using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using SVSim.Database.Models;
using SVSim.Database.Models.Config;
using SVSim.Database.Repositories.Card;
using SVSim.Database.Repositories.Collectibles;

namespace SVSim.Database.Services.Inventory;

public sealed class InventoryService : IInventoryService
{
    private readonly SVSimDbContext _db;
    private readonly IGameConfigService _config;
    private readonly ICardRepository _cards;
    private readonly ICollectionRepository _collection;
    private readonly ILogger<InventoryService> _log;

    public InventoryService(
        SVSimDbContext db,
        IGameConfigService config,
        ICardRepository cards,
        ICollectionRepository collection,
        ILogger<InventoryService> log)
    {
        _db = db;
        _config = config;
        _cards = cards;
        _collection = collection;
        _log = log;
    }

    public async Task<IInventoryTransaction> BeginAsync(
        long viewerId,
        CancellationToken ct = default,
        Action<InventoryLoadConfig>? configure = null)
    {
        var loadCfg = new InventoryLoadConfig();
        configure?.Invoke(loadCfg);

        IQueryable<Viewer> query = _db.Viewers
            .Include(v => v.Cards).ThenInclude(c => c.Card)
            .Include(v => v.Sleeves)
            .Include(v => v.Emblems)
            .Include(v => v.LeaderSkins)
            .Include(v => v.Degrees)
            .Include(v => v.MyPageBackgrounds)
            .Include(v => v.Items).ThenInclude(i => i.Item);

        foreach (var include in loadCfg.Includes)
            query = include(query);

        var viewer = await query
            .AsSplitQuery()
            .FirstOrDefaultAsync(v => v.Id == viewerId, ct)
            ?? throw new InventoryViewerNotFoundException(viewerId);

        var freeplay = _config.Get<FreeplayConfig>();
        var dbTx = await _db.Database.BeginTransactionAsync(ct);

        return new InventoryTransaction(_db, dbTx, viewer, freeplay, _log);
    }

    // Stubs for later tasks.
    public Task<IReadOnlyList<OwnedCardEntry>> EffectiveOwnedCardsAsync(Viewer viewer, CancellationToken ct = default)
        => throw new NotImplementedException();

    public Task<EffectiveCosmetics> EffectiveCosmeticsAsync(Viewer viewer, CancellationToken ct = default)
        => throw new NotImplementedException();

    public long EffectiveBalance(Viewer viewer, SpendCurrency currency)
        => throw new NotImplementedException();
}