/// <summary>
        /// Approves an entity.
        /// Since CollectionViewModelBase is a POCO view model, an the instance of this class will also expose the ApproveCommand property that can be used as a binding source in views.
        /// </summary>
        /// <param name="projectionEntity">An entity to approve.</param>
        public void Approve(VARIATION entity)
        {
            string errorMessage = string.Empty;

            if (entity == null)
            {
                errorMessage = "Nothing within variation to approve";
            }
            else if (loadPROJECT == null)
            {
                errorMessage = "Project doesn't exists";
            }
            else if (loadBASELINE == null)
            {
                errorMessage = "Live baseline doesn't exists";
            }
            else if (loadPROGRESS == null)
            {
                errorMessage = "Live progress doesn't exists";
            }

            if (errorMessage != string.Empty)
            {
                MessageBoxService.ShowMessage(errorMessage);
                return;
            }

            IBluePrintsEntitiesUnitOfWork unitOfWork = bluePrintsUnitOfWorkFactory.CreateUnitOfWork();
            BASELINE LiveBASELINE = loadBASELINE;
            IEnumerable <VARIATION_ITEM> editVARIATION_ITEMS = unitOfWork.VARIATION_ITEMS.Where(x => x.GUID_VARIATION == entity.GUID).ToArray().AsEnumerable();
            IEnumerable <BASELINE_ITEM>  addBASELINE_ITEMS   = unitOfWork.BASELINE_ITEMS.Where(x => x.GUID_VARIATION == entity.GUID && x.GUID_BASELINE == null).ToArray().AsEnumerable();
            IQueryable <BASELINE_ITEM>   editBASELINE_ITEMS  = loaderCollection.GetCollection <BASELINE_ITEM>();
            IEnumerable <PROGRESS_ITEM>  livePROGRESS_ITEMS  = loaderCollection.GetCollection <PROGRESS_ITEM>();

            BASELINE newBASELINE = new BASELINE();

            DataUtils.ShallowCopy(newBASELINE, LiveBASELINE);
            newBASELINE.GUID     = Guid.Empty;
            newBASELINE.REVISION = ((char)(LiveBASELINE.REVISION.Last() + 1)).ToString();
            //not saving new baseline as live yet because editBASELINE_ITEMS still depends on the current live baseline for copying BASELINE_ITEMS
            newBASELINE.STATUS = BaselineStatus.Superseded;

            CollectionViewModel <BASELINE, BASELINE, Guid, IBluePrintsEntitiesUnitOfWork>           BASELINECollectionViewModel      = (CollectionViewModel <BASELINE, BASELINE, Guid, IBluePrintsEntitiesUnitOfWork>)loaderCollection.GetViewModel <BASELINE>();
            CollectionViewModel <BASELINE_ITEM, BASELINE_ITEM, Guid, IBluePrintsEntitiesUnitOfWork> BASELINE_ITEMCollectionViewModel = (CollectionViewModel <BASELINE_ITEM, BASELINE_ITEM, Guid, IBluePrintsEntitiesUnitOfWork>)loaderCollection.GetViewModel <BASELINE_ITEM>();

            BASELINECollectionViewModel.Save(newBASELINE);

            entity.APPROVED         = DateTime.Now;
            entity.GUID_ORIBASELINE = LiveBASELINE.GUID;
            entity.GUID_BASELINE    = newBASELINE.GUID;
            MainViewModel.Save(entity);

            ObservableCollection <BASELINE_ITEM> newBASELINE_ITEMS = new ObservableCollection <BASELINE_ITEM>();

            foreach (BASELINE_ITEM editBASELINE_ITEM in editBASELINE_ITEMS)
            {
                BASELINE_ITEM copyBASELINE_ITEM = new BASELINE_ITEM();
                DataUtils.ShallowCopy(copyBASELINE_ITEM, editBASELINE_ITEM);

                VARIATION_ITEM editVARIATION_ITEM = editVARIATION_ITEMS.FirstOrDefault(x => x.GUID_ORIBASEITEM == editBASELINE_ITEM.GUID_ORIGINAL);
                if (editVARIATION_ITEM != null)
                {
                    if (editVARIATION_ITEM.ACTION == VariationAction.Cancel)
                    {
                        decimal progressItemEARNED_UNITS = livePROGRESS_ITEMS.Where(x => x.GUID_ORIBASEITEM == editBASELINE_ITEM.GUID_ORIGINAL).Sum(y => y.EARNED_UNITS);
                        if (progressItemEARNED_UNITS == 0)
                        {
                            copyBASELINE_ITEM.DC_HOURS = -1 * copyBASELINE_ITEM.ESTIMATED_HOURS;
                        }
                        else
                        {
                            copyBASELINE_ITEM.DC_HOURS = -1 * (copyBASELINE_ITEM.TOTAL_HOURS - progressItemEARNED_UNITS);
                        }
                    }
                    else if (editVARIATION_ITEM.ACTION == VariationAction.Append)
                    {
                        copyBASELINE_ITEM.DC_HOURS += editVARIATION_ITEM.VARIATION_UNITS;
                    }

                    if (editVARIATION_ITEM.ACTION != VariationAction.NoAction)
                    {
                        copyBASELINE_ITEM.GUID_VARIATION = entity.GUID;
                    }
                }

                copyBASELINE_ITEM.GUID          = Guid.Empty;
                copyBASELINE_ITEM.GUID_BASELINE = newBASELINE.GUID;
                newBASELINE_ITEMS.Add(copyBASELINE_ITEM);
            }

            foreach (BASELINE_ITEM addBASELINE_ITEM in addBASELINE_ITEMS)
            {
                BASELINE_ITEM newBASELINE_ITEM = new BASELINE_ITEM();
                DataUtils.ShallowCopy(newBASELINE_ITEM, addBASELINE_ITEM);
                newBASELINE_ITEM.GUID          = Guid.Empty;
                newBASELINE_ITEM.GUID_BASELINE = newBASELINE.GUID;
                newBASELINE_ITEM.INTERNAL_NUM  = BluePrintDataUtils.BASELINEITEM_Generate_InternalNumber(this.loadPROJECT, newBASELINE_ITEM, newBASELINE_ITEMS, addBASELINE_ITEM.AREA, addBASELINE_ITEM.DISCIPLINE, addBASELINE_ITEM.DOCTYPE);
                VARIATION_ITEM editVARIATION_ITEM = editVARIATION_ITEMS.First(x => x.GUID_ORIBASEITEM == newBASELINE_ITEM.GUID_ORIGINAL);
                newBASELINE_ITEM.DC_HOURS       = editVARIATION_ITEM.VARIATION_UNITS;
                newBASELINE_ITEM.GUID_VARIATION = entity.GUID;

                newBASELINE_ITEMS.Add(newBASELINE_ITEM);
            }

            foreach (BASELINE_ITEM newBASELINE_ITEM in newBASELINE_ITEMS)
            {
                BASELINE_ITEMCollectionViewModel.Save(newBASELINE_ITEM);
            }

            LiveBASELINE.STATUS = BaselineStatus.Superseded;
            BASELINECollectionViewModel.Save(LiveBASELINE);
            newBASELINE.STATUS = BaselineStatus.Live;
            BASELINECollectionViewModel.Save(newBASELINE);
        }
        /// <summary>
        /// Generate internal number1 when all required fields are populated
        /// </summary>
        public static string BASELINEITEM_Generate_InternalNumber(PROJECT fromPROJECT, BASELINE_ITEM fromBASELINE_ITEM, IEnumerable <BASELINE_ITEM> BASELINE_ITEMEntities, AREA selectedAREA, DISCIPLINE selectedDISCIPLINE, DOCTYPE selectedDOCTYPE)
        {
            if (selectedAREA != null && selectedDISCIPLINE != null && selectedDOCTYPE != null)
            {
                string InternalNum = fromPROJECT.NUMBER;
                InternalNum += "-" + selectedAREA.INTERNAL_NUM;
                InternalNum += selectedDOCTYPE.CODE;
                InternalNum += selectedDISCIPLINE.CODE;

                int InternalNameCount = BASELINE_ITEMEntities.Count(obj => obj.INTERNAL_NUM != null && obj.INTERNAL_NUM.Contains(InternalNum)) + 1;

                InternalNum += InternalNameCount.ToString();

                return(InternalNum);
            }
            else
            {
                return(string.Empty);
            }
        }
 public BASELINE_ITEMProjection()
 {
     BASELINE_ITEM = new BASELINE_ITEM();
 }