/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.common.transaction.api;

import org.openecomp.sdc.common.transaction.api.TransactionUtils.DBActionCodeEnum;
import org.openecomp.sdc.common.transaction.api.TransactionUtils.LogMessages;
import org.openecomp.sdc.common.util.MethodActivationStatusEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Stack;

public abstract class RollbackHandler implements IDBType {

    // TODO test using slf4j-test and make this final
    private static Logger log = LoggerFactory.getLogger(RollbackHandler.class.getName());
    private Stack<IDBAction> dbActionRollbacks;

    private Integer transactionId;
    private String userId, actionType;

    protected RollbackHandler(Integer transactionId, String userId, String actionType) {
        if (isRollbackForPersistenceData()) {
            dbActionRollbacks = new Stack<>();
        }
        this.transactionId = transactionId;
        this.userId = userId;
        this.actionType = actionType;
    }

    public MethodActivationStatusEnum addRollbackAction(IDBAction rollbackAction) {
        MethodActivationStatusEnum result = MethodActivationStatusEnum.SUCCESS;
        if (isRollbackForPersistenceData()) {
            dbActionRollbacks.push(rollbackAction);
        } else {
            result = MethodActivationStatusEnum.NOT_ALLOWED;
        }
        return result;
    }

    public DBActionCodeEnum doRollback() {
        DBActionCodeEnum result;

        try {
            if (isRollbackForPersistenceData()) {
                result = doPersistenceDataRollback();
            } else {
                log.debug(LogMessages.ROLLBACK_NON_PERSISTENT_ACTION, getDBType().name(), transactionId, userId, actionType);
                log.debug(TransactionUtils.TRANSACTION_MARKER, LogMessages.ROLLBACK_NON_PERSISTENT_ACTION, getDBType().name(), transactionId, userId, actionType);
                result = doNonPersistenceDataRollback();
            }
            if (result != DBActionCodeEnum.SUCCESS) {
                log.error(LogMessages.ROLLBACK_FAILED_ON_DB, transactionId, getDBType().name(), userId, actionType);
                log.error(TransactionUtils.TRANSACTION_MARKER, LogMessages.ROLLBACK_FAILED_ON_DB, transactionId, getDBType().name(), userId, actionType);
            }

        } catch (Exception e) {
            result = DBActionCodeEnum.FAIL_GENERAL;
            log.error(LogMessages.ROLLBACK_FAILED_ON_DB_WITH_EXCEPTION, transactionId, getDBType().name(), e.getMessage(), userId, actionType);
            log.debug(LogMessages.ROLLBACK_FAILED_ON_DB_WITH_EXCEPTION, transactionId, getDBType().name(), e.getMessage(), userId, actionType, e);
            log.error(TransactionUtils.TRANSACTION_MARKER, LogMessages.ROLLBACK_FAILED_ON_DB_WITH_EXCEPTION, transactionId, getDBType().name(), e.getMessage(), userId, actionType);
        }

        return result;
    }

    private <T> DBActionCodeEnum doPersistenceDataRollback() {
        DBActionCodeEnum result = DBActionCodeEnum.SUCCESS;
        while (!dbActionRollbacks.empty()) {
            log.debug(LogMessages.ROLLBACK_PERSISTENT_ACTION, getDBType().name(), transactionId, userId, actionType);
            log.debug(TransactionUtils.TRANSACTION_MARKER, LogMessages.ROLLBACK_PERSISTENT_ACTION, getDBType().name(), transactionId, userId, actionType);
            IDBAction rollbackAction = dbActionRollbacks.pop();
            T rollbackResult = rollbackAction.doAction();
            if (!isRollbackResultValid()) {
                result = DBActionCodeEnum.FAIL_GENERAL;
            }
        }
        return result;
    }

    /**
     * Override for specific logic
     *
     * @param <T>
     */
    public <T> boolean isRollbackResultValid() {
        return true;
    }

    /**
     * Override for specific logic
     */
    public DBActionCodeEnum doNonPersistenceDataRollback() {
        return DBActionCodeEnum.SUCCESS;
    }

    protected abstract boolean isRollbackForPersistenceData();

    /**
     * Only Used for Unit Tests !
     */
    // TODO test using slf4j-test and remove this
    public static void setLog(Logger log) {
        RollbackHandler.log = log;
    }
}