using System.Text;
using System.Xml.Linq;
using Microsoft.Extensions.Options;
using Landmark.OLA.Models.OnlineBanking;
using OnlineBankingAuth.Configuration;
using OnlineBankingAuth.Parsers;

namespace OnlineBankingAuth.Services
{
    public class DigitalInsightService : IDigitalInsightService
    {
        private readonly SecuritySettings _settings;
        private readonly IAuthTokenParser _parser;

        public DigitalInsightService(
            IAuthTokenParser parser,
            IOptions<SecuritySettings> settings)
        {
            _parser = parser;
            _settings = settings.Value;
        }

        public OnlineBankingFormData PopulateOnlineBankingDataFromConfig(OnlineBankingFormData data)
        {
            data.Authorization = "Basic " +
                    Convert.ToBase64String(
                        Encoding.UTF8.GetBytes(
                            _settings.DigitalInsightConsumerKey + ":" + _settings.DigitalInsightConsumerSecret
                        )
                    );
            data.DI_FIID = _settings.DigitalInsightFIID;
            data.DI_TID = (Guid.NewGuid()).ToString();
            

            return data;
        }

        private IEnumerable<KeyValuePair<string, string>> BuildKeyValuePair(OnlineBankingFormData data)
        {
            return new Dictionary<string, string>
            {
                {"grant_type", data.GrantType },
                {"username", data.Username },
                {"password", data.Password }
            };
        }

        public async Task<AuthTokenResponse> LoginUser(OnlineBankingFormData data)
        {
            try
            {
                using (var hc = new HttpClient())
                {
                    var formData = BuildKeyValuePair(data);
                    using (var content = new FormUrlEncodedContent(formData))
                    {
                        content.Headers.Clear();
                        content.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                        HttpContent httpContent = new StringContent(await content.ReadAsStringAsync(), Encoding.UTF8, "application/x-www-form-urlencoded");

                        var httpRequest = new HttpRequestMessage(HttpMethod.Post, _settings.DigitalInsightPostTokenURI);
                        httpRequest.Content = httpContent;
                        
                        httpRequest.Headers.Add("Authorization", data.Authorization);
                        httpRequest.Headers.Add("di_fiid", data.DI_FIID);
                        httpRequest.Headers.Add("di_tid", data.DI_TID);

                        var response = hc.SendAsync(httpRequest);
                        var xdoc = XDocument.Parse(await response.Result.Content.ReadAsStringAsync());
                        var xel = XElement.Parse(xdoc.ToString());

                        var authTokenResponse = _parser.ParseAuthTokenResponse(xel);
                        return authTokenResponse;
                    }
                }

            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}