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 Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// DeleteGroupCommandHandler：群不存在 NotFound；非群主 Business；群主解散成功（记录不可再查得）。
/// </summary>
public class DeleteGroupCommandHandlerTests
{
    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 DeleteGroupCommandHandler(db);
        var act = async () => await handler.Handle(new DeleteGroupCommand(Guid.NewGuid(), OwnerId), CancellationToken.None);

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

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

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

    [Fact]
    public async Task Owner_deletes_group()
    {
        await using var db = IMTestDb.Create();
        var (_, groupId) = await IMTestDb.SeedGroupAsync(db, Name, OwnerId, MemberId);
        var handler = new DeleteGroupCommandHandler(db);
        await handler.Handle(new DeleteGroupCommand(groupId, OwnerId), CancellationToken.None);

        (await db.Groups.AnyAsync(g => g.Id == groupId)).Should().BeFalse();
    }
}