<?php

class EchoPageLinkedPresentationModel extends EchoEventPresentationModel {

	private $pageFrom;

	public function getIconType() {
		return 'linked';
	}

	/**
	 * The page containing the link may be a new page
	 * that is not yet replicated.
	 * This event won't be rendered unless/until
	 * both pages are available.
	 * @return bool
	 */
	public function canRender() {
		$pageTo = $this->event->getTitle();
		$pageFrom = $this->getPageFrom();
		return (bool)$pageTo && (bool)$pageFrom;
	}

	public function getPrimaryLink() {
		if ( $this->isBundled() ) {
			return false;
		} else {
			return [
				'url' => $this->getPageFrom()->getFullURL(),
				'label' => $this->msg( 'notification-link-text-view-page' )->text(),
			];
		}
	}

	public function getSecondaryLinks() {
		$whatLinksHereLink = [
			'url' => SpecialPage::getTitleFor( 'Whatlinkshere', $this->event->getTitle()->getPrefixedText() )->getFullURL(),
			'label' => $this->msg( 'notification-link-text-what-links-here' )->text(),
			'description' => '',
			'icon' => 'linked',
			'prioritized' => true
		];

		$revid = $this->event->getExtraParam( 'revid' );
		$diffLink = null;
		if ( $revid !== null ) {
			$diffLink = [
				'url' => $this->getPageFrom()->getFullURL( [ 'diff' => $revid, 'oldid' => 'prev' ] ),
				'label' => $this->msg( 'notification-link-text-view-changes', $this->getViewingUserForGender() )->text(),
				'description' => '',
				'icon' => 'changes',
				'prioritized' => true
			];
		}

		return [ $whatLinksHereLink, $diffLink ];
	}

	protected function getHeaderMessageKey() {
		if ( $this->getBundleCount( true, [ $this, 'getLinkedPageId' ] ) > 1 ) {
			return 'notification-bundle-header-page-linked';
		}
		return 'notification-header-page-linked';
	}

	public function getHeaderMessage() {
		$msg = parent::getHeaderMessage();
		$msg->params( $this->getTruncatedTitleText( $this->event->getTitle(), true ) );
		$msg->params( $this->getTruncatedTitleText( $this->getPageFrom(), true ) );
		$count =
			$this->getNotificationCountForOutput( true, [ $this, 'getLinkedPageId' ] );

		// Repeat is B/C until unused parameter is removed from translations
		$msg->numParams( $count, $count );
		return $msg;
	}

	public function getCompactHeaderMessage() {
		$msg = $this->msg( parent::getCompactHeaderMessageKey() );
		$msg->params( $this->getTruncatedTitleText( $this->getPageFrom(), true ) );
		return $msg;
	}

	/**
	 * Get the page ID of the linked-from page for a given event.
	 * @param EchoEvent $event page-linked event
	 * @return int Page ID, or 0 if the page doesn't exist
	 */
	public function getLinkedPageId( EchoEvent $event ) {
		$extra = $event->getExtra();
		if ( isset( $extra['link-from-page-id'] ) ) {
			return $extra['link-from-page-id'];
		}
		// Backwards compatibility for events from before https://gerrit.wikimedia.org/r/#/c/63076
		if ( isset( $extra['link-from-namespace'] ) && isset( $extra['link-from-title'] ) ) {
			$title = Title::makeTitleSafe( $extra['link-from-namespace'], $extra['link-from-title'] );
			if ( $title ) {
				return $title->getArticleID();
			}
		}
		return 0;
	}

	private function getPageFrom() {
		if ( !$this->pageFrom ) {
			$this->pageFrom = Title::newFromID( $this->getLinkedPageId( $this->event ) );
		}
		return $this->pageFrom;
	}

	protected function getSubjectMessageKey() {
		return 'notification-page-linked-email-subject';
	}
}