package org.simantics.district.network.profile;

import org.simantics.Simantics;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.procedure.adapter.TransientCacheAsyncListener;
import org.simantics.db.exception.DatabaseException;
import org.simantics.scenegraph.INode;
import org.simantics.scenegraph.g2d.G2DSceneGraph;
import org.simantics.scenegraph.g2d.nodes.ConnectionNode;
import org.simantics.scenegraph.profile.EvaluationContext;
import org.simantics.scenegraph.profile.common.ProfileVariables;

public class EdgeThicknessStyle extends ThrottledStyleBase<Double> {

	private static final Double PENDING = Double.NaN;
	private static final Double ONE = 1.0;

	@Override
	public Double calculateThrottledStyle(ReadGraph graph, Resource runtimeDiagram, Resource entry, Resource groupItem) throws DatabaseException {
		DiagramSettings ds = graph.syncRequest(new DiagramSettingsRequest(runtimeDiagram), TransientCacheAsyncListener.instance());
		// Prevent PendingVariableExceptions from coming through
		boolean wasSynchronous = graph.setSynchronous(true);
		try {
			Double thickness = ONE;
			if (ds.edgeThicknessProperty.isPresent()) {
				thickness = Simantics.applySCLRead(graph, ds.edgeThicknessProperty.get(), groupItem);
	//			System.out.println("read thickness: " + thickness + " : " + ds.edgeThicknessProperty);
				if (thickness == null) {
					thickness = ONE;
				} else {
					thickness = thickness * ds.edgeThicknessGain + ds.edgeThicknessBias;
				}
			}
			
			return thickness;
		}
		finally {
			graph.setSynchronous(wasSynchronous);
		}
	}

	@Override
	public void applyThrottledStyleForNode(EvaluationContext observer, INode node, Double value) {
//		System.out.println("apply: " + node + " : " + value);
		ConnectionNode n = (ConnectionNode) node;
		if (value == PENDING) {
			((G2DSceneGraph)node.getRootNode()).setPending(node);
		} else {
			((G2DSceneGraph)node.getRootNode()).clearPending(node);
		}
		if (value == null)
			value = ONE;
		for (INode nn : n.getNodes())
			ProfileVariables.claimNodeProperty(nn, "stroke", value, observer);
	}

	@Override
	protected void cleanupStyleForNode(EvaluationContext evaluationContext, INode node) {
		((G2DSceneGraph)node.getRootNode()).clearPending(node);
		ConnectionNode n = (ConnectionNode) node;
		for (INode nn : n.getNodes())
			ProfileVariables.claimNodeProperty(nn, "stroke", ONE, evaluationContext);
	}

}