// <copyright file="Instrumentation.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>

namespace Examples.AspNetCore;

using System.Diagnostics;
using System.Diagnostics.Metrics;

/// <summary>
/// It is recommended to use a custom type to hold references for
/// ActivitySource and Instruments. This avoids possible type collisions
/// with other components in the DI container.
/// </summary>
public class Instrumentation : IDisposable
{
    internal const string ActivitySourceName = "Examples.AspNetCore";
    internal const string MeterName = "Examples.AspNetCore";
    private readonly Meter meter;

    public Instrumentation()
    {
        string? version = typeof(Instrumentation).Assembly.GetName().Version?.ToString();
        this.ActivitySource = new ActivitySource(ActivitySourceName, version);
        this.meter = new Meter(MeterName, version);
        this.FreezingDaysCounter = this.meter.CreateCounter<long>("weather.days.freezing", "The number of days where the temperature is below freezing");
    }

    public ActivitySource ActivitySource { get; }

    public Counter<long> FreezingDaysCounter { get; }

    public void Dispose()
    {
        this.ActivitySource.Dispose();
        this.meter.Dispose();
    }
}
