// Builds the regulation-mapping runtime from the environment: the real
// retrieval service when configured, otherwise a static disabled/misconfigured
// stub. Kept separate from regulation-mapping.ts to avoid an import cycle with
// the service module.

import {
  disabledRegulationMapping,
  readRegulationMappingConfig,
  RegulationMappingUnavailableError,
  type RegulationMapping,
  type RegulationMappingEnvironment
} from './regulation-mapping';
import { RegulationRetrievalService } from './regulation-retrieval-service';

class MisconfiguredRegulationMapping implements RegulationMapping {
  constructor(private readonly detailCode: string) {}
  private report() {
    return { capability: 'misconfigured' as const, detailCode: this.detailCode };
  }
  cachedCapability() {
    return this.report();
  }
  async refreshCapability() {
    return this.report();
  }
  async retrieve(): Promise<never> {
    throw new RegulationMappingUnavailableError(this.report());
  }
}

export function createRegulationMapping(env: RegulationMappingEnvironment = process.env as RegulationMappingEnvironment): RegulationMapping {
  const result = readRegulationMappingConfig(env);
  if (result.state === 'disabled') return disabledRegulationMapping();
  if (result.state === 'error') return new MisconfiguredRegulationMapping(result.detailCode);
  return new RegulationRetrievalService(result.config);
}