package org.hwo.nativeloader;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.management.RuntimeErrorException;

import org.hwo.os.OsDetect;

public class NativeLoader {

	public static void loadLibrary(String libName)
	{
		try
		{
			System.loadLibrary(libName);
			return;
		} catch (UnsatisfiedLinkError e)
		{
			System.err.println("Native Library not found, trying to load from JAR-File");
			System.err.println(e);
			e.printStackTrace();
		}
		
		String platformLibName;
		String resourcePath;
		
		switch (OsDetect.getOperatingSystem())
		{
		case LINUX:
			platformLibName = String.format("lib%s.so",libName);
			break;
		case OSX:
			platformLibName = String.format("lib%s.dylib",libName);
			break;
		case WINDOWS:
			platformLibName = String.format("%s.dll",libName);
			break;
		default:
			throw new RuntimeException("Betriebssystem nicht unterstŸtzt!");
		}
		
		System.err.println(String.format("NativeLoader: Platform dependent Name: %s",platformLibName));
		
		resourcePath = "/native/" + platformLibName;
		System.err.println(String.format("NativeLoader: Resource name: %s",resourcePath));
		
		InputStream libInputStream = NativeLoader.class.getResourceAsStream(resourcePath);
		if (libInputStream == null)
		{
			System.err.println("Resource wurde nicht gefunden!");
		}
		
		try {
			File tempLibFile = File.createTempFile("native-", platformLibName);
			FileOutputStream fos = new FileOutputStream(tempLibFile);
			
			System.err.println(String.format("Using Temp File: %s",tempLibFile.getAbsoluteFile()));
			System.err.println(String.format("Size: %d",libInputStream.available()));
			
			byte[] buffer = new byte[libInputStream.available()];
			libInputStream.read(buffer);
			fos.write(buffer);
			fos.close();
			
			System.err.println(String.format("Loading: %s", tempLibFile.getAbsolutePath()));
			System.load(tempLibFile.getAbsolutePath());
			
		} catch (Exception e) {
			throw new RuntimeException(e);
			
		}

	}
	
	
}