using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using IM.Application.Chat.Handlers;
using IM.Application.Chat.Queries;
using IM.Domain.Enums;
using IM.Infrastructure.Persistence;
using MediatR;
using Moq;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// SearchMessagesQueryHandler：主路径依赖 MongoDB（DB.Default），此处仅覆盖"依赖调用之前"的两个分支——
/// 非参与者拒绝（Forbidden）、空白关键字直接返回空结果（不触 Mongo）。
/// </summary>
public class SearchMessagesQueryHandlerTests
{
    private static readonly Guid UserId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid Other = Guid.Parse("33333333-3333-3333-3333-333333333333");
    private static readonly Guid ConvId = Guid.Parse("11111111-1111-1111-1111-111111111111");

    [Fact]
    public async Task Throws_forbidden_when_not_participant()
    {
        await using var db = IMTestDb.Create();
        var handler = new SearchMessagesQueryHandler(db, new Mock<IMediator>().Object);
        var act = async () => await handler.Handle(new SearchMessagesQuery(UserId, ConvId, "hello"), CancellationToken.None);

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

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

        var handler = new SearchMessagesQueryHandler(db, new Mock<IMediator>().Object);
        var result = await handler.Handle(new SearchMessagesQuery(UserId, ConvId, "   "), CancellationToken.None);

        result.Messages.Should().BeEmpty();
        result.HasMore.Should().BeFalse();
    }
}