using Newtonsoft.Json;
using StackExchange.Redis;

namespace BlazorCanvas.Server.Components.Data;

// https://developer.redis.com/develop/dotnet/streams/stream-basics/

public class RedisService: IRedisService {
    private IConnectionMultiplexer _cache;
    private ChannelMessageQueue _channel;

    public RedisService(IConnectionMultiplexer cache) {
        _cache = cache;
        _channel = _cache.GetSubscriber().Subscribe(RedisChannel.Literal("lol"));
    }

    /// <summary>
    /// Version Pub/Sub
    /// </summary>
    public async Task<CanvasCommand?> Subscribe(CancellationToken cToken) {
        var mess = await _channel.ReadAsync(cToken);
        var comm = JsonConvert.DeserializeObject<CanvasCommand>(mess.Message);
        if (comm is not null)
            return comm;
        else return null;
    }

    /// <summary>
    /// Version Pub/Sub
    /// </summary>
    /// <param name="command"></param>
    public async void Publish(CanvasCommand command) {
        CanvasCommand cm = new(command);
        await _cache.GetSubscriber().PublishAsync(_channel.Channel, JsonConvert.SerializeObject(cm));
    }
}