/* 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.Linq.Expressions;
using System.Runtime.Serialization;
using OpenSearch.Net.Utf8Json;

namespace OpenSearch.Client
{
	/// <summary>
	/// The percolate query can be used to match queries stored in an index
	/// </summary>
	[InterfaceDataContract]
	[ReadAs(typeof(PercolateQuery))]
	public interface IPercolateQuery : IQuery
	{
		/// <summary>
		/// The source of the document to percolate.
		/// </summary>
		[DataMember(Name = "document")]
		[JsonFormatter(typeof(SourceFormatter<object>))]
		object Document { get; set; }

		/// <summary>
		/// The source of the documents to percolate. Like <see cref="Document" /> but allows
		/// multiple documents to be percolated.
		/// </summary>
		[DataMember(Name = "documents")]
		[JsonFormatter(typeof(SourceFormatter<IEnumerable<object>>))]
		IEnumerable<object> Documents { get; set; }

		/// <summary>
		/// The name of the field containing the percolated query on an existing document. This is a required parameter.
		/// </summary>
		[DataMember(Name = "field")]
		Field Field { get; set; }

		/// <summary>
		/// The id of the document to fetch for percolation.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document" />
		/// </summary>
		[DataMember(Name = "id")]
		Id Id { get; set; }

		/// <summary>
		/// The index the document resides in for percolation.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document" />
		/// </summary>
		[DataMember(Name = "index")]
		IndexName Index { get; set; }

		/// <summary>
		/// Preference to be used to fetch the document to percolate.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document" />
		/// </summary>
		[DataMember(Name = "preference")]
		string Preference { get; set; }

		/// <summary>
		/// Routing to be used to fetch the document to percolate.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document" />
		/// </summary>
		[DataMember(Name = "routing")]
		Routing Routing { get; set; }

		/// <summary>
		/// The expected version of the document to be fetched for percolation.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document" />
		/// </summary>
		[DataMember(Name = "version")]
		long? Version { get; set; }
	}

	/// <summary>
	/// The percolate query can be used to match queries stored in an index
	/// </summary>
	public class PercolateQuery : QueryBase, IPercolateQuery
	{
		private Routing _routing;

		/// <inheritdoc />
		public object Document { get; set; }

		/// <inheritdoc />
		public IEnumerable<object> Documents { get; set; }

		/// <inheritdoc />
		public Field Field { get; set; }

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

		/// <inheritdoc />
		public IndexName Index { get; set; }

		/// <inheritdoc />
		public string Preference { get; set; }

		/// <inheritdoc />
		public Routing Routing
		{
			get => _routing ?? (Document == null ? null : new Routing(Document));
			set => _routing = value;
		}

		/// <inheritdoc />
		public long? Version { get; set; }

		protected override bool Conditionless => IsConditionless(this);

		internal override void InternalWrapInContainer(IQueryContainer c) => c.Percolate = this;

		internal static bool IsConditionless(IPercolateQuery q)
		{
			var docFields = q.Document == null && q.Documents == null;
			if (!docFields) return false;

			return q.Index == null ||
				q.Id.IsConditionless() ||
				q.Field.IsConditionless();
		}
	}

	/// <summary>
	/// The percolate query can be used to match queries stored in an index
	/// </summary>
	/// <typeparam name="T">The document type that contains the percolated query</typeparam>
	public class PercolateQueryDescriptor<T>
		: QueryDescriptorBase<PercolateQueryDescriptor<T>, IPercolateQuery>
			, IPercolateQuery where T : class
	{
		private Routing _routing;

		protected override bool Conditionless => PercolateQuery.IsConditionless(this);
		object IPercolateQuery.Document { get; set; }
		IEnumerable<object> IPercolateQuery.Documents { get; set; }
		Field IPercolateQuery.Field { get; set; }
		Id IPercolateQuery.Id { get; set; }
		IndexName IPercolateQuery.Index { get; set; }

		string IPercolateQuery.Preference { get; set; }

		Routing IPercolateQuery.Routing
		{
			get => _routing ?? (Self.Document == null ? null : new Routing(Self.Document));
			set => _routing = value;
		}

		long? IPercolateQuery.Version { get; set; }

		/// <inheritdoc cref="IPercolateQuery.Field" />
		public PercolateQueryDescriptor<T> Field(Field field) => Assign(field, (a, v) => a.Field = v);

		/// <inheritdoc cref="IPercolateQuery.Field" />
		public PercolateQueryDescriptor<T> Field<TValue>(Expression<Func<T, TValue>> objectPath) => Assign(objectPath, (a, v) => a.Field = v);

		/// <inheritdoc cref="IPercolateQuery.Document" />
		public PercolateQueryDescriptor<T> Document<TDocument>(TDocument document) => Assign(document, (a, v) => a.Document = v);

		/// <inheritdoc cref="IPercolateQuery.Documents" />
		public PercolateQueryDescriptor<T> Documents<TDocument>(params TDocument[] documents) =>
			Assign(documents.Cast<object>(), (a, v) => a.Documents = v);

		/// <inheritdoc cref="IPercolateQuery.Documents" />
		public PercolateQueryDescriptor<T> Documents<TDocument>(IEnumerable<TDocument> documents) =>
			Assign(documents.Cast<object>(), (a, v) => a.Documents = v);

		/// <inheritdoc cref="IPercolateQuery.Id" />
		public PercolateQueryDescriptor<T> Id(string id) => Assign(id, (a, v) => a.Id = v);

		/// <summary>
		/// The index the document resides in for percolation.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document{TDocument}" />
		/// </summary>
		public PercolateQueryDescriptor<T> Index(IndexName index) => Assign(index, (a, v) => a.Index = v);

		/// <summary>
		/// The index the document resides in for percolation.
		/// Can be specified to percolate an existing document instead of providing <see cref="Document{TDocument}" />
		/// </summary>
		public PercolateQueryDescriptor<T> Index<TDocument>() => Assign(typeof(TDocument), (a, v) => a.Index = v);

		/// <inheritdoc cref="IPercolateQuery.Routing" />
		public PercolateQueryDescriptor<T> Routing(Routing routing) => Assign(routing, (a, v) => a.Routing = v);

		/// <inheritdoc cref="IPercolateQuery.Preference" />
		public PercolateQueryDescriptor<T> Preference(string preference) => Assign(preference, (a, v) => a.Preference = v);

		/// <inheritdoc cref="IPercolateQuery.Version" />
		public PercolateQueryDescriptor<T> Version(long? version) => Assign(version, (a, v) => a.Version = v);
	}
}