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/**
* TODO: rdar://73010072 (Make localization utils its own package)
* Copied from:
* https://github.pie.apple.com/amp-ui/desktop-music-app/blob/main/app/utils/page-dir.js
*/
// these overrides were determined to always show page in RTL, even if the global elements dont contain
// an he_il entry
// <rdar://problem/49297213> LOC: IW-IL: RTL: Web Preview Pages: The Preview Pages are not RTL.
const RTL_LANG_CODES_OVERRIDE = [
'he', // hebrew
];
const RTL_LANG_CODES = [
'ar', // arabic
'he', // hebrew
'ku', // kurdish
'ur', // urdu
'ps', // pashto
'yi', // yiddish
];
/**
* Determine the page-direction for a given locale
*
* @param {String} localeCode - A string containing a language code and region code separated by a hyphen.
* @param {String|undefined|null} langParam - A language code passed from the `l=` query param.
*/
export function getPageDir(
localeCode: string,
langParam: string | undefined | null = null,
) {
const twoLettersLangCode = localeCode.split('-')[0];
const isRTLLang = RTL_LANG_CODES.includes(twoLettersLangCode);
const isRTLLangOverride =
typeof langParam === 'string' &&
RTL_LANG_CODES_OVERRIDE.includes(langParam);
return isRTLLang || isRTLLangOverride ? 'rtl' : 'ltr';
}
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