using System.Transactions;
using SIGCM2.Application.Abstractions;
using SIGCM2.Application.Abstractions.Persistence;
using SIGCM2.Application.Audit;

namespace SIGCM2.Application.Pricing.ChargeableChars.Create;

/// <summary>
/// PRC-001 — Handler for CreateChargeableCharConfigCommand.
/// Flow: opens TransactionScope → InsertWithCloseAsync (SP) → IAuditLogger.LogAsync (fail-closed) → tx.Complete().
/// </summary>
public sealed class CreateChargeableCharConfigCommandHandler
    : ICommandHandler<CreateChargeableCharConfigCommand, CreateChargeableCharConfigResponse>
{
    private readonly IChargeableCharConfigRepository _repo;
    private readonly IAuditLogger _audit;
    private readonly TimeProvider _timeProvider;

    public CreateChargeableCharConfigCommandHandler(
        IChargeableCharConfigRepository repo,
        IAuditLogger audit,
        TimeProvider timeProvider)
    {
        _repo = repo;
        _audit = audit;
        _timeProvider = timeProvider;
    }

    public async Task<CreateChargeableCharConfigResponse> Handle(CreateChargeableCharConfigCommand command)
    {
        long newId;
        using (var tx = new TransactionScope(
            TransactionScopeOption.Required,
            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
            TransactionScopeAsyncFlowOption.Enabled))
        {
            newId = await _repo.InsertWithCloseAsync(
                command.MedioId,
                command.Symbol,
                command.Category,
                command.PricePerUnit,
                command.ValidFrom);

            await _audit.LogAsync(
                action: "tasacion.chargeable_char.create",
                targetType: "ChargeableCharConfig",
                targetId: newId.ToString(),
                metadata: new
                {
                    after = new
                    {
                        command.MedioId,
                        command.Symbol,
                        command.Category,
                        command.PricePerUnit,
                        validFrom = command.ValidFrom.ToString("yyyy-MM-dd"),
                    }
                });

            tx.Complete();
        }

        return new CreateChargeableCharConfigResponse(
            newId,
            command.Symbol,
            command.PricePerUnit,
            command.ValidFrom);
    }
}