using Google.Protobuf;
using Microsoft.Azure;
using Microsoft.Azure.Management.Sql;
using Microsoft.SqlServer.Management.Smo;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Security.Authentication;
using System.Threading.Tasks;
using System.Web.Hosting;
using System.Web.Http;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.BL.Enumerations;
using Tango.Core;
using Tango.Core.DB;
using Tango.Core.Helpers;
using Tango.Core.IO;
using Tango.Logging;
using Tango.MachineService.Models;
using Tango.PMR.Stubs;
using Tango.PMR.Synchronization;
using Tango.PPC.Common.MachineSetup;
using Tango.PPC.Common.MachineUpdate;
using Tango.PPC.Common.Update;
using Tango.Synchronization.Local;
using Tango.Synchronization.Remote;
using Tango.Web.Controllers;
using Tango.Web.Helpers;
using Tango.Web.SMO;
using Tango.Web.Storage;

namespace Tango.MachineService.Controllers
{
    public class PPCController : JsonController
    {
        private static List<PPCPendingUpload> _pendingUploads;

        #region Constructors

        static PPCController()
        {
            _pendingUploads = new List<PPCPendingUpload>();
        }

        #endregion

        #region Setup & Update

        [HttpPost]
        public MachineSetupResponse MachineSetup(MachineSetupRequest request)
        {
            MachineSetupResponse response = new MachineSetupResponse();

            LogManager.Log("Setup request received: " + request.ToString());

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                db.Configuration.LazyLoadingEnabled = false;
                String serial_number = request.SerialNumber;

                var machine = db.Machines.SingleOrDefault(x => x.SerialNumber == serial_number);

                if (machine == null)
                {
                    throw new AuthenticationException("The specified serial number could not be found.");
                }

                if (machine.SetupActivation && machine.OsKey == null)
                {
                    throw new InvalidDataException("The specified machine is configured to perform an OS activation but is not associated with an OS activation key.");
                }

                var machine_version = db.MachineVersions.SingleOrDefault(x => x.Guid == machine.MachineVersionGuid);

                var latest_machine_version = db.TangoVersions.Where(x => x.MachineVersionGuid == machine_version.Guid).ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();

                response.Version = latest_machine_version.Version;

                var manager = new StorageManager();
                var container = manager.GetContainer(MachineServiceConfig.TANGO_VERSIONS_CONTAINER);
                var blob = container.GetBlockBlobReference(latest_machine_version.BlobName);

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

                DbCredentials credentials = new DbCredentials();

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

                    Task.Delay(TimeSpan.FromMinutes(10)).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,
                };

                response.OSKey = machine.OsKey;
                response.SetupActivation = machine.SetupActivation;
                response.SetupRemoteAssistance = machine.SetupRemoteAssistance;
                response.SetupUWF = machine.SetupUwf;
                response.SetupFirmware = machine.SetupFirmware;
                response.IsDemo = machine.IsDemo;

            }

            return response;
        }

        [HttpPost]
        public DownloadUpdateResponse MachineUpdate(DownloadUpdateRequest request)
        {
            DownloadUpdateResponse response = new DownloadUpdateResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                db.Configuration.LazyLoadingEnabled = false;
                String serial_number = request.SerialNumber;

                var machine = db.Machines.SingleOrDefault(x => x.SerialNumber == serial_number);

                if (machine == null)
                {
                    throw new AuthenticationException("The specified serial number could not be found.");
                }

                var machine_version = db.MachineVersions.SingleOrDefault(x => x.Guid == machine.MachineVersionGuid);

                var latest_machine_version = db.TangoVersions.Where(x => x.MachineVersionGuid == machine_version.Guid).ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();

                response.Version = latest_machine_version.Version;

                var manager = new StorageManager();
                var container = manager.GetContainer(MachineServiceConfig.TANGO_VERSIONS_CONTAINER);
                var blob = container.GetBlockBlobReference(latest_machine_version.BlobName);

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

                DbCredentials credentials = new DbCredentials();

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

                    Task.Delay(TimeSpan.FromMinutes(10)).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;
        }

        [HttpPost]
        public CheckForUpdateResponse CheckForUpdate(CheckForUpdateRequest request)
        {
            CheckForUpdateResponse response = new CheckForUpdateResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                db.Configuration.LazyLoadingEnabled = false;

                var machine = db.Machines.SingleOrDefault(x => x.SerialNumber == request.SerialNumber);

                if (machine == null)
                {
                    throw new AuthenticationException("The specified serial number could not be found.");
                }

                var machine_version = db.MachineVersions.SingleOrDefault(x => x.Guid == machine.MachineVersionGuid);

                var latest_machine_version = db.TangoVersions.Where(x => x.MachineVersionGuid == machine_version.Guid).ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();

                if (Version.Parse(latest_machine_version.Version) > Version.Parse(request.Version))
                {
                    response.IsUpdateAvailable = true;
                }

                response.Version = latest_machine_version.Version;
            }

            return response;
        }

        [HttpPost]
        public UpdateDBResponse UpdateDB(UpdateDBRequest request)
        {
            UpdateDBResponse response = new UpdateDBResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                db.Configuration.LazyLoadingEnabled = false;
                String serial_number = request.SerialNumber;

                var machine = db.Machines.SingleOrDefault(x => x.SerialNumber == serial_number);

                if (machine == null)
                {
                    throw new AuthenticationException("The specified serial number could not be found.");
                }

                DbCredentials credentials = new DbCredentials();

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

                    Task.Delay(TimeSpan.FromMinutes(10)).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;
        }

        #endregion

        #region Version Upload

        [HttpPost]
        public LatestVersionResponse GetLatestVersion(LatestVersionRequest request)
        {
            LatestVersionResponse response = new LatestVersionResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                var versions = db.TangoVersions.Where(x => x.MachineVersionGuid == request.MachineVersionGuid).ToList();

                if (versions.Count == 0)
                {
                    return new LatestVersionResponse()
                    {
                        Version = "0.0.0.0",
                    };
                }

                response.Version = versions.OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault().Version;
            }

            return response;
        }

        [HttpPost]
        public UploadVersionResponse UploadVersion(UploadVersionRequest request)
        {
            UploadVersionResponse response = new UploadVersionResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                //Load relations first...
                db.Roles.ToList();
                db.Permissions.ToList();
                db.UsersRoles.ToList();
                db.RolesPermissions.ToList();

                var user = db.Users.SingleOrDefault(x => x.Email.ToLower() == request.Email.ToLower() && x.Password == request.Password);

                if (user != null && user.HasPermission(Permissions.PublishPPCVersions))
                {
                    var versions = db.TangoVersions.ToList().Where(x => x.MachineVersionGuid == request.MachineVersionGuid).OrderByDescending(x => Version.Parse(x.Version)).ToList();

                    TangoVersion latestVersion = new TangoVersion();
                    latestVersion.Version = "0.0.0.0";

                    if (versions.Count > 0)
                    {
                        latestVersion = versions.FirstOrDefault();
                    }

                    Version currentVersion = Version.Parse(request.Version);

                    if (currentVersion > Version.Parse(latestVersion.Version))
                    {
                        String newVersionFileName = "Tango Version" + " " + currentVersion.ToString() + ".zip";

                        var manager = new StorageManager();
                        var container = manager.GetContainer(MachineServiceConfig.TANGO_VERSIONS_CONTAINER);
                        var blob = container.CreateEmptyBlob(newVersionFileName);

                        response.Token = Guid.NewGuid().ToString();
                        response.BlobAddress = blob.GenerateWriteSignature(TimeSpan.FromMinutes(30));

                        _pendingUploads.Add(new PPCPendingUpload()
                        {
                            UserGuid = user.Guid,
                            Comments = request.Comments,
                            Token = response.Token,
                            Version = request.Version,
                            BlobName = blob.Name,
                            MachineVersionGuid = request.MachineVersionGuid,
                        });
                    }
                    else
                    {
                        throw new ArgumentException("New version must be greater than latest version.");
                    }
                }
                else
                {
                    throw new AuthenticationException("Invalid user credentials.");
                }
            }

            return response;
        }

        [HttpPost]
        public UploadCompletedResponse NotifyUploadCompleted(UploadCompletedRequest request)
        {
            PPCPendingUpload upload = _pendingUploads.FirstOrDefault(x => x.Token == request.AccessToken);

            if (upload != null)
            {
                _pendingUploads.RemoveAll(x => x.Token == upload.Token);

                using (ObservablesContext db = ObservablesContextHelper.CreateContext())
                {
                    db.TangoVersions.Add(new TangoVersion()
                    {
                        Comments = upload.Comments,
                        BlobName = upload.BlobName,
                        UserGuid = upload.UserGuid,
                        Version = upload.Version,
                        MachineVersionGuid = upload.MachineVersionGuid
                    });

                    db.SaveChanges();
                }

                return new UploadCompletedResponse();
            }
            else
            {
                throw new AuthenticationException("Invalid upload token.");
            }
        }

        [HttpPost]
        public MachineVersionsResponse GetMachineVersions(MachineVersionsRequest request)
        {
            using (var db = ObservablesContextHelper.CreateContext())
            {
                return new MachineVersionsResponse()
                {
                    MachineVersions = db.MachineVersions.ToList(),
                };
            }
        }

        #endregion

        [HttpPost]
        public Machine PersonTest(Person p)
        {
            using (var db = ObservablesContextHelper.CreateContext())
            {
                var machine = new MachineBuilder(db)
                    .Set(x => x.SerialNumber == "1111")
                    .WithOrganization()
                    .WithConfiguration().Build();

                return machine;
            }
        }
    }
}