using Newtonsoft.Json;
using RestSharp;
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;

namespace Epic
{
    public class Auth
    {
        public Auth()
        {
        }

        private static string DeviceToAccount()
        {
            RestClient restClient = new RestClient("https://account-public-service-prod03.ol.epicgames.com/account/api/oauth/deviceAuthorization");
            RestRequest restRequest = new RestRequest(1);
            restRequest.AddHeader("Authorization", string.Concat("Bearer ", Auth.DeviceToken()));
            restRequest.AddHeader("Content-Type", "application/x-www-form-urlencoded");
            dynamic obj = JsonConvert.DeserializeObject(restClient.Execute(restRequest).get_Content());
            Process.Start(new ProcessStartInfo((string)obj.verification_uri_complete)
            {
                UseShellExecute = true
            });
            string content = " ";
            do
            {
                RestClient restClient1 = new RestClient("https://account-public-service-prod03.ol.epicgames.com/account/api/oauth/token");
                RestRequest restRequest1 = new RestRequest(1);
                restRequest1.AddHeader("Authorization", "Basic OThmN2U0MmMyZTNhNGY4NmE3NGViNDNmYmI0MWVkMzk6MGEyNDQ5YTItMDAxYS00NTFlLWFmZWMtM2U4MTI5MDFjNGQ3");
                restRequest1.AddHeader("Content-Type", "application/x-www-form-urlencoded");
                restRequest1.AddParameter("grant_type", "device_code");
                restRequest1.AddParameter("device_code", obj.device_code);
                content = restClient1.Execute(restRequest1).get_Content();
            }
            while (content.Contains("error"));
            return (string)JsonConvert.DeserializeObject(content).access_token;
        }

        private static string DeviceToken()
        {
            RestClient restClient = new RestClient("https://account-public-service-prod03.ol.epicgames.com/account/api/oauth/token");
            RestRequest restRequest = new RestRequest(1);
            restRequest.AddHeader("Authorization", "Basic OThmN2U0MmMyZTNhNGY4NmE3NGViNDNmYmI0MWVkMzk6MGEyNDQ5YTItMDAxYS00NTFlLWFmZWMtM2U4MTI5MDFjNGQ3");
            restRequest.AddHeader("Content-Type", "application/x-www-form-urlencoded");
            restRequest.AddParameter("grant_type", "client_credentials");
            dynamic obj = JsonConvert.DeserializeObject(restClient.Execute(restRequest).get_Content());
            return (string)obj.access_token;
        }

        public static string ExchangeCode()
        {
            RestClient restClient = new RestClient("https://account-public-service-prod03.ol.epicgames.com/account/api/oauth/exchange");
            RestRequest restRequest = new RestRequest(0);
            restRequest.AddHeader("Authorization", string.Concat("Bearer ", Auth.DeviceToAccount()));
            dynamic obj = JsonConvert.DeserializeObject(restClient.Execute(restRequest).get_Content());
            return (string)obj.code;
        }
    }
}