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// 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.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.ProcNodeInterface;
import org.apache.doris.common.proc.ProcResult;
import org.apache.doris.common.proc.ProcService;
import org.apache.doris.mysql.privilege.PrivPredicate;
import org.apache.doris.qe.ConnectContext;
import org.apache.doris.qe.ShowResultSetMetaData;

// SHOW PROC statement. Used to show proc information, only admin can use.
public class ShowProcStmt extends ShowStmt {
    private String path;
    private ProcNodeInterface node;

    public ShowProcStmt(String path) {
        this.path = path;
    }

    public ProcNodeInterface getNode() {
        return node;
    }

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

        node = ProcService.getInstance().open(path);
        if (node == null) {
            ErrorReport.reportAnalysisException(ErrorCode.ERR_WRONG_PROC_PATH, path);
        }
    }

    @Override
    public String toSql() {
        StringBuilder sb = new StringBuilder();
        sb.append("SHOW PROC '").append(path).append("'");
        return sb.toString();
    }

    @Override
    public ShowResultSetMetaData getMetaData() {
        ShowResultSetMetaData.Builder builder = ShowResultSetMetaData.builder();

        ProcResult result = null;
        try {
            result = node.fetchResult();
        } catch (AnalysisException e) {
            return builder.build();
        }

        for (String col : result.getColumnNames()) {
            builder.addColumn(new Column(col, ScalarType.createVarchar(30)));
        }
        return builder.build();
    }
}
