1 files changed, 122 insertions, 0 deletions
diff --git a/www/wiki/extensions/ModernTimeline/src/JsonBuilder.php b/www/wiki/extensions/ModernTimeline/src/JsonBuilder.php
new file mode 100644
index 00000000..2f727df1
--- /dev/null
+++ b/www/wiki/extensions/ModernTimeline/src/JsonBuilder.php
@@ -0,0 +1,122 @@
+<?php
+
+declare( strict_types = 1 );
+
+namespace ModernTimeline;
+
+use ModernTimeline\ResultFacade\PropertyValueCollection;
+use ModernTimeline\ResultFacade\Subject;
+use ModernTimeline\ResultFacade\SubjectCollection;
+use ModernTimeline\SlidePresenter\SlidePresenter;
+use SMWDITime;
+
+class JsonBuilder {
+
+	private $slidePresenter;
+
+	public function __construct( SlidePresenter $slidePresenter ) {
+		$this->slidePresenter = $slidePresenter;
+	}
+
+	public function buildTimelineJson( SubjectCollection $pages ): array {
+		$events = [];
+
+		foreach ( $pages->getSubjects() as $subject ) {
+			[ $startDate, $endDate ] = $this->getDates( $subject );
+
+			if ( $startDate !== null ) {
+				$events[] = new Event( $subject, $startDate, $endDate );
+			}
+		}
+
+		return $this->eventsToTimelineJson( $events );
+	}
+
+	private function getDates( Subject $subject ): array {
+		$startDate = null;
+		$endDate = null;
+
+		foreach ( $this->getPropertyValueCollectionsWithDates( $subject ) as $propertyValues ) {
+			$dataItem = $propertyValues->getDataItems()[0];
+
+			if ( $dataItem instanceof SMWDITime ) {
+				if ( $startDate === null ) {
+					$startDate = $dataItem;
+				}
+				else if ( $endDate === null ) {
+					$endDate = $dataItem;
+				}
+				else {
+					break;
+				}
+			}
+		}
+
+		return [ $startDate, $endDate ];
+	}
+
+	/**
+	 * @param Event[] $events
+	 * @return array
+	 */
+	public function eventsToTimelineJson( array $events ): array {
+		$jsonEvents = [];
+
+		foreach ( $events as $event ) {
+			$jsonEvents[] = $this->buildEvent( $event );
+		}
+
+		return [ 'events' => $jsonEvents ];
+	}
+
+	private function buildEvent( Event $event ): array {
+		$jsonEvent = [
+			'text' => [
+				'headline' => $this->newHeadline( $event->getSubject()->getWikiPage()->getTitle() ),
+				'text' =>  $this->slidePresenter->getText( $event->getSubject() )
+			],
+			'start_date' => $this->timeToJson( $event->getStartDate() )
+		];
+
+		if ( $event->getEndDate() !== null ) {
+			$jsonEvent['end_date'] = $this->timeToJson( $event->getEndDate() );
+		}
+
+		return $jsonEvent;
+	}
+
+	/**
+	 * @return PropertyValueCollection[]
+	 */
+	private function getPropertyValueCollectionsWithDates( Subject $subject ) {
+		return array_filter(
+			$subject->getPropertyValueCollections(),
+			function( PropertyValueCollection $pvc ) {
+				return $pvc->getPrintRequest()->getTypeID() === '_dat'
+					&& $pvc->getDataItems() !== [];
+			}
+		);
+	}
+
+	private function newHeadline( \Title $title ): string {
+		return \Html::element(
+			'a',
+			[ 'href' => $title->getFullURL() ],
+			$title->getText()
+		);
+
+//		return DataValueFactory::getInstance()->newDataValueByItem( $subject->getWikiPage() )->getLongHTMLText( smwfGetLinker() );
+	}
+
+	private function timeToJson( SMWDITime $time ): array {
+		return [
+			'year' => $time->getYear(),
+			'month' => $time->getMonth(),
+			'day' => $time->getDay(),
+			'hour' => $time->getHour(),
+			'minute' => $time->getMinute(),
+			'second' => (int)$time->getSecond(),
+		];
+	}
+
+}