DigitalData.MessagingService/tests/DigitalData.MessagingService.Tests/Integration/MessagingServiceClientTests.cs

using System.Linq.Expressions;
using System.Text;
using System.Text.Json;
using DigitalData.MessagingService.Application.Common.Dto;
using DigitalData.MessagingService.Application.Common.Interfaces.Repositories;
using DigitalData.MessagingService.Client;
using DigitalData.MessagingService.Client.DependencyInjection;
using DigitalData.MessagingService.Domain.Entities;
using DigitalData.MessagingService.Publisher;
using DigitalData.MessagingService.RabbitMQ;
using Microsoft.Extensions.DependencyInjection;

namespace DigitalData.MessagingService.Tests.Integration;

public sealed class MessagingServiceClientTests : IAsyncDisposable
{
    private const string SenderAddress = "test-flow@digitaldata.works";
    private const string RecipientAddress = "htek0100@gmail.com";

    private readonly ServiceProvider _serviceProvider;
    private readonly MessagingServiceClient _client;
    private readonly RabbitMqConnectionFactory _factory;

    public MessagingServiceClientTests()
    {
        var services = new ServiceCollection();
        services.AddLogging();

        services.AddMessagingServiceClient(LoadLuckyPennySoftLicenseKey(), RabbitMqTestConfig.Apply);
        services.AddSingleton<IRepository<EmailAccount>>(
            new InMemoryEmailAccountRepository(
            [
                new EmailAccount
                {
                    Id = 1,
                    Username = SenderAddress,
                    Password = "ddemail108",
                    SmtpServer = "kundencenter.triplew.de",
                    SmtpPort = 465,
                    SmtpUseSsl = true,
                    UseOAuth2 = false
                }
            ]));

        _serviceProvider = services.BuildServiceProvider();
        _client = _serviceProvider.GetRequiredService<MessagingServiceClient>();
        _factory = _serviceProvider.GetRequiredService<RabbitMqConnectionFactory>();
    }

    /// <summary>
    /// Sends an email through <see cref="MessagingServiceClient"/> using the real RabbitMQ setup.
    /// This test intentionally uses manual mailbox verification because the shared queue can be
    /// consumed by other services during test execution.
    /// </summary>
    [Fact]
    public async Task SendAsync_WithDependencyInjectionAndRealBroker_PublishesExpectedMessage()
    {
        var subject = $"MessagingServiceClient Integration Test {Guid.NewGuid():N}";

        var email = new Email
        {
            From = SenderAddress,
            To = [RecipientAddress],
            Subject = subject,
            Body = "<p>Realistic test mail via MessagingServiceClient.</p>",
            IsHtml = true
        };

        await _client.SendAsync(email);

        Assert.True(true, "Verify in mailbox.");
    }

    private async Task<SendingEmailEvent?> FindMessageBySubjectAsync(string subject, int maxMessages = 100)
    {
        var connection = await _factory.GetDefaultConnectionAsync();
        await using var channel = await connection.CreateChannelAsync();

        var inspectedTags = new List<ulong>();

        for (var i = 0; i < maxMessages; i++)
        {
            var result = await channel.BasicGetAsync(RabbitMqTestConfig.QueueName, autoAck: false);
            if (result is null)
                break;

            inspectedTags.Add(result.DeliveryTag);

            var json = Encoding.UTF8.GetString(result.Body.ToArray());
            var message = JsonSerializer.Deserialize<SendingEmailEvent>(json);
            if (message?.Mail.Subject == subject)
            {
                foreach (var tag in inspectedTags)
                    await channel.BasicNackAsync(tag, multiple: false, requeue: true);

                return message;
            }
        }

        foreach (var tag in inspectedTags)
            await channel.BasicNackAsync(tag, multiple: false, requeue: true);

        return null;
    }

    private static string LoadLuckyPennySoftLicenseKey()
    {
        var appsettingsPath = FindApiAppSettingsPath();
        using var doc = JsonDocument.Parse(File.ReadAllText(appsettingsPath));

        if (doc.RootElement.TryGetProperty("LuckyPennySoftLicenseKey", out var key) &&
            key.ValueKind == JsonValueKind.String &&
            !string.IsNullOrWhiteSpace(key.GetString()))
            return key.GetString()!;

        throw new InvalidOperationException($"LuckyPennySoftLicenseKey not found in '{appsettingsPath}'.");
    }

    private static string FindApiAppSettingsPath()
    {
        var current = new DirectoryInfo(AppContext.BaseDirectory);

        while (current is not null)
        {
            var candidate = Path.Combine(current.FullName, "src", "presentation", "DigitalData.MessagingService.API", "appsettings.json");
            if (File.Exists(candidate))
                return candidate;

            current = current.Parent;
        }

        throw new FileNotFoundException("Could not locate API appsettings.json from test output directory.");
    }

    public async ValueTask DisposeAsync()
    {
        await _factory.DisposeAsync();
        await _serviceProvider.DisposeAsync();
    }

    private sealed class InMemoryEmailAccountRepository(IEnumerable<EmailAccount> accounts) : IRepository<EmailAccount>
    {
        private readonly List<EmailAccount> _accounts = accounts.ToList();

        public Task<IEnumerable<EmailAccount>> FindAsync(Expression<Func<EmailAccount, bool>> predicate, int? skip = null, int? take = null, CancellationToken cancellationToken = default)
        {
            var query = _accounts.AsQueryable().Where(predicate);
            if (skip.HasValue)
                query = query.Skip(skip.Value);
            if (take.HasValue)
                query = query.Take(take.Value);

            return Task.FromResult<IEnumerable<EmailAccount>>(query.ToList());
        }

        public Task<EmailAccount> CreateAsync<TDto>(TDto dto, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<IEnumerable<EmailAccount>> CreateRangeAsync<TDto>(IEnumerable<TDto> dtos, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<EmailAccount?> GetByIdAsync(int id, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<IEnumerable<EmailAccount>> GetAllAsync(CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<EmailAccount?> FindFirstAsync(Expression<Func<EmailAccount, bool>> predicate, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<EmailAccount?> FindSingleAsync(Expression<Func<EmailAccount, bool>> predicate, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<int> CountAsync(Expression<Func<EmailAccount, bool>>? predicate = null, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<bool> AnyAsync(Expression<Func<EmailAccount, bool>> predicate, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<(EmailAccount Entity, bool Created)> UpsertAsync<TDto>(Expression<Func<EmailAccount, bool>> predicate, TDto dto, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<(EmailAccount Entity, bool Created)> UpsertSingleAsync<TDto>(Expression<Func<EmailAccount, bool>> predicate, TDto dto, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task UpdateSingleAsync<TDto>(Expression<Func<EmailAccount, bool>> predicate, TDto dto, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<int> UpdateAsync<TDto>(Expression<Func<EmailAccount, bool>> predicate, TDto dto, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task DeleteSingleAsync(Expression<Func<EmailAccount, bool>> predicate, CancellationToken cancellationToken = default) => throw new NotSupportedException();
        public Task<int> DeleteAsync(Expression<Func<EmailAccount, bool>> predicate, CancellationToken cancellationToken = default) => throw new NotSupportedException();
    }
}