/* 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 OpenSearch.OpenSearch.Xunit.XunitPlumbing;
using OpenSearch.Net;
using FluentAssertions;
using Tests.Framework;

namespace Tests.ClientConcepts.ConnectionPooling.BuildingBlocks
{
	public class KeepingTrackOfNodes
	{

		/**=== Keeping track of nodes
		 */
		[U] public void Creating()
		{
			/** ==== Creating a Node
			* A `Node` can be instantiated by passing it a `Uri`
			*/
			var node = new Node(new Uri("http://localhost:9200"));
			node.Uri.Should().NotBeNull();
			node.Uri.Port.Should().Be(9200);

			/** By default cluster_manager eligible and holds data is presumed to be true **/
			node.ClusterManagerEligible.Should().BeTrue();
			node.HoldsData.Should().BeTrue();

			/** Is resurrected is true on first usage, hints to the transport that a ping might be useful */
			node.IsResurrected.Should().BeTrue();
			/**
			* When instantiating your connection pool you could switch these to false to initialize the client to
			* a known cluster topology.
			*/
		}
		[U] public void BuildingPaths()
		{
			/** ==== Building a Node path
			* passing a node with a path should be preserved.
			* Sometimes an OpenSearch node lives behind a proxy
			*/
			var node = new Node(new Uri("http://test.example/opensearch"));

			node.Uri.Port.Should().Be(80);
			node.Uri.AbsolutePath.Should().Be("/opensearch/");

			/** *We force paths to end with a forward slash* so that they can later be safely combined */
			var combinedPath = new Uri(node.Uri, "index/type/_search");
			combinedPath.AbsolutePath.Should().Be("/opensearch/index/type/_search");

			/** which is exactly what the `CreatePath` method does on `Node` */
			combinedPath = node.CreatePath("index/type/_search");
			combinedPath.AbsolutePath.Should().Be("/opensearch/index/type/_search");
		}

		/** ==== Marking Nodes */
		[U] public void MarkNodes()
		{
			var node = new Node(new Uri("http://localhost:9200"));
			node.FailedAttempts.Should().Be(0);
			node.IsAlive.Should().BeTrue();
			/**
			* every time a node is marked dead, the number of attempts should increase
			* and the passed datetime should be exposed.
			*/
			for(var i = 0; i<10;i++)
			{
				var deadUntil = DateTime.Now.AddMinutes(1);
				node.MarkDead(deadUntil);
				node.FailedAttempts.Should().Be(i + 1);
				node.IsAlive.Should().BeFalse();
				node.DeadUntil.Should().Be(deadUntil);
			}
			/** however when marking a node alive, the `DeadUntil` property should be reset and `FailedAttempts` reset to 0*/
			node.MarkAlive();
			node.FailedAttempts.Should().Be(0);
			node.DeadUntil.Should().Be(default(DateTime));
			node.IsAlive.Should().BeTrue();
		}

		[U] public void Equality()
		{
			/** ==== Node Equality
			* Nodes are considered equal if they have the same endpoint, no matter what other metadata is associated */
			var node = new Node(new Uri("http://localhost:9200")) { ClusterManagerEligible = false };
			var nodeAsClusterManager = new Node(new Uri("http://localhost:9200")) { ClusterManagerEligible = true };

			(node == nodeAsClusterManager).Should().BeTrue();
			(node != nodeAsClusterManager).Should().BeFalse();

			var uri = new Uri("http://localhost:9200");
			(node == uri).Should().BeTrue();

			var differentUri = new Uri("http://localhost:9201");
			(node != differentUri).Should().BeTrue();

			node.Should().Be(nodeAsClusterManager);
		}
	}
}