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/*
 * 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.camel.component.jira.producer;

import com.atlassian.jira.rest.client.api.IssueRestClient;
import com.atlassian.jira.rest.client.api.JiraRestClient;
import com.atlassian.jira.rest.client.api.domain.Issue;
import org.apache.camel.Exchange;
import org.apache.camel.component.jira.JiraEndpoint;
import org.apache.camel.support.DefaultProducer;
import org.apache.camel.util.ObjectHelper;

import static org.apache.camel.component.jira.JiraConstants.ISSUE_KEY;
import static org.apache.camel.component.jira.JiraConstants.ISSUE_WATCHERS_ADD;
import static org.apache.camel.component.jira.JiraConstants.ISSUE_WATCHERS_REMOVE;

public class WatcherProducer extends DefaultProducer {

    public WatcherProducer(JiraEndpoint endpoint) {
        super(endpoint);
    }

    @Override
    public void process(Exchange exchange) {
        String issueKey = exchange.getIn().getHeader(ISSUE_KEY, String.class);
        String watchersAdd = exchange.getIn().getHeader(ISSUE_WATCHERS_ADD, String.class);
        String watchersRemove = exchange.getIn().getHeader(ISSUE_WATCHERS_REMOVE, String.class);
        if (issueKey == null) {
            throw new IllegalArgumentException(
                    "Missing exchange input header named 'IssueKey', it should specify the issue key to add/remove watchers to.");
        }
        JiraRestClient client = ((JiraEndpoint) getEndpoint()).getClient();
        boolean hasWatchersToAdd = ObjectHelper.isNotEmpty(watchersAdd);
        boolean hasWatchersToRemove = ObjectHelper.isNotEmpty(watchersRemove);
        if (hasWatchersToAdd || hasWatchersToRemove) {
            IssueRestClient issueClient = client.getIssueClient();
            Issue issue = issueClient.getIssue(issueKey).claim();
            if (hasWatchersToAdd) {
                String[] watArr = watchersAdd.split(",");
                for (String s : watArr) {
                    String watcher = s.trim();
                    if (!watcher.isEmpty()) {
                        issueClient.addWatcher(issue.getWatchers().getSelf(), watcher);
                    }
                }
            }
            if (hasWatchersToRemove) {
                String[] watArr = watchersRemove.split(",");
                for (String s : watArr) {
                    String watcher = s.trim();
                    if (!watcher.isEmpty()) {
                        issueClient.removeWatcher(issue.getWatchers().getSelf(), watcher);
                    }
                }
            }
        }
    }
}