<?php

namespace MediaWiki\Extension\CLDR;

use MediaWiki\MediaWikiServices;

/**
 * A class for querying translated country names from CLDR data.
 *
 * @author Niklas Laxström
 * @author Ryan Kaldari
 * @copyright Copyright © 2007-2011
 * @license GPL-2.0-or-later
 */
class CountryNames {

	/** @var array */
	private static $cache = [];

	/**
	 * Get localized country 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 country codes and localized country names
	 */
	public static function getNames( $code ) {
		// Load country names localized for the requested language
		$names = self::loadLanguage( $code );

		// Load missing country 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 country 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 country codes and localized country names
	 */
	private static function loadLanguage( $code ) {
		if ( !isset( self::$cache[$code] ) ) {

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

			if ( !$langNameUtils->isValidBuiltInCode( $code ) ) {
				return [];
			}

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

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

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

class_alias( CountryNames::class, 'CountryNames' );