yuanshen/Yuanshen.Gameserver/Game/CombatManager.cs

using Microsoft.Extensions.Logging;
using Yuanshen.Gameserver.Database;
using Yuanshen.Gameserver.Network.Session;
using Yuanshen.Protocol;

namespace Yuanshen.Gameserver.Game;

internal sealed class CombatManager
{
    private const uint FightPropCurHp = 1010;
    private const uint FightPropMaxHp = 2000;
    private const uint ActionReasonMonsterDie = 37;
    private const uint ActionReasonMonsterEnvAnimal = 8;
    private const uint MoraItemId = 202;
    private const uint PrimogemItemId = 201;

    private static readonly Random Random = new();

    private readonly NetSession _session;
    private readonly Player _player;
    private readonly PlayerPersistence _persistence;
    private readonly DropTable _drops;
    private readonly ILogger _logger;

    public CombatManager(NetSession session, Player player, PlayerPersistence persistence, DropTable drops,
        ILogger<CombatManager> logger)
    {
        _session = session;
        _player = player;
        _persistence = persistence;
        _drops = drops;
        _logger = logger;
    }

    public async ValueTask HandleAttackAsync(AttackResult attack)
    {
        GameMonster? monster = _player.Monsters.FirstOrDefault(m => m.EntityId == attack.DefenseId);
        if (monster is null)
        {
            _logger.LogDebug("hit on non-monster entity {id}", attack.DefenseId);
            return;
        }

        if (!monster.IsAlive || attack.Damage <= 0f)
        {
            _logger.LogDebug("hit ignored on {id}: alive={alive} damage={dmg}", attack.DefenseId, monster.IsAlive, attack.Damage);
            return;
        }

        _logger.LogInformation("monster {mid} takes {dmg} damage ({hp} -> {left})",
            monster.MonsterId, attack.Damage, monster.CurrentHp, monster.CurrentHp - attack.Damage);

        float remaining = monster.ApplyDamage(attack.Damage);

        await _session.NotifyAsync(CmdType.EntityFightPropUpdateNotify, new EntityFightPropUpdateNotify
        {
            EntityId = monster.EntityId,
            FightPropMap =
            {
                { FightPropCurHp, remaining }
            }
        });

        if (remaining > 0f)
            return;

        _logger.LogInformation("Monster {monsterId} killed by entity {attacker}", monster.MonsterId, attack.AttackerId);

        if (monster.NodeId != 0)
            _player.MarkNodeKilled(monster.NodeId);

        await GrantDropsAsync(monster);

        if (monster.NodeId != 0)
            await _persistence.SaveAsync();

        await _session.NotifyAsync(CmdType.LifeStateChangeNotify, new LifeStateChangeNotify
        {
            EntityId = monster.EntityId,
            LifeState = 2,
            SourceEntityId = attack.AttackerId,
            DieType = PlayerDieType.PlayerDieKillByMonster
        });

        await _session.NotifyAsync(CmdType.SceneEntityDisappearNotify, new SceneEntityDisappearNotify
        {
            DisappearType = VisionType.VisionDie,
            EntityList = { monster.EntityId }
        });

        _player.Monsters.Remove(monster);
    }

    private async ValueTask GrantDropsAsync(GameMonster monster)
    {
        uint dropId = _drops.DropIdFor(monster.MonsterId, monster.Level);
        if (dropId == 0)
            return;

        Dictionary<uint, uint> rolled = _drops.Roll(dropId, Random);
        if (rolled.Count == 0)
            return;

        StoreItemChangeNotify store = new() { StoreType = StoreType.StorePack };
        ItemAddHintNotify hint = new()
        {
            Reason = monster.IsWildlife ? ActionReasonMonsterEnvAnimal : ActionReasonMonsterDie,
            Position = monster.Pos,
            IsPositionValid = true
        };

        List<string> granted = new();
        bool currencyChanged = false;

        foreach ((uint itemId, uint count) in rolled)
        {
            switch (_drops.TypeOf(itemId))
            {
                case "weapon":
                    for (uint made = 0; made < Math.Min(count, 10u); made++)
                        store.ItemList.Add(_player.CreateWeapon(itemId).AsItem());
                    break;

                case "virtual" when itemId == MoraItemId:
                    _player.Scoin += count;
                    currencyChanged = true;
                    break;

                case "virtual" when itemId == PrimogemItemId:
                    _player.Hcoin += count;
                    currencyChanged = true;
                    break;

                case "virtual":
                    continue;

                case "reliquary":
                    continue;

                default:
                    _player.GiveMaterial(itemId, count);
                    store.ItemList.Add(new Item
                    {
                        ItemId = itemId,
                        Guid = _player.MaterialGuid(itemId),
                        Material = new Material { Count = _player.Materials.GetValueOrDefault(itemId) }
                    });
                    break;
            }

            hint.ItemList.Add(new ItemHint { ItemId = itemId, Count = count, IsNew = false });
            granted.Add($"{itemId}x{count}");
        }

        if (hint.ItemList.Count == 0)
            return;

        if (store.ItemList.Count != 0)
            await _session.NotifyAsync(CmdType.StoreItemChangeNotify, store);

        if (currencyChanged)
            await _session.NotifyAsync(CmdType.PlayerPropNotify, _player.BuildCurrencyProps());

        await _session.NotifyAsync(CmdType.ItemAddHintNotify, hint);

        _logger.LogInformation("Monster {monsterId} lvl {level} dropped {items}",
            monster.MonsterId, monster.Level, string.Join(", ", granted));
    }
}