using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Data;
using System.Data.SqlClient;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System.Net.Http.Headers;
using System.Threading.Tasks;

namespace MYFORM_Form.Controllers
{
    public class MYController : Controller
    {
        string organizationUrl = "https://yourcrm.dynamics.com";
        string appKey = "*****";
        string aadInstance = "https://login.microsoftonline.com/";
        string tenantID = "myTenant.onmicrosoft.com";
        string clientId = "UserGUID****";
        public Task<String> SendData()
        {
            return AuthenticateWithCRM();
        }

        public async Task<String> AuthenticateWithCRM()
        {
            ClientCredential clientcred = new ClientCredential(clientId, appKey);
            AuthenticationContext authenticationContext = new AuthenticationContext(aadInstance + tenantID);
            AuthenticationResult authenticationResult = await authenticationContext.AcquireTokenAsync(organizationUrl, clientcred);
            using (HttpClient httpClient = new HttpClient())
                {
                    httpClient.BaseAddress = new Uri(organizationUrl);
                    httpClient.Timeout = new TimeSpan(0, 2, 0);  // 2 minutes  
                    httpClient.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
                    httpClient.DefaultRequestHeaders.Add("OData-Version", "4.0");
                    httpClient.DefaultRequestHeaders.Accept.Add(
                    new MediaTypeWithQualityHeaderValue("application/json"));
                    httpClient.DefaultRequestHeaders.Authorization =
                    new AuthenticationHeaderValue("Bearer", authenticationResult.AccessToken);
                    JObject myContact = new JObject
                        {
                            {"[EntityFieldname]", "[ValueToBeAdded]"}
                        };

                        HttpResponseMessage CreateResponse = await SendAsJsonAsync(httpClient, HttpMethod.Post, "api/data/v8.2/[EntityName]", myContact);

                        Guid applicationID = new Guid();
                        if (CreateResponse.IsSuccessStatusCode)
                        {
                            string applicationUri = CreateResponse.Headers.GetValues("OData-EntityId").FirstOrDefault();
                            if (applicationUri != null)
                                applicationID = Guid.Parse(applicationUri.Split('(', ')')[1]);
                            Console.WriteLine("Account created Id=", applicationID);
                            return applicationID.ToString();
                        }
                        else
                            return null;
                }

        }

        public static Task<HttpResponseMessage> SendAsJsonAsync<T>(HttpClient client, HttpMethod method, string requestUri, T value)
        {
            var content = value.GetType().Name.Equals("JObject") ?
                value.ToString() :
                JsonConvert.SerializeObject(value, new JsonSerializerSettings() { DefaultValueHandling = DefaultValueHandling.Ignore });

            HttpRequestMessage request = new HttpRequestMessage(method, requestUri) { Content = new StringContent(content) };
            request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");
            request.Headers.Add("User-Agent", "User-Agent-Here");
            return  client.SendAsync(request);
        }
    }
}