using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using IM.Application.Chat.Commands;
using IM.Application.Chat.Handlers;
using IM.Domain.Common;
using IM.Domain.Enums;
using IM.Infrastructure.Persistence;
using Microsoft.EntityFrameworkCore;
using Moq;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// MarkConversationUnreadCommandHandler：置未读=1+清空读位点，双写 Redis（Reset+Increment）；
/// 参与者不存在抛 NotFound。
/// </summary>
public class MarkConversationUnreadCommandHandlerTests
{
    private static readonly Guid UserId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid ConvId = Guid.Parse("11111111-1111-1111-1111-111111111111");

    [Fact]
    public async Task Marks_unread_and_calls_redis()
    {
        await using var db = IMTestDb.Create();
        db.Conversations.Add(ImTestData.BuildConversation(ConvId, ConversationTypeEnum.Private, (UserId, 0)));
        await db.SaveChangesAsync();

        var unread = new Mock<IUnreadCounter>();
        var handler = new MarkConversationUnreadCommandHandler(db, unread.Object);
        await handler.Handle(new MarkConversationUnreadCommand(ConvId, UserId), CancellationToken.None);

        var p = await db.ConversationParticipants.FirstAsync(x => x.ConversationId == ConvId && x.UserId == UserId);
        p.UnreadCount.Should().Be(1);
        p.LastReadMessageId.Should().BeNull();
        unread.Verify(c => c.ResetAsync(ConvId, UserId, It.IsAny<CancellationToken>()), Times.Once);
        unread.Verify(c => c.IncrementAsync(ConvId, UserId, 1, It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task Throws_not_found_when_participant_missing()
    {
        await using var db = IMTestDb.Create();
        var unread = new Mock<IUnreadCounter>();
        var handler = new MarkConversationUnreadCommandHandler(db, unread.Object);
        var act = async () => await handler.Handle(new MarkConversationUnreadCommand(ConvId, UserId), CancellationToken.None);

        var ex = await act.Should().ThrowAsync<NotFoundException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }
}