/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jbpm.process.workitem.core;

import java.util.HashMap;
import java.util.Map;

import org.jbpm.bpmn2.handler.WorkItemHandlerRuntimeException;
import org.jbpm.workflow.instance.node.WorkItemNodeInstance;
import org.kie.api.runtime.process.NodeInstance;
import org.kie.api.runtime.process.NodeInstanceContainer;
import org.kie.api.runtime.process.ProcessWorkItemHandlerException;
import org.kie.api.runtime.process.WorkItemHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class AbstractLogOrThrowWorkItemHandler implements WorkItemHandler {

    private static final Logger logger = LoggerFactory.getLogger(AbstractLogOrThrowWorkItemHandler.class);
    protected boolean logThrownException = false;
    
    protected String handlingProcessId;
    protected String handlingStrategy;

    public void setLogThrownException(boolean logException) {
        this.logThrownException = logException;
    }

    protected void handleException(Throwable cause) {
        handleException(cause,
                        new HashMap<String, Object>());
    }

    protected void handleException(Throwable cause,
                                   Map<String, Object> handlerInfoMap) {
        if (handlingProcessId != null && handlingStrategy != null) {
            throw new ProcessWorkItemHandlerException(handlingProcessId, handlingStrategy, cause);
        }
        
        
        String service = (String) handlerInfoMap.get("Interface");
        String operation = (String) handlerInfoMap.get("Operation");

        if (this.logThrownException) {
            String message;
            if (service != null) {
                message = this.getClass().getSimpleName() + " failed when calling " + service + "." + operation;
            } else {
                message = this.getClass().getSimpleName() + " failed while trying to complete the task.";
            }
            logger.error(message,
                         cause);
        } else {
            WorkItemHandlerRuntimeException wihRe = new WorkItemHandlerRuntimeException(cause);
            for (String key : handlerInfoMap.keySet()) {
                wihRe.setInformation(key,
                                     handlerInfoMap.get(key));
            }
            wihRe.setInformation(WorkItemHandlerRuntimeException.WORKITEMHANDLERTYPE,
                                 this.getClass().getSimpleName());
            throw wihRe;
        }
    }

    protected WorkItemNodeInstance findNodeInstance(long workItemId,
                                                    NodeInstanceContainer container) {
        for (NodeInstance nodeInstance : container.getNodeInstances()) {
            if (nodeInstance instanceof WorkItemNodeInstance) {
                WorkItemNodeInstance workItemNodeInstance = (WorkItemNodeInstance) nodeInstance;
                if (workItemNodeInstance.getWorkItem().getId() == workItemId) {
                    return workItemNodeInstance;
                }
            }
            if (nodeInstance instanceof NodeInstanceContainer) {
                WorkItemNodeInstance result = findNodeInstance(workItemId,
                                                               ((NodeInstanceContainer) nodeInstance));
                if (result != null) {
                    return result;
                }
            }
        }
        return null;
    }
}
