package eu.dnetlib.pace.tree;

import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import eu.dnetlib.pace.config.Config;
import eu.dnetlib.pace.tree.support.AbstractStringComparator;
import eu.dnetlib.pace.tree.support.ComparatorClass;

/**
 * Returns true if the year of the date field in the given documents are the same, false when any of the two is invalid or it's missing.
 *
 * @author claudio
 */
@ComparatorClass("yearMatch")
public class YearMatch extends AbstractStringComparator {

	private int limit = 4;

	public YearMatch(final Map<String, String> params) {
		super(params);
	}

	@Override
	public double compare(final String a, final String b, final Config conf) {
		final String valueA = getNumbers(getFirstValue(a));
		final String valueB = getNumbers(getFirstValue(b));

		if (valueA.isEmpty() || valueB.isEmpty())
			return -1;

		final boolean lengthMatch = checkLength(valueA) && checkLength(valueB);
		final boolean onemissing = valueA.isEmpty() || valueB.isEmpty();

		return lengthMatch && valueA.equals(valueB) || onemissing ? 1 : 0;
	}

	protected boolean checkLength(final String s) {
		return s.length() == limit;
	}

	protected String getFirstValue(final String value) {
		return (value != null) && !value.isEmpty() ? StringUtils.left(value, limit) : "";
	}

	@Override
	public String toString() {
		return getClass().getSimpleName() + ":" + super.toString();
	}
}