using FluentAssertions;
using IM.Application.Chat.Commands;
using IM.Application.Chat.Handlers;
using IM.Domain.Enums;
using IM.Infrastructure.Persistence;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// CreateGroupCommandHandler 成功路径：建群+会话+成员，群主 Owner 角色，成员去重。
/// </summary>
public class CreateGroupCommandHandlerTests
{
    private static readonly Guid OwnerId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid MemberA = Guid.Parse("33333333-3333-3333-3333-333333333333");
    private static readonly Guid MemberB = Guid.Parse("30000000-0000-0000-0000-000000000001");

    [Fact]
    public async Task Creates_group_with_owner_and_members()
    {
        await using var db = IMTestDb.Create();
        var handler = new CreateGroupCommandHandler(db);
        var result = await handler.Handle(
            new CreateGroupCommand("group-1", null, "desc", OwnerId, new List<Guid> { MemberA, MemberB }),
            CancellationToken.None);

        result.Name.Should().Be("group-1");
        result.OwnerId.Should().Be(OwnerId);
        result.MemberCount.Should().Be(3);
        (await db.Groups.CountAsync()).Should().Be(1);
        (await db.ConversationParticipants.CountAsync(p => p.ConversationId == result.ConversationId)).Should().Be(3);
        (await db.GroupMembers.CountAsync(m => m.GroupId == result.Id && m.Role == GroupMemberRoleEnum.Owner)).Should().Be(1);
    }

    [Fact]
    public async Task Dedups_owner_inside_member_list()
    {
        await using var db = IMTestDb.Create();
        var handler = new CreateGroupCommandHandler(db);
        var result = await handler.Handle(
            new CreateGroupCommand("group-2", null, null, OwnerId, new List<Guid> { OwnerId, MemberA }),
            CancellationToken.None);

        result.MemberCount.Should().Be(2);
        (await db.GroupMembers.CountAsync(m => m.GroupId == result.Id)).Should().Be(2);
    }
}