/**
 * Copyright © 2016-2022 The Thingsboard Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.thingsboard.server.service.install.update;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.context.annotation.Profile;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Objects;
import java.util.Optional;

@RequiredArgsConstructor
@Service
@Profile("install")
@Slf4j
public class DefaultCacheCleanupService implements CacheCleanupService {

    private final CacheManager cacheManager;
    private final Optional<RedisTemplate<String, Object>> redisTemplate;


    /**
     * Cleanup caches that can not deserialize anymore due to schema upgrade or data update using sql scripts.
     * Refer to SqlDatabaseUpgradeService and /data/upgrage/*.sql
     * to discover which tables were changed
     * */
    @Override
    public void clearCache(String fromVersion) throws Exception {
        switch (fromVersion) {
            case "3.0.1":
                log.info("Clear cache to upgrade from version 3.0.1 to 3.1.0 ...");
                clearAllCaches();
                //do not break to show explicit calls for next versions
            case "3.1.1":
                log.info("Clear cache to upgrade from version 3.1.1 to 3.2.0 ...");
                clearCacheByName("devices");
                clearCacheByName("deviceProfiles");
                clearCacheByName("tenantProfiles");
            case "3.2.2":
                log.info("Clear cache to upgrade from version 3.2.2 to 3.3.0 ...");
                clearCacheByName("devices");
                clearCacheByName("deviceProfiles");
                clearCacheByName("tenantProfiles");
                clearCacheByName("relations");
                break;
            case "3.3.2":
                log.info("Clear cache to upgrade from version 3.3.2 to 3.3.3 ...");
                clearAll();
                break;
            case "3.3.3":
                log.info("Clear cache to upgrade from version 3.3.3 to 3.3.4 ...");
                clearAll();
                break;
            case "3.3.4":
                log.info("Clear cache to upgrade from version 3.3.4 to 3.4.0 ...");
                clearAll();
                break;
            default:
                //Do nothing, since cache cleanup is optional.
        }
    }

    void clearAllCaches() {
        cacheManager.getCacheNames().forEach(this::clearCacheByName);
    }

    void clearCacheByName(final String cacheName) {
        Cache cache = cacheManager.getCache(cacheName);
        Objects.requireNonNull(cache, "Cache does not exist for name " + cacheName);
        cache.clear();
    }

    void clearAll() {
        redisTemplate.ifPresent(rt -> rt.execute(connection ->
                connection.execute("FLUSHALL"), false));
    }
}
