using Azure.Messaging.ServiceBus;
using HTEXScreen.Service.AzureRedis;
using Microsoft.Azure.Amqp.Framing;
using Microsoft.Extensions.Caching.Memory;
using System.Net.Http;
using System.Text.Json;
using System.Threading;
using TEAMModelOS.SDK.DI;

namespace HTEXScreen.Service
{
    public class ScreenPDFSub : BackgroundService, IDisposable
    {
        private readonly AzureStorageFactory _azureStorage;
        private readonly HttpClient _httpClient;
        private readonly AzureRedisFactory _azureRedisFactory;
        private readonly AzureCosmosFactory _azureCosmosFactory;
        //消息订阅
        private const string Channel = "screenpdf";
        private readonly    ServiceBusReceiver _receiver;
        public static SpinWait spinWait = new SpinWait(); // 构造SpinWait实例
        public ScreenPDFSub(AzureRedisFactory azureRedisFactory, AzureCosmosFactory azureCosmosFactory, HttpClient httpClient, AzureStorageFactory azureStorage,AzureServiceBusFactory azureService)
        { 
            _receiver = azureService.GetServiceBusClient("Default").CreateReceiver(Channel, new ServiceBusReceiverOptions { ReceiveMode= ServiceBusReceiveMode.PeekLock});
            _httpClient = httpClient;
            _azureStorage = azureStorage;
            _azureRedisFactory = azureRedisFactory;
            _azureCosmosFactory = azureCosmosFactory;
        }

        protected async  override Task ExecuteAsync(CancellationToken stoppingToken)
        {
            while (true) 
            {
                IReadOnlyList<ServiceBusReceivedMessage> receivedMessages = await _receiver.ReceiveMessagesAsync(maxMessages: 1);
                //单条数据 5 分钟未释放。进入死信
                foreach (ServiceBusReceivedMessage receivedMessage in receivedMessages)
                {
                    try
                    {
                        string body = receivedMessage.Body.ToString();
                        ScreenshotDto? screenshot = JsonSerializer.Deserialize<ScreenshotDto>(body);
                        await _receiver.CompleteMessageAsync(receivedMessage);
                        List<(string name ,string url )> urls=  await ScreenService.ScreenshotPdf(screenshot, _azureStorage);
                        await ScreenService.UpdateStuArtPDF(urls.Select(z => z.url), screenshot, _azureRedisFactory, _azureCosmosFactory);
                       
                    } catch
                    {
                        //失败则放回队列死信中 
                        await _receiver.DeadLetterMessageAsync(receivedMessage);
                    }
                }
                //cpu空转一次
                spinWait.SpinOnce();
            } 
        }
    }
}