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package com.adobe.aem.wknd.examples.core.connections.impl;

import com.adobe.aem.wknd.examples.core.connections.ExternalService;
import com.day.commons.datasource.poolservice.DataSourceNotFoundException;
import com.day.commons.datasource.poolservice.DataSourcePool;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

@Component
public class JdbcExternalServiceImpl implements ExternalService {
    private static final Logger log = LoggerFactory.getLogger(JdbcExternalServiceImpl.class);

    @Reference
    private DataSourcePool dataSourcePool;

    // The datasource.name value of the OSGi configuration containing the connection this OSGi component will use.
    private static final String DATA_SOURCE_NAME = "wknd-examples-mysql";

    @Override
    public boolean isAccessible() {

        try {
            // Get the JDBC data source based on the named OSGi configuration
            DataSource dataSource = (DataSource) dataSourcePool.getDataSource(DATA_SOURCE_NAME);

            // Establish a connection with the external JDBC service
            // Per the OSGi configuration, this will use the injected $[env:AEM_PROXY_HOST] value as the host
            // and the port (30001) mapped via Cloud Manager API call
            try (Connection connection = dataSource.getConnection()) {

                // Validate the connection
                connection.isValid(1000);

                // Close the connection, since this is just a simple connectivity check
                connection.close();

                // Return true if AEM could reach the external JDBC service
                return true;
            } catch (SQLException e) {
                log.error("Unable to validate SQL connection for [ {} ]", DATA_SOURCE_NAME, e);
            }
        } catch (DataSourceNotFoundException e) {
            log.error("Unable to establish an connection with the JDBC data source [ {} ]", DATA_SOURCE_NAME, e);
        }

        return false;
    }
}