package org.cef.misc;

import org.cef.CefSettings;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

// NOTE: java.util.Logger with FileHandler(CefSettings.log_file) doesn't work properly along with CEF-logging
// so use this separate primitive logger
// TODO: support log4j or similar
public class CefLog {
    private static final boolean TRACE_THREAD = Boolean.getBoolean("jcef.log.trace_thread");
    private static CefLog INSTANCE = new CefLog(System.err, Utils.getBoolean("jcef.log.verbose") ? CefSettings.LogSeverity.LOGSEVERITY_VERBOSE : CefSettings.LogSeverity.LOGSEVERITY_DISABLE);
    private static volatile boolean isInitialized = false;
    private static final SimpleDateFormat ourTimeFormat = new SimpleDateFormat("mm:ss:SSS");

    private String myFilePath;
    private PrintStream myPrintStream;
    private CefSettings.LogSeverity mySeverity;

    public static void initVerbose() {
        String log_file = Utils.getString("jcef.log.path");
        CefSettings.LogSeverity log_severity;
        String level = Utils.getString("jcef.log.level", "verbose").toLowerCase(Locale.ENGLISH);
        if (level.contains("dis"))
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_DISABLE;
        else if (level.contains("info"))
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_INFO;
        else if (level.contains("warn"))
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_WARNING;
        else if (level.contains("err"))
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_ERROR;
        else if (level.contains("fatal"))
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_FATAL;
        else
            log_severity = CefSettings.LogSeverity.LOGSEVERITY_VERBOSE;

        init(log_file, log_severity, false);
    }

    public static void init(String log_file, CefSettings.LogSeverity log_severity) {
        init(log_file, log_severity, false);
    }

    public static void init(String log_file, CefSettings.LogSeverity log_severity, boolean forceReinit) {
        if (isInitialized) {
            if (!forceReinit) {
                if (INSTANCE != null)
                    Log(CefSettings.LogSeverity.LOGSEVERITY_VERBOSE,"CefLog is already initialized (severity=%s, path='%s'), new settings (severity=%s, path='%s') will be ignored.",
                            INSTANCE.mySeverity, INSTANCE.myFilePath, log_severity, log_file);
                return;
            }
            System.out.println("Reinitialize CefLog.\n");
        }
        INSTANCE = null;
        isInitialized = true;

        if (log_severity == CefSettings.LogSeverity.LOGSEVERITY_DISABLE)
            return;

        CefSettings.LogSeverity severity = log_severity == null ? CefSettings.LogSeverity.LOGSEVERITY_INFO : log_severity;

        boolean useStdOut = false; // stderr isn't buffered
        if (log_file != null && !log_file.trim().isEmpty() && !log_file.trim().equalsIgnoreCase("null")) {
            useStdOut = log_file.trim().equalsIgnoreCase("stdout");
            if (!useStdOut) {
                if (log_severity != CefSettings.LogSeverity.LOGSEVERITY_DEFAULT) {
                    try {
                        System.out.printf("JCEF(%s): initialized file logger, severity=%s, path='%s'\n", ourTimeFormat.format(new Date()), severity, log_file);
                        PrintStream ps = new PrintStream(new FileOutputStream(log_file, true), true);
                        INSTANCE = new CefLog(ps, severity);
                        INSTANCE.myFilePath = log_file;
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                }
                return;
            }
        }

        System.out.printf("JCEF(%s): initialized %s logger, severity=%s\n", ourTimeFormat.format(new Date()), useStdOut ? "stdout" : "stderr", severity);
        INSTANCE = new CefLog(useStdOut ? System.out : System.err, severity);
    }

    private CefLog(PrintStream ps, CefSettings.LogSeverity log_severity) {
        myPrintStream = ps;
        mySeverity = log_severity;
    }

    private static String shortSeverity(CefSettings.LogSeverity log_severity) {
        switch (log_severity) {
            case LOGSEVERITY_DEFAULT:
                return "D";
            case LOGSEVERITY_VERBOSE:
                return "V";
            case LOGSEVERITY_INFO:
                return "I";
            case LOGSEVERITY_WARNING:
                return "W";
            case LOGSEVERITY_ERROR:
                return "E";
            case LOGSEVERITY_FATAL:
                return "F";
            case LOGSEVERITY_DISABLE:
                return "d";
        }
        return "";
    }

    public void debug(String msg) { log(CefSettings.LogSeverity.LOGSEVERITY_VERBOSE, msg); }
    public void info(String msg) { log(CefSettings.LogSeverity.LOGSEVERITY_INFO, msg); }
    public void warn(String msg) { log(CefSettings.LogSeverity.LOGSEVERITY_WARNING, msg); }
    public void error(String msg) { log(CefSettings.LogSeverity.LOGSEVERITY_ERROR, msg); }

    public void debug(String msg, Object... args) { log(CefSettings.LogSeverity.LOGSEVERITY_VERBOSE, msg, args); }
    public void info(String msg, Object... args) { log(CefSettings.LogSeverity.LOGSEVERITY_INFO, msg, args); }
    public void warn(String msg, Object... args) { log(CefSettings.LogSeverity.LOGSEVERITY_WARNING, msg, args); }
    public void error(String msg, Object... args) { log(CefSettings.LogSeverity.LOGSEVERITY_ERROR, msg, args); }

    public void log(CefSettings.LogSeverity log_severity, String msg) {
        log(log_severity, msg, null);
    }
    public void log(CefSettings.LogSeverity log_severity, String msg, Object... args) {
        if (msg == null)
            return;
        if (mySeverity.compareTo(log_severity) <= 0) {
            myPrintStream.printf("JCEF_%s(%s%s): %s\n", shortSeverity(log_severity), ourTimeFormat.format(new Date()),
                    TRACE_THREAD ? " | " + Thread.currentThread().getName() : "",
                    args == null || args.length == 0 ? msg : String.format(msg, args));
        }
    }

    public boolean isDebugEnabled() { return mySeverity.compareTo(CefSettings.LogSeverity.LOGSEVERITY_VERBOSE) <= 0; }
    public String getFilePath() { return myFilePath; }
    public CefSettings.LogSeverity getLogLevel() { return mySeverity; }

    static public void Debug(String msg, Object... args) { Log(CefSettings.LogSeverity.LOGSEVERITY_VERBOSE, msg, args); }
    static public void Info(String msg, Object... args) { Log(CefSettings.LogSeverity.LOGSEVERITY_INFO, msg, args); }
    static public void Warn(String msg, Object... args) { Log(CefSettings.LogSeverity.LOGSEVERITY_WARNING, msg, args); }
    static public void Error(String msg, Object... args) { Log(CefSettings.LogSeverity.LOGSEVERITY_ERROR, msg, args); }

    static public boolean IsDebugEnabled() { return INSTANCE != null ? INSTANCE.isDebugEnabled() : false; }
    static public String GetFilePath() { return INSTANCE != null ? INSTANCE.myFilePath : null; }
    static public CefSettings.LogSeverity GetLogLevel() { return INSTANCE != null ? INSTANCE.mySeverity : null; }

    static public void Log(CefSettings.LogSeverity log_severity, String msg, Object... args) {
        if (msg == null || INSTANCE == null)
            return;
        INSTANCE.log(log_severity, msg, args);
    }

}