/*
 * Copyright (c) 2005, Stanford University. All rights reserved. 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions
 * are met: 
 *  - Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *  - 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. 
 *  - Neither the name of the Stanford University nor the names of its 
 *    contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS 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 
 * COPYRIGHT OWNER OR 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. 
 */

/*
 * Created on Sep 12, 2005
 * Original author: Christopher Bruns
 */
package org.simtk.isimsu;

import java.io.*;
import java.util.*;

public class ExternalProcessManager extends Thread {
    String[] commandArgs;
    File workingDirectory              = null;
    Map<String, String> environmentMap = null;
    public Exception exception         = null;
    int waitForCompletion              = 1;
    LogDialog logDialog                = null;
    StreamReaderThread stdOutGobbler;
    StreamReaderThread stdErrGobbler;
    
    // public boolean hadAProblem = false;
    
    ExternalProcessManager(String[] command, File dir) {
        commandArgs      = command;
        workingDirectory = dir;
        logDialog        = null;
    }
    
    ExternalProcessManager(String[] command, File dir, Map<String, String> inputEnvironmentMap ) {
        commandArgs           = command;
        workingDirectory      = dir;
        environmentMap        = inputEnvironmentMap;
        
    }
    
    public void setLogDialog( LogDialog inputLogDialog ) {
    	logDialog = inputLogDialog;             
    }
    
    public void run() {

        try {
        	
        	// System.getProperties().list(System.out);
        	
            // Process process = Runtime.getRuntime().exec(commandArgs, null, workingDirectory);
        	ProcessBuilder processBuilder = new ProcessBuilder( commandArgs );
        	
        	// set working directory, if provided
        	
        	if( workingDirectory != null ){
        		processBuilder.directory( workingDirectory );
        	}
        	
        	// add environment variables if any
        	
        	if( environmentMap != null ){
        		Map<String, String> currentEnvironmentMap = processBuilder.environment();
        		for (Map.Entry<String, String> entry : environmentMap.entrySet()){
        			currentEnvironmentMap.put( entry.getKey(), entry.getValue() );
        		}
        		
        	}
        	
        	StringBuffer message = new StringBuffer();
        	
        	// show environment settings
        	
        	message.append( "Environment variable settings\n" );
        	Map<String, String> currentEnvironmentMap = processBuilder.environment();
    		for (Map.Entry<String, String> entry : currentEnvironmentMap.entrySet()){
    			message.append( entry.getKey() + "=" + entry.getValue() + "\n" );
    		}
    		
        	// ready for liftoff
        	
        	message.append( "\nIssuing command: <" );
        	for( int ii = 0; ii < commandArgs.length; ii++ ){
        	   message.append( commandArgs[ii] + " " );
        	}
        	message.append( ">\n" );      	
        	
            outputMessage( message.toString() );
        	
        	Process process = processBuilder.start();
        	
        	message = new StringBuffer();
        	message.append( "Issued command\n" );
        	outputMessage( message.toString() );
         	
            // Capture all program output to screen
            stdOutGobbler = new StreamReaderThread(process.getInputStream());
            stdErrGobbler = new StreamReaderThread(process.getErrorStream());
            stdOutGobbler.start();
            stdErrGobbler.start();
        
            // Wait for process to end
            if( waitForCompletion != 0 ){
               process.waitFor();
            }
            
            stdOutGobbler.join();
            stdErrGobbler.join();
            
            System.out.println(stdOutGobbler.getLog());
            System.err.println(stdErrGobbler.getLog());
            
            if (process.exitValue() != 0) exception = new RuntimeException("Process terminated with exit value " + process.exitValue());
        }
        catch (IOException exc) {
            exception = exc;
        }
        catch (InterruptedException exc) {
            exception = exc;
        }
        
    }
    
    // get os type from System os.name
    
    static public String getOsType( ){
    	
       String osName = System.getProperty( "os.name" );
              
       if( java.util.regex.Pattern.matches( "^Windows.*", osName ) ){
    	   System.out.println( "Windows match");
    	   return new String( "Windows" );
       }
       
       if( java.util.regex.Pattern.matches( "^Linux.*", osName ) ){
    	   System.out.println( "Linux match");
    	   return new String( "Linux" );
       }
       
       if( java.util.regex.Pattern.matches( "^Mac.*", osName ) ){
    	   System.out.println( "Mac match");
    	   return new String( "Mac" );
       }
       
       System.out.println( "No match <" + osName + ">\n" );
       
       return osName;
    }
    
    public int setWaitForCompletion( int newWaitForCompletion ){
    	waitForCompletion = newWaitForCompletion;
    	return 0;
    }
    
    // output message
    
    public void outputMessage( String message ){
    	
    	if( logDialog != null ){
    		logDialog.append( message.toString() );
    	}
    	System.out.println( message.toString() );
    	System.out.flush();
    }
    
    String getStdOut() {return new String(stdOutGobbler.getLog());}
    String getStdErr() {return new String(stdErrGobbler.getLog());}
}