// <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.Tasks;
using MUnique.OpenMU.DataModel.Configuration;
using MUnique.OpenMU.GameLogic.Attributes;
using MUnique.OpenMU.GameLogic.NPC;
using MUnique.OpenMU.GameLogic.PlayerActions.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 = 20;

    /// <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 = 20;

    /// <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 = 220;

    /// <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 = 220;

    /// <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 <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 4 guards spawn.
    /// </summary>
    private static readonly (int Dx, int Dy)[] GuardOffsets = { (-2, 0), (2, 0), (0, -2), (0, 2) };

    /// <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>
    /// PLACEHOLDER coordinates: the Heykel Savasi map terrain is not final yet, so these positions are an
    /// approximate straight line from mid-map toward the red base (20, 20). Index 0 is the outermost statue
    /// (attacked first by the blue team), index 6 is the final statue, closest to the red base (win condition
    /// for blue once broken).
    /// </summary>
    private static readonly Point[] RedStatuePositions =
    {
        new(100, 100),
        new(88, 88),
        new(77, 77),
        new(65, 65),
        new(53, 53),
        new(42, 42),
        new(30, 30),
    };

    /// <summary>
    /// PLACEHOLDER coordinates: the Heykel Savasi map terrain is not final yet, so these positions are an
    /// approximate straight line from mid-map toward the blue base (220, 220). Index 0 is the outermost statue
    /// (attacked first by the red team), index 6 is the final statue, closest to the blue base (win condition
    /// for red once broken).
    /// </summary>
    private static readonly Point[] BlueStatuePositions =
    {
        new(140, 140),
        new(152, 152),
        new(163, 163),
        new(175, 175),
        new(187, 187),
        new(198, 198),
        new(210, 210),
    };

    private readonly IGameContext _gameContext;
    private readonly IMapInitializer _mapInitializer;

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

    /// <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>
    /// 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;
    }

    /// <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>
    /// 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)
    {
        var (anchorX1, anchorY1) = team == HeykelSavasiTeam.Blue
            ? (BlueBaseAnchorX1, BlueBaseAnchorY1)
            : (RedBaseAnchorX1, RedBaseAnchorY1);

        return this.Definition.Entrance!.Map!.ExitGates.First(g => g.X1 == anchorX1 && g.Y1 == anchorY1);
    }

    /// <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);
                }
            }
        }

        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 _);

    /// <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);
        }

        // Spawn the first (outermost) statue of each team's line; the opposing team attacks it.
        await this.SpawnStatueAsync(HeykelSavasiTeam.Red, 0).ConfigureAwait(false);
        await this.SpawnStatueAsync(HeykelSavasiTeam.Blue, 0).ConfigureAwait(false);
    }

    /// <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;
        }

        var attacker = Opponent(info.Defender);
        this.HandleStatueDestroyed(info.Defender, info.Index, attacker, spawnNext: true);

        // Fire-and-forget the async side effects (buff application, spawning the next statue, or
        // finishing the event); the death event handler itself must stay synchronous.
        _ = this.OnStatueDestroyedSideEffectsAsync(info.Defender, info.Index, attacker);
    }

    /// <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: applying the destruction buff to the
    /// attacking team, finishing the event if that statue was the winning one, or spawning the defender's
    /// next statue (plus guards) otherwise.
    /// </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>
    private async ValueTask OnStatueDestroyedSideEffectsAsync(HeykelSavasiTeam defender, int index, HeykelSavasiTeam attacker)
    {
        try
        {
            await this.ApplyStatueBuffToTeamAsync(attacker, index).ConfigureAwait(false);

            if (this.GetWinner() == attacker)
            {
                this.FinishEvent();
                return;
            }

            await this.SpawnStatueAsync(defender, index + 1).ConfigureAwait(false);
        }
        catch (Exception ex)
        {
            this.Logger.LogError(ex, "{context}: Error handling statue-destroyed side effects for defender {defender}, index {index}.", this, defender, index);
        }
    }

    /// <summary>
    /// Spawns <paramref name="defender"/>'s statue at <paramref name="index"/> in its line, plus 4 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;
            }

            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 repeated calls across the event
            // never collide: e.g. Red index 0 -> 1000..1004, Blue index 3 -> 2030..2034.
            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 AttackableNpcBase attackable)
            {
                this._statues[attackable] = (defender, index);
            }

            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,
                };

                await this._mapInitializer.InitializeSpawnAsync(spawnIndexBase + 1 + i, this.Map, guardSpawnArea, this).ConfigureAwait(false);
            }
        }
        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.</summary>
    /// <param name="player">The player who (re)spawned.</param>
    public ValueTask OnPlayerRespawnedAsync(Player player) => this.ReapplyBuffsAsync(player);

    /// <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 the statue at <paramref name="index"/> in
        /// the opponent's line. Once a winner is set, further registrations are ignored.
        /// </summary>
        /// <param name="index">The index (0..6) of the destroyed statue.</param>
        /// <param name="attacker">The team which destroyed the statue.</param>
        public void RegisterDestroyed(int index, HeykelSavasiTeam attacker)
        {
            if (this._winner != HeykelSavasiTeam.None)
            {
                return;
            }

            this._progress[attacker] = index + 1;

            if (index + 1 >= StatuesToBreak)
            {
                this._winner = attacker;
            }
        }
    }
}