/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.ant.frontend;

import org.apache.ant.core.support.*;
import org.apache.ant.core.model.*;
import org.apache.ant.core.execution.*;
import java.io.*;

/**
 *  Writes build event to a PrintStream. Currently, it
 *  only writes which targets are being executed, and
 *  any messages that get logged.
 */
public class DefaultLogger implements BuildLogger {
    private static int LEFT_COLUMN_SIZE = 12;

    protected PrintStream out;
    protected PrintStream err;
    protected int msgOutputLevel = BuildEvent.MSG_ERR;
    private long startTime = System.currentTimeMillis();

    protected static String lSep = System.getProperty("line.separator");

    protected boolean emacsMode = false;

    /**
     * Set the msgOutputLevel this logger is to respond to.
     *
     * Only messages with a message level lower than or equal to the given level are 
     * output to the log.
     * <P>
     * Constants for the message levels are in Project.java. The order of
     * the levels, from least to most verbose, is MSG_ERR, MSG_WARN,
     * MSG_INFO, MSG_VERBOSE, MSG_DEBUG.
     *
     * The default message level for DefaultLogger is Project.MSG_ERR.
     *
     * @param level the logging level for the logger.
     */
    public void setMessageOutputLevel(int level) {
        this.msgOutputLevel = level;
    }

    
    /**
     * Set the output stream to which this logger is to send its output.
     *
     * @param output the output stream for the logger.
     */
    public void setOutputPrintStream(PrintStream output) {
        this.out = output;
    }

    /**
     * Set the output stream to which this logger is to send error messages.
     *
     * @param err the error stream for the logger.
     */
    public void setErrorPrintStream(PrintStream err) {
        this.err = err;
    }

    /**
     * Set this logger to produce emacs (and other editor) friendly output.
     *
     * @param emacsMode true if output is to be unadorned so that emacs and other
     * editors can parse files names, etc.
     */
    public void setEmacsMode(boolean emacsMode) {
        this.emacsMode = emacsMode;
    }

    public void reportException(Throwable t) {
        if (t instanceof AntException) {
            AntException e = (AntException)t;
            Location location = e.getLocation();
            Throwable cause = e.getCause();
            if (location != null && location != Location.UNKNOWN_LOCATION) {
                out.print(location);
            }
            out.println(e.getMessage());
            
            if (cause != null) {
                out.println("Root cause: " + cause.toString());
            }
        }
        else {
            t.printStackTrace(err);
        }
    }
    
    public void processBuildEvent(BuildEvent event) {
        switch (event.getEventType()) {
            case BuildEvent.BUILD_STARTED:
                startTime = System.currentTimeMillis();
                break;
            case BuildEvent.BUILD_FINISHED:
                Throwable cause = event.getCause();
        
                if (cause == null) {
                    out.println(lSep + "BUILD SUCCESSFUL");
                }
                else {
                    err.println(lSep + "BUILD FAILED" + lSep);
        
                    reportException(cause);
                }
        
                out.println(lSep + "Total time: " + formatTime(System.currentTimeMillis() - startTime));
                break;
            case BuildEvent.TARGET_STARTED:
                if (BuildEvent.MSG_INFO <= msgOutputLevel) {
                    Target target = (Target)event.getBuildElement();
                    out.println(lSep + target.getName() + ":");
                }
                break;
            case BuildEvent.TARGET_FINISHED:
                break;
            case BuildEvent.TASK_STARTED:
                break;
            case BuildEvent.TASK_FINISHED:
                break;
            case BuildEvent.MESSAGE:
                PrintStream logTo = event.getPriority() == BuildEvent.MSG_ERR ? err : out;
        
                // Filter out messages based on priority
                if (event.getPriority() <= msgOutputLevel) {
        
                    // Print out the name of the task if we're in one
                    Object buildElement = event.getBuildElement();
                    if (buildElement instanceof TaskElement) {
                        TaskElement taskElement = (TaskElement)buildElement;
                        String name = taskElement.getType();
        
                        if (!emacsMode) {
                            String msg = "[" + name + "] ";
                            for (int i = 0; i < (LEFT_COLUMN_SIZE - msg.length()); i++) {
                                logTo.print(" ");
                            }
                            logTo.print(msg);
                        }
                    }
        
                    // Print the message
                    logTo.println(event.getMessage());
                }
                break;
            default:
                err.println("Unrecognized event type = " + event.getEventType());
                break;
        }
    }            

    protected static String formatTime(long millis) {
        long seconds = millis / 1000;
        long minutes = seconds / 60;


        if (minutes > 0) {
            return Long.toString(minutes) + " minute"
                + (minutes == 1 ? " " : "s ")
                + Long.toString(seconds%60) + " second"
                + (seconds%60 == 1 ? "" : "s");
        }
        else {
            return Long.toString(seconds) + " second"
                + (seconds%60 == 1 ? "" : "s");
        }

    }

}