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/*
 * 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 org.apache.hive.service.cli.operation;

import static org.apache.hadoop.hive.conf.Constants.MODE;
import static org.apache.hive.service.cli.operation.hplsql.HplSqlQueryExecutor.HPLSQL;
import static org.apache.hive.service.cli.operation.hplsql.HplSqlQueryExecutor.QUERY_EXECUTOR;

import java.sql.SQLException;
import java.util.Map;

import org.apache.hive.service.cli.operation.hplsql.BeelineConsole;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.processors.CommandProcessor;
import org.apache.hadoop.hive.ql.processors.CommandProcessorFactory;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hive.common.util.HiveStringUtils;
import org.apache.hive.hplsql.Conf;
import org.apache.hive.hplsql.Exec;
import org.apache.hive.hplsql.HplSqlSessionState;
import org.apache.hive.hplsql.ResultListener;
import org.apache.hive.hplsql.udf.Udf;
import org.apache.hive.service.cli.HiveSQLException;
import org.apache.hive.service.cli.OperationType;
import org.apache.hive.service.cli.operation.hplsql.BeelineConsole;
import org.apache.hive.service.cli.operation.hplsql.HplSqlOperation;
import org.apache.hive.service.cli.operation.hplsql.HplSqlQueryExecutor;
import org.apache.hive.service.cli.session.HiveSession;

public abstract class ExecuteStatementOperation extends Operation {
  protected String statement = null;

  public ExecuteStatementOperation(HiveSession parentSession, String statement,
      Map confOverlay) {
    super(parentSession, confOverlay, OperationType.EXECUTE_STATEMENT);
    this.statement = statement;
  }

  public ExecuteStatementOperation(HiveSession parentSession, String statement, Map confOverlay, boolean runInBackground, boolean generateNewQueryId) {
    super(parentSession, confOverlay, OperationType.EXECUTE_STATEMENT, generateNewQueryId);
    this.statement = statement;
  }

  public String getStatement() {
    return statement;
  }

  public static ExecuteStatementOperation newExecuteStatementOperation(HiveSession parentSession,
      String statement, Map confOverlay, boolean runAsync, long queryTimeout)
      throws HiveSQLException {

    String cleanStatement = HiveStringUtils.removeComments(statement);
    if (proceduralMode(confOverlay) && hplSqlMode()) {
      if (SessionState.get().getDynamicVar(Exec.class) == null) {
        Exec interpreter = new Exec(
                new Conf(),
                new BeelineConsole(),
                new HplSqlQueryExecutor(parentSession),
                parentSession.getMetaStoreClient(),
                new HiveHplSqlSessionState(SessionState.get())
        );
        interpreter.init();
        registerUdf();
        SessionState.get().addDynamicVar(interpreter);
      }
      return new HplSqlOperation(parentSession, statement, confOverlay, runAsync, SessionState.get().getDynamicVar(Exec.class));
    }

    String[] tokens = cleanStatement.trim().split("\\s+");
    CommandProcessor processor = null;
    try {
      processor = CommandProcessorFactory.getForHiveCommand(tokens, parentSession.getHiveConf());
    } catch (SQLException e) {
      throw new HiveSQLException(e.getMessage(), e.getSQLState(), e);
    }
    if (processor == null) {
      // runAsync, queryTimeout makes sense only for a SQLOperation
      // Pass the original statement to SQLOperation as sql parser can remove comments by itself
      return new SQLOperation(parentSession, statement, confOverlay, runAsync, queryTimeout, hplSqlMode());
    }
    return new HiveCommandOperation(parentSession, cleanStatement, processor, confOverlay);
  }

  private static void registerUdf() throws HiveSQLException {
    try {
      if (FunctionRegistry.getTemporaryFunctionInfo(Udf.NAME) == null) {
        FunctionRegistry.registerTemporaryUDF(Udf.NAME, org.apache.hive.hplsql.udf.Udf.class);
      }
    } catch (SemanticException e) {
      throw new HiveSQLException(e);
    }
  }

  private static boolean proceduralMode(Map confOverlay) {
    return confOverlay != null && !HPLSQL.equals(confOverlay.get(QUERY_EXECUTOR));
  }

  public static boolean hplSqlMode() {
    return HPLSQL.equalsIgnoreCase(SessionState.get().getHiveVariables().getOrDefault(MODE, ""));
  }

  private static class HiveHplSqlSessionState implements HplSqlSessionState {
    private final SessionState sessionState;

    public HiveHplSqlSessionState(SessionState sessionState) {
      this.sessionState = sessionState;
    }

    @Override
    public String currentUser() {
      return sessionState.getUserName();
    }

    @Override
    public String currentDatabase() {
      return sessionState.getCurrentDatabase();
    }

    @Override
    public String currentCatalog() {
      return sessionState.getCurrentCatalog();
    }
  }
}