import yaml from 'js-yaml';
import { CompassYaml } from '../../../types';
import { INVALID_YAML_ERROR } from './validate-config-file/models/error-messages';
import { InvalidConfigFileError } from './validate-config-file/models/errors';

/**
 * Transforms string configFile into Compass Yaml data structure.
 * @throws InvalidConfigFileError If unable to parse the structure
 * @param configFile
 * @returns CompassYaml, If successfully loaded the contents else null
 */
export const loadConfigFile = (configFile: string): CompassYaml | null => {
  let componentYaml: CompassYaml | null = null;
  try {
    componentYaml = yaml.load(configFile) as CompassYaml;
  } catch (e) {
    console.warn({ message: 'Error parsing yaml file', error: e });
    throw new InvalidConfigFileError([INVALID_YAML_ERROR]);
  }

  if (!componentYaml) {
    console.warn({ message: 'Unable to load config file into componentYaml.' });
    throw new InvalidConfigFileError([INVALID_YAML_ERROR]);
  }
  return componentYaml;
};