using MiaoJiZhang.Infrastructure.Persistence;
using Microsoft.EntityFrameworkCore;

namespace MiaoJiZhang.Api.Services;

public class LedgerResolver(AppDbContext db)
{
    public async Task<long?> ResolveAsync(
        long userId,
        long? requestedLedgerId,
        CancellationToken ct = default)
    {
        if (requestedLedgerId.HasValue)
        {
            return await db.Ledgers
                .Where(l => l.Id == requestedLedgerId.Value && l.OwnerId == userId)
                .Select(l => (long?)l.Id)
                .FirstOrDefaultAsync(ct);
        }

        return await db.Ledgers
            .Where(l => l.OwnerId == userId && l.IsDefault)
            .Select(l => (long?)l.Id)
            .FirstOrDefaultAsync(ct);
    }
}