import { SUPPORTED_LANGUAGES } from '@atlaskit/code/constants';

// We expect alias[0] to be used for the ADF attribute, see ED-2813
export const DEFAULT_LANGUAGES = [
  { name: '(None)', alias: ['none'], value: 'none' },
  ...SUPPORTED_LANGUAGES,
];

export type Language = typeof DEFAULT_LANGUAGES[number];

export function findMatchedLanguage(
  supportedLanguages: Language[],
  language?: string,
) {
  if (!language) {
    return undefined;
  }

  const matches = supportedLanguages.filter((supportedLanguage) => {
    return (
      supportedLanguage.alias.indexOf(language.toLowerCase() as never) !== -1
    );
  });

  if (matches.length > 0) {
    return matches[0];
  }

  return undefined;
}

export function filterSupportedLanguages(
  supportedLanguages: Array<string>,
): Language[] {
  if (!supportedLanguages || !supportedLanguages.length) {
    return DEFAULT_LANGUAGES;
  }

  return DEFAULT_LANGUAGES.filter((language) => {
    let i = language.alias.length;
    while (i--) {
      if (supportedLanguages.indexOf(language.alias[i]) > -1) {
        return true;
      }
    }
    return false;
  });
}

export function getLanguageIdentifier(language: Language): string {
  return language.alias[0];
}

export function createLanguageList(supportedLanguages: Language[]) {
  return supportedLanguages.sort((left, right) => {
    if (left.alias[0] === 'none') {
      return -1;
    }
    if (left.name.toLowerCase() > right.name.toLowerCase()) {
      return 1;
    }
    if (left.name.toLowerCase() < right.name.toLowerCase()) {
      return -1;
    }
    return 0;
  });
}