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/*
 * Copyright Debezium Authors.
 *
 * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package io.debezium.connector.mysql;

import java.util.function.Function;

import org.apache.kafka.connect.source.SourceRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.debezium.DebeziumException;
import io.debezium.connector.binlog.BinlogConnectorConfig;
import io.debezium.connector.binlog.BinlogSnapshotChangeEventSource;
import io.debezium.connector.binlog.jdbc.BinlogConnectorConnection;
import io.debezium.connector.mysql.MySqlOffsetContext.Loader;
import io.debezium.function.BlockingConsumer;
import io.debezium.jdbc.MainConnectionProvidingConnectionFactory;
import io.debezium.pipeline.EventDispatcher;
import io.debezium.pipeline.notification.NotificationService;
import io.debezium.relational.TableId;
import io.debezium.snapshot.SnapshotterService;
import io.debezium.util.Clock;

public class MySqlSnapshotChangeEventSource extends BinlogSnapshotChangeEventSource {

    private static final Logger LOGGER = LoggerFactory.getLogger(MySqlSnapshotChangeEventSource.class);

    private final MySqlConnectorConfig connectorConfig;

    public MySqlSnapshotChangeEventSource(MySqlConnectorConfig connectorConfig,
                                          MainConnectionProvidingConnectionFactory connectionFactory,
                                          MySqlDatabaseSchema schema,
                                          EventDispatcher dispatcher,
                                          Clock clock,
                                          MySqlSnapshotChangeEventSourceMetrics metrics,
                                          BlockingConsumer> lastEventProcessor,
                                          Runnable preSnapshotAction,
                                          NotificationService notificationService,
                                          SnapshotterService snapshotterService) {
        super(connectorConfig, connectionFactory, schema, dispatcher, clock, metrics, lastEventProcessor,
                preSnapshotAction, notificationService, snapshotterService);
        this.connectorConfig = connectorConfig;
    }

    @Override
    protected MySqlOffsetContext getInitialOffsetContext(BinlogConnectorConfig connectorConfig) {
        return MySqlOffsetContext.initial((MySqlConnectorConfig) connectorConfig);
    }

    @Override
    protected void setOffsetContextBinlogPositionAndGtidDetailsForSnapshot(MySqlOffsetContext offsetContext,
                                                                           BinlogConnectorConnection connection,
                                                                           SnapshotterService snapshotterService)
            throws Exception {
        LOGGER.info("Read binlog position of MySQL primary server");
        final String showMasterStmt = "SHOW MASTER STATUS";
        connection.query(showMasterStmt, rs -> {
            if (rs.next()) {
                final String binlogFilename = rs.getString(1);
                final long binlogPosition = rs.getLong(2);
                offsetContext.setBinlogStartPoint(binlogFilename, binlogPosition);
                if (rs.getMetaData().getColumnCount() > 4) {
                    // This column exists only in MySQL 5.6.5 or later ...
                    final String gtidSet = rs.getString(5); // GTID set, may be null, blank, or contain a GTID set
                    offsetContext.setCompletedGtidSet(gtidSet);
                    LOGGER.info("\t using binlog '{}' at position '{}' and gtid '{}'", binlogFilename, binlogPosition,
                            gtidSet);
                }
            }
            else if (!snapshotterService.getSnapshotter().shouldStream()) {
                LOGGER.warn("Failed retrieving binlog position, continuing as streaming CDC wasn't requested");
            }
            else {
                throw new DebeziumException("Cannot read the binlog filename and position via '" + showMasterStmt
                        + "'. Make sure your server is correctly configured");
            }
        });
    }

    @Override
    protected MySqlOffsetContext copyOffset(RelationalSnapshotContext snapshotContext) {
        return new Loader(connectorConfig).load(snapshotContext.offset.getOffset());
    }
}