/*
 * Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
 *
 * 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.
 */

package com.hazelcast.jet.sql.impl.parse;

import com.hazelcast.internal.util.Preconditions;
import org.apache.calcite.sql.SqlAlter;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.validate.SqlValidator;
import org.apache.calcite.sql.validate.SqlValidatorScope;
import org.apache.calcite.util.ImmutableNullableList;

import javax.annotation.Nonnull;
import java.util.List;

import static java.util.Objects.requireNonNull;

public class SqlAlterJob extends SqlAlter {

    private static final SqlSpecialOperator OPERATOR =
            new SqlSpecialOperator("ALTER JOB", SqlKind.OTHER_DDL);

    private final SqlIdentifier name;
    private final AlterJobOperation operation;

    public SqlAlterJob(SqlIdentifier name, AlterJobOperation operation, SqlParserPos pos) {
        super(pos, "JOB");

        this.name = requireNonNull(name, "Name must not be null");
        this.operation = requireNonNull(operation, "Operation must not be null");

        Preconditions.checkTrue(name.names.size() == 1, name.toString());
    }

    public String name() {
        return name.toString();
    }

    public AlterJobOperation getOperation() {
        return operation;
    }

    @Override @Nonnull
    public SqlOperator getOperator() {
        return OPERATOR;
    }

    @Override @Nonnull
    public List<SqlNode> getOperandList() {
        return ImmutableNullableList.of(name);
    }

    @Override
    protected void unparseAlterOperation(SqlWriter writer, int leftPrec, int rightPrec) {
        name.unparse(writer, leftPrec, rightPrec);
        writer.keyword(operation.name());
    }

    @Override
    public void validate(SqlValidator validator, SqlValidatorScope scope) {
    }

    public enum AlterJobOperation {
        SUSPEND,
        RESUME,
        RESTART
    }
}
