const { NodeSDK } = require('@opentelemetry/sdk-node');
const { ConsoleSpanExporter } = require('@opentelemetry/sdk-trace-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');
const { Resource } = require('@opentelemetry/resources');
const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');

let sdk = null;

function initTracing(config) {
    if (config.otelTracesEnabled !== true) {
        return;
    }

    const exporter = new ConsoleSpanExporter();

    sdk = new NodeSDK({
        resource: new Resource({
            [SemanticResourceAttributes.SERVICE_NAME]: 'hyb-oa-server',
        }),
        traceExporter: exporter,
        instrumentations: [getNodeAutoInstrumentations({
            '@opentelemetry/instrumentation-fs': { enabled: false },
        })]
    });

    try {
        sdk.start();
        console.log('OTel tracing initialized');
    } catch (error) {
        console.error('Error initializing OTel tracing', error);
    }

    process.on('SIGTERM', () => {
        if (sdk) {
            sdk.shutdown()
                .then(() => console.log('OTel tracing terminated'))
                .catch((error) => console.log('Error terminating OTel tracing', error));
        }
    });
}

module.exports = { initTracing };