package PWC329;

/**
 * PL/Java implementation for PWC 329
 * Task 1
 * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-329>
 *
 *
 * To compile on the local machine:

 $ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/  # if not already set
 $ mvn clean build
 $ scp target/PWC329-1.jar  luca@rachel:/tmp


 * To install into PostgreSQL execute:

 select sqlj.install_jar( 'file:///tmp/PWC329-1.jar', 'PWC329', true );
 select sqlj.set_classpath( 'public', 'PWC329' );

 select pwc329.task2_pljava();

 and then to redeploy:

 select sqlj.replace_jar( 'file:///tmp/PWC329-1.jar', 'PWC329', true );

*/

import org.postgresql.pljava.*;
import org.postgresql.pljava.annotation.Function;
import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;

import java.util.*;
import java.util.stream.*;
import java.sql.SQLException;
import java.util.logging.*;
import java.sql.ResultSet;
import java.sql.Date;
import java.util.regex.*;

public class Task1 {

    private final static Logger logger = Logger.getAnonymousLogger();

    @Function( schema = "pwc329",
	       onNullInput = RETURNS_NULL,
	       effects = IMMUTABLE )
    public static final int[] task1_pljava( String string ) throws SQLException {
	logger.log( Level.INFO, "Entering pwc329.task1_pljava" );

	Map<Integer, Integer> numbers = new HashMap<Integer, Integer>();

	Pattern regexp = Pattern.compile( "\\d+" );
	Matcher engine = regexp.matcher( string );
	while ( engine.find() ) {
	    try {
		numbers.put( Integer.parseInt( engine.group() ), 1 );
	    } catch( Exception e ) { }
	}

	int result[] = new int[ numbers.size() ];
	int j = 0;
	for ( int i : numbers.keySet() )
	    result[ j++ ] = i;

	return result;
    }
}