package no.uio.ifi.refaktor.analyze.collectors;

import no.uio.ifi.refaktor.utils.CompilationUnitTextSelection;

import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.Statement;

public class LastStatementCollector extends PropertyCollector {
	private final ASTNode coveringNode;
	private Statement lastStatement;

	public LastStatementCollector(CompilationUnitTextSelection selection, ASTNode coveringNode) {
		super(selection);
		this.coveringNode = coveringNode;
	}

	@Override
	public boolean preVisit2(ASTNode node) {
		if (node == coveringNode)
			return true;
		
  		if (!nodeInSelection(node))
  			return false;
		
		if (node instanceof Statement && isPlacedAfterLastStatement(node)) {
			lastStatement = (Statement) node;
		}

		return false;
	}

	private boolean isPlacedAfterLastStatement(ASTNode node) {
		if (lastStatement == null)
			return true;
		
		int nodeEndPosition = node.getStartPosition() + node.getLength();
		int lastStatementEndPosition = lastStatement.getStartPosition() + lastStatement.getLength();
		return nodeEndPosition > lastStatementEndPosition;
	}

	public Statement getLastStatement() {
		return lastStatement;
	}

	@Override
	public void clearData() {
		lastStatement = null;
	}
}