using OpenTelemetry.Exporter;
using OpenTelemetry.Logs;
using OpenTelemetry.Metrics;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using System.Diagnostics.Metrics;

var builder = WebApplication.CreateBuilder(args);

// 1. Define Resource Information
var resourceBuilder = ResourceBuilder.CreateDefault()
    .AddService("SampleApi");

// 2. Configuration Variables 
var oltpApiKey = "mc3G63K2j5ZOEsi0AjMojLTXm1KEZFctzIIjSwDiTGut8qGSkPuWwxGP1RbscJUo";
var oltpAddress = "http://aspire-dashboard-service.aspire.svc.cluster.local:18889";

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddHealthChecks();

// 3. Configure OpenTelemetry Logging
builder.Logging.AddOpenTelemetry(logging =>
{
    logging.SetResourceBuilder(resourceBuilder);
    logging.AddOtlpExporter(opt =>
    {
        opt.Endpoint = new Uri(oltpAddress);
        opt.Protocol = OtlpExportProtocol.Grpc;
        opt.Headers = $"x-otlp-api-key={oltpApiKey}";
    });
});

// 4. Configure Tracing and Metrics (Merged into one registration)
builder.Services.AddOpenTelemetry()
    .WithTracing(tracing => tracing
        .SetResourceBuilder(resourceBuilder)
        .AddAspNetCoreInstrumentation()
        .AddHttpClientInstrumentation()
        .AddOtlpExporter(opt => 
        {
            opt.Endpoint = new Uri(oltpAddress);
            opt.Protocol = OtlpExportProtocol.Grpc;
            opt.Headers = $"x-otlp-api-key={oltpApiKey}";
        }))
    .WithMetrics(metrics => metrics
        .SetResourceBuilder(resourceBuilder)
        .AddMeter("SampleApi") // Register your custom meter here
        .AddAspNetCoreInstrumentation()
        .AddRuntimeInstrumentation()
        .AddOtlpExporter(opt => 
        {
            opt.Endpoint = new Uri(oltpAddress);
            opt.Protocol = OtlpExportProtocol.Grpc;
            opt.Headers = $"x-otlp-api-key={oltpApiKey}";
        }));

var app = builder.Build();

// 5. Initialize your Meter for use in the app
var myMeter = new Meter("SampleApi", "1.0.0");
var transactionCounter = myMeter.CreateCounter<long>("CustomCounter");

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.MapHealthChecks("/health");
app.UseRouting();
app.UseAuthorization();
app.MapControllers();

app.Run();