/*
 * 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.skywalking.oap.server.storage.plugin.jdbc.h2.dao;

import java.io.IOException;
import java.sql.*;
import org.apache.skywalking.oap.server.core.Const;
import org.apache.skywalking.oap.server.core.register.RegisterSource;
import org.apache.skywalking.oap.server.core.storage.*;
import org.apache.skywalking.oap.server.library.client.jdbc.JDBCClientException;
import org.apache.skywalking.oap.server.library.client.jdbc.hikaricp.JDBCHikariCPClient;

/**
 * @author wusheng
 */
public class H2RegisterDAO extends H2SQLExecutor implements IRegisterDAO {
    private final JDBCHikariCPClient h2Client;
    private final StorageBuilder<RegisterSource> storageBuilder;

    public H2RegisterDAO(JDBCHikariCPClient h2Client,
        StorageBuilder<RegisterSource> storageBuilder) {
        this.h2Client = h2Client;
        this.storageBuilder = storageBuilder;
    }

    @Override public int max(String modelName) throws IOException {
        Connection connection = null;
        try {
            connection = h2Client.getConnection();
            try (ResultSet rs = h2Client.executeQuery(connection, "SELECT max(sequence) max_id FROM " + modelName)) {
                while (rs.next()) {
                    int maxId = rs.getInt("max_id");
                    if (maxId == 0) {
                        return 1;
                    } else {
                        return maxId;
                    }
                }
            }
        } catch (SQLException e) {
            throw new IOException(e.getMessage(), e);
        } catch (JDBCClientException e) {
            throw new IOException(e.getMessage(), e);
        } finally {
            h2Client.close(connection);
        }
        return Const.NONE;
    }

    @Override public RegisterSource get(String modelName, String id) throws IOException {
        return (RegisterSource)getByID(h2Client, modelName, id, storageBuilder);
    }

    @Override public void forceInsert(String modelName, RegisterSource source) throws IOException {
        try (Connection connection = h2Client.getConnection()) {
            getInsertExecutor(modelName, source, storageBuilder).invoke(connection);
        } catch (SQLException e) {
            throw new IOException(e.getMessage(), e);
        } catch (JDBCClientException e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    @Override public void forceUpdate(String modelName, RegisterSource source) throws IOException {
        try (Connection connection = h2Client.getConnection()) {
            getUpdateExecutor(modelName, source, storageBuilder).invoke(connection);
        } catch (SQLException e) {
            throw new IOException(e.getMessage(), e);
        } catch (JDBCClientException e) {
            throw new IOException(e.getMessage(), e);
        }
    }
}
