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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Firebase.Database.Streaming;
namespace Firebase.Database.Query
{
/// <summary>
/// The FirebaseQuery interface.
/// </summary>
public interface IFirebaseQuery
{
/// <summary>
/// Gets the owning client of this query.
/// </summary>
FirebaseClient Client { get; }
/// <summary>
/// Retrieves items which exist on the location specified by this query instance.
/// </summary>
/// <param name="timeout"> Optional timeout value. </param>
/// <typeparam name="T"> Type of the items. </typeparam>
/// <returns> Collection of <see cref="FirebaseObject{T}" />. </returns>
Task<IReadOnlyCollection<FirebaseObject<T>>> OnceAsync<T>(TimeSpan? timeout = null);
/// <summary>
/// Returns current location as an observable which allows to real-time listening to events from the firebase server.
/// </summary>
/// <typeparam name="T"> Type of the items. </typeparam>
/// <returns> Cold observable of <see cref="FirebaseEvent{T}" />. </returns>
IObservable<FirebaseEvent<T>> AsObservable<T>(
EventHandler<ExceptionEventArgs<FirebaseException>> exceptionHandler, string elementRoot = "");
/// <summary>
/// Builds the actual url of this query.
/// </summary>
/// <returns> The <see cref="string" />. </returns>
Task<string> BuildUrlAsync();
}
}
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