BeWoPlaner/Data/Access/GenericDAO.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using BeWo.Data.Entities;

using BS.Shared;
using BS.Shared.Extensions;
using NHibernate;
using NHibernate.Criterion;
using NHibernate.Proxy;

namespace BeWo.Data.Access
{
    public class GenericDAO : AbstractBaseDAO
    {
        internal GenericDAO()
        {
        }

        public virtual void Deactivate(BeWoEntityBase pEntity)
        {
            Debug.WriteLine($"---->DEACTIVATE von {pEntity.GetType().FullName}");

            this.SetActivationType(pEntity, ActivationTypeId.Deleted);
        }

        public virtual void Deactivate<T>(IEnumerable<T> pEntitys) where T : BeWoEntityBase, new()
        {
            if(pEntitys?.FirstOrDefault() is object obj)
            {
                Debug.WriteLine($"---->DEACTIVATE von {obj.GetType().FullName}");
            }

            ITransaction lTransaction = this.Session.BeginTransaction();
            try
            {
                foreach (BeWoEntityBase iEntity in pEntitys)
                {
                    iEntity.IsActive = ActivationTypeId.Deleted;
                    if (iEntity.SystemEntryID == null)
                    {
                        this.Session.SaveOrUpdate(iEntity);
                    }
                    else
                    {
                        throw new InvalidOperationException("Can't delete System Entries");
                    }
                }

                lTransaction.Commit();
            }
            catch (Exception e)
            {
                lTransaction.Rollback();
                throw e;
            }
        }

        public virtual void Delete(BeWoEntityBase pEntity)
        {
            Debug.WriteLine($"---->DELETE von {pEntity.GetType().FullName}");

            if(pEntity.SystemEntryID is null)
            {
                LogSignatureDeletion(pEntity);

                var lTransaction = Session.BeginTransaction();

                try
                {
                    Session.Delete(pEntity);
                    lTransaction.Commit();
                }
                catch (Exception e)
                {
                    lTransaction.Rollback();
                    throw e;
                }
            }
            else
            {
                throw new InvalidOperationException("Can't delete System Entries");
            }
        }

        public virtual void Delete<T>(IEnumerable<T> pEntitys) where T : BeWoEntityBase, new()
        {
            if(pEntitys?.FirstOrDefault() is object obj)
            {
                Debug.WriteLine($"---->DELETE von {obj.GetType().FullName}");
            }
            

            var entities = pEntitys.ToList();

            foreach(var entity in entities)
            {
                LogSignatureDeletion(entity);
            }

            var lTransaction = Session.BeginTransaction();

            try
            {
                foreach(var iEntity in entities)
                {
					if(iEntity.SystemEntryID is null || iEntity.SystemEntryID.Value == SystemEntryID.AdditionalServiceAssessmentSheet)
                    {
                        Session.Delete(iEntity);
                    }
                    else
                    {
						throw new InvalidOperationException("Can't delete System Entries");
                    }
                }

                lTransaction.Commit();
            }
            catch (Exception e)
            {
                lTransaction.Rollback();
                throw e;
            }
        }

        public virtual IList<T> GetAll<T>() where T : BeWoEntityBase
        {
            return this.CreateCriteria<T>().List<T>();
        }

        public virtual IList<T> GetAllActive<T>() where T : BeWoEntityBase
        {
            return this.GetAllWithActivationType<T>(ActivationTypeId.Active);
        }

        public virtual IList<T> GetAllActiveAndArchived<T>() where T : BeWoEntityBase
        {
            return this.CreateCriteria<T>().Add(Restrictions.Or(Restrictions.Eq(BeWoEntityBase.PropertyName_IsActive, ActivationTypeId.Active), Restrictions.Eq(BeWoEntityBase.PropertyName_IsActive, ActivationTypeId.Archived))).List<T>();
        }

        public virtual IList<T> GetAllWithActivationType<T>(ActivationTypeId activationType) where T : BeWoEntityBase
        {
			return this.CreateCriteria<T>().Add(Restrictions.Eq(BeWoEntityBase.PropertyName_IsActive, activationType)).List<T>();
        }

        public virtual T GetByID<T>(long pOid) where T : BeWoEntityBase, new()
        {
            return this.Session.Get<T>(pOid);
        }

		public virtual IList<T> GetActiveByIDs<T>(IEnumerable<long> pOids) where T : BeWoEntityBase, new()
	    {
		    return CreateCriteria<T>().Add(Restrictions.Eq(BeWoEntityBase.PropertyName_IsActive, ActivationTypeId.Active)).Add(Restrictions.In(BeWoEntityBase.PropertyName_Oid, pOids.ToArray())).List<T>();
	    }

        public virtual void Insert(BeWoEntityBase pEntity)
        {
            var entityType = pEntity.GetType();

            Debug.WriteLine($"++++>INSERT von {entityType.FullName}");

            try
            {
                var session = Session;

                if(session is null)
                {
                    throw new InvalidOperationException("GenericDAO.Insert(): Session is null");
                }

                var lTransaction = session.BeginTransaction();
                
                try
                {
                    pEntity.IsActive = ActivationTypeId.Active;
                    session.Save(pEntity);
                    lTransaction.Commit();

                    if(pEntity is Signature signature)
                    {
                        LogSignatureInsert(signature);
                    }
                }
                catch (Exception e)
                {
                    lTransaction.Rollback();
                    throw e;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public virtual void Insert<T>(IEnumerable<T> pEntitys) where T : BeWoEntityBase, new()
        {
            if(pEntitys?.FirstOrDefault() is object obj)
            {
                Debug.WriteLine($"++++>INSERT von {obj.GetType().FullName}");
            }

            ITransaction lTransaction = this.Session.BeginTransaction();
            try
            {
                foreach (BeWoEntityBase iEntity in pEntitys)
                {
                    this.Session.Save(iEntity);
                }

                lTransaction.Commit();
            }
            catch (Exception e)
            {
                lTransaction.Rollback();
                throw e;
            }
        }

        public virtual T LoadByID<T>(long pOid) where T : BeWoEntityBase, new()
        {
            return this.Session.Load<T>(pOid);
        }

        public virtual List<T> LoadByIDs<T>(IEnumerable<long> pOids) where T : BeWoEntityBase, new()
        {
            return pOids.Select(oid => this.LoadByID<T>(oid)).ToList();
        }

        public virtual T LoadSystemEntry<T>(SystemEntryID pId) where T : BeWoEntityBase, new()
        {
            return this.CreateCriteria<T>().Add(Restrictions.Eq(BeWoEntityBase.PropertyName_SystemEntryID, pId)).UniqueResult<T>();
        }

        public void Reattach<T>(T entity) where T : BeWoEntityBase, new()
        {
            this.Session.Lock(entity, LockMode.None);
        }

        public virtual void SetActivationType(BeWoEntityBase pEntity, ActivationTypeId activationType)
        {
            if (pEntity.SystemEntryID == null)
            {
                ITransaction lTransaction = this.Session.BeginTransaction();
                try
                {
                    pEntity.IsActive = activationType;
                    this.Session.SaveOrUpdate(pEntity);
                    lTransaction.Commit();
                }
                catch (Exception e)
                {
                    lTransaction.Rollback();
                    throw e;
                }
            }
            else
            {
                throw new InvalidOperationException("Can't delete System Entries");
            }
        }

        public virtual void Update(BeWoEntityBase pEntity)
        {
            Debug.WriteLine($"####>UPDATE von {pEntity.GetType().FullName}");

            if(pEntity is ServiceRecord serviceRecord && serviceRecord.Oid.HasValue)
            {
                var hasPreviouslyExistingSignature = DAOFactory.SearchDAO.CheckForExistingServiceRecordSignature(serviceRecord.Oid.Value);

                if(hasPreviouslyExistingSignature && serviceRecord.SignatureOid is null)
                {
                    LogSignatureDeletion(serviceRecord);
                }
            }

            if(pEntity is Bargeldkasse bargeldkasse && bargeldkasse.Oid.HasValue)
            {
                var oldTransactions = DAOFactory.SearchDAO.LoadBargeldTransaktionenNonLazy(bargeldkasse.Oid.Value);

                var deletedTransactions = oldTransactions.Where(oldTransaction => false == bargeldkasse.Bargeldtransaktionen.Any(x => x.Oid.HasValue && x.Oid.Equals(oldTransaction.Oid))).ToList();

                var deletedTransactionsWithSignature = deletedTransactions.Where(oldTransaction => oldTransaction.SignatureOid.HasValue).ToList();

                foreach(var deletedTransactionWithSignature in deletedTransactionsWithSignature)
                {
                    LogSignatureDeletion(deletedTransactionWithSignature);
                }
            }

            ITransaction lTransaction = this.Session.BeginTransaction();
            try
            {
                this.Session.SaveOrUpdate(pEntity);
                lTransaction.Commit();
            }
            catch (Exception e)
            {
                lTransaction.Rollback();
                throw e;
            }
        }

        public virtual void Update<T>(IEnumerable<T> pEntities) where T : BeWoEntityBase, new()
        {
            if(pEntities?.FirstOrDefault() is object obj)
            {
                Debug.WriteLine($"####>UPDATE von {obj.GetType().FullName}");
            }

            ITransaction lTransaction = this.Session.BeginTransaction();
            try
            {
                if(pEntities is IEnumerable<ServiceRecord> serviceRecords)
                {
                    foreach(var serviceRecord in serviceRecords)
                    {
                        if(serviceRecord.Oid is null)
                        {
                            continue;
                        }

                        var hasPreviouslyExistingSignature = DAOFactory.SearchDAO.CheckForExistingServiceRecordSignature(serviceRecord.Oid.Value);

                        if(hasPreviouslyExistingSignature && serviceRecord.SignatureOid is null)
                        {
                            LogSignatureDeletion(serviceRecord);
                        }
                    }
                }

                if(pEntities is IEnumerable<Bargeldkasse> bargeldkassen)
                {
                    foreach(var bargeldkasse in bargeldkassen)
                    {
                        if(bargeldkasse.Oid is null)
                        {
                            continue;
                        }

                        var oldTransactions = DAOFactory.SearchDAO.LoadBargeldTransaktionenNonLazy(bargeldkasse.Oid.Value);

                        var deletedTransactions = oldTransactions.Where(oldTransaction => bargeldkasse.Bargeldtransaktionen.Any(x => x.Oid.HasValue && x.Oid.Equals(oldTransaction.Oid))).ToList();

                        var deletedTransactionsWithSignature = deletedTransactions.Where(oldTransaction => oldTransaction.SignatureOid.HasValue).ToList();

                        foreach(var deletedTransactionWithSignature in deletedTransactionsWithSignature)
                        {
                            LogSignatureDeletion(deletedTransactionWithSignature);
                        }
                    }
                }

                foreach (BeWoEntityBase iEntity in pEntities)
                {
                    this.Session.SaveOrUpdate(iEntity);
                }

                lTransaction.Commit();
            }
            catch (Exception e)
            {
                lTransaction.Rollback();
                throw e;
            }
        }

        public virtual T Unproxy<T>(T obj)
        {
            if (!NHibernateUtil.IsInitialized(obj))
            {
                NHibernateUtil.Initialize(obj);
            }

            if (obj is INHibernateProxy)
            {
                return (T)this.Session.GetSessionImplementation().PersistenceContext.Unproxy(obj);
            }
            return obj;
        }
        
        public virtual int GetRowCount<T>() where T : BeWoEntityBase
        {
            return Session.QueryOver<T>().RowCount();
		}

        private static void LogSignatureDeletion(BeWoEntityBase entity)
        {
            // ToDo: vorerst ausgesetzt, da versucht wird, ein Null-Objekt in die Datenbank zu schreiben.
            return;

            var signatureHistoryEntries = new List<SignatureHistory>();

            switch(entity)
            {
                case Signature signature:
                    signatureHistoryEntries.AddIfNotNull(DAOFactory.SearchDAO.CreateSignatureHistoryEntry(signature, SignatureEventType.Delete));
                break;
                case ConfirmationReceiptSignature confirmationReceiptSignature:
                    signatureHistoryEntries.AddIfNotNull(DAOFactory.SearchDAO.CreateMonthlySignatureHistoryEntry(confirmationReceiptSignature, SignatureEventType.Delete));
                break;
                case ServiceRecord serviceRecord when serviceRecord.Oid.HasValue:
                {
                    var s = DAOFactory.SearchDAO.LoadJustDeletedSignature(serviceRecord.Oid.Value, true);

                    var signatureHistoryEntry = DAOFactory.SearchDAO.CreateSignatureHistoryEntry(s, SignatureEventType.CascadingDelete);

                    signatureHistoryEntries.AddIfNotNull(signatureHistoryEntry);
                    break;
                }
                case Bargeldkasse bargeldkasse when bargeldkasse.Bargeldtransaktionen.Any(bargeldtransaktion => bargeldtransaktion.SignatureOid.HasValue):
                    signatureHistoryEntries.AddRange(DAOFactory.SearchDAO.CreateSignatureHistoryEntryForBargeldkasse(bargeldkasse));
                break;
                case Bargeldtransaktion bargeldtransaktion when bargeldtransaktion.SignatureOid.HasValue:
                    signatureHistoryEntries.AddIfNotNull(DAOFactory.SearchDAO.CreateSignatureHistoryForBargeldtransaktion(bargeldtransaktion, SignatureEventType.CascadingDelete));
                break;
            }

            if(signatureHistoryEntries.Any())
            {
                DAOFactory.GenericDAO.Insert(signatureHistoryEntries);
            }
        }

        private static void LogSignatureUpdateForServiceRecord(ServiceRecord  serviceRecord)
        {
            /*
             * Wird bei folgenden Szenarien ausgeführt:
             *
             * 1. Direkt nach dem Signature-Insert (Erst das Signature-Insert, dann das ServiceRecord-Update, um die SignatureOid in die ServiceRecord-Tabelle zu schreiben).
             * 2. Beim Löschen der Signature
             */

            var hasPreviouslyExistingSignature = DAOFactory.SearchDAO.CheckForExistingServiceRecordSignature(serviceRecord.Oid.Value);

            // Prüfen, ob es sich um ein Update, ausgelöst durch das Insert der Unterschrift, handelt.
            if(false == hasPreviouslyExistingSignature)
            {
                return;
            }

            var signatureHistory = DAOFactory.SearchDAO.CreateSignatureHistoryForServiceRecordUpdate(serviceRecord, SignatureEventType.CascadingDelete);
            DAOFactory.GenericDAO.Insert(signatureHistory);
        }

        private static void LogSignatureInsert(Signature signature)
        {
            var signatureHistory = DAOFactory.SearchDAO.CreateSignatureHistoryEntry(signature, SignatureEventType.Insert);
            DAOFactory.GenericDAO.Insert(signatureHistory);
        }
    }
}