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
		const String API_KEY = "***********************************";
		
		// Source PDF files
		static string[] SourceFiles = new string[] { @".\sample1.pdf", @".\sample2.pdf" };
		// Destination PDF file name
		const string DestinationFile = @".\result.pdf";

		static void Main(string[] args)
		{
			// Create standard .NET web client instance
			WebClient webClient = new WebClient();

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

			// 1. UPLOAD FILES TO CLOUD

			List<string> uploadedFiles = new List<string>();

			try
			{
				foreach (string pdfFile in SourceFiles)
				{
					// 1a. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE.
					
					// Prepare URL for `Get Presigned URL` API call
					string query = Uri.EscapeUriString(string.Format(
						"https://api.pdf.co/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}",
						Path.GetFileName(pdfFile)));

					// Execute request
					string response = webClient.DownloadString(query);

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

					if (json["error"].ToObject<bool>() == false)
					{
						// Get URL to use for the file upload
						string uploadUrl = json["presignedUrl"].ToString();
						// Get URL of uploaded file to use with later API calls
						string uploadedFileUrl = json["url"].ToString();

						// 1b. UPLOAD THE FILE TO CLOUD.

						webClient.Headers.Add("content-type", "application/octet-stream");
						webClient.UploadFile(uploadUrl, "PUT", pdfFile); // You can use UploadData() instead if your file is byte[] or Stream
						
						uploadedFiles.Add(uploadedFileUrl);
					}
					else
					{
						Console.WriteLine(json["message"].ToString());
					}
				}

				if (uploadedFiles.Count > 0)
				{
					// 2. MERGE UPLOADED PDF DOCUMENTS

					// URL for `Merge PDF` API call
					string url = "https://api.pdf.co/v1/pdf/merge";

					// Prepare requests params as JSON
					Dictionary<string, object> parameters = new Dictionary<string, object>();
					parameters.Add("name", Path.GetFileName(DestinationFile));
					parameters.Add("url", string.Join(",", uploadedFiles));

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

					// Execute POST request with JSON payload
					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();

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

						Console.WriteLine("Generated PDF file 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...");
			Console.ReadKey();
		}
	}
}