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

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// GetGroupQueryHandler：群不存在 NotFound；非成员拒绝（Forbidden）；成员返回群详情。
/// </summary>
public class GetGroupQueryHandlerTests
{
    private static readonly Guid OwnerId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid MemberId = Guid.Parse("33333333-3333-3333-3333-333333333333");
    private const string Name = "group-1";

    [Fact]
    public async Task Throws_not_found_when_group_missing()
    {
        await using var db = IMTestDb.Create();
        var handler = new GetGroupQueryHandler(db);
        var act = async () => await handler.Handle(new GetGroupQuery(Guid.NewGuid(), OwnerId), CancellationToken.None);

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

    [Fact]
    public async Task Throws_forbidden_when_not_member()
    {
        await using var db = IMTestDb.Create();
        var (_, groupId) = await IMTestDb.SeedGroupAsync(db, Name, OwnerId, MemberId);
        var handler = new GetGroupQueryHandler(db);
        var act = async () => await handler.Handle(new GetGroupQuery(groupId, Guid.NewGuid()), CancellationToken.None);

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

    [Fact]
    public async Task Returns_group_for_member()
    {
        await using var db = IMTestDb.Create();
        var (_, groupId) = await IMTestDb.SeedGroupAsync(db, Name, OwnerId, MemberId);
        var handler = new GetGroupQueryHandler(db);

        var result = await handler.Handle(new GetGroupQuery(groupId, OwnerId), CancellationToken.None);

        result.Id.Should().Be(groupId);
        result.Name.Should().Be(Name);
        result.OwnerId.Should().Be(OwnerId);
    }
}