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// 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
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// KIND, either express or implied.  See the License for the
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package org.apache.doris.analysis;

import org.apache.doris.catalog.Catalog;
import org.apache.doris.catalog.Column;
import org.apache.doris.catalog.ScalarType;
import org.apache.doris.common.AnalysisException;
import org.apache.doris.common.ErrorCode;
import org.apache.doris.common.ErrorReport;
import org.apache.doris.common.proc.BackendsProcDir;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.ShowResultSetMetaData;

public class ShowBackendsStmt extends ShowStmt {

    public ShowBackendsStmt() {  
    }
    
    @Override
    public void analyze(Analyzer analyzer) throws AnalysisException {
        if (!Catalog.getCurrentCatalog().getAuth().checkGlobalPriv(ConnectContext.get(), PrivPredicate.ADMIN)
                && !Catalog.getCurrentCatalog().getAuth().checkGlobalPriv(ConnectContext.get(),
                                                                          PrivPredicate.OPERATOR)) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR, "ADMIN/OPERATOR");
        }
    }

    @Override
    public ShowResultSetMetaData getMetaData() {
         ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();
         for (String title : BackendsProcDir.TITLE_NAMES) {
            // hide hostname for SHOW BACKENDS stmt
            if (title.equals("HostName")) {
                 continue;
             }
            builder.addColumn(new Column(title, ScalarType.createVarchar(30)));
        }
        return builder.build();
    }
}

