import path from "path";

import { PolarError } from "../internal/core/errors";
import { ERRORS } from "../internal/core/errors-list";

function normalizePaths (mainPath: string, paths: string[]): string[] {
  return paths.map(n => path.relative(mainPath, n));
}

export function assertDirChildren (dir: string, scriptNames: string[]): string[] {
  const normalized = normalizePaths(".", scriptNames);
  const nonScriptPaths = normalized
    .filter(scriptName => !path.relative(".", scriptName).startsWith(dir));
  if (nonScriptPaths.length !== 0) {
    throw new PolarError(ERRORS.BUILTIN_TASKS.SCRIPTS_OUTSIDE_SCRIPTS_DIRECTORY, {
      scripts: nonScriptPaths
    });
  }
  return normalized;
}