package org.simantics.document.linking.report.templates;

import java.util.Comparator;
import java.util.List;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.utils.NameUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.document.linking.utils.SourceLinkUtil;
import org.simantics.layer0.Layer0;
import org.simantics.utils.strings.AlphanumComparator;


class ResourceNameComparator implements Comparator<Resource> {
	protected ReadGraph graph;
	protected Layer0 l0;
	protected Resource model;
	
	public ResourceNameComparator(ReadGraph graph, Resource model) {
		this.graph = graph;
		this.l0 = Layer0.getInstance(graph);
		this.model = model;
	}
	
	@Override
	public int compare(Resource r1, Resource r2) {
		if (r1.equals(r2))
			return 0;
		try {
			String l1 = getText(r1);
			String l2 = getText(r2);
			int c = AlphanumComparator.COMPARATOR.compare(l1, l2);
			if (c == 0) {
				if (r1.getResourceId() > r2.getResourceId())
					return 1;
				if (r1.getResourceId() < r2.getResourceId())
					return -1;
				return 0;
			}
			return c;
		} catch (DatabaseException e) {
			return 0;
		}
		
	}
	
	public String getText(Resource r) throws DatabaseException {
		String l1 = NameUtils.getSafeLabel(graph, r);
		if (l1.length() == 0)
			l1 = NameUtils.getSafeName(graph, r);
		return l1;
	}
	
	public List<Resource> getPath(Resource obj) throws DatabaseException {
		return SourceLinkUtil.getPath(graph, model, obj);
	}
}