<?php
/*
 * This file is part of the MediaWiki extension Popups.
 *
 * Popups is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * Popups is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Popups.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @file
 * @ingroup extensions
 */
namespace Popups;

use MediaWiki\MediaWikiServices;
use User;
use OutputPage;
use Skin;

/**
 * Hooks definitions for Popups extension
 *
 * @package Popups
 */
class PopupsHooks {
	const PREVIEWS_PREFERENCES_SECTION = 'rendering/reading';

	/**
	 * Hook executed on retrieving User beta preferences
	 * @param User $user User whose beta preferences are retrieved
	 * @param array &$prefs An associative array of all beta preferences
	 */
	static function onGetBetaPreferences( User $user, array &$prefs ) {
		global $wgExtensionAssetsPath;
		/** @var PopupsContext $context */
		$context = MediaWikiServices::getInstance()->getService( 'Popups.Context' );
		if ( $context->isBetaFeatureEnabled() !== true ) {
			return;
		}
		$prefs[PopupsContext::PREVIEWS_BETA_PREFERENCE_NAME] = [
			'label-message' => 'popups-message',
			'desc-message' => 'popups-desc',
			'screenshot' => [
				'ltr' => "$wgExtensionAssetsPath/Popups/images/popups-ltr.svg",
				'rtl' => "$wgExtensionAssetsPath/Popups/images/popups-rtl.svg",
			],
			'info-link' => 'https://www.mediawiki.org/wiki/Special:MyLanguage/Beta_Features/Hovercards',
			'discussion-link' => 'https://www.mediawiki.org/wiki/Talk:Beta_Features/Hovercards',
			'requirements' => [
				'javascript' => true,
			],
		];
	}

	/**
	 * Add Page Previews options to user Preferences page
	 *
	 * @param User $user User whose preferences are being modified
	 * @param array &$prefs Preferences description array, to be fed to a HTMLForm object
	 */
	static function onGetPreferences( User $user, array &$prefs ) {
		$context = MediaWikiServices::getInstance()->getService( 'Popups.Context' );

		if ( !$context->showPreviewsOptInOnPreferencesPage() ) {
			return;
		}
		$option = [
			'type' => 'radio',
			'label-message' => 'popups-prefs-optin-title',
			'help-message' => 'popups-prefs-conflicting-gadgets-info',
			'options' => [
				wfMessage( 'popups-prefs-optin-enabled-label' )->text()
				=> PopupsContext::PREVIEWS_ENABLED,
				wfMessage( 'popups-prefs-optin-disabled-label' )->text()
				=> PopupsContext::PREVIEWS_DISABLED
			],
			'section' => self::PREVIEWS_PREFERENCES_SECTION
		];
		if ( $context->conflictsWithNavPopupsGadget( $user ) ) {
			$option[ 'disabled' ] = true;
			$option[ 'help-message' ] = [ 'popups-prefs-disable-nav-gadgets-info',
				'Special:Preferences#mw-prefsection-gadgets' ];
		}

		$skinPosition = array_search( 'skin', array_keys( $prefs ) );

		if ( $skinPosition !== false ) {
			$injectIntoIndex = $skinPosition + 1;
			$prefs = array_slice( $prefs, 0, $injectIntoIndex, true )
				+ [ PopupsContext::PREVIEWS_OPTIN_PREFERENCE_NAME => $option ]
				+ array_slice( $prefs, $injectIntoIndex, count( $prefs ) - 1, true );
		} else {
			$prefs[ PopupsContext::PREVIEWS_OPTIN_PREFERENCE_NAME ] = $option;
		}
	}

	/**
	 * Allows last minute changes to the output page, e.g. adding of CSS or JavaScript by extensions.
	 *
	 * @param OutputPage &$out The Output page object
	 * @param Skin &$skin &Skin object that will be used to generate the page
	 */
	public static function onBeforePageDisplay( OutputPage &$out, Skin &$skin ) {
		$context = MediaWikiServices::getInstance()->getService( 'Popups.Context' );
		if ( $context->isTitleBlacklisted( $out->getTitle() ) ) {
			return;
		}

		if ( !$context->areDependenciesMet() ) {
			$logger = $context->getLogger();
			$logger->error( 'Popups requires the PageImages and TextExtracts extensions. '
				. 'If Beta mode is on it requires also BetaFeatures extension' );
			return;
		}

		$user = $out->getUser();
		if ( !$context->isBetaFeatureEnabled() || $context->shouldSendModuleToUser( $user ) ) {
			$out->addModules( [ 'ext.popups' ] );
		}
	}

	/**
	 * @param array &$vars Array of variables to be added into the output of the startup module
	 */
	public static function onResourceLoaderGetConfigVars( array &$vars ) {
		$conf = MediaWikiServices::getInstance()->getService( 'Popups.Config' );
		$vars['wgPopupsBetaFeature'] = $conf->get( 'PopupsBetaFeature' );
		$vars['wgPopupsVirtualPageViews'] = $conf->get( 'PopupsVirtualPageViews' );
		$vars['wgPopupsGateway'] = $conf->get( 'PopupsGateway' );
		$vars['wgPopupsEventLogging'] = $conf->get( 'PopupsEventLogging' );
		$vars['wgPopupsAnonsExperimentalGroupSize'] = $conf->get( 'PopupsAnonsExperimentalGroupSize' );
		$vars['wgPopupsStatsvSamplingRate'] = $conf->get( 'PopupsStatsvSamplingRate' );
	}

	/**
	 * MakeGlobalVariablesScript hook handler.
	 *
	 * Variables added:
	 * * `wgPopupsShouldSendModuleToUser' - The server's notion of whether or not the
	 *   user has enabled Page Previews (see `\Popups\PopupsContext#shouldSendModuleToUser`).
	 * * `wgPopupsConflictsWithNavPopupGadget' - The server's notion of whether or not the
	 *   user has enabled conflicting Navigational Popups Gadget.
	 *
	 * @param array &$vars variables to be added into the output of OutputPage::headElement
	 * @param OutputPage $out OutputPage instance calling the hook
	 */
	public static function onMakeGlobalVariablesScript( array &$vars, OutputPage $out ) {
		$context = MediaWikiServices::getInstance()->getService( 'Popups.Context' );
		$user = $out->getUser();

		$vars['wgPopupsShouldSendModuleToUser'] = $context->shouldSendModuleToUser( $user );
		$vars['wgPopupsConflictsWithNavPopupGadget'] = $context->conflictsWithNavPopupsGadget(
			$user );
	}

	/**
	 * Register default preferences for popups
	 *
	 * @param array &$wgDefaultUserOptions Reference to default options array
	 */
	public static function onUserGetDefaultOptions( &$wgDefaultUserOptions ) {
		$context = MediaWikiServices::getInstance()->getService( 'Popups.Context' );
		$wgDefaultUserOptions[ PopupsContext::PREVIEWS_OPTIN_PREFERENCE_NAME ] =
			$context->getDefaultIsEnabledState();
	}

}