using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web;

namespace VECV_WebApi.App_Start
{
  public class TokenService
  {
    public async Task<string> GetAccessTokenAsync()
    {
      var tokenEndpoint = "https://your-auth-server.com/oauth/token";
      var clientId = "your_client_id";
      var clientSecret = "your_client_secret";
      var username = "user@example.com";
      var password = "user_password";

      using (var client = new HttpClient())
      {
        var formData = new Dictionary<string, string>
            {
                {"grant_type", "password"},
                {"client_id", clientId},
                {"client_secret", clientSecret},
                {"username", username},
                {"password", password}
            };

        var content = new FormUrlEncodedContent(formData);

        var response = await client.PostAsync(tokenEndpoint, content);
        var responseContent = await response.Content.ReadAsStringAsync();

        if (response.IsSuccessStatusCode)
        {
          // Parse and return access_token (you can use JSON.NET)
          dynamic result = Newtonsoft.Json.JsonConvert.DeserializeObject(responseContent);
          return result.access_token;
        }
        else
        {
          throw new Exception("Failed to get token: " + responseContent);
        }
      }
    }
  }
}