/* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*
*  Licensed to Elasticsearch B.V. under one or more contributor
*  license agreements. See the NOTICE file distributed with
*  this work for additional information regarding copyright
*  ownership. Elasticsearch B.V. licenses this file to you under
*  the Apache License, Version 2.0 (the "License"); you may
*  not use this file except in compliance with the License.
*  You may obtain a copy of the License at
*
* 	http://www.apache.org/licenses/LICENSE-2.0
*
*  Unless required by applicable law or agreed to in writing,
*  software distributed under the License is distributed on an
*  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
*  KIND, either express or implied.  See the License for the
*  specific language governing permissions and limitations
*  under the License.
*/

using System;
using System.Collections.Generic;
using System.Threading;

namespace OpenSearch.Net
{
	public class StickyConnectionPool : StaticConnectionPool
	{
		public StickyConnectionPool(IEnumerable<Uri> uris, IDateTimeProvider dateTimeProvider = null)
			: base(uris, false, dateTimeProvider) { }

		public StickyConnectionPool(IEnumerable<Node> nodes, IDateTimeProvider dateTimeProvider = null)
			: base(nodes, false, dateTimeProvider) { }

		public override IEnumerable<Node> CreateView(Action<AuditEvent, Node> audit = null)
		{
			var nodes = AliveNodes;

			if (nodes.Count == 0)
			{
				var globalCursor = Interlocked.Increment(ref GlobalCursor);

				//could not find a suitable node retrying on first node off globalCursor
				yield return RetryInternalNodes(globalCursor, audit);

				yield break;
			}

			// If the cursor is greater than the default then it's been
			// set already but we now have a live node so we should reset it
			if (GlobalCursor > -1)
				Interlocked.Exchange(ref GlobalCursor, -1);

			var localCursor = 0;
			foreach (var aliveNode in SelectAliveNodes(localCursor, nodes, audit))
				yield return aliveNode;
		}

		public override void Reseed(IEnumerable<Node> nodes) { }
	}
}