package PWC275;

/**
 * PL/Java implementation for PWC 275
 * Task 1
 * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-275>
 *
 *
 * 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/PWC275-1.jar  luca@rachel:/tmp


 * To install into PostgreSQL execute:

 select sqlj.install_jar( 'file:///tmp/PWC275-1.jar', 'PWC275', true );
 select sqlj.set_classpath( 'public', 'PWC275' );

 select pwc275.task2_pljava();

 and then to redeploy:

 select sqlj.replace_jar( 'file:///tmp/PWC275-1.jar', 'PWC275', 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.regex.*;
import java.util.stream.*;
import java.sql.SQLException;
import java.util.logging.*;
import java.sql.ResultSet;
import java.sql.Date;

public class Task1 {

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

    @Function( schema = "pwc275",
	       onNullInput = RETURNS_NULL,
	       effects = IMMUTABLE )
    public static final int task1_pljava( String sentence, String[] keys ) throws SQLException {
	logger.log( Level.INFO, "Entering pwc275.task1_pljava" );

	List<Pattern> patterns = Stream.of( keys )
	    .map( letter -> { return Pattern.compile( String.format( "%s", letter ), Pattern.CASE_INSENSITIVE ); } )
	    .collect( Collectors.toList() );

	return (int) Stream.of( sentence.split( "\\s+" ) )
	    .filter( word -> {
		    for ( Pattern p : patterns )
			if ( p.matcher( word ).find() )
			    return false;

		    return true;
		} ).count();

    }
}