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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.beam.sdk.extensions.sql.impl.parser;
  
  import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull;
  import static org.apache.beam.sdk.util.Preconditions.checkStateNotNull;
  import static org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Static.RESOURCE;
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.sdk.extensions.sql.impl.CatalogManagerSchema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.jdbc.CalcitePrepare;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.jdbc.CalciteSchema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.Schema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlCreate;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlIdentifier;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlKind;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlNodeList;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlSpecialOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlUtil;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlWriter;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Pair;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  public class SqlCreateCatalog extends SqlCreate implements BeamSqlParser.ExecutableStatement {
    private final SqlIdentifier catalogName;
    private final SqlNode type;
    private final SqlNodeList properties;
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("CREATE CATALOG", SqlKind.OTHER_DDL);
  
    public SqlCreateCatalog(
        SqlParserPos pos,
        boolean replace,
        boolean ifNotExists,
        SqlNode catalogName,
        SqlNode type,
        SqlNodeList properties) {
      super(OPERATOR, pos, replace, ifNotExists);
      this.catalogName = SqlDdlNodes.getIdentifier(catalogName, pos);
      this.type = checkArgumentNotNull(type, "Need to specify a TYPE for catalog '%s'", catalogName);
      this.properties = properties;
    }
  
    @Override
    public List<SqlNode> getOperandList() {
      ImmutableList.Builder<SqlNode> operands = ImmutableList.builder();
      operands.add(catalogName);
      operands.add(type);
      if (properties != null) {
        operands.add(properties);
      }
      return operands.build();
    }
  
    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      writer.keyword("CREATE");
      if (getReplace()) {
        writer.keyword("OR REPLACE");
      }
      writer.keyword("CATALOG");
      if (ifNotExists) {
        writer.keyword("IF NOT EXISTS");
      }
      catalogName.unparse(writer, leftPrec, rightPrec);
      writer.keyword("TYPE");
      type.unparse(writer, leftPrec, rightPrec);
      if (properties != null && !properties.isEmpty()) {
        writer.keyword("PROPERTIES");
        writer.keyword("(");
        for (int i = 0; i < properties.size(); i++) {
          if (i > 0) {
            writer.keyword(",");
          }
          SqlNode property = properties.get(i);
          checkState(
              property instanceof SqlNodeList,
              String.format(
                  "Unexpected properties entry '%s' of class '%s'", property, property.getClass()));
          SqlNodeList kv = ((SqlNodeList) property);
  
          kv.get(0).unparse(writer, leftPrec, rightPrec); // key
          writer.keyword("=");
          kv.get(1).unparse(writer, leftPrec, rightPrec); // value
        }
        writer.keyword(")");
      }
    }
  
    @Override
    public void execute(CalcitePrepare.Context context) {
      final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, catalogName);
      Schema schema = pair.left.schema;
      String typeStr = checkArgumentNotNull(SqlDdlNodes.getString(type));
  
      if (!(schema instanceof CatalogManagerSchema)) {
        throw SqlUtil.newContextException(
            catalogName.getParserPosition(),
            RESOURCE.internal(
                "Attempting to create catalog '"
                    + SqlDdlNodes.name(catalogName)
                    + "' with unexpected Calcite Schema of type "
                    + schema.getClass()));
      }
  
      ((CatalogManagerSchema) schema)
          .createCatalog(catalogName, typeStr, parseProperties(), getReplace(), ifNotExists);
    }
  
    private Map<String, String> parseProperties() {
      if (properties == null || properties.isEmpty()) {
        return Collections.emptyMap();
      }
  
      Map<String, String> props = new HashMap<>();
  
      for (SqlNode property : properties) {
        checkState(
            property instanceof SqlNodeList,
            String.format(
                "Unexpected properties entry '%s' of class '%s'", property, property.getClass()));
        SqlNodeList kv = ((SqlNodeList) property);
        checkState(kv.size() == 2, "Expected 2 items in properties entry, but got %s", kv.size());
        String key = checkStateNotNull(SqlDdlNodes.getString(kv.get(0)));
        String value = checkStateNotNull(SqlDdlNodes.getString(kv.get(1)));
        props.put(key, value);
      }
  
      return props;
    }
  }
  