/* 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 class IndexNameResolver
	{
		private readonly IConnectionSettingsValues _connectionSettings;

		public IndexNameResolver(IConnectionSettingsValues connectionSettings)
		{
			connectionSettings.ThrowIfNull(nameof(connectionSettings));
			_connectionSettings = connectionSettings;
		}

		public string Resolve<T>() where T : class => Resolve(typeof(T));

		public string Resolve(IndexName i)
		{
			if (string.IsNullOrEmpty(i?.Name))
				return PrefixClusterName(i, Resolve(i?.Type));

			ValidateIndexName(i.Name);
			return PrefixClusterName(i, i.Name);
		}

		public string Resolve(Type type)
		{
			var indexName = _connectionSettings.DefaultIndex;
			var defaultIndices = _connectionSettings.DefaultIndices;
			if (defaultIndices != null && type != null)
			{
				if (defaultIndices.TryGetValue(type, out var value) && !string.IsNullOrEmpty(value))
					indexName = value;
			}
			ValidateIndexName(indexName);
			return indexName;
		}

		private static string PrefixClusterName(IndexName i, string name) => i.Cluster.IsNullOrEmpty() ? name : $"{i.Cluster}:{name}";

		// ReSharper disable once ParameterOnlyUsedForPreconditionCheck.Local
		private static void ValidateIndexName(string indexName)
		{
			if (string.IsNullOrWhiteSpace(indexName))
				throw new ArgumentException(
					"Index name is null for the given type and no default index is set. "
					+ "Map an index name using ConnectionSettings.DefaultMappingFor<TDocument>() "
					+ "or set a default index using ConnectionSettings.DefaultIndex()."
				);
		}
	}
}