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package org.netbeans.modules.analysis.ui;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import org.openide.nodes.Node;

/**
 *
 * @author lahvac
 */
public class PreviousError extends AbstractErrorAction {

    public PreviousError(AnalysisResultTopComponent comp) {
        super(comp);
    }
        
    @Override
    protected Node findSubsequentNode(Node from) {
        Node parent = from.getParentNode();

        while (parent != null) {
            List<Node> children = Arrays.asList(parent.getChildren().getNodes(true));
            int index = children.indexOf(from);

            for (int i = index - 1; i >= 0; i--) {
                Node c = children.get(i);

                if (isUseful(c)) return c;

                Node result = findLastUsableChild(c);

                if (result != null) return result;
            }

            from = parent;
            parent = parent.getParentNode();
        }

        return null;
    }

    private Node findLastUsableChild(Node parent) {
        List<Node> deeper = new LinkedList<>();

        deeper.add(parent);

        while (!deeper.isEmpty()) {
            Node top = deeper.remove(deeper.size() - 1);

            if (isUseful(top)) return top;

            deeper.addAll(Arrays.asList(top.getChildren().getNodes(true)));
        }

        return null;
    }
}
