using FluentAssertions;
using Microsoft.Extensions.Time.Testing;
using NSubstitute;
using NSubstitute.ExceptionExtensions;
using SIGCM2.Application.Abstractions.Persistence;
using SIGCM2.Application.Audit;
using SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
using SIGCM2.Domain.Pricing.ChargeableChars;

namespace SIGCM2.Application.Tests.Pricing.ChargeableChars;

/// <summary>
/// PRC-001 — DeactivateChargeableCharConfigCommandHandler tests.
/// Covers: happy path, not-found, audit emit, audit fail → rollback.
/// </summary>
public class DeactivateChargeableCharConfigHandlerTests
{
    private readonly FakeTimeProvider _time = new(new DateTimeOffset(2026, 4, 20, 12, 0, 0, TimeSpan.Zero));
    private readonly IChargeableCharConfigRepository _repo = Substitute.For<IChargeableCharConfigRepository>();
    private readonly IAuditLogger _audit = Substitute.For<IAuditLogger>();
    private readonly DeactivateChargeableCharConfigCommandHandler _handler;

    private static readonly DateOnly Today = new(2026, 4, 20);

    private static ChargeableCharConfig ActiveConfig() =>
        ChargeableCharConfig.Rehydrate(1L, null, "$", ChargeableCharCategories.Currency, 1.0m, Today, null, true);

    public DeactivateChargeableCharConfigHandlerTests()
    {
        _repo.GetByIdAsync(1L, Arg.Any<CancellationToken>())
            .Returns(ActiveConfig());

        _handler = new DeactivateChargeableCharConfigCommandHandler(_repo, _audit, _time);
    }

    private static DeactivateChargeableCharConfigCommand ValidCmd() => new(Id: 1L);

    // ── Happy path ──────────────────────────────────────────────────────────────

    [Fact]
    public async Task Handle_HappyPath_ReturnsDeactivateResponse()
    {
        var result = await _handler.Handle(ValidCmd());

        result.Should().NotBeNull();
        result.Id.Should().Be(1L);
        result.ValidTo.Should().Be(Today);
    }

    [Fact]
    public async Task Handle_HappyPath_CallsDeactivateAsync()
    {
        await _handler.Handle(ValidCmd());

        await _repo.Received(1).DeactivateAsync(1L, Today, Arg.Any<CancellationToken>());
    }

    [Fact]
    public async Task Handle_HappyPath_EmitsAuditDeactivate()
    {
        await _handler.Handle(ValidCmd());

        await _audit.Received(1).LogAsync(
            action: "tasacion.chargeable_char.deactivate",
            targetType: "ChargeableCharConfig",
            targetId: "1",
            metadata: Arg.Any<object?>(),
            ct: Arg.Any<CancellationToken>());
    }

    // ── Not found ───────────────────────────────────────────────────────────────

    [Fact]
    public async Task Handle_ConfigNotFound_ThrowsKeyNotFoundException()
    {
        _repo.GetByIdAsync(99L, Arg.Any<CancellationToken>())
            .Returns((ChargeableCharConfig?)null);

        var act = async () => await _handler.Handle(ValidCmd() with { Id = 99L });

        await act.Should().ThrowAsync<KeyNotFoundException>();
    }

    // ── Audit fail → rollback ───────────────────────────────────────────────────

    [Fact]
    public async Task Handle_AuditThrows_ExceptionPropagates()
    {
        _audit.LogAsync(
                Arg.Any<string>(), Arg.Any<string>(), Arg.Any<string>(),
                Arg.Any<object?>(), Arg.Any<CancellationToken>())
            .ThrowsAsync(new InvalidOperationException("Audit error"));

        var act = async () => await _handler.Handle(ValidCmd());

        await act.Should().ThrowAsync<InvalidOperationException>()
            .WithMessage("Audit error");
    }

    [Fact]
    public async Task Handle_AuditThrows_DeactivateWasCalled_TransactionNotCompleted()
    {
        _audit.LogAsync(
                Arg.Any<string>(), Arg.Any<string>(), Arg.Any<string>(),
                Arg.Any<object?>(), Arg.Any<CancellationToken>())
            .ThrowsAsync(new InvalidOperationException("Audit error"));

        var act = async () => await _handler.Handle(ValidCmd());
        await act.Should().ThrowAsync<InvalidOperationException>();

        // Repo.DeactivateAsync was called but TX not completed (exception propagated)
        await _repo.Received(1).DeactivateAsync(1L, Today, Arg.Any<CancellationToken>());
    }
}