/*******************************************************************************
 * Copyright (c) 2014 Jeff Martin.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Jeff Martin - initial API and implementation
 ******************************************************************************/
package cuchaz.enigma;

import java.awt.Desktop;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.jar.JarFile;

import javassist.CannotCompileException;
import javassist.CtClass;
import javassist.bytecode.Descriptor;

import com.google.common.io.CharStreams;


public class Util
{
	public static int combineHashesOrdered( Object ... objs )
	{
		final int prime = 67;
		int result = 1;
		for( Object obj : objs )
		{
			result *= prime;
			if( obj != null )
			{
				result += obj.hashCode();
			}
		}
		return result;
	}
	
	public static void closeQuietly( Closeable closeable )
	{
		if( closeable != null )
		{
			try
			{
				closeable.close();
			}
			catch( IOException ex )
			{
				// just ignore any further exceptions
			}
		}
	}
	
	public static void closeQuietly( JarFile jarFile )
	{
		// silly library should implement Closeable...
		if( jarFile != null )
		{
			try
			{
				jarFile.close();
			}
			catch( IOException ex )
			{
				// just ignore any further exceptions
			}
		}
	}

	public static String readStreamToString( InputStream in )
	throws IOException
	{
		return CharStreams.toString( new InputStreamReader( in, "UTF-8" ) );
	}
	
	public static String readResourceToString( String path )
	throws IOException
	{
		InputStream in = Util.class.getResourceAsStream( path );
		if( in == null )
		{
			throw new IllegalArgumentException( "Resource not found! " + path );
		}
		return readStreamToString( in );
	}
	
	public static void openUrl( String url )
	{
		if( Desktop.isDesktopSupported() )
		{
			Desktop desktop = Desktop.getDesktop();
			try
			{
				desktop.browse( new URI( url ) );
			}
			catch( IOException ex )
			{
				throw new Error( ex );
			}
			catch( URISyntaxException ex )
			{
				throw new IllegalArgumentException( ex );
			}
		}
	}
	
	public static void writeClass( CtClass c )
	{
		String name = Descriptor.toJavaName( c.getName() );
		File file = new File( name + ".class" );
		try( FileOutputStream out = new FileOutputStream( file ) )
		{
			out.write( c.toBytecode() );
		}
		catch( IOException | CannotCompileException ex )
		{
			throw new Error( ex );
		}
	}
}