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using System;
using System.Collections.ObjectModel;
using Firebase.Database.Streaming;
namespace Firebase.Database
{
/// <summary>
/// Extensions for <see cref="IObservable{T}" />.
/// </summary>
public static class ObservableExtensions
{
/// <summary>
/// Starts observing on given firebase observable and propagates event into an <see cref="ObservableCollection{T}" />.
/// </summary>
/// <param name="observable"> The observable. </param>
/// <typeparam name="T"> Type of entity. </typeparam>
/// <returns> The <see cref="ObservableCollection{T}" />. </returns>
public static ObservableCollection<T> AsObservableCollection<T>(this IObservable<FirebaseEvent<T>> observable)
{
var collection = new ObservableCollection<T>();
observable.Subscribe(f =>
{
if (f.EventType == FirebaseEventType.InsertOrUpdate)
{
var i = collection.IndexOf(f.Object);
if (i >= 0) collection.RemoveAt(i);
collection.Add(f.Object);
}
else
{
collection.Remove(f.Object);
}
});
return collection;
}
}
}
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