import { useCaseNameFromFile } from "./_usecase-name.js";
import { featureRootForFile } from "./_manifest-source.js";

/**
 * Resolves the rule execution context from an ESLint context object.
 * Returns null when the file is not a use-case file or not inside a
 * recognised feature package — callers should return {} immediately.
 */
export function resolveRuleContext(context) {
  const opts = context.options[0] ?? {};
  const repoRoot = opts.repoRoot ?? context.cwd ?? process.cwd();
  const filename = context.filename;
  const useCaseName = useCaseNameFromFile(filename);
  if (!useCaseName) return null;
  const featureRoot = featureRootForFile(filename, repoRoot);
  if (!featureRoot) return null;
  return { useCaseName, featureRoot, repoRoot };
}