using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Security.Authentication;
using System.Threading.Tasks;
using System.Web.Http;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.Core;
using Tango.Core.Cryptography;
using Tango.Core.DB;
using Tango.FSE.Web.Messages;
using Tango.MachineService.Filters;
using Tango.Web.Controllers;
using Tango.Web.Helpers;
using Tango.Web.Security;
using Tango.Web.SMO;
using Tango.Web.SQLServer;
using Tango.Web.Storage;

namespace Tango.MachineService.Controllers
{
    public class FSEController : TangoController
    {
        public class TokenObject
        {
            public String UserGuid { get; set; }
        }

        /// <summary>
        /// Login to the service.
        /// </summary>
        /// <param name="request">The request.</param>
        /// <returns></returns>
        /// <exception cref="AuthenticationException"></exception>
        [HttpPost]
        public LoginResponse Login(LoginRequest request)
        {
            User user = null;
            DataSource dataSource = null;
            IHashGenerator hash = new BasicHashGenerator();

            Version client_version;

            if (!Version.TryParse(request.Version, out client_version))
            {
                client_version = new Version("1.0.0.0");
            }

            var password = hash.Encrypt(request.Password);

            using (var db = ObservablesContextHelper.CreateContext())
            {
                user = new UserBuilder(db).Set(x => x.Email.ToLower() == request.Email.ToLower() && x.Password == password).WithRolesAndPermissions().WithDeleted().Build();

                if (user == null)
                {
                    throw new AuthenticationException("Invalid email or password.");
                }

                if (user.Deleted)
                {
                    throw new AuthenticationException("Your account has been disabled. Please contact your administrator.");
                }

                user.LastLogin = DateTime.UtcNow;
                db.SaveChanges();
            }

            SQLServerManager sqlServer = new SQLServerManager();
            var accessToken = sqlServer.GetAccessToken();

            dataSource = new DataSource()
            {
                Address = MachineServiceConfig.DB_ADDRESS,
                Catalog = MachineServiceConfig.DB_CATALOG,
                Type = DataSourceType.AccessToken,
                IntegratedSecurity = false,
                AccessToken = accessToken.AccessToken,
                AccessTokenExpiration = accessToken.ExpiresOn.UtcDateTime
            };


            //Enforce Machine Studio Version ?
            //if (MachineServiceConfig.ENFORCE_MACHINE_STUDIO_VERSION)
            //{
            //    using (var db = ObservablesContextHelper.CreateContext())
            //    {
            //        var latest_version = db.MachineStudioVersions.ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();

            //        if (latest_version != null && Version.Parse(latest_version.Version) != client_version)
            //        {
            //            versionChangeRequired = true;
            //            requiredVersion = latest_version.Version;
            //        }
            //    }
            //}

            //Return data source
            return new LoginResponse()
            {
                DataSource = dataSource,
                AccessToken = WebToken<TokenObject>.CreateNew(MachineServiceConfig.JWT_TOKEN_SECRET, new TokenObject()
                {
                    UserGuid = user.Guid,
                }, DateTime.UtcNow.AddDays(1)).AccessToken,
                PasswordChangeRequired = user.PasswordChangeRequired
            };
        }

        [HttpPost]
        [JwtTokenFilter]
        public BugReportingInfoResponse GetBugReportInfo(BugReportingInfoRequest request)
        {
            return new BugReportingInfoResponse()
            {
                CollectionUrl = MachineServiceConfig.TFS_COLLECTION_URL,
                PersonalToken = MachineServiceConfig.TFS_PERSONAL_TOKEN,
                UserEmail = MachineServiceConfig.FSE_TFS_USER_EMAIL
            };
        }

        [HttpPost]
        [JwtTokenFilter]
        public DownloadTangoVersionResponse DownloadTangoVersion(DownloadTangoVersionRequest request)
        {
            DownloadTangoVersionResponse response = new DownloadTangoVersionResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                var tangoVersion = db.TangoVersions.SingleOrDefault(x => x.Guid == request.TangoVersionGuid);

                if (tangoVersion == null)
                {
                    throw new ArgumentException("Could not locate the specified Tango version.");
                }

                response.Version = tangoVersion.Version;

                var manager = new BlobStorageManager();
                var container = manager.GetContainer(MachineServiceConfig.TANGO_VERSIONS_CONTAINER);
                var blob = container.GetBlockBlobReference(tangoVersion.BlobName);

                response.BlobAddress = blob.GenerateReadSignature(TimeSpan.FromMinutes(60));

                if (!String.IsNullOrWhiteSpace(MachineServiceConfig.CDN_ENDPOINT))
                {
                    response.CdnAddress = MachineServiceConfig.CDN_ENDPOINT + blob.Uri.AbsolutePath;
                }

                DbCredentials credentials = new DbCredentials();

                using (SmoManager smo = new SmoManager())
                {
                    credentials = smo.CreateRandomLoginAndUser();

                    Task.Delay(TimeSpan.FromMinutes(PPCController.SQL_TEMP_CREDENTIALS_EXP_MINUTS)).ContinueWith((x) =>
                    {
                        using (SmoManager m = new SmoManager())
                        {
                            m.DeleteLoginAndUser(credentials.UserName);
                        }
                    });
                }

                response.DataSource = new DataSource()
                {
                    Address = MachineServiceConfig.DB_ADDRESS,
                    Catalog = MachineServiceConfig.DB_CATALOG,
                    UserName = credentials.UserName,
                    Password = credentials.Password,
                    IntegratedSecurity = false,
                    Type = DataSourceType.SQLServer,
                };
            }

            return response;
        }
    }
}