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/*
 License:

 blueprint-sdk is licensed under the terms of Eclipse Public License(EPL) v1.0
 (http://www.eclipse.org/legal/epl-v10.html)


 Distribution:

 Maven Central - https://search.maven.org/artifact/io.github.lempel/blueprint-sdk
 MVN Repository - https://mvnrepository.com/artifact/io.github.lempel/blueprint-sdk
 */

package blueprint.sdk.google.gcm.spool;

import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import blueprint.sdk.google.gcm.GcmResponseDetail;
import blueprint.sdk.util.Validator;

/**
 * Rolls error log into separate files hourly.
 *
 * @author [email protected]
 * @since 2013. 12. 11.
 * @deprecated GCM is replaced by FCM - https://firebase.google.com/docs/cloud-messaging
 */
@SuppressWarnings("WeakerAccess")
public class RollingFileHandler extends GcmErrorHandler {
    private static final Logger L = LoggerFactory.getLogger(RollingFileHandler.class);

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd-HH");
    private static final long HOUR = 60 * 60 * 1000;

    private static final String errorPath;
    private static PrintWriter errorLog;
    private static long timestamp;

    static {
        errorPath = System.getProperty("GCM_ERROR_PATH");
        if (Validator.isEmpty(errorPath)) {
            L.error("Environment GCM_ERROR_PATH is not set");
        } else {
            createErrorLog();
        }
    }

    private static void createErrorLog() {
        if (errorLog != null) {
            errorLog.close();
        }

        try {
            timestamp = System.currentTimeMillis();
            errorLog = new PrintWriter(new FileWriter(errorPath + "/" + "gcm_error_" + dateFormat.format(new Date())
                    + ".txt", true));
        } catch (IOException e) {
            L.error("Can't create appender for error log", e);
        }
    }

    private static void rollErrorLog() {
        if (System.currentTimeMillis() > timestamp + HOUR) {
            createErrorLog();
        }
    }

    private void logError(String message) {
        synchronized (GcmErrorHandler.class) {
            rollErrorLog();
            errorLog.println(message);
            errorLog.flush();
        }
    }

    @Override
    protected void logGcmError(String regId, GcmResponseDetail detail) {
        logError("{ \"registration_id\": \"" + regId + "\", \"gcm_error\": \"" + detail.message + "\" }");
    }

    @Override
    protected void logIoError(IOException exIo, String regId) {
        logError("{ \"registration_id\": \"" + regId + "\", \"io_error\": \"" + exIo.getMessage() + "\" }");
    }
}