/* 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;

namespace OpenSearch.Client
{
	public interface IConditionlessQuery : IQuery
	{
		QueryContainer Fallback { get; set; }
		QueryContainer Query { get; set; }
	}

	public class ConditionlessQueryDescriptor<T>
		: QueryDescriptorBase<ConditionlessQueryDescriptor<T>, IConditionlessQuery>
			, IConditionlessQuery where T : class
	{
		protected override bool Conditionless => (Self.Query == null || Self.Query.IsConditionless)
			&& (Self.Fallback == null || Self.Fallback.IsConditionless);

		QueryContainer IConditionlessQuery.Fallback { get; set; }
		QueryContainer IConditionlessQuery.Query { get; set; }

		public ConditionlessQueryDescriptor<T> Query(Func<QueryContainerDescriptor<T>, QueryContainer> querySelector) =>
			Assign(querySelector, (a, v) => a.Query = v?.Invoke(new QueryContainerDescriptor<T>()));

		public ConditionlessQueryDescriptor<T> Fallback(Func<QueryContainerDescriptor<T>, QueryContainer> querySelector) =>
			Assign(querySelector, (a, v) => a.Fallback = v?.Invoke(new QueryContainerDescriptor<T>()));
	}
}