using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
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/documentation/api
        const String API_KEY = "***********************************";

        static void Main(string[] args)
        {
            // HTML template
            string template = File.ReadAllText(@".\invoice_template.html");
            // Data to fill the template
            string templateData = File.ReadAllText(@".\invoice_data.json");
            // 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("html", template);
                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();
        }
    }
}