/*

 * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jpackage.internal;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.PrintStream;

import java.io.PrintWriter;

/**

 * Log

 *

 * General purpose logging mechanism.

 */

public class Log {

    public static class Logger {

        private boolean verbose = false;

        private PrintWriter out = null;

        private PrintWriter err = null;

        // verbose defaults to true unless environment variable JPACKAGE_DEBUG

        // is set to true.

        // Then it is only set to true by using --verbose jpackage option

        public Logger() {

            verbose = ("true".equals(System.getenv("JPACKAGE_DEBUG")));

        }

        public void setVerbose() {

            verbose = true;

        }

        public boolean isVerbose() {

            return verbose;

        }

        public void setPrintWriter(PrintWriter out, PrintWriter err) {

            this.out = out;

            this.err = err;

        }

        public void flush() {

            if (out != null) {

                out.flush();

            }

            if (err != null) {

                err.flush();

            }

        }

        public void info(String msg) {

            if (out != null) {

                out.println(msg);

            } else {

                System.out.println(msg);

            }

        }

        public void error(String msg) {

            if (err != null) {

                err.println(msg);

            } else {

                System.err.println(msg);

            }

        }

        public void verbose(Throwable t) {

            if (out != null && verbose) {

                t.printStackTrace(out);

            } else if (verbose) {

                t.printStackTrace(System.out);

            }

        }

        public void verbose(String msg) {

            if (out != null && verbose) {

                out.println(msg);

            } else if (verbose) {

                System.out.println(msg);

            }

        }

    }

    private static Logger delegate = null;

    public static void setLogger(Logger logger) {

        delegate = (logger != null) ? logger : new Logger();

    }

    public static void flush() {

        if (delegate != null) {

            delegate.flush();

        }

    }

    public static void info(String msg) {

        if (delegate != null) {

           delegate.info(msg);

        }

    }

    public static void error(String msg) {

        if (delegate != null) {

            delegate.error(msg);

        }

    }

    public static void setVerbose() {

        if (delegate != null) {

            delegate.setVerbose();

        }

    }

    public static boolean isVerbose() {

        return (delegate != null) ? delegate.isVerbose() : false;

    }

    public static void verbose(String msg) {

        if (delegate != null) {

           delegate.verbose(msg);

        }

    }

    public static void verbose(Throwable t) {

        if (delegate != null) {

           delegate.verbose(t);

        }

    }

}