// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

using System.Diagnostics;
using System.Net.Http;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Logging;
using OpenTelemetry;
using OpenTelemetry.Metrics;
using Azure.Monitor.OpenTelemetry.Exporter;
using System;
using System.Threading;

public class Program
{
    internal class M : BaseExporter<Metric>
    {
        public override ExportResult Export(in Batch<Metric> batch)
        {
            foreach (var metric in batch)
            {
                if (metric.Name == "dotnet.thread_pool.queue.length" || metric.Name == "dotnet.thread_pool.thread.count")
                {
                    if (metric.MetricType != MetricType.LongSumNonMonotonic)
                    {
                        Console.WriteLine("Detected {0} metric was of incorrect type: {1}", metric.Name, metric.MetricType);
                    }
                }
            }
            return ExportResult.Success;
        }
    }

    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);

        var meterProvider = Sdk
            .CreateMeterProviderBuilder()
            .AddReader(new PeriodicExportingMetricReader(new M(), 2000))
            .AddRuntimeInstrumentation()
            .Build();

        var app = builder.Build();

        app.MapGet("/", () =>
        {
            app.Logger.LogInformation("Hello World!");

            using var client = new HttpClient();
            var response = client.GetAsync("https://www.bing.com/").Result;

            return $"Hello World! OpenTelemetry Trace: {Activity.Current?.Id}";
        });

        app.Run();
    }
}