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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.slack;

import java.io.IOException;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;

import com.slack.api.Slack;
import com.slack.api.SlackConfig;
import com.slack.api.methods.SlackApiException;
import com.slack.api.methods.response.conversations.ConversationsHistoryResponse;
import com.slack.api.methods.response.conversations.ConversationsListResponse;
import com.slack.api.model.Conversation;
import com.slack.api.model.Message;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePropertyKey;
import org.apache.camel.Processor;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.component.slack.helper.SlackHelper;
import org.apache.camel.support.ScheduledBatchPollingConsumer;
import org.apache.camel.util.CastUtils;
import org.apache.camel.util.ObjectHelper;

public class SlackConsumer extends ScheduledBatchPollingConsumer {

    public static final long DEFAULT_CONSUMER_DELAY = 10 * 1000L;

    private static final int CONVERSATIONS_LIST_LIMIT = 200;
    private final SlackEndpoint slackEndpoint;
    private Slack slack;
    private String timestamp;
    private String channelId;

    public SlackConsumer(SlackEndpoint endpoint, Processor processor) {
        super(endpoint, processor);
        this.slackEndpoint = endpoint;
    }

    @Override
    protected void doStart() throws Exception {
        SlackConfig config = SlackHelper.createSlackConfig(slackEndpoint.getServerUrl());
        CustomSlackHttpClient client = new CustomSlackHttpClient();
        this.slack = Slack.getInstance(config, client);
        this.channelId = getChannelId(slackEndpoint.getChannel(), null);
        super.doStart();
    }

    @Override
    protected void doStop() throws Exception {
        super.doStop();
        if (slack != null) {
            slack.close();
        }
    }

    @Override
    protected int poll() throws Exception {
        // Maximum limit is 1000. Slack recommends no more than 200 results at a time.
        // https://api.slack.com/methods/conversations.history
        // We set the limit to 1 the first call to set the timestamp of the last message of the history
        ConversationsHistoryResponse response = slack.methods(slackEndpoint.getToken()).conversationsHistory(req -> req
                .channel(channelId)
                .oldest(timestamp)
                .limit(timestamp != null ? Integer.parseInt(slackEndpoint.getMaxResults()) : 1));

        if (!response.isOk()) {
            throw new RuntimeCamelException("API request conversations.history to Slack failed: " + response);
        }

        // okay we have some response from slack so lets mark the consumer as ready
        forceConsumerAsReady();

        Queue exchanges = createExchanges(response.getMessages());
        return processBatch(CastUtils.cast(exchanges));
    }

    private Queue createExchanges(final List list) {
        Queue answer = new LinkedList<>();
        if (ObjectHelper.isNotEmpty(list)) {
            if (slackEndpoint.isNaturalOrder()) {
                for (int i = list.size() - 1; i >= 0; i--) {
                    Message message = list.get(i);
                    if (i == 0) {
                        timestamp = message.getTs();
                    }
                    Exchange exchange = createExchange(message);
                    answer.add(exchange);
                }
            } else {
                for (int i = 0; i < list.size(); i++) {
                    Message message = list.get(i);
                    if (i == 0) {
                        timestamp = message.getTs();
                    }
                    Exchange exchange = createExchange(message);
                    answer.add(exchange);
                }
            }
        }
        return answer;
    }

    @Override
    public int processBatch(Queue