/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.shardingsphere.mode.metadata.decorator;

import lombok.RequiredArgsConstructor;
import org.apache.shardingsphere.infra.config.rule.RuleConfiguration;
import org.apache.shardingsphere.infra.instance.ComputeNodeInstanceContext;
import org.apache.shardingsphere.infra.spi.type.typed.TypedSPILoader;
import org.apache.shardingsphere.mode.spi.RuleConfigurationPersistDecorator;

import java.util.Collection;
import java.util.stream.Collectors;

/**
 * Rule configuration persist decorate engine.
 */
@RequiredArgsConstructor
public final class RuleConfigurationPersistDecorateEngine {
    
    private final ComputeNodeInstanceContext computeNodeInstanceContext;
    
    /**
     * Decorate rule configurations.
     *
     * @param ruleConfigs to be decorated rule configurations
     * @return decorated rule configurations
     */
    @SuppressWarnings("unchecked")
    public Collection<RuleConfiguration> decorate(final Collection<RuleConfiguration> ruleConfigs) {
        if (!computeNodeInstanceContext.getModeConfiguration().isCluster()) {
            return ruleConfigs;
        }
        return ruleConfigs.stream()
                .map(each -> TypedSPILoader.findService(RuleConfigurationPersistDecorator.class, each.getClass()).map(optional -> optional.decorate(each)).orElse(each)).collect(Collectors.toList());
    }
    
    /**
     * Restore rule configurations.
     *
     * @param ruleConfigs to be restored rule configurations
     * @return restored rule configurations
     */
    @SuppressWarnings("unchecked")
    public Collection<RuleConfiguration> restore(final Collection<RuleConfiguration> ruleConfigs) {
        if (!computeNodeInstanceContext.getModeConfiguration().isCluster()) {
            return ruleConfigs;
        }
        return ruleConfigs.stream()
                .map(each -> TypedSPILoader.findService(RuleConfigurationPersistDecorator.class, each.getClass()).map(optional -> optional.restore(each)).orElse(each)).collect(Collectors.toList());
    }
    
    /**
     * Try to restore rule configurations.
     *
     * @param ruleConfigs to be restored rule configurations
     * @return restored rule configurations
     */
    @SuppressWarnings("unchecked")
    public Collection<RuleConfiguration> tryRestore(final Collection<RuleConfiguration> ruleConfigs) {
        return ruleConfigs.stream().map(each -> TypedSPILoader.findService(RuleConfigurationPersistDecorator.class, each.getClass())
                .filter(optional -> optional.canBeRestored(each)).map(optional -> optional.restore(each)).orElse(each)).collect(Collectors.toList());
    }
}
