BudgetAnalyser.Engine.Services.BudgetMaintenanceService.CloneBudgetModel C# (CSharp) Method

        public BudgetModel CloneBudgetModel(BudgetModel sourceBudget, DateTime newBudgetEffectiveFrom)
        {
            if (sourceBudget == null)
            {
                throw new ArgumentNullException(nameof(sourceBudget));
            }

            if (newBudgetEffectiveFrom <= sourceBudget.EffectiveFrom)
            {
                throw new ArgumentException("The effective date of the new budget must be later than the other budget.", nameof(newBudgetEffectiveFrom));
            }

            if (newBudgetEffectiveFrom <= DateTime.Today)
            {
                throw new ArgumentException("The effective date of the new budget must be a future date.", nameof(newBudgetEffectiveFrom));
            }

            var validationMessages = new StringBuilder();
            if (!sourceBudget.Validate(validationMessages))
            {
                throw new ValidationWarningException(string.Format(CultureInfo.CurrentCulture, "The source budget is currently in an invalid state, unable to clone it at this time.\n{0}", validationMessages));
            }

            var newBudget = new BudgetModel
            {
                EffectiveFrom = newBudgetEffectiveFrom,
                Name = string.Format(CultureInfo.CurrentCulture, "Copy of {0}", sourceBudget.Name)
            };
            newBudget.Update(CloneBudgetIncomes(sourceBudget), CloneBudgetExpenses(sourceBudget));

            if (!newBudget.Validate(validationMessages))
            {
                throw new InvalidOperationException("New cloned budget is invalid but the source budget is ok. Code Error.\n" + validationMessages);
            }

            Budgets.Add(newBudget);
            this.budgetRepository.SaveAsync();
            UpdateServiceMonitor();
            return newBudget;
        }