/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - SnmpTagList.java  
  _## 
  _##  Copyright (C) 2005-2025  Frank Fock (SNMP4J.org)
  _##  
  _##  Licensed 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.snmp4j.agent.mo.snmp;

import org.snmp4j.agent.mo.MOMutableColumn;
import org.snmp4j.agent.MOAccess;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.Variable;
import org.snmp4j.smi.SMIConstants;
import org.snmp4j.smi.OctetString;
import org.snmp4j.mp.SnmpConstants;

import java.util.Set;
import java.util.HashSet;
import java.util.Collection;

public class SnmpTagList extends MOMutableColumn<OctetString> {

    private static final OctetString TAG_DELIMITER = new OctetString(" \t\r\n");

    public SnmpTagList(int columnID, MOAccess access, OctetString defaultValue, boolean mutableInService) {
        super(columnID, SMIConstants.SYNTAX_OCTET_STRING,
                access, defaultValue, mutableInService);
    }

    public synchronized int validate(OctetString newValue, OctetString oldValue, OID instanceOID) {
        int status = super.validate(newValue, oldValue, instanceOID);
        if (status == SnmpConstants.SNMP_ERROR_SUCCESS) {
            return isValidTagList(newValue);
        }
        return status;
    }

    public static Set<OctetString> getTags(OctetString tagList) {
        Collection<OctetString> tags = OctetString.split(tagList, TAG_DELIMITER);
        return new HashSet<>(tags);
    }

    public static int isValidTagList(Variable newValue) {
        if (!(newValue instanceof OctetString)) {
            return SnmpConstants.SNMP_ERROR_WRONG_TYPE;
        }
        OctetString os = (OctetString) newValue;
        if (os.length() > 255) {
            return SnmpConstants.SNMP_ERROR_WRONG_LENGTH;
        } else if (os.length() > 0) {
            if (SnmpTagValue.isDelimiter(os.get(0)) ||
                    SnmpTagValue.isDelimiter(os.get(os.length() - 1))) {
                return SnmpConstants.SNMP_ERROR_BAD_VALUE;
            }
            boolean lastWasDelimiter = false;
            for (int i = 0; i < os.length() - 1; i++) {
                boolean isDelimiter = SnmpTagValue.isDelimiter(os.get(i));
                if (lastWasDelimiter && isDelimiter) {
                    return SnmpConstants.SNMP_ERROR_BAD_VALUE;
                }
                lastWasDelimiter = isDelimiter;
            }
        }
        return SnmpConstants.SNMP_ERROR_SUCCESS;
    }
}
