using FluentAssertions;
using foodmarket.Application.Common.Fiscal;
using foodmarket.Domain.Sales;
using foodmarket.Infrastructure.Fiscal;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

namespace foodmarket.UnitTests;

/// <summary>Контракт MockFiscalProvider'а: возвращает префикс MOCK-, тот же
/// чек двумя вызовами даёт тот же FiscalNumber (идемпотентность), QR содержит
/// FiscalNumber, ProviderTxId не пуст. SimulatedLatency обнулена — тест
/// должен быть мгновенным.</summary>
public class FiscalMockProviderTests
{
    private static MockFiscalProvider New() => new(NullLogger<MockFiscalProvider>.Instance)
    {
        SimulatedLatency = TimeSpan.Zero,
    };

    private static RetailSale SaleStub(Guid? id = null) => new()
    {
        Id = id ?? Guid.NewGuid(),
        Number = "TST-000001",
        OrganizationId = Guid.NewGuid(),
        StoreId = Guid.NewGuid(),
        CurrencyId = Guid.NewGuid(),
        Total = 1000m,
    };

    [Fact]
    public void Kind_is_Mock()
        => New().Kind.Should().Be(FiscalProviderKind.Mock);

    [Fact]
    public async Task Register_returns_mock_prefixed_fiscal_number()
    {
        var sale = SaleStub();
        var r = await New().RegisterAsync(sale, CancellationToken.None);
        r.FiscalNumber.Should().StartWith("MOCK-").And.HaveLength("MOCK-".Length + 8);
        r.FiscalQrCode.Should().Contain(r.FiscalNumber);
        r.FiscalUrl.Should().StartWith("https://mock.ofd.local/check/");
        r.ProviderTxId.Should().NotBeNullOrEmpty().And.StartWith("mock-tx-");
    }

    [Fact]
    public async Task Register_is_idempotent_per_sale_id()
    {
        var id = Guid.NewGuid();
        var r1 = await New().RegisterAsync(SaleStub(id), CancellationToken.None);
        var r2 = await New().RegisterAsync(SaleStub(id), CancellationToken.None);
        r1.FiscalNumber.Should().Be(r2.FiscalNumber);
        r1.ProviderTxId.Should().Be(r2.ProviderTxId);
    }

    [Fact]
    public async Task Different_sales_get_different_fiscal_numbers()
    {
        var a = await New().RegisterAsync(SaleStub(), CancellationToken.None);
        var b = await New().RegisterAsync(SaleStub(), CancellationToken.None);
        a.FiscalNumber.Should().NotBe(b.FiscalNumber);
    }

    [Fact]
    public async Task Simulated_latency_actually_delays()
    {
        var prov = new MockFiscalProvider(NullLogger<MockFiscalProvider>.Instance)
        {
            SimulatedLatency = TimeSpan.FromMilliseconds(150),
        };
        var sw = System.Diagnostics.Stopwatch.StartNew();
        await prov.RegisterAsync(SaleStub(), CancellationToken.None);
        sw.Stop();
        sw.ElapsedMilliseconds.Should().BeGreaterThanOrEqualTo(140);
    }
}