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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2020 Payara Foundation and/or its affiliates. All rights reserved.
 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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package fish.payara.jdbc;

import org.glassfish.api.jdbc.SQLTraceListener;
import org.glassfish.api.jdbc.SQLTraceRecord;
import org.glassfish.api.jdbc.SQLTraceStore;
import org.glassfish.internal.api.Globals;

import com.sun.gjc.util.SQLTraceLogger;

/**
 * An adapter between the {@link SQLTraceListener} abstraction that is registered with implementation class as key and a
 * managed instance of the {@link SQLTraceStore}.
 * 
 * Even though this class is very similar to {@link SQLTraceLogger} the classes cannot share code as each has to have
 * its own {@link ThreadLocal}. Would they inherit from the same base class the invocations from both classes would get
 * mixed up in the same {@link ThreadLocal}.
 * 
 * @author Jan Bernitt
 */
public class SQLTraceStoreAdapter implements SQLTraceListener {

    private static ThreadLocal currentQuery = new ThreadLocal<>();

    private final SQLTraceStore store;

    public SQLTraceStoreAdapter() {
        this.store = Globals.getDefaultHabitat().getService(SQLTraceStore.class);
    }

    @Override
    public void sqlTrace(SQLTraceRecord record) {
        if (record != null) {
            switch (record.getMethodName()) {
            // these calls capture a query string
            case "nativeSQL":
            case "prepareCall":
            case "prepareStatement":
            case "addBatch":
                aquireSQL(record);
                break;
            // these can all run the SQL and contain SQL
            case "execute":
            case "executeQuery":
            case "executeUpdate":
                trace(record);
                break;
            default:
                // nothing
            }
        }
    }

    private void trace(SQLTraceRecord record) {
        SQLQuery query = aquireSQL(record);
        if (store != null) {
            store.trace(record, query.getSQL());
        }
        // clean the thread local
        currentQuery.set(null);
    }

    private static SQLQuery aquireSQL(SQLTraceRecord record) {
        // acquire the SQL
        SQLQuery query = currentQuery.get();
        if (query == null) {
            query = new SQLQuery();
            currentQuery.set(query);
        }
        // see if we have more SQL
        if (record.getParams() != null && record.getParams().length > 0) {
            // gather the SQL
            query.addSQL((String)record.getParams()[0]);
        }
        return query;
    }

}