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.Delete;
using SIGCM2.Domain.Pricing.ChargeableChars;

namespace SIGCM2.Application.Tests.Pricing.ChargeableChars;

/// <summary>
/// PRC-001 — DeleteChargeableCharConfigCommandHandler tests.
/// Strict TDD — RED written before implementation.
/// Covers: happy path, not-found, audit emission, audit fail-closed.
/// </summary>
public class DeleteChargeableCharConfigHandlerTests
{
    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 DeleteChargeableCharConfigCommandHandler _handler;

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

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

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

    private static DeleteChargeableCharConfigCommand 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);
    }

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

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

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

        await _audit.Received(1).LogAsync(
            action: "tasacion.chargeable_char.delete",
            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(new DeleteChargeableCharConfigCommand(Id: 99L));

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

    // ── 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_DeleteWasCalled_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).DeleteAsync(1L, Arg.Any<CancellationToken>());
    }
}