using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Net.Mail;
using Newtonsoft.Json.Linq;

namespace Example
{
	internal class Program
	{
		private static void Main()
		{  
            // Test sending email 
		    string to = "elmer.thomas@sendgrid.com";
		    string from = "dx@sendgrid.com";
		    string fromName = "Elmer Thomas";
            SendEmail(to, from, fromName);
            // Test viewing, creating, modifying and deleting API keys through our v3 Web API 
            ApiKeys();
        }

        private static void SendAsync(SendGrid.SendGridMessage message)
	    {
            // Create credentials, specifying your user Name and password.
            string username = Environment.GetEnvironmentVariable("SENDGRID_USERNAME");
            string password = Environment.GetEnvironmentVariable("SENDGRID_PASSWORD");
            //string apikey = Environment.GetEnvironmentVariable("SENDGRID_APIKEY");
            var credentials = new NetworkCredential(username, password);

            // Create a Web transport for sending email.
            var transportWeb = new SendGrid.Web(credentials);
            //var transportWeb2 = new SendGrid.Web(apikey);

            // Send the email.
            try
            {
                transportWeb.DeliverAsync(message).Wait();
                Console.WriteLine("Email sent to " + message.To.GetValue(0));
                Console.WriteLine("Press any key to continue.");
                Console.ReadKey();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine("Press any key to continue.");
                Console.ReadKey();
            }
	    }

	    private static void SendEmail(string to, string from, string fromName)
	    {
            // Create the email object first, then add the properties.
            var myMessage = new SendGrid.SendGridMessage();
            myMessage.AddTo(to);
            myMessage.From = new MailAddress(from, fromName);
            myMessage.Subject = "Testing the SendGrid Library";
            myMessage.Text = "Hello World! %tag%";

            var subs = new List<String> { "私は%type%ラーメンが大好き" };
            myMessage.AddSubstitution("%tag%", subs);
            myMessage.AddSection("%type%", "とんこつ");

            SendAsync(myMessage);
        }

	    private static void ApiKeys()
	    {
            String apiKey = Environment.GetEnvironmentVariable("SENDGRID_APIKEY", EnvironmentVariableTarget.User);
            var client = new SendGrid.Client(apiKey);
            string _api_key_id;

            // GET API KEYS
            HttpResponseMessage responseGet = client.ApiKeys.Get();
            Console.WriteLine(responseGet.StatusCode);
            Console.WriteLine(responseGet.Content.ReadAsStringAsync().Result);
            Console.WriteLine("These are your current API Keys. Press any key to continue.");
            Console.ReadKey();

            // POST API KEYS
            HttpResponseMessage responsePost = client.ApiKeys.Post("CSharpTestKey");
            string rawString = responsePost.Content.ReadAsStringAsync().Result;
            dynamic jsonObject = JObject.Parse(rawString);
            _api_key_id = jsonObject.api_key_id.ToString();
            Console.WriteLine(responsePost.StatusCode);
            Console.WriteLine(responsePost.Content.ReadAsStringAsync().Result);
            Console.WriteLine("API Key created. Press any key to continue.");
            Console.ReadKey();

            // PATCH API KEYS
            HttpResponseMessage responsePatch = client.ApiKeys.Patch(_api_key_id, "CSharpTestKeyPatched");
            Console.WriteLine(responsePatch.StatusCode);
            Console.WriteLine(responsePatch.Content.ReadAsStringAsync().Result);
            Console.WriteLine("API Key patched. Press any key to continue.");
            Console.ReadKey();

            // DELETE API KEYS
            Console.WriteLine("Deleting API Key, please wait.");
            client.ApiKeys.Delete(_api_key_id);
            HttpResponseMessage responseFinal = client.ApiKeys.Get();
            Console.WriteLine(responseFinal.StatusCode);
            Console.WriteLine(responseFinal.Content.ReadAsStringAsync().Result);
            Console.WriteLine("API Key Deleted, press any key to end");
            Console.ReadKey();
        }
	}
}