/*
 *
 *  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 com.dlink.app.flinksql;

import com.dlink.app.db.DBConfig;
import com.dlink.app.db.DBUtil;
import com.dlink.assertion.Asserts;
import com.dlink.constant.FlinkSQLConstant;
import com.dlink.executor.Executor;
import com.dlink.executor.ExecutorSetting;
import com.dlink.interceptor.FlinkInterceptor;
import com.dlink.parser.SqlType;
import com.dlink.trans.Operations;
import com.dlink.utils.SqlUtil;

import org.apache.flink.configuration.CheckpointingOptions;

import java.io.IOException;
import java.sql.SQLException;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * FlinkSQLFactory
 *
 * @author wenmo
 * @since 2021/10/27
 **/
public class Submiter {
    private static final Logger logger = LoggerFactory.getLogger(Submiter.class);

    private static String getQuerySQL(Integer id) throws SQLException {
        if (id == null) {
            throw new SQLException("请指定任务ID");
        }
        return "select statement from dlink_task_statement where id = " + id;
    }

    private static String getTaskInfo(Integer id) throws SQLException {
        if (id == null) {
            throw new SQLException("请指定任务ID");
        }
        return "select id, name, alias as jobName, type,check_point as checkpoint,"
            + "save_point_path as savePointPath, parallelism,fragment as useSqlFragment,statement_set as useStatementSet,config_json as config,"
            + " env_id as envId,batch_model AS useBatchModel from dlink_task where id = " + id;
    }

    private static String getFlinkSQLStatement(Integer id, DBConfig config) {
        String statement = "";
        try {
            statement = DBUtil.getOneByID(getQuerySQL(id), config);
        } catch (IOException | SQLException e) {
            logger.error("{} --> 获取 FlinkSQL 配置异常，ID 为 {}, 连接信息为：{} ,异常信息为：{} ", LocalDateTime.now(), id, config.toString(), e.getMessage(), e);
        }
        return statement;
    }

    public static Map<String, String> getTaskConfig(Integer id, DBConfig config) {
        Map<String, String> task = new HashMap<>();
        try {
            task = DBUtil.getMapByID(getTaskInfo(id), config);
        } catch (IOException | SQLException e) {
            logger.error("{} --> 获取 FlinkSQL 配置异常，ID 为 {}, 连接信息为：{} ,异常信息为：{} ", LocalDateTime.now(), id, config.toString(), e.getMessage(), e);
        }
        return task;
    }

    public static List<String> getStatements(String sql) {
        return Arrays.asList(SqlUtil.getStatements(sql));
    }

    public static void submit(Integer id, DBConfig dbConfig) {
        logger.info(LocalDateTime.now() + "开始提交作业 -- " + id);
        StringBuilder sb = new StringBuilder();
        Map<String, String> taskConfig = Submiter.getTaskConfig(id, dbConfig);
        if (Asserts.isNotNull(taskConfig.get("envId"))) {
            String envId = getFlinkSQLStatement(Integer.valueOf(taskConfig.get("envId")), dbConfig);
            if (Asserts.isNotNullString(envId)) {
                sb.append(envId);
            }
            sb.append("\n");
        }
        sb.append(getFlinkSQLStatement(id, dbConfig));
        List<String> statements = Submiter.getStatements(sb.toString());
        ExecutorSetting executorSetting = ExecutorSetting.build(taskConfig);
        String uuid = UUID.randomUUID().toString().replace("-", "");
        if (executorSetting.getConfig().containsKey(CheckpointingOptions.CHECKPOINTS_DIRECTORY.key())) {
            executorSetting.getConfig().put(CheckpointingOptions.CHECKPOINTS_DIRECTORY.key(),
                executorSetting.getConfig().get(CheckpointingOptions.CHECKPOINTS_DIRECTORY.key()) + "/" + uuid);
        }
        if (executorSetting.getConfig().containsKey(CheckpointingOptions.SAVEPOINT_DIRECTORY.key())) {
            executorSetting.getConfig().put(CheckpointingOptions.SAVEPOINT_DIRECTORY.key(),
                executorSetting.getConfig().get(CheckpointingOptions.SAVEPOINT_DIRECTORY.key()) + "/" + uuid);
        }
        logger.info("作业配置如下： {}", executorSetting);
        Executor executor = Executor.buildAppStreamExecutor(executorSetting);
        List<StatementParam> ddl = new ArrayList<>();
        List<StatementParam> trans = new ArrayList<>();
        List<StatementParam> execute = new ArrayList<>();
        for (String item : statements) {
            String statement = FlinkInterceptor.pretreatStatement(executor, item);
            if (statement.isEmpty()) {
                continue;
            }
            SqlType operationType = Operations.getOperationType(statement);
            if (operationType.equals(SqlType.INSERT) || operationType.equals(SqlType.SELECT)) {
                trans.add(new StatementParam(statement, operationType));
                if (!executorSetting.isUseStatementSet()) {
                    break;
                }
            } else if (operationType.equals(SqlType.EXECUTE)) {
                execute.add(new StatementParam(statement, operationType));
                if (!executorSetting.isUseStatementSet()) {
                    break;
                }
            } else {
                ddl.add(new StatementParam(statement, operationType));
            }
        }
        for (StatementParam item : ddl) {
            logger.info("正在执行 FlinkSQL： " + item.getValue());
            executor.submitSql(item.getValue());
            logger.info("执行成功");
        }
        if (trans.size() > 0) {
            if (executorSetting.isUseStatementSet()) {
                List<String> inserts = new ArrayList<>();
                for (StatementParam item : trans) {
                    if (item.getType().equals(SqlType.INSERT)) {
                        inserts.add(item.getValue());
                    }
                }
                logger.info("正在执行 FlinkSQL 语句集： " + String.join(FlinkSQLConstant.SEPARATOR, inserts));
                executor.submitStatementSet(inserts);
                logger.info("执行成功");
            } else {
                for (StatementParam item : trans) {
                    logger.info("正在执行 FlinkSQL： " + item.getValue());
                    executor.submitSql(item.getValue());
                    logger.info("执行成功");
                    break;
                }
            }
        }
        if (execute.size() > 0) {
            List<String> executes = new ArrayList<>();
            for (StatementParam item : execute) {
                executes.add(item.getValue());
                executor.executeSql(item.getValue());
                if (!executorSetting.isUseStatementSet()) {
                    break;
                }
            }
            logger.info("正在执行 FlinkSQL 语句集： " + String.join(FlinkSQLConstant.SEPARATOR, executes));
            try {
                executor.execute(executorSetting.getJobName());
                logger.info("执行成功");
            } catch (Exception e) {
                logger.error("执行失败, {}", e.getMessage(), e);
            }
        }
        logger.info("{}任务提交成功",LocalDateTime.now());
    }
}
