using Newtonsoft.Json;
using Serwer.Core.Domain;
using Serwer.Infrastructure.Framework;
using Serwer.Infrastructure.Settings;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Tesseract;

namespace Serwer.Infrastructure.Services
{
    public class ImageHandler : IImageHandler
    {
        private readonly ISet<File> _files = new HashSet<File>();
        private readonly string _env;
        public ImageHandler(IHostEnviroment hostEnviroment)
        {
            _env = hostEnviroment.RootPath;
        }
        public async Task<string> Process(string name, string contentType, byte[] bytes)
        {
            string license_code = "FC935C59-F248-48A3-9970-8A6BDB66FA86";
            string user_name = "poszukiwacz";

            string ocrURL = @"http://www.ocrwebservice.com/restservices/processDocument?gettext=true&outputformat=txt&language=polish";
            byte[] uploadData = bytes;

            HttpWebRequest request = CreateHttpRequest(ocrURL, user_name, license_code, "POST");
            request.ContentLength = uploadData.Length;

            //  Send request
            using (System.IO.Stream post = request.GetRequestStream())
            {
                post.Write(uploadData, 0, (int)uploadData.Length);
            }

            try
            {
                //  Get response
                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    // Parse JSON response
                    string strJSON = new System.IO.StreamReader(response.GetResponseStream()).ReadToEnd();
                    OCRResponseData ocrResponse = JsonConvert.DeserializeObject<OCRResponseData>(strJSON);

                    return await Task.FromResult(ocrResponse.OCRText.First().First());

                }
            }
            catch (WebException wex)
            {
                var x = string.Format("OCR API Error. HTTPCode:{0}", ((HttpWebResponse)wex.Response).StatusCode);
                throw wex;
            }
            /*
            var engine = new TesseractEngine(System.IO.Path.Combine(_env, "tessdata"),"eng+equ", EngineMode.Default);
            var img = Pix.LoadFromMemory(bytes);
            var res = engine.Process(img);
            var txt = res.GetText();

            return await Task.FromResult(txt);
            */

        }
        private static HttpWebRequest CreateHttpRequest(string address_url, string user_name, string license_code, string http_method)
        {
            Uri address = new Uri(address_url);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(address);

            byte[] authBytes = Encoding.UTF8.GetBytes(string.Format("{0}:{1}", user_name, license_code).ToCharArray());
            request.Headers["Authorization"] = "Basic " + Convert.ToBase64String(authBytes);
            request.Method = http_method;
            request.Timeout = 600000;

            // Specify Response format to JSON or XML (application/json or application/xml)
            request.ContentType = "application/json";

            return request;
        }
    }
}