using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
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>
/// SetConversationPinnedCommandHandler：成功置顶（IsPinned=true, PinnedAt 有值）/ 取消置顶
/// （IsPinned=false, PinnedAt 清空）；参与者不存在抛 NotFound。
/// </summary>
public class SetConversationPinnedCommandHandlerTests
{
    private static readonly Guid UserId = Guid.Parse("22222222-2222-2222-2222-222222222222");
    private static readonly Guid ConvId = Guid.Parse("11111111-1111-1111-1111-111111111111");

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

        var handler = new SetConversationPinnedCommandHandler(db);
        await handler.Handle(new SetConversationPinnedCommand(ConvId, UserId, true), CancellationToken.None);

        var p = await db.ConversationParticipants.FirstAsync(x => x.ConversationId == ConvId && x.UserId == UserId);
        p.IsPinned.Should().BeTrue();
        p.PinnedAt.Should().NotBeNull();
    }

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

        var handler = new SetConversationPinnedCommandHandler(db);
        await handler.Handle(new SetConversationPinnedCommand(ConvId, UserId, false), CancellationToken.None);

        var p = await db.ConversationParticipants.FirstAsync(x => x.ConversationId == ConvId && x.UserId == UserId);
        p.IsPinned.Should().BeFalse();
        p.PinnedAt.Should().BeNull();
    }

    [Fact]
    public async Task Throws_not_found_when_participant_missing()
    {
        await using var db = IMTestDb.Create();
        var handler = new SetConversationPinnedCommandHandler(db);
        var act = async () => await handler.Handle(new SetConversationPinnedCommand(ConvId, UserId, true), CancellationToken.None);

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