/* 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.Text.RegularExpressions;
using OpenSearch.OpenSearch.Xunit.XunitPlumbing;
using OpenSearch.Net;
using FluentAssertions;
using OpenSearch.Client;

namespace Tests.Core.Connection.MetaData
{
	public class MetaHeaderProviderTests
	{
		private readonly Regex _validHeaderRegex = new Regex(@"^[a-z]{1,}=[a-z0-9\.\-]{1,}(?:,[a-z]{1,}=[a-z0-9\.\-]+)*$");
		private readonly Regex _validVersionRegex = new Regex(@"^[0-9]{1,2}\.[0-9]{1,2}(?:\.[0-9]{1,3})?p?$");
		private readonly Regex _validHttpClientPart = new Regex(@"^[a-z]{2,3}=[0-9]{1,2}\.[0-9]{1,2}(?:\.[0-9]{1,3})?p?$");

		[U] public void HeaderName_ReturnsExpectedValue()
		{
			var sut = new MetaHeaderProvider();
			sut.HeaderName.Should().Be("opensearch-client-meta");
		}

		[U] public void HeaderName_ReturnsNullWhenDisabled()
		{
			var sut = new MetaHeaderProvider();

			var connectionSettings = new ConnectionSettings()
				.DisableMetaHeader(true);

			var requestData = new RequestData(HttpMethod.POST, "/_search", "{}", connectionSettings,
				new SearchRequestParameters(),
				new RecyclableMemoryStreamFactory());

			sut.ProduceHeaderValue(requestData).Should().BeNull();
		}

		[U] public void HeaderName_ReturnsExpectedValue_ForSyncRequest_WhenNotDisabled()
		{
			var sut = new MetaHeaderProvider();

			var connectionSettings = new ConnectionSettings();

			var requestData = new RequestData(HttpMethod.POST, "/_search", "{}", connectionSettings,
				new SearchRequestParameters(),
				new RecyclableMemoryStreamFactory())
			{
				IsAsync = false
			};

			var result = sut.ProduceHeaderValue(requestData);

			_validHeaderRegex.Match(result).Success.Should().BeTrue();

			var parts = result.Split(',');
			parts.Length.Should().Be(4);

			parts[0].Should().StartWith("opensearch=");
			var clientVersion = parts[0].Substring(11);
			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();

			parts[1].Should().Be("a=0");

			parts[2].Should().StartWith("net=");
			var runtimeVersion = parts[2].Substring(4);
			_validVersionRegex.Match(runtimeVersion).Success.Should().BeTrue();

			_validHttpClientPart.Match(parts[3]).Success.Should().BeTrue();
		}

		[U] public void HeaderName_ReturnsExpectedValue_ForAsyncRequest_WhenNotDisabled()
		{
			var sut = new MetaHeaderProvider();

			var connectionSettings = new ConnectionSettings();

			var requestData = new RequestData(HttpMethod.POST, "/_search", "{}", connectionSettings,
				new SearchRequestParameters(),
				new RecyclableMemoryStreamFactory())
			{
				IsAsync = true
			};

			var result = sut.ProduceHeaderValue(requestData);

			_validHeaderRegex.Match(result).Success.Should().BeTrue();

			var parts = result.Split(',');
			parts.Length.Should().Be(4);

			parts[0].Should().StartWith("opensearch=");
			var clientVersion = parts[0].Substring(11);
			_validVersionRegex.Match(clientVersion).Success.Should().BeTrue();

			parts[1].Should().Be("a=1");

			parts[2].Should().StartWith("net=");
			var runtimeVersion = parts[2].Substring(4);
			_validVersionRegex.Match(runtimeVersion).Success.Should().BeTrue();

			_validHttpClientPart.Match(parts[3]).Success.Should().BeTrue();
		}
	}
}