package org.hwo.platform.natives;

import java.io.File;
import java.io.IOException;
import org.hwo.platform.Platform;
import org.hwo.platform.Ressource;

public class NativeLoader {
	private static boolean patchedLinux = false;
	
	public static String nativeLibraryName(String libName){
		switch (Platform.getOperatingSystem())
		{
		case LINUX:
			return String.format("lib%s.so",libName);
		case OSX:
			return String.format("lib%s.dylib",libName);
		case WINDOWS:
			return String.format("%s.dll",libName);
		default:
			throw new RuntimeException("Betriebssystem nicht unterstützt!");
		}		
	}
	
	public static String nativeResourceName(String libName){
		return String.format("/native/%s/%s", Platform.PlatformName(), nativeLibraryName(libName));
	}

	public static String nativeLocalResourceName(String libName){
		return String.format("native%s%s%s%s", File.separator, Platform.PlatformName(), File.separator, nativeLibraryName(libName));
	}
	
	
	
	/*
	 * loadLibrary()
	 * 
	 * Versuche native Bibliothek zu laden
	 * 
	 * 1. System.loadLibrary(...)
	 * 2. System.load(...)
	 * 3. /native/...
	 * 4. CLASSPATH:/native/...
	 * 
	 */
	public static void loadLibrary(String libName)
	{		
		try
		{
			System.loadLibrary(libName);
			System.out.println(String.format("NativeLoader.loadLibrary(): System.loadLibrary('%s') erfolgreich",libName));
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println(String.format("NativeLoader.loadLibrary(): System.loadLibrary('%s') erfolglos",libName));
		};
		
		String libFileName = new File("").getAbsolutePath() + File.separator + nativeLibraryName(libName);
		try
		{
			System.load(libFileName);
			System.out.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolgreich",libFileName));
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolglos",libFileName));
		};

		String nativeLocalResourceName = new File("").getAbsolutePath() + File.separator + nativeLocalResourceName(libName);
		try
		{
			System.load(nativeLocalResourceName);
			System.out.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolgreich",nativeLocalResourceName));
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolglos",nativeLocalResourceName));
		};

		
		String nativeResourceName = nativeResourceName(libName);
		try
		{
			System.load(nativeResourceName);
			System.out.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolgreich",nativeResourceName));
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolglos",nativeResourceName));
		};
		
		File tempLibFile;
		try {
			tempLibFile = File.createTempFile("extract-", nativeLibraryName(libName));
		} catch (IOException ioe){
			System.err.println(String.format("NativeLoader.loadLibrary(): File.createTempFile('extract-','%s') erfolglos",nativeLibraryName(libName)));
			throw new RuntimeException(ioe);
		}

		try {
			Ressource.extract(nativeResourceName, tempLibFile.getAbsolutePath());
			System.load(tempLibFile.getAbsolutePath());
			System.out.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolgreich",tempLibFile.getAbsolutePath()));
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println(String.format("NativeLoader.loadLibrary(): System.load('%s') erfolglos",tempLibFile.getAbsolutePath()));
		} catch (Exception e){
			System.err.println(String.format("NativeLoader.loadLibrary(): Resource.extract('%s','%s') erfolglos",nativeResourceName,tempLibFile.getAbsolutePath()));
			throw new RuntimeException(e);
		}
	}

	static {
		/* Suchpfad um aktuelles Arbeitsberzeichnis erweitern */
		System.setProperty("java.library.path",String.format(".:%s",System.getProperty("java.library.path")));		
	}
	
}