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package io.shardingjdbc.spring.boot;

import com.google.common.base.Preconditions;
import io.shardingjdbc.core.api.MasterSlaveDataSourceFactory;
import io.shardingjdbc.core.api.ShardingDataSourceFactory;
import io.shardingjdbc.core.exception.ShardingJdbcException;
import io.shardingjdbc.core.util.DataSourceUtil;
import io.shardingjdbc.spring.boot.masterslave.SpringBootMasterSlaveRuleConfigurationProperties;
import io.shardingjdbc.spring.boot.sharding.SpringBootShardingRuleConfigurationProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

/**
 * Spring boot sharding and master-slave configuration.
 *
 * @author caohao
 */
@Configuration
@EnableConfigurationProperties({SpringBootShardingRuleConfigurationProperties.class, SpringBootMasterSlaveRuleConfigurationProperties.class})
public class SpringBootConfiguration implements EnvironmentAware {
    
    @Autowired
    private SpringBootShardingRuleConfigurationProperties shardingProperties;
    
    @Autowired
    private SpringBootMasterSlaveRuleConfigurationProperties masterSlaveProperties;
    
    private final Map dataSourceMap = new HashMap<>();
    
    @Bean
    public DataSource dataSource() throws SQLException {
        return null == masterSlaveProperties.getMasterDataSourceName() 
                ? ShardingDataSourceFactory.createDataSource(dataSourceMap, shardingProperties.getShardingRuleConfiguration(), shardingProperties.getConfigMap(), shardingProperties.getProps())
                : MasterSlaveDataSourceFactory.createDataSource(dataSourceMap, masterSlaveProperties.getMasterSlaveRuleConfiguration(), masterSlaveProperties.getConfigMap());
    }
    
    @Override
    public void setEnvironment(final Environment environment) {
        setDataSourceMap(environment);
    }
    
    private void setDataSourceMap(final Environment environment) {
        RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(environment, "sharding.jdbc.datasource.");
        String dataSources = propertyResolver.getProperty("names");
        for (String each : dataSources.split(",")) {
            try {
                Map dataSourceProps = propertyResolver.getSubProperties(each + ".");
                Preconditions.checkState(!dataSourceProps.isEmpty(), "Wrong datasource properties!");
                DataSource dataSource = DataSourceUtil.getDataSource(dataSourceProps.get("type").toString(), dataSourceProps);
                dataSourceMap.put(each, dataSource);
            } catch (final ReflectiveOperationException ex) {
                throw new ShardingJdbcException("Can't find datasource type!", ex);
            }
        }
    }
}