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package net.oschina.j2cache.cache.support.redis;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import net.oschina.j2cache.CacheProviderHolder;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;

import net.oschina.j2cache.cluster.ClusterPolicy;
import net.oschina.j2cache.Command;
import net.oschina.j2cache.J2CacheConfig;
import net.oschina.j2cache.cache.support.util.SpringUtil;

/**
 * 使用spring redis实现订阅功能
 * @author zhangsaizz
 */
public class SpringRedisPubSubPolicy implements ClusterPolicy {

	private final static int LOCAL_COMMAND_ID = Command.genRandomSrc(); //命令源标识，随机生成，每个节点都有唯一标识
	private RedisTemplate redisTemplate;

	private net.oschina.j2cache.autoconfigure.J2CacheConfig config;
	private CacheProviderHolder holder;

	/**
	 * 是否是主动模式
	 */
	private static boolean isActive = false;

	private String channel = "j2cache_channel";

	@Override
	public boolean isLocalCommand(Command cmd) {
		return cmd.getSrc() == LOCAL_COMMAND_ID;
	}

	@SuppressWarnings("unchecked")
	@Override
	public void connect(Properties props, CacheProviderHolder holder) {
		this.holder = holder;
		J2CacheConfig j2config = SpringUtil.getBean(J2CacheConfig.class);
		this.config = SpringUtil.getBean(net.oschina.j2cache.autoconfigure.J2CacheConfig.class);
		this.redisTemplate = SpringUtil.getBean("j2CacheRedisTemplate", RedisTemplate.class);
		if ("active".equals(config.getCacheCleanMode())) {
			isActive = true;
		}
		String channel_name = j2config.getL2CacheProperties().getProperty("channel");
		if (channel_name != null && !channel_name.isEmpty()) {
			this.channel = channel_name;
		}
		RedisMessageListenerContainer listenerContainer = SpringUtil.getBean("j2CacheRedisMessageListenerContainer",
				RedisMessageListenerContainer.class);

		listenerContainer.addMessageListener(new SpringRedisMessageListener(this, this.channel),
				new PatternTopic(this.channel));
		if (isActive) {
			// 设置键值回调
			ConfigureNotifyKeyspaceEventsAction action = new ConfigureNotifyKeyspaceEventsAction();
			action.config(listenerContainer.getConnectionFactory().getConnection());

			String namespace = j2config.getL2CacheProperties().getProperty("namespace");
			String database = j2config.getL2CacheProperties().getProperty("database");
			String expired = "__keyevent@" + (database == null || "".equals(database) ? "0" : database) + "__:expired";
			String del = "__keyevent@" + (database == null || "".equals(database) ? "0" : database) + "__:del";
			List topics = new ArrayList<>();
			topics.add(new PatternTopic(expired));
			topics.add(new PatternTopic(del));
			listenerContainer.addMessageListener(new SpringRedisActiveMessageListener(this, namespace), topics);
		}

	}

	/**
	 * 删除本地某个缓存条目
	 * @param region 区域名称
	 * @param keys   缓存键值
	 */
	public void evict(String region, String... keys) {
		holder.getLevel1Cache(region).evict(keys);
	}

	/**
	 * 清除本地整个缓存区域
	 * @param region 区域名称
	 */
	public void clear(String region) {
		holder.getLevel1Cache(region).clear();
	}

	// @Override
	// public void sendEvictCmd(String region, String... keys) {
	// if(!isActive || "blend".equals(config.getCacheCleanMode())) {
	// String com = new Command(Command.OPT_EVICT_KEY, region, keys).json();
	// redisTemplate.convertAndSend(this.channel, com);
	// }
	//
	// }

	// @Override
	// public void sendClearCmd(String region) {
	// if(!isActive || "blend".equals(config.getCacheCleanMode())) {
	// String com = new Command(Command.OPT_CLEAR_KEY, region, "").json();
	// redisTemplate.convertAndSend(this.channel, com);
	// }
	// }

	@Override
	public void publish(Command cmd) {
		if (!isActive || "blend".equals(config.getCacheCleanMode())) {
			redisTemplate.convertAndSend(this.channel, cmd.json());
		}
	}

	@Override
	public void disconnect() {
		redisTemplate.convertAndSend(this.channel, Command.quit().json());
	}

}