/*
 * This file is part of Bitsquare.
 *
 * Bitsquare is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * Bitsquare is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Bitsquare. If not, see <http://www.gnu.org/licenses/>.
 */

package io.bitsquare.app;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.core.rolling.FixedWindowRollingPolicy;
import ch.qos.logback.core.rolling.RollingFileAppender;
import ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy;
import ch.qos.logback.core.util.FileSize;
import io.bitsquare.common.util.Profiler;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.Date;

public class Log {
    private static SizeBasedTriggeringPolicy triggeringPolicy;
    private static Logger logbackLogger;

    public static void setLevel(Level logLevel) {
        logbackLogger.setLevel(logLevel);
    }

    public static void setup(String fileName) {
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();

        RollingFileAppender appender = new RollingFileAppender();
        appender.setContext(loggerContext);
        appender.setFile(fileName + ".log");

        FixedWindowRollingPolicy rollingPolicy = new FixedWindowRollingPolicy();
        rollingPolicy.setContext(loggerContext);
        rollingPolicy.setParent(appender);
        rollingPolicy.setFileNamePattern(fileName + "_%i.log");
        rollingPolicy.setMinIndex(1);
        rollingPolicy.setMaxIndex(10);
        rollingPolicy.start();

        triggeringPolicy = new SizeBasedTriggeringPolicy();
        triggeringPolicy.setMaxFileSize(FileSize.valueOf("10MB"));
        triggeringPolicy.start();

        PatternLayoutEncoder encoder = new PatternLayoutEncoder();
        encoder.setContext(loggerContext);
        encoder.setPattern("%d{MMM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{15}: %msg %xEx%n");
        encoder.start();

        appender.setEncoder(encoder);
        appender.setRollingPolicy(rollingPolicy);
        appender.setTriggeringPolicy(triggeringPolicy);
        appender.start();

        logbackLogger = loggerContext.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
        logbackLogger.addAppender(appender);
        logbackLogger.setLevel(Level.INFO);

        // log errors in separate file
        // not working as expected still.... damn logback...
       /* FileAppender errorAppender = new FileAppender();
        errorAppender.setEncoder(encoder);
        errorAppender.setName("Error");
        errorAppender.setContext(loggerContext);
        errorAppender.setFile(fileName + "_error.log");
        LevelFilter levelFilter = new LevelFilter();
        levelFilter.setLevel(Level.ERROR);
        levelFilter.setOnMatch(FilterReply.ACCEPT);
        levelFilter.setOnMismatch(FilterReply.DENY);
        levelFilter.start();
        errorAppender.addFilter(levelFilter);
        errorAppender.start();
        logbackLogger.addAppender(errorAppender);*/
    }

    public static void traceCall() {
        if (LoggerFactory.getLogger(Log.class).isTraceEnabled()) {
            StackTraceElement stackTraceElement = new Throwable().getStackTrace()[1];
            String methodName = stackTraceElement.getMethodName();
            if (methodName.equals("<init>"))
                methodName = "Constructor ";
            String className = stackTraceElement.getClassName();
            LoggerFactory.getLogger(className).trace("Called: {}", methodName);
        }
    }

    public static void traceCall(String message) {
        if (LoggerFactory.getLogger(Log.class).isTraceEnabled()) {
            StackTraceElement stackTraceElement = new Throwable().getStackTrace()[1];
            String methodName = stackTraceElement.getMethodName();
            if (methodName.equals("<init>"))
                methodName = "Constructor ";
            String className = stackTraceElement.getClassName();
            LoggerFactory.getLogger(className).trace("Called: {} [{}]", methodName, message);
        }
    }

    public static void logIfStressTests(String msg) {
        if (DevFlags.STRESS_TEST_MODE)
            System.err.println(new SimpleDateFormat("HH:mm:ss.SSS").format(new Date()) +
                    " - " + msg +
                    " / Memory(MB): " + Profiler.getUsedMemoryInMB());
    }
}