<?php

use MediaWiki\MediaWikiServices;

/**
 * A class for querying translated currency names from CLDR data.
 *
 * @author Niklas Laxström
 * @author Ryan Kaldari
 * @copyright Copyright © 2007-2012
 * @license GPL-2.0-or-later
 */
class CurrencyNames extends CldrNames {

	private static $cache = [];

	/**
	 * Get localized currency names for a particular language, using fallback languages for missing
	 * items.
	 *
	 * @param string $code The language to return the list in
	 * @return array an associative array of currency codes and localized currency names
	 */
	public static function getNames( $code ) {
		// Load currency names localized for the requested language
		$names = self::loadLanguage( $code );

		// Load missing currency names from fallback languages
		$fallbacks = MediaWikiServices::getInstance()->getLanguageFallback()->getAll( $code );
		foreach ( $fallbacks as $fallback ) {
			// Overwrite the things in fallback with what we have already
			$names = array_merge( self::loadLanguage( $fallback ), $names );
		}

		return $names;
	}

	/**
	 * Load currency names localized for a particular language. Helper function for getNames.
	 *
	 * @param string $code The language to return the list in
	 * @return array an associative array of currency codes and localized currency names
	 */
	private static function loadLanguage( $code ) {
		if ( !isset( self::$cache[$code] ) ) {

			$langNameUtils = MediaWikiServices::getInstance()->getLanguageNameUtils();

			/* Load override for wrong or missing entries in cldr */
			$override = __DIR__ . '/../LocalNames/' . self::getOverrideFileName( $code );
			if ( $langNameUtils->isValidBuiltInCode( $code ) && file_exists( $override ) ) {
				$currencyNames = false;
				require $override;
				// @phan-suppress-next-line PhanImpossibleCondition
				if ( is_array( $currencyNames ) ) {
					self::$cache[$code] = $currencyNames;
				}
			}

			$filename = __DIR__ . '/../CldrNames/' . self::getFileName( $code );
			if ( $langNameUtils->isValidBuiltInCode( $code ) && file_exists( $filename ) ) {
				$currencyNames = false;
				require $filename;
				// @phan-suppress-next-line PhanImpossibleCondition
				if ( is_array( $currencyNames ) ) {
					if ( isset( self::$cache[$code] ) ) {
						// Add to existing list of localized currency names
						self::$cache[$code] += $currencyNames;
					} else {
						// No list exists, so create it
						self::$cache[$code] = $currencyNames;
					}
				}
			} else {
				wfDebug( __METHOD__ . ": Unable to load currency names for $filename\n" );
			}
		}

		return self::$cache[$code] ?? [];
	}
}
