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package com.github.lontime.extpac4j.impl;

import java.time.Duration;

import com.github.lontime.extredisson.RedissonInstance;
import com.github.lontime.shaded.com.github.benmanes.caffeine.cache.Cache;
import com.github.lontime.shaded.com.github.benmanes.caffeine.cache.Caffeine;
import com.github.lontime.shaded.org.redisson.api.RedissonClient;
import org.pac4j.core.context.JEEContext;

/**
 * LocalJEESessionStore.
 * @author lontime
 * @since 1.0
 */
public class LocalJEESessionStore extends LocalSimpleJEESessionStore {

    public static final LocalJEESessionStore INSTANCE = new LocalJEESessionStore();

    public static final String TOPIC_SESSION_REMOVED = "sessionRemoved";

    private final RedissonClient redissonClient;

    private Cache removed;

    public LocalJEESessionStore() {
        this(null);
    }

    public LocalJEESessionStore(String redissonName) {
        super();
        this.redissonClient = RedissonInstance.get().client(redissonName);
        this.removed = Caffeine.newBuilder().expireAfterAccess(Duration.ofMinutes(10)).build();
        redissonClient.getTopic(TOPIC_SESSION_REMOVED).addListener(String.class, (channel, msg) -> {
            if (cache.getIfPresent(msg) != null) {
                removed.put(msg, true);
            }
        });
    }

    @Override
    protected boolean check(JEEContext context) {
        final String sid = getSessionId(context);
        if (removed.getIfPresent(sid) != null) {
            delegate.destroySession(context);
            cache.invalidate(sid);
            removed.invalidate(sid);
            return true;
        }
        return false;
    }

    @Override
    protected void cleanup(String id) {
        redissonClient.getTopic(TOPIC_SESSION_REMOVED).publish(id);
        removed.invalidate(id);
    }
}