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import org.joget.apps.app.service.AppUtil;
import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppService;
import org.joget.apps.app.dao.EnvironmentVariableDao;
import org.joget.apps.app.model.EnvironmentVariable;
import org.joget.apps.form.model.Element;
import org.joget.apps.form.model.FormData;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.text.DecimalFormat;
import org.joget.commons.util.StringUtil;
import org.joget.apps.form.model.FormStoreBinder;
import org.joget.plugin.base.PluginManager;

//Your App ID here
String appId = "SampleApp";

//Environment Variable ID here
String envId = "PaymentRunningNumber";

//ID generator field ID here
String genFieldId = "field3";

//ID generator value format
String format = "RECEIPT/#date.MMyy#/??????";

public FormRowSet store(Element element, FormRowSet rows, FormData formData) {
    FormRow row = rows.get(0);
    String result = incrementEnvVar(appId,envId);
    row.setProperty(genFieldId, result);
    
    //Reuse Workflow Form Binder to store data
    PluginManager pluginManager = (PluginManager) AppUtil.getApplicationContext().getBean("pluginManager");
    FormStoreBinder binder = (FormStoreBinder) pluginManager.getPlugin("org.joget.apps.form.lib.WorkflowFormBinder");
    binder.store(element, rows, formData);
        
    return rows;
}

public String incrementEnvVar(String appId, String envId) {
    AppService appService = (AppService) AppUtil.getApplicationContext().getBean("appService");

    /* Set null to always get latest version */
    //AppDefinition appDef = appService.getAppDefinition(appId,null);
    
    /* Set with publishedVersion to always get published version */
    Long publishedVersion = appService.getPublishedVersion(appId);
    AppDefinition appDef = appService.getAppDefinition(appId,publishedVersion.toString());
    
    EnvironmentVariableDao environmentVariableDao = (EnvironmentVariableDao) AppUtil.getApplicationContext().getBean("environmentVariableDao");
    EnvironmentVariable env = environmentVariableDao.loadById(envId, appDef);
    
    /* For testing only to check retrieved env-var */
    // System.out.println("This is env-var value --> " + env.getValue());
    
    Integer count = null;
    
    if (publishedVersion.compareTo(Long.parseLong("#appDef.version#")) == 0) {
        count = Integer.parseInt(env.getValue());
    } else {
        count = environmentVariableDao.getIncreasedCounter(envId, null, appDef);
    }
    String value = format;
    Matcher m = Pattern.compile("(\\?+)").matcher(format);
    if (m.find()) {
        String pattern = m.group(1);
        String formatter = pattern.replaceAll("\\?", "0");
        pattern = pattern.replaceAll("\\?", "\\\\?");
    
        DecimalFormat myFormatter = new DecimalFormat(formatter);
        String runningNumber = myFormatter.format(count);
        value = value.replaceAll(pattern, StringUtil.escapeRegex(runningNumber));
    }
    return value;
}

return store(element, rows, formData);