package com.lunhan.xxx.host;

import com.lunhan.xxx.common.util.ListUtil;
import com.lunhan.xxx.common.util.SerializeUtil;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import java.util.Objects;

public class Mysql2Gauss {
    private static final String Mysql_HOST = "113.250.189.120";
    private static final String Mysql_PORT = "23306";
    private static final String Mysql_USER = "lunhan";
    private static final String Mysql_PASSWORD = "lunhan123";
    private static final String Mysql_DB_NAME = "water_basic";
    private static final String Mysql_DRIVER = "com.mysql.cj.jdbc.Driver";
    private static final String Mysql_CONNECTION_STR = "jdbc:mysql://" + Mysql_HOST + ":" + Mysql_PORT + "/" + Mysql_DB_NAME + "?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false";

    private static final String Gauss_HOST = "113.250.189.120";
    private static final String Gauss_PORT = "57654";
    private static final String Gauss_USER = "lunhan";
    private static final String Gauss_PASSWORD = "lunhan.20240330";
    private static final String Gauss_DB_NAME = "water_basic";
    private static final String Gauss_DRIVER = "org.postgresql.Driver";
    private static final String Gauss_CONNECTION_STR = "jdbc:postgresql://" + Gauss_HOST + ":" + Gauss_PORT + "/" + Gauss_DB_NAME;

    private static Connection CONN_Mysql = null;
    private static Connection CONN_Gauss = null;

    static {
        //加载驱动
        try {
            Class.forName(Mysql_DRIVER);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        //获得连接
        try {
            CONN_Mysql = DriverManager.getConnection(Mysql_CONNECTION_STR, Mysql_USER, Mysql_PASSWORD);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //加载驱动
        try {
            Class.forName(Gauss_DRIVER);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        //获得连接
        try {
            CONN_Gauss = DriverManager.getConnection(Gauss_CONNECTION_STR, Gauss_USER, Gauss_PASSWORD);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws SQLException {
        // 创建触发器需要的函数
        GenCodeGauss.execSql(CONN_Gauss, "CREATE OR REPLACE FUNCTION \"public\".\"update_timestamp_column\"()\n" +
                "  RETURNS \"pg_catalog\".\"trigger\" AS $BODY$\n" +
                "BEGIN\n" +
                "NEW.timestamp_column := current_timestamp;\n" +
                "RETURN NEW;\n" +
                "END;\n" +
                "$BODY$\n" +
                "  LANGUAGE plpgsql VOLATILE\n" +
                "  COST 100");

        // 获取mysql所有的表名称
        Map<String, String> tables = GenCodeMysql.getTables(CONN_Mysql, Mysql_DB_NAME);
        // 遍历表名，获取表结构
        for (Map.Entry<String, String> table : tables.entrySet()) {
            // 获取mysql表结构
            List<Map<String, Object>> columns = GenCodeMysql.getColumns(CONN_Mysql, table.getKey(), Mysql_DB_NAME);
            // 获取mysql表的主键
            Map<String, String> mapPK = GenCodeMysql.getPK(CONN_Mysql, table.getKey());
            // 获取mysql表的索引
            Map<String, String> mapIndex = GenCodeMysql.getIndex(CONN_Mysql, table.getKey());

            System.out.println("从mysql查询表结构：" + table.getKey());
            // 调用gauss创建表结构
            boolean genTale = GenCodeGauss.genTable(CONN_Gauss, table.getKey(), table.getValue(), columns, mapPK, mapIndex);
            System.out.println("向gauss数据库创建表结果：" + genTale);

            // 获取mysql表所有数据
            String sqlSelect = "SELECT * FROM " + Mysql_DB_NAME + "." + table.getKey();
            Integer count = 1;
            Integer pageSize = 1;
            String orderBy = "id";
            Object lastId = null;
            while (count > 0) {
                count = 0;
                String sql = sqlSelect + (Objects.isNull(lastId) ? "" : " WHERE " + orderBy + " > " + GenCodeGauss.toDBValue(lastId) + "") + " ORDER BY " + orderBy + " LIMIT " + pageSize;
                List<Map<String, Object>> list = GenCodeMysql.getListAll(CONN_Mysql, sql);
                if (ListUtil.isNullOrEmpty(list)) {
                    continue;
                }
                count = list.size();
                lastId  = list.get(list.size() - 1).get(orderBy);

                System.out.println("从mysql获取到数据：" + count);
                // 批量插入gauss数据库
                List<Boolean> insertAll = GenCodeGauss.insertAll(CONN_Gauss, list, table.getKey(), pageSize);
                System.out.println("向gauss数据库插入数据结果：" + SerializeUtil.toJson(insertAll));
            }
        }
    }
}