using IM.Application.Chat.Handlers;
using IM.Application.Chat.Queries;
using IM.Domain.Common;
using IM.Domain.Enums;
using IM.Infrastructure.Persistence;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Moq;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// GetUnreadCountQueryHandler 的读扩散断言：Redis 命中必须能独立驱动未读汇总。
/// </summary>
public class GetUnreadCountQueryHandlerTests
{
    private static readonly Guid UserId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid OtherUserId = Guid.Parse("33333333-3333-3333-3333-333333333333");
    private static readonly Guid ConversationId = Guid.Parse("11111111-1111-1111-1111-111111111111");

    [Fact]
    public async Task Returns_redis_unread_even_when_pg_cold_backup_is_zero()
    {
        await using var db = BuildInMemoryDb();
        db.Conversations.Add(ImTestData.BuildConversation(
            ConversationId,
            ConversationType.Private,
            (UserId, 0),
            (OtherUserId, 0)));
        await db.SaveChangesAsync();

        var unreadCounter = new Mock<IUnreadCounter>();
        unreadCounter
            .Setup(c => c.GetByUserAsync(
                UserId,
                It.Is<IEnumerable<Guid>>(ids => ids.SequenceEqual(new[] { ConversationId })),
                It.IsAny<CancellationToken>()))
            .ReturnsAsync(new Dictionary<Guid, int> { [ConversationId] = 3 });

        var handler = new GetUnreadCountQueryHandler(db, unreadCounter.Object);

        var result = await handler.Handle(new GetUnreadCountQuery(UserId), CancellationToken.None);

        Assert.Equal(3, result.Total);
        var item = Assert.Single(result.Items);
        Assert.Equal(ConversationId, item.ConversationId);
        Assert.Equal(3, item.UnreadCount);
    }

    private static ImDbContext BuildInMemoryDb()
    {
        var services = new ServiceCollection();
        services.AddDbContext<ImDbContext>(o => o.UseInMemoryDatabase($"im-unread-{Guid.NewGuid()}"));
        return services.BuildServiceProvider().GetRequiredService<ImDbContext>();
    }
}