using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Xml;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace ByteScoutWebApiExample
{
    class Program
    {
        // The authentication key (API Key).
        // Get your own by registering at https://app.pdf.co
        const String API_KEY = "********************************";

        static void Main(string[] args)
        {
            // --TemplateID--
            /* 
				Please follow below steps to create your own HTML Template and get "templateId". 
				1. Add new html template in app.pdf.co/templates/html
				2. Copy paste your html template code into this new template. Sample HTML templates can be found at "https://github.com/bytescout/pdf-co-api-samples/tree/master/PDF%20from%20HTML%20template/TEMPLATES-SAMPLES"
				3. Save this new template
				4. Copy it’s ID to clipboard
				5. Now set ID of the template into “templateId” parameter
			*/

            // HTML template using built-in template
            // see https://app.pdf.co/templates/html/2/edit
            var templateId = 425; //Replace with your template Id

            // Data to fill the template
            var reportData = _ExtractDataFromCCDA("./result_covid.xml");
            string templateData = JsonConvert.SerializeObject(reportData, Newtonsoft.Json.Formatting.Indented);

            // Destination PDF file name
            string destinationFile = @".\result.pdf";

            // Create standard .NET web client instance
            WebClient webClient = new WebClient();

            // Set API Key
            webClient.Headers.Add("x-api-key", API_KEY);

            webClient.Headers.Add("Content-Type", "application/json");

            try
            {
                // URL for `HTML to PDF` API call
                string url = Uri.EscapeUriString(string.Format(
                    "https://api.pdf.co/v1/pdf/convert/from/html?name={0}",
                    Path.GetFileName(destinationFile)));

                // Prepare requests params as JSON
                Dictionary<string, object> parameters = new Dictionary<string, object>();
                parameters.Add("name", Path.GetFileName(destinationFile));
                parameters.Add("templateId", templateId);
                parameters.Add("templateData", templateData);

                // Convert dictionary of params to JSON
                string jsonPayload = JsonConvert.SerializeObject(parameters);

                // Execute request
                string response = webClient.UploadString(url, jsonPayload);

                // Parse JSON response
                JObject json = JObject.Parse(response);

                if (json["error"].ToObject<bool>() == false)
                {
                    // Get URL of generated PDF file
                    string resultFileUrl = json["url"].ToString();

                    webClient.Headers.Remove("Content-Type"); // remove the header required for only the previous request

                    // Download the PDF file
                    webClient.DownloadFile(resultFileUrl, destinationFile);

                    Console.WriteLine("Generated PDF document saved as \"{0}\" file.", destinationFile);
                }
                else
                {
                    Console.WriteLine(json["message"].ToString());
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e.ToString());
            }

            webClient.Dispose();


            Console.WriteLine();
            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        /// <summary>
        /// Extract Data From C-CDA
        /// </summary>
        private static ResultVM _ExtractDataFromCCDA(string path)
        {
            var oRet = new ResultVM();

            var doc = new XmlDocument();
            doc.Load(path);

            XmlElement root = doc.DocumentElement;
            XmlNode observationNode = root.SelectSingleNode("entry").SelectSingleNode("organizer").SelectSingleNode("component").SelectSingleNode("observation");

            // Get Title
            oRet.Title = root.SelectSingleNode("code").Attributes["displayName"].Value;

            oRet.Description = observationNode.SelectSingleNode("code").Attributes["displayName"].Value;
            oRet.ValuePerUnit = observationNode.SelectSingleNode("value").Attributes["displayName"].Value;
            oRet.Interpretation = observationNode.SelectSingleNode("interpretationCode").Attributes["code"].Value == "A" ? "Abnornal" : "Normal";
            oRet.ReferenceRange = observationNode.SelectSingleNode("referenceRange").SelectSingleNode("observationRange").SelectSingleNode("text").InnerText;

            return oRet;
        }
    }
}

namespace ByteScoutWebApiExample
{
    public class ResultVM
    {
        public string Title { get; set; }
        public string Description { get; set; }
        public string ValuePerUnit { get; set; }
        public string Interpretation { get; set; }
        public string ReferenceRange { get; set; }
    }
}

<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>Results</title>
</head>
<body>
    <h3>Covid Result</h3>
    <hr />
    <table border="1" cellspacing="0" cellpadding="10">
        <thead>
            <tr>
                <th>Description</th>
                <th>Value / Unit</th>
                <th>Interpretation</th>
                <th>Reference Range</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <th colspan="4">{{Title}}</th>
            </tr>
            <tr ID="LabResult3">
                <td>{{Description}}</td>
                <td>{{ValuePerUnit}}</td>
                <td>{{Interpretation}}</td>
                <td>{{ReferenceRange}}</td>
            </tr>
        </tbody>
    </table>
</body>
</html>