using Microsoft.Extensions.Logging;
using Yuanshen.Common.Data.Excel;
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 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 SceneManager _scene;
    private readonly ExcelTableCollection _excel;
    private readonly ILogger _logger;

    public CombatManager(NetSession session, Player player, PlayerPersistence persistence, DropTable drops,
        SceneManager scene, ExcelTableCollection excel, ILogger<CombatManager> logger)
    {
        _session = session;
        _player = player;
        _persistence = persistence;
        _drops = drops;
        _scene = scene;
        _excel = excel;
        _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 static Vector Scatter(Vector origin, int index)
    {
        double angle = index * 2.39996;
        double radius = 0.6 + index * 0.35;

        return new Vector
        {
            X = origin.X + (float)(Math.Cos(angle) * radius),
            Y = origin.Y + 0.4f,
            Z = origin.Z + (float)(Math.Sin(angle) * radius)
        };
    }

    private async ValueTask GrantDirectAsync(uint itemId, uint count)
    {
        if (itemId == MoraItemId)
        {
            _player.Scoin += count;
        }
        else if (itemId == PrimogemItemId)
        {
            _player.Hcoin += count;
        }
        else
        {
            _player.GiveMaterial(itemId, count);
            StoreItemChangeNotify store = new() { StoreType = StoreType.StorePack };
            store.ItemList.Add(new Item
            {
                ItemId = itemId,
                Guid = _player.MaterialGuid(itemId),
                Material = new Material { Count = _player.Materials.GetValueOrDefault(itemId) }
            });
            await _session.NotifyAsync(CmdType.StoreItemChangeNotify, store);
            return;
        }

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

    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;

        List<string> granted = new();
        int scattered = 0;

        foreach ((uint itemId, uint count) in rolled)
        {
            uint gadgetId = _excel.GetTable(ExcelType.Material).Items.OfType<MaterialExcel>()
                .FirstOrDefault(candidate => candidate.Id == itemId)?.GadgetId ?? 0;

            if (gadgetId == 0)
            {
                await GrantDirectAsync(itemId, count);
            }
            else
            {
                GameGadget drop = _player.SpawnDrop(gadgetId, itemId, count, Scatter(monster.Pos, scattered++));
                await _scene.AppearGadgetAsync(drop);
            }

            granted.Add($"{itemId}x{count}");
        }

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