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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.security;

import com.github.rholder.retry.RetryException;
import com.github.rholder.retry.Retryer;
import com.github.rholder.retry.RetryerBuilder;
import com.github.rholder.retry.StopStrategies;
import com.github.rholder.retry.WaitStrategies;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.mongodb.DuplicateKeyException;
import org.apache.shiro.session.Session;
import org.apache.shiro.session.mgt.SimpleSession;
import org.apache.shiro.session.mgt.eis.CachingSessionDAO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Inject;
import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

public class MongoDbSessionDAO extends CachingSessionDAO {
    private static final Logger LOG = LoggerFactory.getLogger(MongoDbSessionDAO.class);

    private final MongoDBSessionService mongoDBSessionService;

    @Inject
    public MongoDbSessionDAO(MongoDBSessionService mongoDBSessionService, EventBus eventBus) {
        this.mongoDBSessionService = mongoDBSessionService;
        eventBus.register(this);
    }

    @SuppressWarnings("unused")
    @Subscribe
    public void sessionDeleted(SessionDeletedEvent event) {
        final Session cachedSession = getCachedSession(event.sessionId());
        if (cachedSession != null) {
            LOG.debug("Removing deleted session from cache.");
            uncache(cachedSession);
        }
    }

    @Override
    protected Serializable doCreate(Session session) {
        final Serializable id = generateSessionId(session);
        assignSessionId(session, id);

        Map fields = Maps.newHashMap();
        fields.put("session_id", id);
        fields.put("host", session.getHost());
        fields.put("start_timestamp", session.getStartTimestamp());
        fields.put("last_access_time", session.getLastAccessTime());
        fields.put("timeout", session.getTimeout());
        Map attributes = Maps.newHashMap();
        for (Object key : session.getAttributeKeys()) {
            attributes.put(key.toString(), session.getAttribute(key));
        }
        final MongoDbSession dbSession = new MongoDbSession(fields);
        dbSession.setAttributes(attributes);
        final String objectId = mongoDBSessionService.saveWithoutValidation(dbSession);
        LOG.debug("Created session {}", objectId);

        return id;
    }

    @Override
    protected Session doReadSession(Serializable sessionId) {
        final MongoDbSession dbSession = mongoDBSessionService.load(sessionId.toString());
        if (dbSession == null) {
            // expired session or it was never there to begin with
            return null;
        }
        return mongoDBSessionService.daoToSimpleSession(dbSession);
    }

    @Override
    protected void doUpdate(Session session) {
        final MongoDbSession dbSession = mongoDBSessionService.load(session.getId().toString());

        if (null == dbSession) {
            throw new RuntimeException("Couldn't load session");
        }

        LOG.debug("Updating session");
        dbSession.setHost(session.getHost());
        dbSession.setTimeout(session.getTimeout());
        dbSession.setStartTimestamp(session.getStartTimestamp());
        dbSession.setLastAccessTime(session.getLastAccessTime());

        if (session instanceof SimpleSession) {
            final SimpleSession simpleSession = (SimpleSession) session;
            dbSession.setAttributes(simpleSession.getAttributes());
            dbSession.setExpired(simpleSession.isExpired());
        } else {
            throw new RuntimeException("Unsupported session type: " + session.getClass().getCanonicalName());
        }
        // Due to https://jira.mongodb.org/browse/SERVER-14322 upserts can fail under concurrency.
        // We need to retry the update, and stagger them a bit, so no all of the retries attempt it at the same time again.
        // Usually this should succeed the first time, though
        final Retryer