food-market/src/food-market.infrastructure/Persistence/Configurations/MoneyConfigurations.cs

using foodmarket.Domain.Money;
using Microsoft.EntityFrameworkCore;

namespace foodmarket.Infrastructure.Persistence.Configurations;

/// <summary>Схема таблиц модуля «Деньги». Названия колонок/таблиц
/// подчинены общему стилю (snake_case через ToTable + EF-camel для свойств);
/// суммовые — <c>decimal(18,4)</c>; концуррентный токен — Postgres <c>xmin</c>.</summary>
public static class MoneyConfigurations
{
    public static void ConfigureMoney(this ModelBuilder b)
    {
        b.Entity<MoneyAccount>(e =>
        {
            e.ToTable("money_accounts");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Name).HasMaxLength(200).IsRequired();
            e.Property(x => x.BankName).HasMaxLength(200);
            e.Property(x => x.AccountNumber).HasMaxLength(100);
            e.Property(x => x.OpeningBalance).HasPrecision(18, 4);

            e.HasOne(x => x.Store).WithMany().HasForeignKey(x => x.StoreId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Currency).WithMany().HasForeignKey(x => x.CurrencyId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.OrganizationId, x.Name });
            e.HasIndex(x => new { x.OrganizationId, x.Kind, x.IsActive });
            // IsDefault — на уровне контроллера проверяем «только один per Kind»:
            // составной уникальный индекс с фильтром IsDefault=true.
            e.HasIndex(x => new { x.OrganizationId, x.Kind })
                .IsUnique()
                .HasFilter("\"IsDefault\" = true");
        });

        b.Entity<ExpenseItem>(e =>
        {
            e.ToTable("expense_items");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Name).HasMaxLength(200).IsRequired();
            e.Property(x => x.Code).HasMaxLength(50);
            e.Property(x => x.Notes).HasMaxLength(1000);
            e.HasIndex(x => new { x.OrganizationId, x.Name }).IsUnique();
            e.HasIndex(x => new { x.OrganizationId, x.Code })
                .IsUnique()
                .HasFilter("\"Code\" IS NOT NULL");
        });

        b.Entity<MoneyTransaction>(e =>
        {
            e.ToTable("money_transactions");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Number).HasMaxLength(50).IsRequired();
            e.Property(x => x.Amount).HasPrecision(18, 4);
            e.Property(x => x.Purpose).HasMaxLength(500);
            e.Property(x => x.Notes).HasMaxLength(1000);

            e.HasOne(x => x.Account).WithMany().HasForeignKey(x => x.AccountId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Counterparty).WithMany().HasForeignKey(x => x.CounterpartyId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.ExpenseItem).WithMany().HasForeignKey(x => x.ExpenseItemId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.Currency).WithMany().HasForeignKey(x => x.CurrencyId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.LinkedTransaction).WithMany()
                .HasForeignKey(x => x.LinkedTransactionId).OnDelete(DeleteBehavior.Restrict);

            e.HasMany(x => x.Links).WithOne(l => l.Transaction)
                .HasForeignKey(l => l.TransactionId).OnDelete(DeleteBehavior.Cascade);

            e.HasIndex(x => new { x.OrganizationId, x.Number }).IsUnique();
            e.HasIndex(x => new { x.OrganizationId, x.Date });
            e.HasIndex(x => new { x.OrganizationId, x.Kind, x.Status });
            e.HasIndex(x => new { x.OrganizationId, x.AccountId, x.Date });
            e.HasIndex(x => new { x.OrganizationId, x.CounterpartyId })
                .HasFilter("\"CounterpartyId\" IS NOT NULL");
        });

        b.Entity<MoneyTransactionLink>(e =>
        {
            e.ToTable("money_transaction_links");
            e.Property(x => x.LinkedSum).HasPrecision(18, 4);

            e.HasOne(x => x.Supply).WithMany().HasForeignKey(x => x.SupplyId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.SupplierReturn).WithMany().HasForeignKey(x => x.SupplierReturnId).OnDelete(DeleteBehavior.Restrict);

            // CHECK: ровно одна целевая ссылка должна быть заполнена.
            e.ToTable(t => t.HasCheckConstraint(
                "ck_money_link_single_target",
                "((\"SupplyId\" IS NOT NULL)::int + (\"SupplierReturnId\" IS NOT NULL)::int) = 1"));

            e.HasIndex(x => new { x.OrganizationId, x.SupplyId })
                .HasFilter("\"SupplyId\" IS NOT NULL");
            e.HasIndex(x => new { x.OrganizationId, x.SupplierReturnId })
                .HasFilter("\"SupplierReturnId\" IS NOT NULL");
            e.HasIndex(x => x.TransactionId);
        });

        b.Entity<CashShift>(e =>
        {
            e.ToTable("cash_shifts");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Number).HasMaxLength(50).IsRequired();
            e.Property(x => x.OpeningFloat).HasPrecision(18, 4);
            e.Property(x => x.SalesCash).HasPrecision(18, 4);
            e.Property(x => x.SalesCard).HasPrecision(18, 4);
            e.Property(x => x.ReturnsCash).HasPrecision(18, 4);
            e.Property(x => x.ReturnsCard).HasPrecision(18, 4);
            e.Property(x => x.DrawerIn).HasPrecision(18, 4);
            e.Property(x => x.DrawerOut).HasPrecision(18, 4);
            e.Property(x => x.ExpectedCash).HasPrecision(18, 4);
            e.Property(x => x.ActualCash).HasPrecision(18, 4);
            e.Property(x => x.CashDifference).HasPrecision(18, 4);
            e.Property(x => x.Notes).HasMaxLength(1000);

            e.HasOne(x => x.RetailPoint).WithMany().HasForeignKey(x => x.RetailPointId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.CashAccount).WithMany().HasForeignKey(x => x.CashAccountId).OnDelete(DeleteBehavior.Restrict);
            e.HasOne(x => x.AcquiringAccount).WithMany().HasForeignKey(x => x.AcquiringAccountId).OnDelete(DeleteBehavior.Restrict);

            e.HasMany(x => x.DrawerOperations).WithOne(d => d.CashShift)
                .HasForeignKey(d => d.CashShiftId).OnDelete(DeleteBehavior.Cascade);

            e.HasIndex(x => new { x.OrganizationId, x.Number }).IsUnique();
            e.HasIndex(x => new { x.OrganizationId, x.OpenedAt });
            e.HasIndex(x => new { x.OrganizationId, x.RetailPointId, x.Status });
            // Только одна открытая смена per RetailPoint.
            e.HasIndex(x => new { x.OrganizationId, x.RetailPointId })
                .IsUnique()
                .HasFilter("\"Status\" = 1");
        });

        b.Entity<CashDrawerOperation>(e =>
        {
            e.ToTable("cash_drawer_operations");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Amount).HasPrecision(18, 4);
            e.Property(x => x.Reason).HasMaxLength(500).IsRequired();
            e.HasIndex(x => new { x.OrganizationId, x.CashShiftId });
            e.HasIndex(x => new { x.OrganizationId, x.At });
        });

        b.Entity<CounterpartyAdjustment>(e =>
        {
            e.ToTable("counterparty_adjustments");
            e.UseXminAsConcurrencyToken();
            e.Ignore(x => x.Xmin);
            e.Property(x => x.Number).HasMaxLength(50).IsRequired();
            e.Property(x => x.Amount).HasPrecision(18, 4);
            e.Property(x => x.Notes).HasMaxLength(1000);

            e.HasOne(x => x.Counterparty).WithMany().HasForeignKey(x => x.CounterpartyId).OnDelete(DeleteBehavior.Restrict);

            e.HasIndex(x => new { x.OrganizationId, x.Number }).IsUnique();
            e.HasIndex(x => new { x.OrganizationId, x.Date });
            e.HasIndex(x => new { x.OrganizationId, x.CounterpartyId, x.Status });
        });

        // Расширения существующих таблиц:
        b.Entity<foodmarket.Domain.Purchases.Supply>(e =>
        {
            e.Property(x => x.PayedSum).HasPrecision(18, 4);
            e.HasIndex(x => new { x.OrganizationId, x.SupplierId, x.Status, x.PayedSum });
        });

        b.Entity<foodmarket.Domain.Purchases.SupplierReturn>(e =>
        {
            e.Property(x => x.PayedSum).HasPrecision(18, 4);
        });

        b.Entity<foodmarket.Domain.Sales.RetailSale>(e =>
        {
            e.HasIndex(x => new { x.OrganizationId, x.CashShiftId })
                .HasFilter("\"CashShiftId\" IS NOT NULL");
        });
    }
}