/*
 * 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.sling.distribution.queue.impl.jobhandling;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.apache.sling.distribution.queue.DistributionQueueEntry;
import org.apache.sling.distribution.queue.DistributionQueueItem;
import org.apache.sling.distribution.queue.DistributionQueueItemState;
import org.apache.sling.distribution.queue.DistributionQueueItemStatus;
import org.apache.sling.event.jobs.Job;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class JobHandlingUtils {
    private final static Logger log = LoggerFactory.getLogger(JobHandlingUtils.class);

    private static final String ID_START = "dstrpck-";

    private static final String DISTRIBUTION_PACKAGE_PREFIX = "distribution.";
    private static final String DISTRIBUTION_PACKAGE_ID = DISTRIBUTION_PACKAGE_PREFIX + "item.id";
    private static final String DISTRIBUTION_PACKAGE_SIZE = DISTRIBUTION_PACKAGE_PREFIX + "package.size";

    public static DistributionQueueItem getItem(final Job job) {

        Map<String, Object> properties = new HashMap<String, Object>();

        String packageId = (String) job.getProperty(DISTRIBUTION_PACKAGE_ID);
        Object sizeProperty = job.getProperty(DISTRIBUTION_PACKAGE_SIZE);
        long size;
        if (sizeProperty != null) {
            size = Long.valueOf(sizeProperty.toString());
        } else {
            size = -1;
        }

        try {
            Set<String> propertyNames = job.getPropertyNames();
            for (String key : propertyNames) {
                if (key.startsWith(DISTRIBUTION_PACKAGE_PREFIX)) {
                    String infoKey = key.substring(DISTRIBUTION_PACKAGE_PREFIX.length());
                    properties.put(infoKey, job.getProperty(key));
                }
            }
        } catch (Throwable t) {
            log.error("Cannot read job {} properties", job.getId(), t);
        }

        return new DistributionQueueItem(packageId, size, properties);
    }

    public static Map<String, Object> createFullProperties(DistributionQueueItem queueItem) {
        Map<String, Object> properties = new HashMap<String, Object>();

        for (String key : queueItem.keySet()) {
            Object value = queueItem.get(key);
            if (value != null) {
                properties.put(DISTRIBUTION_PACKAGE_PREFIX + key, queueItem.get(key));
            }
        }

        properties.put(DISTRIBUTION_PACKAGE_ID, queueItem.getPackageId());
        properties.put(DISTRIBUTION_PACKAGE_SIZE, queueItem.getSize());

        return properties;
    }

    @Nullable
    private static String getQueueName(Job job) {

        String topic = job.getTopic();
        if (topic == null || !topic.startsWith(JobHandlingDistributionQueue.DISTRIBUTION_QUEUE_TOPIC)) return null;

        String queue = topic.substring(JobHandlingDistributionQueue.DISTRIBUTION_QUEUE_TOPIC.length() + 1);


        int idx = queue.lastIndexOf("/");

        if (idx < 0) return "";

        return queue.substring(idx + 1);
    }

    public static DistributionQueueItemStatus getStatus(final Job job) {
        String queueName = getQueueName(job);
        int attempts = job.getRetryCount();

        return new DistributionQueueItemStatus(job.getCreated(),
                attempts > 0 ? DistributionQueueItemState.ERROR : DistributionQueueItemState.QUEUED,
                attempts, queueName);
    }

    @Nullable
    public static DistributionQueueEntry getEntry(final Job job) {
        DistributionQueueItem item = getItem(job);
        DistributionQueueItemStatus itemStatus = getStatus(job);

        if (item != null && itemStatus != null) {
            return new DistributionQueueEntry(escapeId(job.getId()), item, itemStatus);
        }

        return null;
    }

    private static String escapeId(String jobId) {
        //return id;
        if (jobId == null) {
            return null;
        }
        return ID_START + jobId.replace("/", "--");
    }

    public static String unescapeId(String itemId) {
        if (itemId == null) {
            return null;
        }
        if (!itemId.startsWith(ID_START)) {
            return null;
        }

        return itemId.replace(ID_START, "").replace("--", "/");
    }


}