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.Reactivate;
using SIGCM2.Domain.Pricing.ChargeableChars;
using SIGCM2.Domain.Pricing.Exceptions;

namespace SIGCM2.Application.Tests.Pricing.ChargeableChars;

/// <summary>
/// PRC-001 — ReactivateChargeableCharConfigCommandHandler tests.
/// Strict TDD — RED written before implementation.
/// Covers: happy path, audit emission, audit fail-closed, repo exception propagation.
/// </summary>
public class ReactivateChargeableCharConfigHandlerTests
{
    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 ReactivateChargeableCharConfigCommandHandler _handler;

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

    private static ChargeableCharConfig ClosedConfig() =>
        ChargeableCharConfig.Rehydrate(
            id: 1L, productTypeId: null, symbol: "$", category: ChargeableCharCategories.Currency,
            price: 1.5m, validFrom: new DateOnly(2026, 1, 1), validTo: new DateOnly(2026, 4, 19), isActive: false);

    private static ChargeableCharConfig ActiveConfig() =>
        ChargeableCharConfig.Rehydrate(
            id: 1L, productTypeId: null, symbol: "$", category: ChargeableCharCategories.Currency,
            price: 1.5m, validFrom: new DateOnly(2026, 1, 1), validTo: null, isActive: true);

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

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

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

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

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

        result.Should().NotBeNull();
        result.Id.Should().Be(1L);
        result.Symbol.Should().Be("$");
        result.IsActive.Should().BeTrue();
    }

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

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

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

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

    // ── Guard failures propagate ────────────────────────────────────────────────

    [Fact]
    public async Task Handle_AlreadyActive_ThrowsReactivationNotAllowed()
    {
        _repo.ReactivateAsync(2L, Arg.Any<CancellationToken>())
            .ThrowsAsync(new ChargeableCharConfigReactivationNotAllowedException(2L, "ALREADY_ACTIVE"));

        var act = async () => await _handler.Handle(new ReactivateChargeableCharConfigCommand(Id: 2L));

        await act.Should().ThrowAsync<ChargeableCharConfigReactivationNotAllowedException>()
            .Where(e => e.Reason == "ALREADY_ACTIVE");
    }

    [Fact]
    public async Task Handle_VigenteExists_ThrowsReactivationNotAllowed()
    {
        _repo.ReactivateAsync(3L, Arg.Any<CancellationToken>())
            .ThrowsAsync(new ChargeableCharConfigReactivationNotAllowedException(3L, "VIGENTE_EXISTS"));

        var act = async () => await _handler.Handle(new ReactivateChargeableCharConfigCommand(Id: 3L));

        await act.Should().ThrowAsync<ChargeableCharConfigReactivationNotAllowedException>()
            .Where(e => e.Reason == "VIGENTE_EXISTS");
    }

    [Fact]
    public async Task Handle_PosteriorRowsExist_ThrowsReactivationNotAllowed()
    {
        _repo.ReactivateAsync(4L, Arg.Any<CancellationToken>())
            .ThrowsAsync(new ChargeableCharConfigReactivationNotAllowedException(4L, "POSTERIOR_ROWS_EXIST"));

        var act = async () => await _handler.Handle(new ReactivateChargeableCharConfigCommand(Id: 4L));

        await act.Should().ThrowAsync<ChargeableCharConfigReactivationNotAllowedException>()
            .Where(e => e.Reason == "POSTERIOR_ROWS_EXIST");
    }

    // ── Audit fail → rollback (fail-closed) ─────────────────────────────────────

    [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 down"));

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

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

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

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

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