using Application.Abstractions.Data;
using Application.Abstractions.Hub;
using Application.Abstractions.Messaging;
using Application.Abstractions.YouTube;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Admin.Channel.YouTubePubSub.ForceOffline;

internal sealed class Handler(
    IAppDbContext db,
    IYouTubeLiveStateStore liveStateStore,
    IChannelStatusBroadcaster broadcaster
) : ICommandHandler<Command, Result>
{
    public async Task<Result> Handle(Command request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.YouTubeChannelID))
        {
            return Result.Failure(Error.Problem("ForceOffline.Invalid", "YouTube Channel ID 가 필요합니다."));
        }

        var channel = await db.Channel.AsNoTracking()
            .FirstOrDefaultAsync(c => c.YouTubeChannelID == request.YouTubeChannelID, ct);

        if (channel is null)
        {
            return Result.Failure(Error.NotFound("ForceOffline.ChannelNotFound", "내부 Channel 을 찾을 수 없습니다."));
        }

        await liveStateStore.ClearLiveAsync(request.YouTubeChannelID);
        await broadcaster.BroadcastAsync(channel.SID, isLive: false, viewerCount: 0, videoId: null, ct);

        return Result.Success();
    }
}