<?php
/**
 * Utilities for ResourceLoader modules used by DiscussionTools.
 *
 * @file
 * @ingroup Extensions
 * @license MIT
 */

namespace MediaWiki\Extension\DiscussionTools;

use Config;
use ExtensionRegistry;
use MediaWiki\MediaWikiServices;
use MediaWiki\ResourceLoader as RL;
use MessageLocalizer;
use Title;

class ResourceLoaderData {
	/**
	 * Used for the 'ext.discussionTools.init' module and the test module.
	 *
	 * We need all of this data *in content language*. Some of it is already available in JS, but only
	 * in client language, so it's useless for us (e.g. digit transform table, month name messages).
	 *
	 * @param RL\Context $context
	 * @param Config $config
	 * @param string|null $langCode
	 * @return array
	 */
	public static function getLocalData(
		RL\Context $context, Config $config, ?string $langCode = null
	): array {
		$services = MediaWikiServices::getInstance();

		if ( $langCode === null ) {
			$langData = $services->getService( 'DiscussionTools.LanguageData' );
		} else {
			$langData = new LanguageData(
				$services->getMainConfig(),
				$services->getLanguageFactory()->getLanguage( $langCode ),
				$services->getLanguageConverterFactory(),
				$services->getSpecialPageFactory()
			);
		}

		return $langData->getLocalData();
	}

	/**
	 * Return messages in content language, for use in a ResourceLoader module.
	 *
	 * @param RL\Context $context
	 * @param Config $config
	 * @param array $messagesKeys
	 * @return array
	 */
	public static function getContentLanguageMessages(
		RL\Context $context, Config $config, array $messagesKeys = []
	): array {
		return array_combine(
			$messagesKeys,
			array_map( static function ( $key ) {
				return wfMessage( $key )->inContentLanguage()->text();
			}, $messagesKeys )
		);
	}

	/**
	 * Return information about terms-of-use messages.
	 *
	 * @param MessageLocalizer $context
	 * @param Config $config
	 * @return array Map from internal name to array of parameters for MessageLocalizer::msg()
	 */
	private static function getTermsOfUseMessages(
		MessageLocalizer $context, Config $config
	): array {
		$messages = [
			'reply' => [ 'discussiontools-replywidget-terms-click',
				$context->msg( 'discussiontools-replywidget-reply' )->text() ],
			'newtopic' => [ 'discussiontools-replywidget-terms-click',
				$context->msg( 'discussiontools-replywidget-newtopic' )->text() ],
		];

		$hookContainer = MediaWikiServices::getInstance()->getHookContainer();
		$hookContainer->run( 'DiscussionToolsTermsOfUseMessages', [ &$messages, $context, $config ] );

		return $messages;
	}

	/**
	 * Return parsed terms-of-use messages, for use in a ResourceLoader module.
	 *
	 * @param MessageLocalizer $context
	 * @param Config $config
	 * @return array
	 */
	public static function getTermsOfUseMessagesParsed(
		MessageLocalizer $context, Config $config
	): array {
		$messages = static::getTermsOfUseMessages( $context, $config );
		foreach ( $messages as &$msg ) {
			$msg = $context->msg( ...$msg )->parse();
		}
		return $messages;
	}

	/**
	 * Return information about terms-of-use messages, for use in a ResourceLoader module as
	 * 'versionCallback'. This is to avoid calling the parser from version invalidation code.
	 *
	 * @param MessageLocalizer $context
	 * @param Config $config
	 * @return array
	 */
	public static function getTermsOfUseMessagesVersion(
		MessageLocalizer $context, Config $config
	): array {
		$messages = static::getTermsOfUseMessages( $context, $config );
		foreach ( $messages as &$msg ) {
			$message = $context->msg( ...$msg );
			$msg = [
				// Include the text of the message, in case the canonical translation changes
				$message->plain(),
				// Include the page touched time, in case the on-wiki override is invalidated
				Title::makeTitle( NS_MEDIAWIKI, ucfirst( $message->getKey() ) )->getTouched(),
			];
		}
		return $messages;
	}

	/**
	 * Add optional dependencies to a ResourceLoader module definition depending on loaded extensions.
	 *
	 * @param array $info
	 * @return RL\Module
	 */
	public static function addOptionalDependencies( array $info ): RL\Module {
		$extensionRegistry = ExtensionRegistry::getInstance();

		foreach ( $info['optionalDependencies'] as $ext => $deps ) {
			if ( $extensionRegistry->isLoaded( $ext ) ) {
				$info['dependencies'] = array_merge( $info['dependencies'], (array)$deps );
			}
		}

		$class = $info['class'] ?? RL\FileModule::class;
		return new $class( $info );
	}
}