using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Security.Authentication;
using System.Web.Http;
using Tango.BL;
using Tango.BL.Builders;
using Tango.BL.Entities;
using Tango.BL.Enumerations;
using Tango.Core.Cryptography;
using Tango.MachineService.Models;
using Tango.MachineStudio.Common.Authentication;
using System.Data.Entity;
using Tango.MachineStudio.Common.Update;
using Tango.Web.Controllers;
using Tango.Web.Helpers;
using Tango.Web.Storage;

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

        static MachineStudioController()
        {
            _pendingUploads = new List<MachineStudioPendingUpload>();
        }

        #region Update

        [HttpPost]
        public CheckForUpdatesResponse CheckForUpdates(CheckForUpdatesRequest request)
        {
            LogManager.Log("Request received...");

            CheckForUpdatesResponse response = new CheckForUpdatesResponse();

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                //Load relation 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.RunMachineStudio) || (request.Email == "ForceUpdate"))
                {
                    var versions = db.MachineStudioVersions.ToList();

                    MachineStudioVersion latestVersion = null;

                    if (request.AcceptBetaRelease)
                    {
                        latestVersion = versions.OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();
                    }
                    else
                    {
                        latestVersion = versions.Where(x => x.Stable).OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();
                    }

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

                    bool isForcedUpdate = versions.Exists(x => x.ForceUpdate && Version.Parse(x.Version) > currentVersion);

                    String comments = String.Join(Environment.NewLine, versions.OrderBy(x => Version.Parse(x.Version)).Where(x => Version.Parse(x.Version) > currentVersion).Select(x => x.Comments));

                    if (latestVersion != null && Version.Parse(latestVersion.Version) > currentVersion)
                    {
                        var manager = new StorageManager();
                        var container = manager.GetContainer(MachineServiceConfig.MACHINE_STUDIO_VERSIONS_CONTAINER);
                        var blob = container.GetBlockBlobReference(latestVersion.BlobName);

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

                        response.IsUpdateAvailable = true;
                        response.Version = latestVersion.Version;
                        response.Comments = latestVersion.Comments;
                        response.ForcedUpdate = isForcedUpdate;
                        response.IsStable = latestVersion.Stable;
                    }
                }
                else
                {
                    throw new AuthenticationException("Invalid user credentials.");
                }
            }

            return response;
        }

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

            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                //Load relation 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.PublishMachineStudioVersions))
                {
                    var latestVersion = db.MachineStudioVersions.ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();
                    Version currentVersion = Version.Parse(request.Version);

                    if (latestVersion == null || currentVersion > Version.Parse(latestVersion.Version))
                    {
                        String newVersionFileName = "Machine Studio Version" + " " + currentVersion.ToString() + ".zip";

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

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

                        _pendingUploads.Add(new MachineStudioPendingUpload()
                        {
                            UserGuid = user.Guid,
                            Comments = request.Comments,
                            ForcedUpdate = request.ForcedUpdate,
                            Token = response.Token,
                            Version = request.Version,
                            IsStable = request.IsStable,
                            BlobName = blob.Name,
                        });
                    }
                    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)
        {
            MachineStudioPendingUpload upload = _pendingUploads.FirstOrDefault(x => x.Token == request.Token);

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

                using (ObservablesContext db = ObservablesContextHelper.CreateContext())
                {
                    db.MachineStudioVersions.Add(new MachineStudioVersion()
                    {
                        Comments = upload.Comments,
                        BlobName = upload.BlobName,
                        UserGuid = upload.UserGuid,
                        Version = upload.Version,
                        ForceUpdate = upload.ForcedUpdate,
                        Stable = upload.IsStable,
                    });

                    db.SaveChanges();
                }

                return new UploadCompletedResponse();
            }
            else
            {
                throw new ArgumentException("Invalid Token.");
            }
        }

        [HttpPost]
        public LatestVersionResponse GetLatestVersion(LatestVersionRequest request)
        {
            using (ObservablesContext db = ObservablesContextHelper.CreateContext())
            {
                var version = db.MachineStudioVersions.ToList().OrderByDescending(x => Version.Parse(x.Version)).FirstOrDefault();
                return new LatestVersionResponse() { Version = version != null ? version.Version : "0.0.0.0" };
            }
        }

        #endregion

        [HttpPost]
        public LoginResponse Login(LoginRequest request)
        {
            AuthenticationResult authResult = AzureDirectoryHelper.AuthenticateUser(request.Email, request.Password);

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

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

                IHashGenerator g = new BasicHashGenerator();

                if (user == null)
                {
                    //Than add the user !!
                    User new_user = new User();
                    new_user.Email = request.Email;
                    new_user.Password = g.Encrypt(request.Password);
                    new_user.Organization = db.Organizations.Include(x => x.Address).Single(x => x.Name == "Twine");
                    new_user.Address = new_user.Organization.Address.Clone();
                    new_user.Contact = new Contact()
                    {
                        FirstName = authResult.UserInfo.GivenName,
                        LastName = authResult.UserInfo.FamilyName,
                        FullName = authResult.UserInfo.GivenName + " " + authResult.UserInfo.FamilyName,
                        Email = request.Email,
                    };
                    new_user.Roles.Add(db.Roles.Single(x => (Roles)x.Code == Roles.User));
                }
                else
                {
                    user.Password = g.Encrypt(request.Password);
                }

                db.SaveChanges();
            }

            return new LoginResponse()
            {
                DataSource = new Core.DataSource()
                {
                    Address = MachineServiceConfig.DB_ADDRESS,
                    Catalog = MachineServiceConfig.DB_CATALOG,
                    Type = Core.DataSourceType.Azure,
                    IntegratedSecurity = false,
                    UserName = request.Email,
                    Password = request.Password,
                }
            };
        }

    }
}