const { NodeSDK } = require('@opentelemetry/sdk-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');
const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-http');
const { OTLPMetricExporter } = require('@opentelemetry/exporter-metrics-otlp-http');
const { PeriodicExportingMetricReader } = require('@opentelemetry/sdk-metrics');

const endpoint = process.env.OTEL_EXPORTER_OTLP_ENDPOINT || 'http://localhost:4318';

const sdk = new NodeSDK({
  traceExporter: new OTLPTraceExporter({
    url: endpoint + '/v1/traces',
  }),
  metricReader: new PeriodicExportingMetricReader({
    exporter: new OTLPMetricExporter({
      url: endpoint + '/v1/metrics',
    }),
    exportIntervalMillis: 30000,
  }),
  instrumentations: [getNodeAutoInstrumentations()],
  serviceName: process.env.OTEL_SERVICE_NAME || 'nodejs-app',
});

sdk.start();
process.on('SIGTERM', () => sdk.shutdown());
console.log('[OPHION] OpenTelemetry auto-instrumentation enabled');