/*
 * Copyright 1999-2015 dangdang.com.
 * <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 com.dangdang.ddframe.rdb.sharding.example.jdbc.masterslave;

import com.dangdang.ddframe.rdb.sharding.api.HintManager;
import com.dangdang.ddframe.rdb.sharding.api.MasterSlaveDataSourceFactory;
import com.dangdang.ddframe.rdb.sharding.api.rule.BindingTableRule;
import com.dangdang.ddframe.rdb.sharding.api.rule.DataSourceRule;
import com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule;
import com.dangdang.ddframe.rdb.sharding.api.rule.TableRule;
import com.dangdang.ddframe.rdb.sharding.api.strategy.database.DatabaseShardingStrategy;
import com.dangdang.ddframe.rdb.sharding.api.strategy.table.TableShardingStrategy;
import com.dangdang.ddframe.rdb.sharding.example.jdbc.masterslave.algorithm.ModuloDatabaseShardingAlgorithm;
import com.dangdang.ddframe.rdb.sharding.example.jdbc.masterslave.algorithm.ModuloTableShardingAlgorithm;
import com.dangdang.ddframe.rdb.sharding.jdbc.core.datasource.ShardingDataSource;
import org.apache.commons.dbcp.BasicDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public final class Main {
    
    // CHECKSTYLE:OFF
    public static void main(final String[] args) throws SQLException {
    // CHECKSTYLE:ON
        DataSource dataSource = getShardingDataSource();
        printSimpleSelect(dataSource);
        System.out.println("--------------");
        printGroupBy(dataSource);
        System.out.println("--------------");
        printHintSimpleSelect(dataSource);
    }
    
    private static void printSimpleSelect(final DataSource dataSource) throws SQLException {
        String sql = "SELECT i.* FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id WHERE o.user_id=? AND o.order_id=?";
        try (
                Connection conn = dataSource.getConnection();
                PreparedStatement preparedStatement = conn.prepareStatement(sql)) {
            preparedStatement.setInt(1, 10);
            preparedStatement.setInt(2, 1001);
            try (ResultSet rs = preparedStatement.executeQuery()) {
                while (rs.next()) {
                    System.out.println(rs.getInt(1));
                    System.out.println(rs.getInt(2));
                    System.out.println(rs.getInt(3));
                }
            }
        }
    }
    
    private static void printGroupBy(final DataSource dataSource) throws SQLException {
        String sql = "SELECT o.user_id, COUNT(*) FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id GROUP BY o.user_id";
        try (
                Connection conn = dataSource.getConnection();
                PreparedStatement preparedStatement = conn.prepareStatement(sql)
                ) {
            ResultSet rs = preparedStatement.executeQuery();
            while (rs.next()) {
                System.out.println("user_id: " + rs.getInt(1) + ", count: " + rs.getInt(2));
            }
        }
    }
    
    private static void printHintSimpleSelect(final DataSource dataSource) throws SQLException {
        String sql = "SELECT i.* FROM t_order o JOIN t_order_item i ON o.order_id=i.order_id";
        try (
                HintManager hintManager = HintManager.getInstance();
                Connection conn = dataSource.getConnection();
                PreparedStatement preparedStatement = conn.prepareStatement(sql)) {
            hintManager.addDatabaseShardingValue("t_order", "user_id", 10);
            hintManager.addTableShardingValue("t_order", "order_id", 1001);
            try (ResultSet rs = preparedStatement.executeQuery()) {
                while (rs.next()) {
                    System.out.println(rs.getInt(1));
                    System.out.println(rs.getInt(2));
                    System.out.println(rs.getInt(3));
                }
            }
        }
    }
    
    private static ShardingDataSource getShardingDataSource() {
        DataSourceRule dataSourceRule = new DataSourceRule(createDataSourceMap());
        TableRule orderTableRule = TableRule.builder("t_order").actualTables(Arrays.asList("t_order_0", "t_order_1")).dataSourceRule(dataSourceRule).build();
        TableRule orderItemTableRule = TableRule.builder("t_order_item").actualTables(Arrays.asList("t_order_item_0", "t_order_item_1")).dataSourceRule(dataSourceRule).build();
        ShardingRule shardingRule = ShardingRule.builder().dataSourceRule(dataSourceRule).tableRules(Arrays.asList(orderTableRule, orderItemTableRule))
                .bindingTableRules(Collections.singletonList(new BindingTableRule(Arrays.asList(orderTableRule, orderItemTableRule))))
                .databaseShardingStrategy(new DatabaseShardingStrategy("user_id", new ModuloDatabaseShardingAlgorithm()))
                .tableShardingStrategy(new TableShardingStrategy("order_id", new ModuloTableShardingAlgorithm())).build();
        return new ShardingDataSource(shardingRule);
    }
    
    private static Map<String, DataSource> createDataSourceMap() {
        Map<String, DataSource> result = new HashMap<>(2);
        result.put("ds_0", MasterSlaveDataSourceFactory.createDataSource("ds_0", createDataSource("ds_0_master"), createDataSource("ds_0_slave_0"), createDataSource("ds_0_slave_1")));
        result.put("ds_1", MasterSlaveDataSourceFactory.createDataSource("ds_1", createDataSource("ds_1_master"), createDataSource("ds_1_slave_0"), createDataSource("ds_1_slave_1")));
        return result;
    }
    
    private static DataSource createDataSource(final String dataSourceName) {
        BasicDataSource result = new BasicDataSource();
        result.setDriverClassName(com.mysql.jdbc.Driver.class.getName());
        result.setUrl(String.format("jdbc:mysql://localhost:3306/%s", dataSourceName));
        result.setUsername("root");
        result.setPassword("");
        return result;
    }
}