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

namespace SIGCM2.Application.Pricing.ChargeableChars.Deactivate;

/// <summary>
/// PRC-001 — Handler for DeactivateChargeableCharConfigCommand.
/// Flow: load existing → open TX → DeactivateAsync → audit → tx.Complete().
/// </summary>
public sealed class DeactivateChargeableCharConfigCommandHandler
    : ICommandHandler<DeactivateChargeableCharConfigCommand, DeactivateChargeableCharConfigResponse>
{
    private readonly IChargeableCharConfigRepository _repo;
    private readonly IAuditLogger _audit;
    private readonly TimeProvider _timeProvider;

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

    public async Task<DeactivateChargeableCharConfigResponse> Handle(
        DeactivateChargeableCharConfigCommand command)
    {
        var today = _timeProvider.GetArgentinaToday();

        // 1. Load existing — ensures the row exists.
        var existing = await _repo.GetByIdAsync(command.Id)
            ?? throw new KeyNotFoundException($"ChargeableCharConfig con Id={command.Id} no existe.");

        // 2. TX + deactivate + audit (fail-closed).
        using (var tx = new TransactionScope(
            TransactionScopeOption.Required,
            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
            TransactionScopeAsyncFlowOption.Enabled))
        {
            await _repo.DeactivateAsync(command.Id, today);

            await _audit.LogAsync(
                action: "tasacion.chargeable_char.deactivate",
                targetType: "ChargeableCharConfig",
                targetId: command.Id.ToString(),
                metadata: new
                {
                    before = new
                    {
                        id = existing.Id,
                        symbol = existing.Symbol,
                        productTypeId = existing.ProductTypeId,
                        validFrom = existing.ValidFrom.ToString("yyyy-MM-dd"),
                    },
                    deactivatedOn = today.ToString("yyyy-MM-dd"),
                });

            tx.Complete();
        }

        return new DeactivateChargeableCharConfigResponse(
            Id: command.Id,
            ValidTo: today);
    }
}