/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.core.jdbc.core.datasource;

import com.google.common.eventbus.Subscribe;
import io.shardingsphere.core.api.ConfigMapContext;
import io.shardingsphere.core.api.config.MasterSlaveRuleConfiguration;
import io.shardingsphere.core.api.config.ShardingRuleConfiguration;
import io.shardingsphere.core.constant.ConnectionMode;
import io.shardingsphere.core.constant.properties.ShardingProperties;
import io.shardingsphere.core.constant.properties.ShardingPropertiesConstant;
import io.shardingsphere.core.executor.ExecutorEngine;
import io.shardingsphere.core.executor.engine.connection.ConnectionStrictlyExecutorEngine;
import io.shardingsphere.core.executor.engine.memory.MemoryStrictlyExecutorEngine;
import io.shardingsphere.core.jdbc.adapter.AbstractDataSourceAdapter;
import io.shardingsphere.core.jdbc.core.ShardingContext;
import io.shardingsphere.core.jdbc.core.connection.ShardingConnection;
import io.shardingsphere.core.orche.eventbus.config.jdbc.JdbcConfigurationEventBusInstance;
import io.shardingsphere.core.orche.eventbus.config.jdbc.ShardingConfigurationEventBusEvent;
import io.shardingsphere.core.orche.eventbus.state.circuit.CircuitStateEventBusInstance;
import io.shardingsphere.core.orche.eventbus.state.disabled.DisabledStateEventBusInstance;
import io.shardingsphere.core.rule.MasterSlaveRule;
import io.shardingsphere.core.rule.ShardingRule;
import lombok.Getter;

import javax.sql.DataSource;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.SQLException;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Database that support sharding.
 *
 * @author zhangliang
 * @author zhaojun
 * @author panjuan
 */
public class ShardingDataSource extends AbstractDataSourceAdapter implements AutoCloseable {
    
    @Getter
    private ShardingProperties shardingProperties;
    
    private ShardingContext shardingContext;
    
    public ShardingDataSource(final Map<String, DataSource> dataSourceMap, final ShardingRule shardingRule) throws SQLException {
        this(dataSourceMap, shardingRule, new ConcurrentHashMap<String, Object>(), new Properties());
    }
    
    public ShardingDataSource(final Map<String, DataSource> dataSourceMap, final ShardingRule shardingRule, final Map<String, Object> configMap, final Properties props) throws SQLException {
        super(dataSourceMap.values());
        if (!configMap.isEmpty()) {
            ConfigMapContext.getInstance().getShardingConfig().putAll(configMap);
        }
        shardingProperties = new ShardingProperties(null == props ? new Properties() : props);
        int executorSize = shardingProperties.getValue(ShardingPropertiesConstant.EXECUTOR_SIZE);
        ConnectionMode connectionMode = ConnectionMode.valueOf(shardingProperties.<String>getValue(ShardingPropertiesConstant.CONNECTION_MODE));
        ExecutorEngine executorEngine = ConnectionMode.MEMORY_STRICTLY == connectionMode ? new MemoryStrictlyExecutorEngine(executorSize) : new ConnectionStrictlyExecutorEngine(executorSize);
        shardingContext = getShardingContext(dataSourceMap, executorEngine, shardingRule, connectionMode);
        JdbcConfigurationEventBusInstance.getInstance().register(this);
    }
    
    private ShardingContext getShardingContext(final Map<String, DataSource> dataSourceMap, final ExecutorEngine executorEngine, final ShardingRule shardingRule, final ConnectionMode connectionMode) {
        boolean showSQL = shardingProperties.getValue(ShardingPropertiesConstant.SQL_SHOW);
        ShardingContext result = new ShardingContext(dataSourceMap, shardingRule, getDatabaseType(), executorEngine, connectionMode, showSQL);
        DisabledStateEventBusInstance.getInstance().register(result);
        CircuitStateEventBusInstance.getInstance().register(result);
        return result;
    }
    
    /**
     * Renew sharding data source.
     *
     * @param shardingEvent sharding configuration event bus event.
     */
    @Subscribe
    public void renew(final ShardingConfigurationEventBusEvent shardingEvent) {
        
        ShardingProperties newShardingProperties = new ShardingProperties(null == shardingEvent.getProps() ? new Properties() : shardingEvent.getProps());
        int originalExecutorSize = shardingProperties.getValue(ShardingPropertiesConstant.EXECUTOR_SIZE);
        int newExecutorSize = newShardingProperties.getValue(ShardingPropertiesConstant.EXECUTOR_SIZE);
        ConnectionMode originalConnectionMode = ConnectionMode.valueOf(shardingProperties.<String>getValue(ShardingPropertiesConstant.CONNECTION_MODE));
        ConnectionMode newConnectionMode = ConnectionMode.valueOf(newShardingProperties.<String>getValue(ShardingPropertiesConstant.CONNECTION_MODE));
        shardingProperties = newShardingProperties;
        ExecutorEngine newExecutorEngine = shardingContext.getExecutorEngine();
        if (originalExecutorSize != newExecutorSize || originalConnectionMode != newConnectionMode) {
            newExecutorEngine = ConnectionMode.MEMORY_STRICTLY == newConnectionMode ? new MemoryStrictlyExecutorEngine(newExecutorSize) : new ConnectionStrictlyExecutorEngine(newExecutorSize);
        }
        shardingContext.renew(shardingEvent.getDataSourceMap(), shardingEvent.getShardingRule(), getDatabaseType(), newExecutorEngine, newConnectionMode,
                (boolean) newShardingProperties.getValue(ShardingPropertiesConstant.SQL_SHOW));
        closeOriginalDataSources();
    }
    
    private void closeOriginalDataSources() {
        Map<String, DataSource> originalDataSourceMap = shardingContext.getDataSourceMap();
        for (DataSource each : originalDataSourceMap.values()) {
            try {
                Method method = each.getClass().getDeclaredMethod("close");
                method.invoke(each);
            } catch (final NoSuchMethodException | InvocationTargetException | IllegalAccessException ignored) {
            }
        }
    }
    
    @Override
    public final ShardingConnection getConnection() {
        return new ShardingConnection(shardingContext);
    }
    
    // TODO To close data sources in dataSourceMap
    @Override
    public void close() {
        shardingContext.close();
    }
    
    protected static Map<String, DataSource> getRawDataSourceMap(final Map<String, DataSource> dataSourceMap) {
        Map<String, DataSource> result = new LinkedHashMap<>();
        if (null == dataSourceMap) {
            return result;
        }
        for (Map.Entry<String, DataSource> entry : dataSourceMap.entrySet()) {
            String dataSourceName = entry.getKey();
            DataSource dataSource = entry.getValue();
            if (dataSource instanceof MasterSlaveDataSource) {
                result.putAll(((MasterSlaveDataSource) dataSource).getAllDataSources());
            } else {
                result.put(dataSourceName, dataSource);
            }
        }
        return result;
    }
    
    protected static ShardingRuleConfiguration getShardingRuleConfiguration(final Map<String, DataSource> dataSourceMap, final ShardingRuleConfiguration shardingRuleConfig) {
        Collection<MasterSlaveRuleConfiguration> masterSlaveRuleConfigs = new LinkedList<>();
        if (null == dataSourceMap || !shardingRuleConfig.getMasterSlaveRuleConfigs().isEmpty()) {
            return shardingRuleConfig;
        }
        for (DataSource each : dataSourceMap.values()) {
            if (!(each instanceof MasterSlaveDataSource)) {
                continue;
            }
            MasterSlaveRule masterSlaveRule = ((MasterSlaveDataSource) each).getMasterSlaveRule();
            masterSlaveRuleConfigs.add(new MasterSlaveRuleConfiguration(
                    masterSlaveRule.getName(), masterSlaveRule.getMasterDataSourceName(), masterSlaveRule.getSlaveDataSourceNames(), masterSlaveRule.getLoadBalanceAlgorithm()));
        }
        shardingRuleConfig.setMasterSlaveRuleConfigs(masterSlaveRuleConfigs);
        return shardingRuleConfig;
    }
}

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