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package net.contextfw.web.commons.cloud.internal.serializer;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import net.contextfw.web.application.development.DevelopmentModeListener;
import net.contextfw.web.application.development.DevelopmentTools;

import org.apache.commons.io.output.ByteArrayOutputStream;

import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Singleton;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.binary.BinaryStreamDriver;
import com.thoughtworks.xstream.io.binary.BinaryStreamReader;
import com.thoughtworks.xstream.io.binary.BinaryStreamWriter;
import com.thoughtworks.xstream.mapper.MapperWrapper;

@Singleton
public class Serializer implements DevelopmentModeListener {

    private ThreadLocal xstream = getNewXStream();
    
    private final Injector injector;
    
    private KeyConverter keyConverter = new KeyConverter();
    
    private ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    
    @Inject
    public Serializer(final Injector injector, DevelopmentTools developmentTools) {
        this.injector = injector;
        developmentTools.addListener(this);
    }
    
    public byte[] serialize(Object obj) {
        ByteArrayOutputStream out = null;
        out = new ByteArrayOutputStream();
        BinaryStreamWriter bwriter = new BinaryStreamWriter(out);
        xstream.get().marshal(obj, bwriter);
        close(out);
        return out.toByteArray();
    }
    
    private void close(OutputStream stream) {
        try {
            stream.close();
        } catch (IOException e) {
            // Just ignore
        }
    }
    
    public Object unserialize(byte[] serialized) {
        InputStream xml = new ByteArrayInputStream(serialized);
        return xstream.get().unmarshal(new BinaryStreamReader(xml));
    }

    private ThreadLocal getNewXStream() {
        return new ThreadLocal() {
            @Override
            protected XStream initialValue() {
                XStream rv = new XStream(new BinaryStreamDriver()) {
                    @Override
                    protected MapperWrapper wrapMapper(MapperWrapper next) {
                        return new DependencyMapper(next, injector, classLoader);
                    }
                };
                rv.registerConverter(keyConverter);
                rv.setClassLoader(classLoader);
                return rv;
            }
        };
    }

    @Override
    public void classesReloaded(ClassLoader classLoader) {
        this.classLoader = classLoader;
        keyConverter.setClassLoader(classLoader);
        xstream = getNewXStream();
    }

    @Override
    public void resourcesReloaded() {
    }
}