import {
  awsBeanstalkDetector,
  awsEc2Detector,
  awsEcsDetector,
  awsEksDetector,
  awsLambdaDetector,
} from '@opentelemetry/resource-detector-aws';
import {
  azureAppServiceDetector,
  azureFunctionsDetector,
  azureVmDetector,
} from '@opentelemetry/resource-detector-azure';
import { gcpDetector } from '@opentelemetry/resource-detector-gcp';
import { gitHubDetector } from '@opentelemetry/resource-detector-github';
import type { ResourceDetector } from '@opentelemetry/resources';
import { envDetector } from '@opentelemetry/resources';

export function getResourceDetectors(
  env: NodeJS.ProcessEnv,
): ResourceDetector[] {
  const detectors: Record<string, ResourceDetector | ResourceDetector[]> = {
    aws: [
      awsBeanstalkDetector,
      awsEc2Detector,
      awsEcsDetector,
      awsEksDetector,
      awsLambdaDetector,
    ],
    azure: [azureAppServiceDetector, azureFunctionsDetector, azureVmDetector],
    gcp: gcpDetector,
    github: gitHubDetector,
    env: envDetector,
  };

  const resourceDetectorsFromEnv = new Set(
    env.OTEL_NODE_RESOURCE_DETECTORS?.split(',') ?? [
      env.RENOVATE_USE_CLOUD_METADATA_SERVICES?.toLocaleLowerCase() === 'false'
        ? 'env'
        : 'all',
    ],
  );

  if (resourceDetectorsFromEnv.has('none')) {
    return [];
  }

  if (resourceDetectorsFromEnv.has('all')) {
    return Object.values(detectors).flat();
  }

  return Object.entries(detectors)
    .filter(([name]) => resourceDetectorsFromEnv.has(name))
    .map(([_, value]) => value)
    .flat();
}