import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.apache.tuscany.SourceExplore.ObjectFactory;
import org.apache.tuscany.SourceExplore.Package;
import org.apache.tuscany.SourceExplore.Projects;
import org.apache.tuscany.SourceExplore.Projects2;
import org.apache.tuscany.SourceExplore.Projects2.Project;



public class HashSPISource {
	
	public static void main(String[] args) throws Throwable {
	
		ObjectFactory fac = new ObjectFactory();
		

		String sourceRoot = "c:/Dev2/SCA";
		String inputXML = "src/main/resources/projects.xml";
		
		JAXBContext jaxbContext = JAXBContext
			.newInstance("org.apache.tuscany.SourceExplore");
			Unmarshaller um = jaxbContext.createUnmarshaller();

				
				File inputFile = new File(inputXML).getAbsoluteFile();
				Projects p = (Projects)um.unmarshal(inputFile);
				List<JAXBElement<String>> data = p.getProjectOrPackage();
				System.out.println(p);
				
				
				Projects2 p2 = fac.createProjects2();


				
				for (int i = 0; i < data.size(); i++) {
					Project proj = null;
					if(!"project".equals(data.get(i).getName().getLocalPart())) {
						throw new Exception("Expecting a project element " + i);
					} else {
						System.out.println("project: " + data.get(i).getValue());
						proj = fac.createProjects2Project();
						proj.setName(data.get(i).getValue());
						p2.getProject().add(proj);
					}
					for(i++;i<data.size() && "package".equals(data.get(i).getName().getLocalPart());i++) {
						if(!"package".equals(data.get(i).getName().getLocalPart())) {
							throw new Exception("Expecting a package element " + i);
						} else {
    						System.out.println("package: " + data.get(i).getValue());
    						Package pkg = fac.createPackage();
    						pkg.setName(data.get(i).getValue());
    						proj.getPackage().add(pkg);
    						processPackage(sourceRoot, proj, pkg);
						}
					}
					i--;
				}
				FileOutputStream fos = new FileOutputStream(new File("src/main/resources/out.xml").getAbsoluteFile());
				Marshaller m = jaxbContext.createMarshaller();
				m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
				m.marshal(p2, fos);
				fos.close();
			
				
	}

	private static void processPackage(String sourceRoot, Project proj,	Package pkg) {
		
		ObjectFactory fac = new ObjectFactory();
		
		String pkgPath = pkg.getName().replace('.', '/' );
	    String folderPath = sourceRoot +"/" + proj.getName() +"/src/main/java/" + pkgPath;
	    File folder = new File(folderPath);
	    File[] contents = folder.listFiles();
	    
	    List<org.apache.tuscany.SourceExplore.File> files = pkg.getFile();
	    if(contents!= null) {
	    for (File file : contents) {
	    	if(ofInterest(file)) {
	    		org.apache.tuscany.SourceExplore.File f = fac.createFile();
	    		f.setName(file.getPath());
	    		String digest = md5(file);
	    		f.setDigest(digest);
	    		files.add(f);
	    	}
			System.out.println(file.getName());
		}
	    }
	}

	private static String md5(File f) {
		MessageDigest digest = null;
		try {
			digest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

		InputStream is = null;
		String output = null;
		try {
			is = new FileInputStream(f);
		} catch (FileNotFoundException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}				
		byte[] buffer = new byte[8192];
		int read = 0;
		try {
			while( (read = is.read(buffer)) > 0) {
				digest.update(buffer, 0, read);
			}		
			byte[] md5sum = digest.digest();
			BigInteger bigInt = new BigInteger(1, md5sum);
			output = bigInt.toString(16);
			System.out.println("MD5: " + output);
		}
		catch(IOException e) {
			throw new RuntimeException("Unable to process file for MD5", e);
		}
		finally {
			try {
				is.close();
			}
			catch(IOException e) {
				throw new RuntimeException("Unable to close input stream for MD5 calculation", e);
			}
		}		
		return output;
	}

	private static boolean ofInterest(File file) {
		boolean result = false;
		
		if(!result) result = file.getPath().endsWith(".java"); 
		return result;
	}


}