using Microsoft.Azure.ActiveDirectory.GraphClient;
using Microsoft.Azure.ActiveDirectory.GraphClient.Extensions;
using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Web.ActiveDirectory
{
    public class ActiveDirectoryManager
    {
        private String _service_root = $"https://login.microsoftonline.com/{WebConfig.TENANT_ID}";

        public AuthenticationResult ValidateUserCredentials(String email, String password)
        {
            var authContext = new AuthenticationContext(_service_root);
            authContext.TokenCache.Clear();
            UserCredential userCredential = new UserPasswordCredential(email, password);
            AuthenticationResult authResult = authContext.AcquireTokenAsync("https://graph.windows.net/", WebConfig.CLIENT_ID, userCredential).Result;
            return authResult;
        }

        private AuthenticationResult GetAppAuthenticationResult()
        {
            var authContext = new AuthenticationContext(_service_root);
            ClientCredential clientCredentials = new ClientCredential(WebConfig.CLIENT_ID, WebConfig.APP_SECRET);
            AuthenticationResult authResult = authContext.AcquireTokenAsync("https://graph.windows.net/", clientCredentials).Result;
            return authResult;
        }

        //public List<Group> GetUserGroups(String email)
        //{
        //    var authResult = GetAppAuthenticationResult();
        //    ActiveDirectoryClient activeDirectoryClient = new ActiveDirectoryClient(new Uri($"https://graph.windows.net/{WebConfig.TENANT_ID}"), async () => await Task.FromResult(authResult.AccessToken));
        //    var user = activeDirectoryClient.Users.Where(x => x.UserPrincipalName == email).ExecuteSingleAsync().Result;

        //    var userFetcher = (IUserFetcher)user;

        //    List<Group> groups = new List<Group>();

        //    IPagedCollection<IDirectoryObject> pagedCollection = userFetcher.MemberOf.ExecuteAsync().Result;
        //    do
        //    {
        //        List<IDirectoryObject> directoryObjects = pagedCollection.CurrentPage.ToList();
        //        foreach (IDirectoryObject directoryObject in directoryObjects)
        //        {
        //            if (directoryObject is Group)
        //            {
        //                var group = directoryObject as Group;
        //                groups.Add(group);
        //            }
        //        }
        //        pagedCollection = pagedCollection.GetNextPageAsync().Result;
        //    } while (pagedCollection != null);

        //    return groups;
        //}

        //public bool IsUserMemberOf(String group, String email)
        //{
        //    return GetUserGroups(email).Exists(x => x.DisplayName == group);
        //}

        //public bool CanUserAccessCurrentEnvironment(String email)
        //{
        //    var groups = GetUserGroups(email);
        //    return groups.Exists(x => x.DisplayName == WebConfig.ENVIRONMENT_GROUP);
        //}
    }
}