package net.sourceforge.fenixedu.applicationTier.Servico;

import net.sourceforge.fenixedu._development.LogLevel;
import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.domain.ExecutionYear;

import org.apache.log4j.Logger;

import pt.ist.fenixWebFramework.services.Service;

public class CheckIsAliveService extends FenixService {

    private static final Logger logger = Logger.getLogger(CheckIsAliveService.class);

    private static boolean CHECK_DB = false;

    static {
	final String checkDB = PropertiesManager.getProperty("script.isAlive.check.db");
	if ("true".equalsIgnoreCase(checkDB)) {
	    CHECK_DB = true;
	}

	if (LogLevel.INFO) {
	    logger.info("CheckIsAliveService - will check db: " + CHECK_DB);
	}
    }

    @Service
    public static Boolean run() {
	try {
	    if (CHECK_DB) {
		checkFenixDatabaseOps();
	    }
	    return Boolean.TRUE;
	} catch (Throwable t) {
	    t.printStackTrace();
	    if (LogLevel.FATAL) {
		logger.fatal("Got unexepected exception in check alive service. ", t);
	    }
	    throw new RuntimeException(t);
	}
    }

    private static void checkFenixDatabaseOps() {

	final ExecutionYear executionYear = ExecutionYear.readCurrentExecutionYear();

	if (executionYear == null || executionYear.getIdInternal() == null) {
	    if (LogLevel.FATAL) {
		logger.fatal("Got a null result checking fenix database.");
	    }
	    throw new RuntimeException("Problems accesing fenix database! Got a null result.");
	}
    }

}