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

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// UpdateGroupCommandHandler：群不存在 NotFound；普通成员改群信息 Business；群主改群名成功。
/// </summary>
public class UpdateGroupCommandHandlerTests
{
    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 UpdateGroupCommandHandler(db);
        var act = async () => await handler.Handle(new UpdateGroupCommand(Guid.NewGuid(), OwnerId, "x", null, null), CancellationToken.None);

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

    [Fact]
    public async Task Throws_business_when_operator_is_member()
    {
        await using var db = IMTestDb.Create();
        var (_, groupId) = await IMTestDb.SeedGroupAsync(db, Name, OwnerId, MemberId);
        var handler = new UpdateGroupCommandHandler(db);
        var act = async () => await handler.Handle(new UpdateGroupCommand(groupId, MemberId, "new", null, null), CancellationToken.None);

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

    [Fact]
    public async Task Owner_updates_name()
    {
        await using var db = IMTestDb.Create();
        var (_, groupId) = await IMTestDb.SeedGroupAsync(db, Name, OwnerId, MemberId);
        var handler = new UpdateGroupCommandHandler(db);
        var result = await handler.Handle(new UpdateGroupCommand(groupId, OwnerId, "renamed", null, null), CancellationToken.None);

        result.Name.Should().Be("renamed");
        var g = await db.Groups.FindAsync(groupId);
        g.Should().NotBeNull();
        g!.Name.Should().Be("renamed");
    }
}