// OpenTelemetry auto-instrumentation. Imported FIRST in server.js.
const process = require("process");

try {
  const { NodeSDK } = require("@opentelemetry/sdk-node");
  const {
    getNodeAutoInstrumentations,
  } = require("@opentelemetry/auto-instrumentations-node");
  const {
    OTLPTraceExporter,
  } = require("@opentelemetry/exporter-trace-otlp-http");

  const endpointBase =
    process.env.SIGNOZ_OTEL_ENDPOINT || "http://100.64.0.10:4318";
  const tracesEndpoint = `${endpointBase.replace(/\/$/, "")}/v1/traces`;

  const sdk = new NodeSDK({
    serviceName: "skribbl-gartic-color",
    traceExporter: new OTLPTraceExporter({ url: tracesEndpoint }),
    instrumentations: [
      getNodeAutoInstrumentations({
        "@opentelemetry/instrumentation-fs": { enabled: false },
      }),
    ],
  });

  try {
    sdk.start();
    console.log(
      `[otel] tracing initialised (endpoint=${tracesEndpoint}, service=skribbl-gartic-color)`
    );
  } catch (err) {
    console.warn("[otel] sdk.start failed (continuing without tracing):", err?.message || err);
  }

  process.on("SIGTERM", () => {
    sdk.shutdown().catch(() => {}).finally(() => process.exit(0));
  });
} catch (err) {
  console.warn(
    "[otel] tracing dependencies not available, continuing without telemetry:",
    err?.message || err
  );
}