/* 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.Collections.Generic;
using System.Collections.Immutable;
using System.Collections.ObjectModel;
using System.Linq;
using ApiGenerator.Configuration;
using ApiGenerator.Domain.Specification;

namespace ApiGenerator.Domain
{
    public class EnumDescription
    {
        public string Name { get; set; }
        public IEnumerable<string> Options { get; set; }
    }

    public class RestApiSpec
    {
		public IDictionary<string, ApiEndpoint> Endpoints { get; set; }

        public ImmutableSortedDictionary<string, ReadOnlyCollection<ApiEndpoint>> EndpointsPerNamespaceLowLevel =>
            Endpoints.Values.GroupBy(e=>e.CsharpNames.Namespace)
                .ToImmutableSortedDictionary(kv => kv.Key, kv => kv.ToList().AsReadOnly());

        public ImmutableSortedDictionary<string, ReadOnlyCollection<ApiEndpoint>> EndpointsPerNamespaceHighLevel =>
            Endpoints.Values
                .Where(v => !CodeConfiguration.IgnoreHighLevelApi(v.Name))
                .GroupBy(e => e.CsharpNames.Namespace)
                .ToImmutableSortedDictionary(kv => kv.Key, kv => kv.ToList().AsReadOnly());


        private IEnumerable<EnumDescription> _enumDescriptions;
        public IEnumerable<EnumDescription> EnumsInTheSpec
        {
            get
            {
                if (_enumDescriptions != null) return _enumDescriptions;

                string CreateName(string name, string methodName, string @namespace)
                {
                    if (
                        name.ToLowerInvariant().Contains("metric")
                         ||(name.ToLowerInvariant() == "status")
                         ||(name.ToLowerInvariant() == "format")
                    )
                    {
                        if (methodName.StartsWith(@namespace))
                            return methodName + name;
                        else
                            return @namespace + methodName + name;
                    }

                    return name;
                }

                var urlParameterEnums = (
                    from e in Endpoints.Values
                    from para in e.Url.Params.Values
                    where para.Options != null && para.Options.Any()
                    let name = CreateName(para.ClsName, e.CsharpNames.MethodName, e.CsharpNames.Namespace)
                    where name != "Time"
                    select new EnumDescription
                    {
                        Name = name,
                        Options = para.Options
                    }).ToList();

                var urlPartEnums = (
                    from e in Endpoints.Values
                    from part in e.Url.Parts
                    where part.Options != null && part.Options.Any()
                    select new EnumDescription
                    {
                        Name = CreateName(part.Name.ToPascalCase(), e.CsharpNames.MethodName, e.CsharpNames.Namespace),
                        Options = part.Options
                    }).ToList();

                _enumDescriptions = urlPartEnums
                    .Concat(urlParameterEnums)
                    .DistinctBy(e => e.Name)
                    .ToList();

				return _enumDescriptions;
            }
        }
    }
}