webdoorcreator/WebDoorCreator.API/Controllers/DoorImageController.cs

using Microsoft.AspNetCore.Mvc;
using NLog;
using SkiaSharp;
using Svg;
using Svg.Skia;
using System.Drawing;
using WebDoorCreator.Data.Services;

#if false
using SkiaSharp;
using Svg.Skia;
#endif

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

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

        #endregion Public Constructors

        #region Public Methods

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

        [HttpGet("GetImage.png")]
        public async Task<IActionResult> GetImagePng(int DoorId)
        {
            byte[] result = new byte[0];
            string svgContent = await QDService.DoorGetLastSvg(DoorId);
            // se fosse vuoto...
            if (string.IsNullOrEmpty(svgContent))
            {
                // richiede ricalcolo img
                svgContent = await SendRecalcReq(DoorId);
            }
            // se fosse vuoto...
            if (string.IsNullOrEmpty(svgContent))
            {
                // legge img vuota
                svgContent = QDService.DoorGetMissingSvg();
            }
            // ora prosegue con conversione...
            if (!string.IsNullOrEmpty(svgContent))
            {
                using (var svg = new SKSvg())
                {
                    if (svg.FromSvg(svgContent) is { })
                    {
                        using (var stream = new MemoryStream())
                        {
                            svg.Picture?.ToImage(stream, SKColors.Empty, SKEncodedImageFormat.Png, 100, 1f, 1f, SKColorType.Rgba8888, SKAlphaType.Unpremul, SKColorSpace.CreateSrgb());
                            result = stream.ToArray();
                        }
                    }
                }
#if false
                    var mySvg = SvgDocument.FromSvg<SvgDocument>(svgContent);
                    //result = System.Text.Encoding.UTF8.GetBytes(svgContent);
                    var myBmp = mySvg.Draw();
                    using (var stream = new MemoryStream())
                    {
                        img.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
                        result= stream.ToArray();
                    }
#endif
            }
            return File(result, "image/png");
        }

        [HttpGet("GetImage.svg")]
        public async Task<IActionResult> GetImageSvg(int DoorId)
        {
            string svgContent = await QDService.DoorGetLastSvg(DoorId);
            // se fosse vuoto...
            if (string.IsNullOrEmpty(svgContent))
            {
                // richiede ricalcolo img
                await SendRecalcReq(DoorId);
                // 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 IConfiguration _configuration = null!;

        private static Logger Log = LogManager.GetCurrentClassLogger();

        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<string> SendRecalcReq(int DoorId)
        {
            string answ = "";
            // richiede ricalcolo img
            List<string> doorIdList = new List<string>() { $"{DoorId}" };
            // chiamo reset richieste
            var list2Proc = await QDService.ResetQueueByDoorList(doorIdList);

            // recupero DDF ed invio x processing
            if (DoorId > 0)
            {
                string currDDF = await WDService.DoorOpGetDDF(DoorId);
                // versione corrente del DDF generato
                int currVers = await QDService.SendCalcReq(DoorId, currDDF);
            }

            // attende ...
            await Task.Delay(WaitReloadSvg);
            // riprova lettura
            answ = await QDService.DoorGetLastSvg(DoorId);
            return answ;
        }

        #endregion Private Methods
    }
}