using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Telegram.Bot;
using Telegram.Bot.Polling;
using Telegrator.Core;
using Telegrator.Mediation;

namespace Telegrator.Polling
{
    /// <summary>
    /// Service for receiving updates for Hosted telegram bots
    /// </summary>
    /// <param name="botClient"></param>
    /// <param name="updateRouter"></param>
    /// <param name="options"></param>
    /// <param name="logger"></param>
    public class HostedUpdateReceiver(ITelegramBotClient botClient, IUpdateRouter updateRouter, IOptions<ReceiverOptions> options, ILogger<HostedUpdateReceiver> logger) : BackgroundService
    {
        private readonly ReceiverOptions _receiverOptions = options.Value;
        private readonly IUpdateRouter _updateRouter = updateRouter;

        /// <inheritdoc/>
        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            logger.LogInformation("Starting receiving updates via long-polling");
            _receiverOptions.AllowedUpdates = _updateRouter.HandlersProvider.AllowedTypes.ToArray();
            DefaultUpdateReceiver updateReceiver = new DefaultUpdateReceiver(botClient, _receiverOptions);
            await updateReceiver.ReceiveAsync(_updateRouter, stoppingToken).ConfigureAwait(false);
        }
    }
}