import { dirname as pathDirname, join as pathJoin, sep as pathSep } from 'path';
import { getNearestPackageJsonDirPath } from './getThisCodebaseRootDirPath';

let cache: string | undefined = undefined;

/** NOTE: Careful, this function can fail when the binary
 *  Used is not in the node_modules directory of the project
 * (for example when running tests with vscode extension we'll get
 * '/Users/dylan/.vscode/extensions/vitest.explorer-1.16.0/dist/worker.js'
 *
 * instead of
 * '/Users/joseph/.nvm/versions/node/v22.12.0/bin/node'
 * or
 * '/Users/joseph/github/keycloakify-starter/node_modules/.bin/vite'
 *
 * as the value of process.argv[1]
 */
export function getNodeModulesBinDirPath() {
  if (cache !== undefined) {
    return cache;
  }

  const binPath = process.argv[1];

  special_case_running_not_from_distribution: {
    if (!binPath.endsWith('.ts')) {
      break special_case_running_not_from_distribution;
    }

    const packageJsonDirPath = getNearestPackageJsonDirPath(pathDirname(binPath));

    const nodeModulesBinDirPath = pathJoin(packageJsonDirPath, 'node_modules', '.bin');

    return nodeModulesBinDirPath;
  }

  const segments: string[] = ['.bin'];

  let foundNodeModules = false;

  for (const segment of binPath.split(pathSep).reverse()) {
    skip_segment: {
      if (foundNodeModules) {
        break skip_segment;
      }

      if (segment === 'node_modules') {
        foundNodeModules = true;
        break skip_segment;
      }

      continue;
    }

    segments.unshift(segment);
  }

  if (!foundNodeModules) {
    throw new Error(`Could not find node_modules in path ${binPath}`);
  }

  const nodeModulesBinDirPath = segments.join(pathSep);

  cache = nodeModulesBinDirPath;

  return nodeModulesBinDirPath;
}