package PWC347;

/**
 * PL/Java implementation for PWC 347
 * Task 1
 * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-347>
 *
 *
 * 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/PWC347-1.jar  luca@rachel:/tmp


 * To install into PostgreSQL execute:

 select sqlj.install_jar( 'file:///tmp/PWC347-1.jar', 'PWC347', true );
 select sqlj.set_classpath( 'public', 'PWC347' );

 select pwc347.task2_pljava();

 and then to redeploy:

 select sqlj.replace_jar( 'file:///tmp/PWC347-1.jar', 'PWC347', 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;

public class Task1 {

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

    @Function( schema = "pwc347",
	       onNullInput = RETURNS_NULL,
	       effects = IMMUTABLE )
    public static final String task1_pljava( String date ) throws SQLException {
	logger.log( Level.INFO, "Entering pwc347.task1_pljava" );

	Map<String, Integer> months = new HashMap<String, Integer>();

	months.put( "Jan", 1 );
	months.put( "Feb", 2 );
	months.put( "Mar", 3 );
	months.put( "Apr", 4 );
	months.put( "May", 5 );
	months.put( "Jun", 6 );
	months.put( "Jul", 7 );
	months.put( "Aug", 8 );
	months.put( "Sep", 9 );
	months.put( "Oct", 10 );
	months.put( "Nov", 11 );
	months.put( "Dec", 12 );

	
	String[] parts = date.split( "\\s+" );
	return String.format( "%04d-%02d-%02d",
			      Integer.parseInt( parts[ 2 ] ),
			      months.get( parts[ 1 ] ),
			      Integer.parseInt( parts[ 0 ].replace( "st", "" ).replace( "nd", "" ).replace( "rd", "" ).replace( "rh", "" ) ) );
    }
}