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package io.moquette.persistence;

import io.moquette.broker.IRetainedRepository;
import io.moquette.broker.RetainedMessage;
import io.moquette.broker.subscriptions.Topic;
import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.mqtt.MqttPublishMessage;
import org.h2.mvstore.MVMap;
import org.h2.mvstore.MVStore;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class H2RetainedRepository implements IRetainedRepository {

    private final MVMap queueMap;

    public H2RetainedRepository(MVStore mvStore) {
        this.queueMap = mvStore.openMap("retained_store");
    }

    @Override
    public void cleanRetained(Topic topic) {
        queueMap.remove(topic);
    }

    @Override
    public void retain(Topic topic, MqttPublishMessage msg) {
        final ByteBuf payload = msg.content();
        byte[] rawPayload = new byte[payload.readableBytes()];
        payload.getBytes(0, rawPayload);
        final RetainedMessage toStore = new RetainedMessage(topic, msg.fixedHeader().qosLevel(), rawPayload);
        queueMap.put(topic, toStore);
    }

    @Override
    public boolean isEmpty() {
        return queueMap.isEmpty();
    }

    @Override
    public List retainedOnTopic(String topic) {
        final Topic searchTopic = new Topic(topic);
        final List matchingMessages = new ArrayList<>();
        for (Map.Entry entry : queueMap.entrySet()) {
            final Topic scanTopic = entry.getKey();
            if (scanTopic.match(searchTopic)) {
                matchingMessages.add(entry.getValue());
            }
        }

        return matchingMessages;
    }
}