using Microsoft.Win32;
using MySql.Data.Entity;
using System;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Globalization;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using Thermo.Active.Database.Controllers;
using Thermo.Active.Database.Migrations;
using Thermo.Active.Model.DatabaseModels;
using static Thermo.Active.Config.ServerConfig;
using static Thermo.Active.Model.Constants;
using static Thermo.Active.Utils.ExceptionManager;

namespace Thermo.Active.Database
{
	[DbConfigurationType(typeof(MySqlEFConfiguration))]
	public class DatabaseContext : DbContext
	{
		public DbSet<UserModel> Users { get; set; }
		public DbSet<MachineModel> Machines { get; set; }
		public DbSet<MachineUserModel> MachinesUsers { get; set; }
		public DbSet<RoleModel> Roles { get; set; }
		public DbSet<FunctionAccessModel> FunctionsAccess { get; set; }
		public DbSet<SessionModel> Sessions { get; set; }
		public DbSet<FavoriteUserSoftkeyModel> FavoriteUserSoftkeys { get; set; }
		public DbSet<KeyboardUserSoftKeyModel> KeyboardUserSoftkeys { get; set; }
		// Maintenances
		public DbSet<MaintenanceModel> Maintenances { get; set; }
		public DbSet<PerformedMaintenanceModel> PerformedMaintenances { get; set; }
		public DbSet<MaintenanceNoteModel> MaintenancesNotes { get; set; }
		public DbSet<MaintenanceFileModel> MaintenanceFiles { get; set; }
		// Tool tables
		public DbSet<DbNcFamilyModel> Families { get; set; }
		public DbSet<QueueItemsModel> Queue { get; set; }
		// Alarms
		public DbSet<AlarmDescriptionsModel> AlarmDescriptions { get; set; }
		public DbSet<AlarmOccurrencesModel> AlarmOccurrences { get; set; }
		public DbSet<AlarmUserModel> AlarmUsers { get; set; }
		public DbSet<AlarmNoteModel> AlarmsNotes { get; set; }
		public DbSet<AlarmFileModel> AlarmFiles { get; set; }

		// thermo!
		public DbSet<ProdInfoModel> ProdInfo { get; set; }
		public DbSet<HistorySheetModel> HistorySheet { get; set; }	

		// Create migration string
		public static string CONNECTION_STRING = "Server = " + "localhost" + "; Database=" + DATABASE_NAME + ";Uid=" + DATABASE_USER + ";Pwd=" + DATABASE_PWD + ";";

		// public static string CONNECTION_STRING = "Server = " + ServerStartupConfig.DatabaseAddress + "; Database=" + DATABASE_NAME +";Uid="+ DATABASE_USER +";Pwd="+ DATABASE_PWD +";";

		public DatabaseContext()
				: base(CONNECTION_STRING)
		{
		}

		public static DatabaseContext Create()
		{
			return new DatabaseContext();
		}

		public static bool SetUpDbConnectionAndDbConfig()
		{
			try
			{
                String serviceName = getDbServiceName();
                if(serviceName.Equals(""))
                {
                    ManageError(ERROR_LEVEL.FATAL, "Database SQL service not found", true);
                    return false;
                }

                String serviceRedisName = getRedisServiceName();
                if (serviceRedisName.Equals(""))
                {
                    ManageError(ERROR_LEVEL.FATAL, "Database REDIS service not found", true);
                    return false;
                }

                ServiceController service = new ServiceController(serviceName);
				try
				{
					TimeSpan timeout = TimeSpan.FromSeconds(DATABASE_PROCESS_TIMEOUT);
					service.WaitForStatus(ServiceControllerStatus.Running, timeout);
				}
				catch (Exception ex)
				{
                    ManageError(ERROR_LEVEL.FATAL, "Database SQL not started", true);
                    return false;
                }
                               
                service = new ServiceController(serviceRedisName);
                try
                {
                    TimeSpan timeout = TimeSpan.FromSeconds(DATABASE_PROCESS_TIMEOUT);
                    service.WaitForStatus(ServiceControllerStatus.Running, timeout);
                }
                catch (Exception e)
                {
                    ManageError(ERROR_LEVEL.FATAL, "Database REDIS not started", true);
                    return false;
                }


				System.Data.Entity.Database.SetInitializer<DatabaseContext>(null);
				var migrator = new DbMigrator(new Configuration());

				if (migrator.GetPendingMigrations().Any())
				{
					// Run migrations and seed.
					migrator.Update();
				}

				FindOrCreateMachineUniqueId();

				using (MaintenancesController maintenancesController = new MaintenancesController())
				{
					maintenancesController.CheckDifferencesFromDbAndXml();
				}

				// Get functionality and PLC default false functionality
				using (FunctionsAccessController functionsAccess = new FunctionsAccessController())
				{
					FunctionsAccessConfig = functionsAccess.FindAll();
					AllFunctionalityDisabled = functionsAccess.FindAllFunctionsAndDisableAll();
				}

				using (QueueController queueController = new QueueController())
					queueController.ReadAndPopulateQueue();
			}
			catch (Exception ex)
			{
				ManageException(ERROR_LEVEL.FATAL, ex);
				return false;
			}

			return true;
		}

        private static void FindOrCreateMachineUniqueId()
		{
			// Find machine unique id in the register
			string uniqueId = ReadUniqueIdFromRegister();

			// If not found
			if (uniqueId == null || uniqueId == "")
			{
				if (!File.Exists("uniqueid.txt"))
				{
					uniqueId = Guid.NewGuid().ToString();
					// Save uinique id into file
					File.WriteAllText("uniqueid.txt", uniqueId);
					// Save uinique id in the registry
					WriteUniqueIdIntoRegister(uniqueId);
				}
				else
				{
					// Find machine unique id in the storage file
					uniqueId = File.ReadAllText("uniqueid.txt");

					// If null or empty
					if (uniqueId == null || uniqueId == "")
					{
						// Delete empty file and recreate
						File.Delete(uniqueId);
						FindOrCreateMachineUniqueId();
						return;
					}
					else
					{
						WriteUniqueIdIntoRegister(uniqueId);
					}
				}
			}

			// Set machine info into static server config
			using (MachinesController machinesController = new MachinesController())
			{
				MachineConfig = machinesController.FindMachineByUniqueId(uniqueId);
				if (MachineConfig == null)
				{
					// Create Machine inside database
					MachineConfig = machinesController.Create(uniqueId);
					using (UsersController usersController = new UsersController())
					{
						// Create default CMS user
						usersController.CreateCmsDefaultUserIfNotExists(MachineConfig.MachineId, "cms.service", "cmsserviceonly", "cms", "service", new CultureInfo("it"), ROLE_IDS.CMS_SERVICE);
						usersController.CreateCmsDefaultUserIfNotExists(MachineConfig.MachineId, "cms.ut", "cmsufficiotecnico", "cms", "ut", new CultureInfo("it"), ROLE_IDS.CMS_UT);

						// Create default CUSTOMER user
						usersController.CreateCmsDefaultUserIfNotExists(MachineConfig.MachineId, "admin", "admin", "customer", "admin", Config.ServerConfig.ServerStartupConfig.Language, ROLE_IDS.CUSTOMER_ADMIN);
						usersController.CreateCmsDefaultUserIfNotExists(MachineConfig.MachineId, "operator", "operator", "customer", "operator", Config.ServerConfig.ServerStartupConfig.Language, ROLE_IDS.CUSTOMER_OPERATOR);
						usersController.CreateCmsDefaultUserIfNotExists(MachineConfig.MachineId, "maintainer", "maintainer", "customer", "maintainer", Config.ServerConfig.ServerStartupConfig.Language, ROLE_IDS.CUSTOMER_MAINTAINER);
					}
				}
				else
				{
					// if config name is different than dabase name, update db
					if (MachineConfig.Model != NcConfig.NcName)
						machinesController.UpdateMachineName(MachineConfig.MachineId, NcConfig.NcName);
				}
			}
		}

		private static void WriteUniqueIdIntoRegister(string uniqueId)
		{
			// Get path to the HKEY_LOCAL_MACHINE/SOFTWARE
			RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE", true);
			// Create or get ..//CMS/Step subkey
			key = key.CreateSubKey("Cms").CreateSubKey("Active");
			// Set machine unique id Key
			key.SetValue(REGISTER_MACHINE_ID_KEY_NAME, uniqueId);
		}

		private static string ReadUniqueIdFromRegister()
		{
			// Get path to the HKEY_LOCAL_MACHINE/SOFTWARE
			RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE", true);
			// Get ..//CMS/Step subkey
			key = key.CreateSubKey("Cms").CreateSubKey("Active");
			// Return value
			return (string)key.GetValue(REGISTER_MACHINE_ID_KEY_NAME);
		}

        private static string getDbServiceName()
        {
            ServiceController[] services = ServiceController.GetServices();
            var service = services.FirstOrDefault(s => s.ServiceName == "MariaDB");
            if (service != null)
                return service.DisplayName;

            service = services.FirstOrDefault(s => s.ServiceName == "MySQL");
            if (service != null)
                return service.DisplayName;

            return "";

        }

        private static string getRedisServiceName()
        {
            ServiceController[] services = ServiceController.GetServices();
            var service = services.FirstOrDefault(s => s.ServiceName == "Redis");
            if (service != null)
                return service.DisplayName;

            return "";

        }
        
    }
}