import * as yaml from "yaml";
import { extname } from "./extname.js";

export const loadFileContents = (contents: string, format: string) => {
  switch (format) {
    case ".json":
      return JSON.parse(contents);
    case ".yml":
    case ".yaml":
      return yaml.parse(contents);
    default:
      throw new Error(`Unsupported filetype ${format}`);
  }
};

export const parseFileConfig = (
  text: string,
  path: string,
  supportedTypes?: string[]
) => {
  const suffix = extname(path);

  if (
    ![".json", ".yaml"].includes(suffix) ||
    (supportedTypes && !supportedTypes.includes(suffix))
  ) {
    throw new Error(`Unsupported filetype ${suffix}`);
  }

  return loadFileContents(text, suffix);
};