/* 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.Linq;
using System.Runtime.Serialization;

namespace OpenSearch.Client
{
	/// <summary>
	/// A Multi termvectors API request
	/// </summary>
	[MapsApi("mtermvectors.json")]
	public partial interface IMultiTermVectorsRequest
	{
		/// <summary>
		/// The documents for which to generate term vectors
		/// </summary>
		[DataMember(Name = "docs")]
		IEnumerable<IMultiTermVectorOperation> Documents { get; set; }

		/// <summary>
		/// The ids of documents within the same index and type
		/// for which to generate term vectors. Must be used in
		/// conjunction with <see cref="Index" /> and <see cref="Type" />
		/// </summary>
		[DataMember(Name = "ids")]
		IEnumerable<Id> Ids { get; set; }
	}

	/// <inheritdoc cref="IMultiTermVectorsRequest" />
	public partial class MultiTermVectorsRequest
	{
		/// <inheritdoc />
		public IEnumerable<IMultiTermVectorOperation> Documents { get; set; }

		/// <inheritdoc />
		public IEnumerable<Id> Ids { get; set; }
	}

	/// <inheritdoc cref="IMultiTermVectorsRequest" />
	public partial class MultiTermVectorsDescriptor
	{
		private List<IMultiTermVectorOperation> _operations;

		IEnumerable<IMultiTermVectorOperation> IMultiTermVectorsRequest.Documents
		{
			get => _operations;
			set => _operations = value?.ToList();
		}

		IEnumerable<Id> IMultiTermVectorsRequest.Ids { get; set; }

		private List<IMultiTermVectorOperation> Operations =>
			_operations ?? (_operations = new List<IMultiTermVectorOperation>());

		/// <summary>
		/// A document for which to generate term vectors
		/// </summary>
		public MultiTermVectorsDescriptor Documents<T>(Func<MultiTermVectorOperationDescriptor<T>, IMultiTermVectorOperation> selector)
			where T : class
		{
			Operations.AddIfNotNull(selector?.Invoke(new MultiTermVectorOperationDescriptor<T>()));
			return this;
		}

		/// <inheritdoc cref="IMultiTermVectorsRequest.Documents" />
		public MultiTermVectorsDescriptor Documents<T>(IEnumerable<long> ids,
			Func<MultiTermVectorOperationDescriptor<T>, long, IMultiTermVectorOperation> selector = null
		)
			where T : class
		{
			foreach (var id in ids)
				Operations.Add(selector.InvokeOrDefault(new MultiTermVectorOperationDescriptor<T>().Id(id), id));

			return this;
		}

		/// <inheritdoc cref="IMultiTermVectorsRequest.Documents" />
		public MultiTermVectorsDescriptor Documents<T>(IEnumerable<string> ids,
			Func<MultiTermVectorOperationDescriptor<T>, string, IMultiTermVectorOperation> getSelector = null
		)
			where T : class
		{
			foreach (var id in ids)
				Operations.Add(getSelector.InvokeOrDefault(new MultiTermVectorOperationDescriptor<T>().Id(id), id));

			return this;
		}

		/// <inheritdoc cref="IMultiTermVectorsRequest.Documents" />
		public MultiTermVectorsDescriptor Documents<T>(IEnumerable<Id> ids,
			Func<MultiTermVectorOperationDescriptor<T>, Id, IMultiTermVectorOperation> getSelector = null
		)
			where T : class
		{
			foreach (var id in ids)
				Operations.Add(getSelector.InvokeOrDefault(new MultiTermVectorOperationDescriptor<T>().Id(id), id));

			return this;
		}

		/// <inheritdoc cref="IMultiTermVectorsRequest.Ids" />
		public MultiTermVectorsDescriptor Ids(IEnumerable<Id> ids) => Assign(ids, (a, v) => a.Ids = v);

		/// <inheritdoc cref="IMultiTermVectorsRequest.Ids" />
		public MultiTermVectorsDescriptor Ids(params Id[] ids) => Assign(ids, (a, v) => a.Ids = v);
	}
}