// <copyright file="LogScopeBenchmarks.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed 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.
// </copyright>

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using BenchmarkDotNet.Attributes;
using Microsoft.Extensions.Logging;
using OpenTelemetry.Logs;

namespace Benchmarks.Logs
{
    [MemoryDiagnoser]
    public class LogScopeBenchmarks
    {
        private readonly LoggerExternalScopeProvider scopeProvider = new();

        private readonly Action<LogRecordScope, object> callback = (LogRecordScope scope, object state) =>
        {
            foreach (KeyValuePair<string, object> scopeItem in scope)
            {
            }
        };

        private readonly LogRecord logRecord;

        public LogScopeBenchmarks()
        {
            this.scopeProvider.Push(new ReadOnlyCollection<KeyValuePair<string, object>>(
                new List<KeyValuePair<string, object>>
                {
                    new KeyValuePair<string, object>("item1", "value1"),
                    new KeyValuePair<string, object>("item2", "value2"),
                }));
            this.scopeProvider.Push(new ReadOnlyCollection<KeyValuePair<string, object>>(
                new List<KeyValuePair<string, object>>
                {
                    new KeyValuePair<string, object>("item3", "value3"),
                }));
            this.scopeProvider.Push(new ReadOnlyCollection<KeyValuePair<string, object>>(
                new List<KeyValuePair<string, object>>
                {
                    new KeyValuePair<string, object>("item4", "value4"),
                    new KeyValuePair<string, object>("item5", "value5"),
                }));

            this.logRecord = new LogRecord(
                this.scopeProvider,
                DateTime.UtcNow,
                "Benchmark",
                LogLevel.Information,
                0,
                "Message",
                null,
                null,
                null);
        }

        [Benchmark]
        public void ForEachScope()
        {
            this.logRecord.ForEachScope(this.callback, null);
        }
    }
}