/**
 * Provider env-var lookup helpers.
 *
 * Two sources of truth feed these helpers:
 *
 *   1. LLM providers — names come from `PROVIDER_CATALOG` in
 *      `model-catalog.ts`. `getLlmProviderEnvVar` consults the catalog
 *      directly.
 *   2. Search providers — names come from `SEARCH_PROVIDER_CATALOG` in
 *      `search-provider-catalog.ts`. `getSearchProviderEnvVar` consults
 *      the catalog directly.
 *
 * Use `getLlmProviderEnvVar` when you're scoped to LLM providers,
 * `getSearchProviderEnvVar` when you're scoped to search providers, and
 * `getAnyProviderEnvVar` (LLM-first, then search) when you accept either
 * kind — e.g. the generic `getProviderKeyAsync` env-var fallback.
 *
 * Each helper returns `undefined` for keyless providers (e.g. Ollama),
 * unknown IDs, and providers outside the helper's scope.
 */
import { PROVIDER_CATALOG } from "./model-catalog.js";
import { SEARCH_PROVIDER_CATALOG } from "./search-provider-catalog.js";

/**
 * Search-provider env var names, derived from `SEARCH_PROVIDER_CATALOG`.
 * Adding a BYOK provider to the catalog automatically extends this map —
 * managed providers (no `envVar`) are filtered out.
 */
const SEARCH_PROVIDER_ENV_VAR_NAMES: Record<string, string> = Object.freeze(
  Object.fromEntries(
    SEARCH_PROVIDER_CATALOG.filter((p) => p.envVar !== undefined).map((p) => [
      p.id,
      p.envVar!,
    ]),
  ),
);

export function getLlmProviderEnvVar(providerId: string): string | undefined {
  return PROVIDER_CATALOG.find((p) => p.id === providerId)?.envVar;
}

export function getSearchProviderEnvVar(
  providerId: string,
): string | undefined {
  return SEARCH_PROVIDER_ENV_VAR_NAMES[providerId];
}

/**
 * Resolve a provider env-var name from either source — LLM catalog first,
 * then the search-provider mirror. Returns `undefined` when no provider
 * scope declares an env var for the given ID (keyless LLM providers like
 * Ollama, unknown IDs, etc.).
 */
export function getAnyProviderEnvVar(providerId: string): string | undefined {
  return (
    getLlmProviderEnvVar(providerId) ?? getSearchProviderEnvVar(providerId)
  );
}