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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.consumer;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

import com.atlassian.jira.rest.client.domain.BasicIssue;
import com.atlassian.jira.rest.client.domain.Comment;
import com.atlassian.jira.rest.client.domain.Issue;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.jira.JIRAEndpoint;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Consumes new comments on JIRA issues.
 * 
 * NOTE: In your JQL, try to optimize the query as much as possible!  For example, the JIRA Toolkit Plugin includes a
// "Number of comments" custom field -- use '"Number of comments" > 0' in your query.  Also try to minimize based on
// state (status=Open), increase the polling delay, etc.  We have to do a separate query for *every single* resulting
 * ticket in order to load its comments!  For large organizations, the JIRA API can be significantly slow.
 */
public class NewCommentConsumer extends AbstractJIRAConsumer {
    private static final transient Logger LOG = LoggerFactory.getLogger(NewCommentConsumer.class);

    private List commentIds = new ArrayList<>();

    public NewCommentConsumer(JIRAEndpoint endpoint, Processor processor) {
        super(endpoint, processor);
        LOG.info("JIRA NewCommentConsumer: Indexing current issue comments...");
        getComments();
    }

    @Override
    protected int poll() throws Exception {
        Stack newComments = getComments();
        while (!newComments.empty()) {
            Comment newComment = newComments.pop();
            Exchange e = getEndpoint().createExchange();
            e.getIn().setBody(newComment);
            getProcessor().process(e);
        }
        return newComments.size();
    }

    // In the end, we want *new* comments oldest to newest.
    private Stack getComments() {
        Stack newComments = new Stack<>();
        List issues = getIssues();
        for (BasicIssue issue : issues) {
            Issue fullIssue = client().getIssueClient().getIssue(issue.getKey(), null);
            for (Comment comment : fullIssue.getComments()) {
                if (!commentIds.contains(comment.getId())) {
                    newComments.push(comment);
                    commentIds.add(comment.getId());
                }
            }
        }
        return newComments;
    }
}