/* 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.IO;
using System.Linq;

namespace Tests.Configuration
{
	public class YamlConfiguration : TestConfigurationBase
	{
		private readonly Dictionary<string, string> _config;

		public YamlConfiguration(string configurationFile)
		{
			if (!File.Exists(configurationFile)) return;

			_config = File.ReadAllLines(configurationFile)
				.Where(l => !l.Trim().StartsWith("#") && !string.IsNullOrWhiteSpace(l))
				.ToDictionary(ConfigName, ConfigValue);

			Mode = GetTestMode(_config["mode"]);
			var version = _config["opensearch_version"];
			OpenSearchVersion = version;
			if (string.IsNullOrWhiteSpace(version))
				throw new Exception("No default version was set in test.yaml or test.default.yaml");
			ForceReseed = BoolConfig("force_reseed", false);
			TestOnlyOne = BoolConfig("test_only_one", false);
			TestAgainstAlreadyRunningOpenSearch = BoolConfig("test_against_already_running_opensearch", true);
			ClusterFilter = _config.ContainsKey("cluster_filter") ? _config["cluster_filter"] : null;
			TestFilter = _config.ContainsKey("test_filter") ? _config["test_filter"] : null;

			var externalSeed = _config.TryGetValue("seed", out var seed) ? int.Parse(seed) : (int?)null;
			SetExternalSeed(externalSeed, out var randomizer);
			Random = new RandomConfiguration
			{
				SourceSerializer = RandomBool("source_serializer", randomizer),
				TypedKeys = RandomBool("typed_keys", randomizer),
				HttpCompression = RandomBool("http_compression", randomizer),
			};
		}

		private bool BoolConfig(string key, bool @default) => _config.TryGetValue(key, out var v) ? bool.Parse(v) : @default;

		private bool RandomBool(string key, Random random) =>
			_config.TryGetValue($"random_{key}", out var v) ? bool.Parse(v) : random.NextDouble() >= 0.5;

		private static string ConfigName(string configLine) => Parse(configLine, 0);

		private static string ConfigValue(string configLine) => Parse(configLine, 1);

		private static string Parse(string configLine, int index) => configLine.Split(':')[index].Trim(' ');

		private static TestMode GetTestMode(string mode)
		{
			switch (mode)
			{
				case "unit":
				case "u":
					return TestMode.Unit;
				case "integration":
				case "i":
					return TestMode.Integration;
				case "mixed":
				case "m":
					return TestMode.Mixed;
				default:
					throw new ArgumentException($"Unknown test mode: {mode}");
			}
		}
	}
}