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package redis.clients.jedis;

import static redis.clients.jedis.Protocol.Keyword.MESSAGE;
import static redis.clients.jedis.Protocol.Keyword.PMESSAGE;
import static redis.clients.jedis.Protocol.Keyword.PSUBSCRIBE;
import static redis.clients.jedis.Protocol.Keyword.PUNSUBSCRIBE;
import static redis.clients.jedis.Protocol.Keyword.SUBSCRIBE;
import static redis.clients.jedis.Protocol.Keyword.UNSUBSCRIBE;

import java.util.Arrays;
import java.util.List;

import redis.clients.jedis.exceptions.JedisConnectionException;
import redis.clients.jedis.exceptions.JedisException;
import redis.clients.util.SafeEncoder;

public abstract class JedisPubSub {
    private int subscribedChannels = 0;
    private Client client;

    public abstract void onMessage(String channel, String message);

    public abstract void onPMessage(String pattern, String channel,
            String message);

    public abstract void onSubscribe(String channel, int subscribedChannels);

    public abstract void onUnsubscribe(String channel, int subscribedChannels);

    public abstract void onPUnsubscribe(String pattern, int subscribedChannels);

    public abstract void onPSubscribe(String pattern, int subscribedChannels);

    public void unsubscribe() {
        if (client == null) {
            throw new JedisConnectionException(
                    "JedisPubSub was not subscribed to a Jedis instance.");
        }
        client.unsubscribe();
        client.flush();
    }

    public void unsubscribe(String... channels) {
        client.unsubscribe(channels);
        client.flush();
    }

    public void subscribe(String... channels) {
        client.subscribe(channels);
        client.flush();
    }

    public void psubscribe(String... patterns) {
        client.psubscribe(patterns);
        client.flush();
    }

    public void punsubscribe() {
        client.punsubscribe();
        client.flush();
    }

    public void punsubscribe(String... patterns) {
        client.punsubscribe(patterns);
        client.flush();
    }

    public boolean isSubscribed() {
        return subscribedChannels > 0;
    }

    public void proceedWithPatterns(Client client, String... patterns) {
        this.client = client;
        client.psubscribe(patterns);
        client.flush();
        process(client);
    }

    public void proceed(Client client, String... channels) {
        this.client = client;
        client.subscribe(channels);
        client.flush();
        process(client);
    }

    private void process(Client client) {
        do {
            List