webdoorcreator/WebDoorCreator.UI/Controllers/DoorImageController.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using NLog;
using NLog.Fluent;
using WebDoorCreator.Data.Services;
using static System.Net.Mime.MediaTypeNames;

namespace WebDoorCreator.UI.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class DoorImageController : ControllerBase
    {
        #region Public Constructors

        public DoorImageController(IConfiguration configuration, QueueDataService cQDService, WebDoorCreatorService cWDCService)
        {
            Log.Trace("Starting DoorImageController");
            _configuration = configuration;
            WaitReloadSvg = _configuration.GetValue<int>("RuntimeOpt:WaitReloadSvg");
            QDService = cQDService;
            WDService = cWDCService;
            Log.Trace("Avviato DoorImageController");
        }

        #endregion Public Constructors

        private Random rnd = new Random();

        #region Public Methods

        // GET: api/DoorImage
        [HttpGet]
        public string Get()
        {
            return "OK";
        }

        [HttpGet("GetImage.svg")]
        public async Task<IActionResult> GetImage(int DoorId)
        {
            string svgContent = await QDService.DoorGetLastSvg(DoorId);
            // se fosse vuoto...
            if (string.IsNullOrEmpty(svgContent))
            {
                string vetoReq = await QDService.DoorProcVetoGetAsync(DoorId);
                if (string.IsNullOrEmpty(vetoReq))
                {
                    await QDService.DoorProcVetoSetAsync(DoorId, WaitReloadSvg * 20);
                    // richiede ricalcolo img
                    await SendRecalcReq(DoorId);

                    // attende ...
                    await Task.Delay(WaitReloadSvg);
                    // riprova lettura
                    svgContent = await QDService.DoorGetLastSvg(DoorId);
                }
                else
                {
                    // attesa causale per vedere SE riesce a leggere ugualmente...faccio rand (4..10)*wait reload...
                    await Task.Delay(WaitReloadSvg * rnd.Next(4, 10));
                    // riprovo lettura
                    svgContent = await QDService.DoorGetLastSvg(DoorId);
                }
            }
            // se fosse vuoto...
            if (string.IsNullOrEmpty(svgContent))
            {
                // legge img vuota
                svgContent = QDService.DoorGetMissingSvg();
            }
            var result = System.Text.Encoding.UTF8.GetBytes(svgContent);
            return File(result, "image/svg+xml");
        }

        #endregion Public Methods

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();
        private IConfiguration _configuration = null!;
        private int WaitReloadSvg = 100;

        #endregion Private Fields

        #region Private Properties

        private QueueDataService QDService { get; set; } = null!;

        private WebDoorCreatorService WDService { get; set; } = null!;

        #endregion Private Properties

        #region Private Methods

        /// <summary>
        /// Invio richiesta ricalcolo porta
        /// </summary>
        /// <param name="DoorId"></param>
        /// <returns></returns>
        private async Task SendRecalcReq(int DoorId)
        {
            if (DoorId > 0)
            {
                // richiede ricalcolo img
                List<string> doorIdList = new List<string>() { $"{DoorId}" };
                // chiamo reset richieste
                var list2Proc = await QDService.ResetQueueByDoorList(doorIdList);
                await Task.Delay(WaitReloadSvg);

                // recupero DDF ed invio x processing
                string currDDF = await WDService.DoorOpGetDDF(DoorId);
                // versione corrente del DDF generato
                int currVers = await QDService.SendCalcReq(DoorId, currDDF);
                await Task.Delay(WaitReloadSvg);
            }
        }

        #endregion Private Methods

#if false
        [HttpGet("GetImage.png")]
        public async Task<IActionResult> GetImagePng(int DoorId)
        {
            byte[] result = new byte[0];
            string svgContent = await QDataServ.DoorGetLastSvg(DoorId);
            if (!string.IsNullOrEmpty(svgContent))
            {
                var mySvg = SvgDocument.FromSvg<SvgDocument>(svgContent);
                //result = System.Text.Encoding.UTF8.GetBytes(svgContent);
                var myBmp = mySvg.Draw();
                result = Utils.ImageToByte2(myBmp);
            }
            return File(result, "image/png");
        }
#endif
    }
}