] StatuePositions(HeykelSavasiTeam team)
    {
        return team switch
        {
            HeykelSavasiTeam.Red => RedStatuePositions,
            HeykelSavasiTeam.Blue => BlueStatuePositions,
            _ => Array.Empty<Point>(),
        };
    }

    /// <summary>
    /// Determines, in a pure way, whether joining <paramref name="team"/> is allowed given the current
    /// team counts, according to the balance rule: the absolute difference between the red and blue
    /// team sizes must not exceed <see cref="MaxTeamDifference"/> after the prospective join.
    /// </summary>
    /// <param name="redCount">The current number of players in the red team.</param>
    /// <param name="blueCount">The current number of players in the blue team.</param>
    /// <param name="team">The team which a player wants to join.</param>
    /// <returns><c>true</c> if the join is allowed; otherwise, <c>false</c>.</returns>
    internal static bool IsJoinAllowed(int redCount, int blueCount, HeykelSavasiTeam team)
    {
        switch (team)
        {
            case HeykelSavasiTeam.Red:
                redCount++;
                break;
            case HeykelSavasiTeam.Blue:
                blueCount++;
                break;
            default:
                return false;
        }

        return Math.Abs(redCount - blueCount) <= MaxTeamDifference;
    }

    /// <summary>
    /// Gets the opposing team of <paramref name="team"/>. <see cref="HeykelSavasiTeam.None"/> maps to itself.
    /// </summary>
    /// <param name="team">The team.</param>
    /// <returns>The opposing team.</returns>
    private static HeykelSavasiTeam Opponent(HeykelSavasiTeam team) => team switch
    {
        HeykelSavasiTeam.Red => HeykelSavasiTeam.Blue,
        HeykelSavasiTeam.Blue => HeykelSavasiTeam.Red,
        _ => HeykelSavasiTeam.None,
    };

    /// <summary>
    /// Pure state transition shared by the runtime death handler (<see cref="OnDestructibleDied"/>) and the
    /// test-only <see cref="RegisterStatueDestroyedForTest"/>: records the attacker's progress and, once
    /// <see cref="StatuesToBreak"/> statues have fallen, the winner. Spawning the next statue and applying
    /// buffs are runtime-only side effects, triggered separately by the caller when <paramref name="spawnNext"/>
    /// is <c>true</c> (see <see cref="OnStatueDestroyedSideEffectsAsync"/>).
    /// </summary>
    /// <param name="defender">The team whose statue was destroyed.</param>
    /// <param name="index">The index (0..6) of the destroyed statue in <paramref name="defender"/>'s line.</param>
    /// <param name="attacker">The team which destroyed the statue.</param>
    /// <param name="spawnNext">
    /// Unused by this pure method; documents, at call sites, whether the caller intends to trigger the
    /// runtime spawn-next/buff/finish side effects afterwards (<see langword="true"/> from
    /// <see cref="OnDestructibleDied"/>) or not (<see langword="false"/> from tests).
    /// </param>
    private void HandleStatueDestroyed(HeykelSavasiTeam defender, int index, HeykelSavasiTeam attacker, bool spawnNext)
    {
        _ = defender;
        _ = spawnNext;
        this._progress.RegisterDestroyed(index, attacker);
    }

    /// <summary>
    /// Handles the async side effects of a statue's destruction: announcing the break (running counter +
    /// killer name) to all event players, applying the count-based destruction buff to the attacking team,
    /// and finishing the event once the attacker has broken all <see cref="StatuesToBreak"/> of the
    /// opponent's statues. Statues are no longer spawned here - all of them are spawned up-front at battle
    /// start (see <see cref="OnGameStartAsync"/>).
    /// </summary>
    /// <param name="attacker">The team which destroyed the statue.</param>
    /// <param name="count">The attacker's running number of statues broken so far (1..<see cref="StatuesToBreak"/>).</param>
    /// <param name="killerName">The character name of the player who dealt the killing blow.</param>
    private async ValueTask OnStatueDestroyedSideEffectsAsync(HeykelSavasiTeam attacker, int count, string killerName)
    {
        try
        {
            // One-shot HUD broadcast: the progress counter was already updated synchronously by
            // HandleStatueDestroyed (called from OnDestructibleDied before this method was scheduled), so every
            // player sees the new progress immediately rather than waiting for the next periodic tick.
            await this.BroadcastHudStateAsync().ConfigureAwait(false);

            // Yellow center announcement to every event player: running counter + the destroyer's name.
            var message = $"{count} Heykel {killerName} tarafindan yok edildi";
            foreach (var player in this.PlayersOf(HeykelSavasiTeam.Red).Concat(this.PlayersOf(HeykelSavasiTeam.Blue)).ToList())
            {
                await player.InvokeViewPlugInAsync<MUnique.OpenMU.GameLogic.Views.IShowMessagePlugIn>(
                    p => p.ShowMessageAsync(message, MUnique.OpenMU.Interfaces.MessageType.GoldenCenter)).ConfigureAwait(false);
            }

            // Count-based buff: 1st break -> buff index 0, ... 6th -> index 5, 7th -> none (bounds guard).
            await this.ApplyStatueBuffToTeamAsync(attacker, count - 1).ConfigureAwait(false);

            if (this.GetWinner() == attacker)
            {
                this.FinishEvent();
            }
        }
        catch (Exception ex)
        {
            this.Logger.LogError(ex, "{context}: Error handling statue-destroyed side effects for attacker {attacker}, count {count}.", this, attacker, count);
        }
    }

    /// <summary>
    /// Spawns <paramref name="defender"/>'s statue at <paramref name="index"/> in its line, plus 3 guard
    /// mobs around it, using the same runtime-spawn API the map initializer itself uses
    /// (<see cref="IMapInitializer.InitializeSpawnAsync"/>; see also Castle Siege's
    /// <c>CastleSiegeEventPlugIn.SpawnCastleDefensesAsync</c> for the reference pattern). The spawned statue
    /// is registered in <see cref="_statues"/> so <see cref="OnDestructibleDied"/> can attribute its death to
    /// the correct defender/index; its <c>Died</c> event does not need to be subscribed here because
    /// <see cref="MiniGameContext.OnObjectAddedToMapAsync"/> already does so for every
    /// <see cref="Destructible"/> added to <see cref="MiniGameContext.Map"/>.
    /// </summary>
    /// <param name="defender">The team whose statue line is being extended.</param>
    /// <param name="index">The index (0..6) of the statue to spawn in <paramref name="defender"/>'s line.</param>
    private async ValueTask SpawnStatueAsync(HeykelSavasiTeam defender, int index)
    {
        try
        {
            var positions = StatuePositions(defender);
            if (index < 0 || index >= positions.Length)
            {
                this.Logger.LogWarning("{context}: Statue index {index} is out of range for defender {defender}.", this, index, defender);
                return;
            }

            // Statues are placed at FIXED coordinates and all spawned up-front, so both teams' 7 statues
            // are visible from battle start and can be broken in any order.
            var pos = positions[index];

            var statueDefinition = this._gameContext.Configuration.Monsters.FirstOrDefault(m => m.Number == StatueMonsterNumber);
            if (statueDefinition is null)
            {
                this.Logger.LogWarning("{context}: Statue monster definition {number} not found.", this, StatueMonsterNumber);
                return;
            }

            // Distinct spawn-index ranges per (defender, index), so the up-front spawns never collide:
            // e.g. Red index 0 -> 1000..1003, Blue index 3 -> 2030..2033.
            var spawnIndexBase = ((int)defender * 1000) + (index * 10);

            var statueSpawnArea = new MonsterSpawnArea
            {
                MonsterDefinition = statueDefinition,
                Quantity = 1,
                X1 = pos.X,
                X2 = pos.X,
                Y1 = pos.Y,
                Y2 = pos.Y,
                Direction = Direction.South,
                SpawnTrigger = SpawnTrigger.OnceAtEventStart,
            };

            var statueNpc = await this._mapInitializer.InitializeSpawnAsync(spawnIndexBase, this.Map, statueSpawnArea, this).ConfigureAwait(false);
            if (statueNpc is not AttackableNpcBase statue)
            {
                return;
            }

            this._statues[statue] = (defender, index);

            // This statue starts fully guarded; it becomes damageable only once all 3 guards are dead.
            this._statueGuardsAlive[statue] = GuardsPerStatue;

            var guardDefinition = this._gameContext.Configuration.Monsters.FirstOrDefault(m => m.Number == GuardMonsterNumber);
            if (guardDefinition is null)
            {
                this.Logger.LogWarning("{context}: Guard monster definition {number} not found.", this, GuardMonsterNumber);
                return;
            }

            for (var i = 0; i < GuardOffsets.Length; i++)
            {
                var (dx, dy) = GuardOffsets[i];
                var guardSpawnArea = new MonsterSpawnArea
                {
                    MonsterDefinition = guardDefinition,
                    Quantity = 1,
                    X1 = (byte)(pos.X + dx),
                    X2 = (byte)(pos.X + dx),
                    Y1 = (byte)(pos.Y + dy),
                    Y2 = (byte)(pos.Y + dy),
                    Direction = Direction.South,
                    SpawnTrigger = SpawnTrigger.OnceAtEventStart,
                };

                var guardNpc = await this._mapInitializer.InitializeSpawnAsync(spawnIndexBase + 1 + i, this.Map, guardSpawnArea, this).ConfigureAwait(false);

                // Guards are ordinary Monsters; their Died event is auto-subscribed to OnMonsterDied by
                // MiniGameContext.OnObjectAddedToMapAsync. We only need to remember which statue each guards.
                if (guardNpc is AttackableNpcBase guard)
                {
                    this._guardToStatue[guard] = statue;
                }
            }
        }
        catch (Exception ex)
        {
            this.Logger.LogError(ex, "{context}: Error spawning statue for defender {defender}, index {index}.", this, defender, index);
        }
    }

    /// <summary>
    /// Applies the class buff mapped to <paramref name="statueIndex"/> (see <see cref="StatueBuffEffectNumbers"/>)
    /// to every player currently on <paramref name="team"/>. A no-op for the 7th statue (index 6, out of
    /// range), which is the win condition rather than a buff trigger.
    /// </summary>
    /// <param name="team">The attacking team, whose players receive the buff.</param>
    /// <param name="statueIndex">The index (0..6) of the statue that was just destroyed.</param>
    private async ValueTask ApplyStatueBuffToTeamAsync(HeykelSavasiTeam team, int statueIndex)
    {
        if (statueIndex < 0 || statueIndex >= StatueBuffEffectNumbers.Length)
        {
            return;
        }

        var effectNumber = StatueBuffEffectNumbers[statueIndex];
        foreach (var player in this.PlayersOf(team).ToList())
        {
            await this.ApplyEffectAsync(player, effectNumber).ConfigureAwait(false);
        }
    }

    /// <summary>
    /// Applies a single, already-existing <see cref="MagicEffectDefinition"/> (looked up by
    /// <paramref name="effectNumber"/>) to <paramref name="player"/>, for <see cref="BuffDuration"/>.
    /// Mirrors the boost-construction pattern of <c>ApplyMagicEffectConsumeHandlerPlugIn.ConsumeItemAsyncCore</c>:
    /// each of the definition's <c>PowerUpDefinitions</c> is turned into a boost element bound to the
    /// player's own <see cref="Player.Attributes"/> system, so the buff scales off that player's stats.
    /// </summary>
    /// <param name="player">The player to buff.</param>
    /// <param name="effectNumber">The <see cref="MagicEffectDefinition.Number"/> of the effect to apply.</param>
    private async ValueTask ApplyEffectAsync(Player player, short effectNumber)
    {
        var def = player.GameContext.Configuration.MagicEffects.FirstOrDefault(m => m.Number == effectNumber);
        if (def is null || player.Attributes is null)
        {
            return;
        }

        var boosts = def.PowerUpDefinitions
            .Where(d => d.Boost is not null && d.TargetAttribute is not null)
            .Select(d => new MagicEffect.ElementWithTarget(player.Attributes.CreateElement(d), d.TargetAttribute!))
            .ToArray();
        if (boosts.Length == 0)
        {
            return;
        }

        var effect = new MagicEffect(BuffDuration, def, boosts!);
        await player.MagicEffectList.AddEffectAsync(effect).ConfigureAwait(false);
    }

    /// <summary>
    /// Re-applies every buff <paramref name="player"/>'s team has already earned (one per statue broken so
    /// far, indices [0..progress-1]) to <paramref name="player"/>. Intended for use on respawn (Task 5.3),
    /// since the existing buffs are configured with <c>StopByDeath=true</c> and are cleared on death.
    /// </summary>
    /// <param name="player">The player to re-buff.</param>
    internal async ValueTask ReapplyBuffsAsync(Player player)
    {
        var team = this.GetTeam(player);
        var earned = this.GetProgress(team);
        for (var i = 0; i < earned && i < StatueBuffEffectNumbers.Length; i++)
        {
            await this.ApplyEffectAsync(player, StatueBuffEffectNumbers[i]).ConfigureAwait(false);
        }
    }

    /// <summary>
    /// Reapplies the team's earned buffs to a player who just (re)spawned, and - while the battle is running -
    /// re-transforms them into the uniform battle form (death clears the transformation skin) and re-shows the
    /// HUD panel promptly after the respawn map change.
    /// </summary>
    /// <param name="player">The player who (re)spawned.</param>
    public async ValueTask OnPlayerRespawnedAsync(Player player)
    {
        await this.ReapplyBuffsAsync(player).ConfigureAwait(false);

        if (this.State == MiniGameState.Playing)
        {
            await this.TransformAsync(player).ConfigureAwait(false);
            await this.BroadcastHudStateAsync().ConfigureAwait(false);
        }
    }

    /// <summary>
    /// The <see cref="MonsterDefinition.Number"/> of the transformation skin every participant is turned into
    /// for the duration of the battle: 14 = Skeleton Warrior, a caped, walking humanoid soldier that reads as a
    /// reasonable uniform battle form and hides the player's wings/mount/pet. The red/blue distinction is added
    /// separately by the client via the per-player team roster (<see cref="IHeykelSavasiTeamRosterPlugIn"/>).
    /// </summary>
    // 0 = no monster transformation: players keep their normal body during the event. The team look
    // (red/blue cape + hidden wings/mount/pet) is done client-side (World93 render override), mirroring the
    // Battle Soccer event. Set to a monster number here only if a full skin-transform form is desired instead.
    private const short EventFormSkin = 0;

    /// <summary>
    /// Transforms <paramref name="player"/> into the uniform <see cref="EventFormSkin"/> battle form, mirroring
    /// the exact mechanism of <c>SkinChatCommandPlugIn</c> (the <c>/skin</c> command): it composes an
    /// <see cref="AggregateType.AddRaw"/> element onto the player's <see cref="Stats.TransformationSkin"/>
    /// attribute and sets the attribute value, which fires <c>Player.OnTransformationSkinChanged</c> and
    /// re-broadcasts the player's appearance to observers.
    /// </summary>
    /// <param name="player">The player to transform.</param>
    private ValueTask TransformAsync(Player player) => this.SetTransformationSkinAsync(player, EventFormSkin);

    /// <summary>
    /// Reverts <paramref name="player"/>'s transformation by resetting <see cref="Stats.TransformationSkin"/> to
    /// 0 (no transformation), which restores the player's normal appearance (wings/mount/pet included). Mirrors
    /// how <c>/skin 0</c> removes the added skin element.
    /// </summary>
    /// <param name="player">The player to revert.</param>
    private ValueTask RemoveTransformAsync(Player player) => this.SetTransformationSkinAsync(player, 0);

    /// <summary>
    /// Sets <paramref name="player"/>'s <see cref="Stats.TransformationSkin"/> to <paramref name="skin"/> exactly
    /// as <c>SkinChatCommandPlugIn</c> does: clear any previously composed elements, add a single
    /// <see cref="AggregateType.AddRaw"/> element with the target value, then write the attribute value (which is
    /// what actually triggers the appearance re-broadcast). A value of 0 fully reverts to the natural appearance.
    /// </summary>
    /// <param name="player">The player whose transformation skin to set.</param>
    /// <param name="skin">The transformation skin number (0 = none/revert).</param>
    private ValueTask SetTransformationSkinAsync(Player player, short skin)
    {
        if (player.Attributes is { } attributes
            && attributes.GetComposableAttribute(Stats.TransformationSkin) is { } attribute)
        {
            attribute.Elements.ToList().ForEach(attribute.RemoveElement);
            attribute.AddElement(attributes.CreateElement(new MUnique.OpenMU.Persistence.BasicModel.PowerUpDefinitionValue { AggregateType = MUnique.OpenMU.AttributeSystem.AggregateType.AddRaw, Value = skin }, Stats.TransformationSkin));
            attributes[Stats.TransformationSkin] = skin;
        }

        return ValueTask.CompletedTask;
    }

    /// <summary>
    /// Periodically (about once per second) broadcasts the Heykel Savasi HUD state
    /// (<see cref="IHeykelSavasiHudStatePlugIn"/>) to every entered player, covering the registration phase
    /// (<see cref="MiniGameState.Open"/>), the preparation countdown (<see cref="MiniGameState.Closed"/>), and
    /// the battle itself (<see cref="MiniGameState.Playing"/>). Started once from the constructor via
    /// <c>Task.Run</c> (mirroring <see cref="MiniGameContext"/>'s own pattern for its private game loop).
    /// </summary>
    /// <remarks>
    /// Stops as soon as <see cref="MiniGameContext.GameEndedToken"/> is cancelled, which happens exactly when
    /// the game transitions to <see cref="MiniGameState.Ended"/> (see <c>MiniGameContext.StopAsync</c>, which
    /// cancels the token and only then sets <see cref="MiniGameContext.State"/> to <see cref="MiniGameState.Ended"/>
    /// before calling <see cref="GameEndedAsync"/>); the final "ended" broadcast is sent separately, from
    /// <see cref="GameEndedAsync"/> itself, once <see cref="MiniGameContext.State"/> is actually <see cref="MiniGameState.Ended"/>.
    /// </remarks>
    /// <param name="cancellationToken">The token which is cancelled once the game ends.</param>
    private async ValueTask HudBroadcastLoopAsync(CancellationToken cancellationToken)
    {
        try
        {
            using var timer = new PeriodicTimer(TimeSpan.FromSeconds(1));
            do
            {
                await this.BroadcastHudStateAsync().ConfigureAwait(false);
                await this.BroadcastTeamRosterAsync().ConfigureAwait(false);
            }
            while (await timer.WaitForNextTickAsync(cancellationToken).ConfigureAwait(false));
        }
        catch (OperationCanceledException)
        {
            // Expected: the game ended; see GameEndedAsync for the final broadcast.
        }
        catch (Exception ex)
        {
            this.Logger.LogError(ex, "{context}: Error in the HUD broadcast loop.", this);
        }
    }

    /// <summary>
    /// Sends the current Heykel Savasi HUD state (see <see cref="ComputeHudPhaseAndRemaining"/>) to every
    /// entered player via <see cref="IHeykelSavasiHudStatePlugIn"/>. Called both periodically (see
    /// <see cref="HudBroadcastLoopAsync"/>) and as a one-shot update from <see cref="TryJoinTeamAsync"/> (on a
    /// successful join), <see cref="OnStatueDestroyedSideEffectsAsync"/> (on a statue break), and
    /// <see cref="GameEndedAsync"/> (final state).
    /// </summary>
    private async ValueTask BroadcastHudStateAsync()
    {
        var (phase, remainingSeconds) = this.ComputeHudPhaseAndRemaining();
        var redCount = (byte)this.TeamCount(HeykelSavasiTeam.Red);
        var blueCount = (byte)this.TeamCount(HeykelSavasiTeam.Blue);
        var redProgress = (byte)this.GetProgress(HeykelSavasiTeam.Red);
        var blueProgress = (byte)this.GetProgress(HeykelSavasiTeam.Blue);

        await this.ForEachPlayerAsync(player => player.InvokeViewPlugInAsync<IHeykelSavasiHudStatePlugIn>(p =>
                p.UpdateHudStateAsync(phase, (byte)this.GetTeam(player), redCount, blueCount, redProgress, blueProgress, remainingSeconds))
            .AsTask()).ConfigureAwait(false);
    }

    /// <summary>
    /// Sends the current team roster (every participating player's network id and team) to every entered
    /// player via <see cref="IHeykelSavasiTeamRosterPlugIn"/>, so the client can tint each nearby event player
    /// red or blue. Broadcast on the same ~1s cadence as the HUD state (see <see cref="HudBroadcastLoopAsync"/>).
    /// </summary>
    private async ValueTask BroadcastTeamRosterAsync()
    {
        var entries = this._teams
            .Where(kv => kv.Value != HeykelSavasiTeam.None)
            .Select(kv => (kv.Key.Id, (byte)kv.Value))
            .ToList();

        await this.ForEachPlayerAsync(player => player.InvokeViewPlugInAsync<IHeykelSavasiTeamRosterPlugIn>(p =>
                p.UpdateTeamRosterAsync(entries))
            .AsTask()).ConfigureAwait(false);
    }

    /// <summary>
    /// Determines the current HUD phase and the estimated number of seconds remaining in it, purely from
    /// <see cref="MiniGameContext.State"/> and wall-clock timestamps recorded (lazily, on first observation) at
    /// each relevant state transition. This is an approximation, not authoritative timing: <see cref="_createdAtUtc"/>
    /// is set at construction time, which happens moments before <c>MiniGameContext.RunGameAsync</c>'s own
    /// <c>Task.Run</c> starts counting down <see cref="MiniGameDefinition.EnterDuration"/>, and
    /// <see cref="_closedAtUtc"/>/<see cref="_playingAtUtc"/> are set by whichever caller (the periodic loop or a
    /// one-shot broadcast) first observes the corresponding state - always within about a second of the real
    /// transition, which is precise enough for a HUD countdown.
    /// </summary>
    /// <returns>The current phase (0-3, see <see cref="IHeykelSavasiHudStatePlugIn.UpdateHudStateAsync"/>) and the
    /// estimated remaining seconds in that phase.</returns>
    private (byte Phase, ushort RemainingSeconds) ComputeHudPhaseAndRemaining()
    {
        var now = DateTime.UtcNow;
        switch (this.State)
        {
            case MiniGameState.Open:
                return (0, ClampToUInt16Seconds(this.Definition.EnterDuration - (now - this._createdAtUtc)));

            case MiniGameState.Closed:
                this._closedAtUtc ??= now;
                return (1, ClampToUInt16Seconds(PreparationDuration - (now - this._closedAtUtc.Value)));

            case MiniGameState.Playing:
                this._playingAtUtc ??= now;
                return (2, ClampToUInt16Seconds(this.Definition.GameDuration - (now - this._playingAtUtc.Value)));

            default:
                // Undefined, Ended, or Disposed: the event is over (or hasn't been set up yet).
                return (3, 0);
        }
    }

    /// <summary>
    /// Converts <paramref name="remaining"/> to a <see cref="ushort"/> seconds count for the HUD packet,
    /// clamping negative durations to 0.
    /// </summary>
    /// <param name="remaining">The remaining duration.</param>
    private static ushort ClampToUInt16Seconds(TimeSpan remaining)
    {
        if (remaining <= TimeSpan.Zero)
        {
            return 0;
        }

        var seconds = remaining.TotalSeconds;
        return seconds >= ushort.MaxValue ? ushort.MaxValue : (ushort)seconds;
    }

    /// <summary>
    /// Pure, dependency-free tracker for statue-break progress and win detection. Extracted out of
    /// <see cref="HeykelSavasiContext"/> so it can be unit-tested directly, without constructing a full
    /// context (whose constructor requires a live <see cref="IGameContext"/>/<see cref="IMapInitializer"/>
    /// and starts a background game loop via <c>Task.Run</c> - impractical in a fast unit test; see also
    /// <see cref="IsJoinAllowed"/>, extracted for the same reason). Kept <c>internal</c> (rather than
    /// <c>private</c>) specifically so <c>MUnique.OpenMU.Tests</c> can drive it directly.
    /// </summary>
    internal sealed class StatueProgressState
    {
        private readonly ConcurrentDictionary<HeykelSavasiTeam, int> _progress = new()
        {
            [HeykelSavasiTeam.Red] = 0,
            [HeykelSavasiTeam.Blue] = 0,
        };

        private HeykelSavasiTeam _winner = HeykelSavasiTeam.None;

        /// <summary>
        /// Gets the number of the opponent's statues <paramref name="attacker"/> has destroyed so far.
        /// </summary>
        /// <param name="attacker">The attacking team.</param>
        public int GetProgress(HeykelSavasiTeam attacker) => this._progress.TryGetValue(attacker, out var value) ? value : 0;

        /// <summary>
        /// Gets the winning team, or <see cref="HeykelSavasiTeam.None"/> if undecided.
        /// </summary>
        public HeykelSavasiTeam GetWinner() => this._winner;

        /// <summary>
        /// Registers that <paramref name="attacker"/> destroyed one of the opponent's statues. Progress is a
        /// running COUNT (statues can be broken in any order), so this simply increments the attacker's total
        /// by one; once the count reaches <see cref="StatuesToBreak"/> the attacker is recorded as the winner.
        /// Once a winner is set, further registrations are ignored.
        /// </summary>
        /// <param name="index">
        /// The index of the destroyed statue in the defender's line. No longer used for sequencing (breaks are
        /// order-independent); retained for signature/call-site compatibility only.
        /// </param>
        /// <param name="attacker">The team which destroyed the statue.</param>
        public void RegisterDestroyed(int index, HeykelSavasiTeam attacker)
        {
            _ = index;
            if (this._winner != HeykelSavasiTeam.None)
            {
                return;
            }

            var newCount = this.GetProgress(attacker) + 1;
            this._progress[attacker] = newCount;

            if (newCount >= StatuesToBreak)
            {
                this._winner = attacker;
            }
        }
    }
}