using DTS.Common.Utilities.Logging;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;

namespace DTS.Common.Classes
{
    /// <summary>
    /// this is a helper class to avoid performance issues
    /// adding or removing a bulk sequence of items from the collection
    /// by firing just one notification rather than n
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class BulkObservableCollection<T> : ObservableCollection<T>
    {
        public void AddRange(IEnumerable<T> items)
        {
            try
            {
                // Turn off notifications (check if anyone is listening first)
                CheckReentrancy();
                foreach (var item in items) { Items.Add(item); }
                // Fire a single notification that the entire "Reset" happened
                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
                OnPropertyChanged(new PropertyChangedEventArgs(nameof(Count)));
            }
            catch( Exception ex)
            {
                APILogger.Log(ex);
            }
        }
        public void RemoveRange(IEnumerable<T> itemsToRemove)
        {
            try
            {
                CheckReentrancy();

                foreach (var item in itemsToRemove)
                {
                    Items.Remove(item);
                }

                // Fire one single notification for the entire operation
                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
                OnPropertyChanged(new PropertyChangedEventArgs(nameof(Count)));
            }
            catch( Exception ex)
            {
                APILogger.Log(ex);
            }
        }
    }
}