/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *******************************************************************************/
package org.apache.ofbiz.widget.renderer;

import java.util.Locale;

import org.apache.ofbiz.base.util.Debug;
import org.apache.ofbiz.base.util.UtilProperties;
import org.apache.ofbiz.base.util.UtilValidate;
import org.apache.ofbiz.entity.Delegator;
import org.apache.ofbiz.entity.GenericEntityException;
import org.apache.ofbiz.entity.model.ModelEntity;
import org.apache.ofbiz.entity.model.ModelReader;

/**
 * Util for working with Help Text
 */
public final class UtilHelpText {

    public static final String module = UtilHelpText.class.getName();

    private UtilHelpText () {}

    /**
     * Find the help text associated with an entity field.
     * 
     * @param entityName the entity name
     * @param fieldName the field name
     * @param delegator the delegator
     * @param locale the locale
     * @return the help text, or the resource propertyName if no help text exists
     */
    public static String getEntityFieldDescription(final String entityName, final String fieldName, final Delegator delegator, final Locale locale) {

        if (UtilValidate.isEmpty(entityName)) {
            // Debug.logWarning("entityName [" + entityName + "] is empty", module);
            return "";
        }
        if (UtilValidate.isEmpty(fieldName)) {
            Debug.logWarning("fieldName [" + fieldName + "] is empty", module);
            return "";
        }
        ModelReader reader = delegator.getModelReader();
        ModelEntity entity = null;
        try {
            if (!reader.getEntityNames().contains(entityName)) {
                Debug.logWarning("couldn't find entityName [" + entityName + "]", module);
                return "";
            }
            entity = reader.getModelEntity(entityName);
        } catch (GenericEntityException e) {
            Debug.logError(e, "Error getting help text for entity=" + entityName + " field " + fieldName, module);
            return "";
        }
        String entityResourceName = entity.getDefaultResourceName();
        String messageId = "FieldDescription." + entityName + "." + fieldName;
        String fieldDescription = UtilProperties.getMessage(entityResourceName, messageId, locale);
        if (fieldDescription.equals(messageId)) {
            messageId = "FieldDescription." + fieldName;
            if (Debug.verboseOn()) {
                Debug.logVerbose("No help text found in [" + entityResourceName + "] with key [" + messageId + "], Trying with: " + messageId, module);
            }
            fieldDescription = UtilProperties.getMessage(entityResourceName, messageId, locale);
            if (fieldDescription.equals(messageId)) {
                if (Debug.verboseOn()) {
                    Debug.logVerbose("No help text found in [" + entityResourceName + "] with key [" + messageId + "]", module);
                }
                return "";
            }
        }
        return fieldDescription;
    }
}