/* 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;

namespace OpenSearch.Client
{
	public interface IAllocationAwarenessSettings
	{
		/// <summary>Determines which node attributes are taken into account when balancing shards across the shards</summary>
		IEnumerable<string> Attributes { get; set; }

		/// <summary>With forced awareness shard copies are NEVER allicated within the same attribute</summary>
		IAllocationAttributes Forced { get; set; }
	}

	public class AllocationAwarenessSettings : IAllocationAwarenessSettings
	{
		/// <inheritdoc />
		public IEnumerable<string> Attributes { get; set; }

		/// <inheritdoc />
		public IAllocationAttributes Forced { get; set; }
	}

	public class AllocationAwarenessSettingsDescriptor
		: DescriptorBase<AllocationAwarenessSettingsDescriptor, IAllocationAwarenessSettings>, IAllocationAwarenessSettings
	{
		/// <inheritdoc />
		IEnumerable<string> IAllocationAwarenessSettings.Attributes { get; set; }

		/// <inheritdoc />
		IAllocationAttributes IAllocationAwarenessSettings.Forced { get; set; }

		/// <inheritdoc />
		public AllocationAwarenessSettingsDescriptor Attributes(IEnumerable<string> attributes) => Assign(attributes, (a, v) => a.Attributes = v);

		/// <inheritdoc />
		public AllocationAwarenessSettingsDescriptor Attributes(params string[] attributes) => Assign(attributes, (a, v) => a.Attributes = v);

		/// <inheritdoc />
		public AllocationAwarenessSettingsDescriptor Force(IAllocationAttributes forceValues) => Assign(forceValues, (a, v) => a.Forced = v);

		/// <inheritdoc />
		public AllocationAwarenessSettingsDescriptor Force(Func<AllocationAttributesDescriptor, IAllocationAttributes> selector) =>
			Assign(selector, (a, v) => a.Forced = v?.Invoke(new AllocationAttributesDescriptor()));
	}
}