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package thewebsemantic;

import static thewebsemantic.Bean2RDF.logger;
import static thewebsemantic.PrimitiveWrapper.isPrimitive;
import static thewebsemantic.TypeWrapper.wrap;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.logging.Level;

import thewebsemantic.Base.NullType;

import com.hp.hpl.jena.ontology.OntResource;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.Property;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.Statement;
import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.vocabulary.RDF;

/**
 * 
 * 
 *
 */
public class Thing implements InvocationHandler, As {
	private Model model;

	private Resource r;

	private static Method as;
	private static Method isa;
	private static Method asResource;
	static {
		try {
			as = As.class.getMethod("as", Class.class);
			isa = As.class.getMethod("isa", Class.class);
			asResource = As.class.getMethod("asResource");
		} catch (Exception e) {
			logger.log(Level.WARNING, "Could not access methods on As interface.", e);
		}
	}

	public Thing(Resource resource, Model m) {
		model = m;
		r = resource;
	}

	public Thing(String resource, Model m) {
		this(m.getResource(resource), m);
	}
	
	public Thing(Model m) {
		this(m.createResource(), m);
	}

	public Thing at(String uri) {
		return new Thing(uri, model);
	}
	
	public Resource getResource() {
		return r;
	}
	
	public OntResource getOntResource() {
		return (OntResource)r.as(OntResource.class);
	}
	
	public Model getModel() {
		return model;
	}

	public <T> T as(Class<T> c) {
		return (T) Proxy.newProxyInstance(c.getClassLoader(),
				new Class[] { c }, this);
	}
	
	public <T> T isa(Class<T> c) {
		String ns = c.getEnclosingClass().getAnnotation(Namespace.class).value();
        RdfType rdfType = c.getEnclosingClass().getAnnotation(RdfType.class);
        r.addProperty(RDF.type, model.getResource(ns+Util.getRdfType(c)));
		return as(c);
	}


	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		Class<?> returnType = method.getReturnType();
		if (method.equals(as))
			return as((Class) args[0]);
		else if ( method.equals(isa))
			return isa((Class) args[0]);
		else if ( method.equals(asResource))
			return asResource();
		else if (method.getParameterTypes().length == 0)
			return get(method);
		else if (method.isAnnotationPresent(Functional.class)) {
			set(method, args);
			return proxy;
		}
		add(method, args);
		return proxy;
	}

	public Resource asResource() {
		return this.r;
	}

	private Object get(Method m) {
		String methodName = trim(m.getName());
		Class<?> genericType = Object.class;
		if (m.getGenericReturnType() instanceof ParameterizedType)
			genericType = getGenericType((ParameterizedType) m
					.getGenericReturnType());
		Class<?> returnType = m.getReturnType();
		Class<?> c = m.getDeclaringClass();
		String ns = wrap(c).namespace();
		Property p = model.getProperty(ns + methodName);
		StmtIterator it = r.listProperties(p);
		if (isPrimitive(returnType))
			return primitive(returnType, it);
		else if (returnType==Literal.class)
			return literal(it);
		else if (returnType==Thing.class)
			return thing(it);
		else if (returnType==Collection.class && genericType==Literal.class)
			return literalCollection(it);
		else if (returnType==Collection.class && isPrimitive(genericType))
			return primitiveCollection(it,returnType);
		else if (returnType==Collection.class
				&& genericType.equals(Thing.class))
			return thingCollection(it);
		return null;
	}

	private Literal thing(StmtIterator it) {
		Statement s = it.nextStatement();
		if (s.getObject().isLiteral())
			return s.getLiteral();
		else
			return null;
	}

	private Object literal(StmtIterator it) {
		return it.nextStatement().getLiteral();
	}

	private Object primitive(Class<?> returnType, StmtIterator it) {
		return JenaHelper.convertLiteral(it.nextStatement().getLiteral(),
				returnType);
	}

	private Object thingCollection(StmtIterator it) {
		ArrayList<Object> list = new ArrayList<Object>();
		while (it.hasNext()) {
			Statement s = it.nextStatement();
			if (!s.getObject().isLiteral())
				list.add(new Thing(s.getResource(), s.getModel()));
		}
		return list;
	}

	public Class<?> getGenericType(ParameterizedType type) {
		return (type == null) ? NullType.class : (Class<?>) type
				.getActualTypeArguments()[0];
	}

	private Object literalCollection(StmtIterator it) {
		ArrayList<Object> list = new ArrayList<Object>();
		while (it.hasNext()) {
			Statement s = it.nextStatement();
			if (s.getObject().isLiteral())
				list.add(s.getLiteral());
		}
		return list;
	}
	
	private Object primitiveCollection(StmtIterator it, Class t) {
		ArrayList<Object> list = new ArrayList<Object>();
		while (it.hasNext()) {
			Statement s = it.nextStatement();
			if (s.getObject().isLiteral())
				list.add( JenaHelper.convertLiteral(s.getLiteral(),t));
		}
		return list;
	}
	private void set(Method m, Object[] arg) {
		Property p = getProperty(m);
		r.removeAll(p);
		apply(arg, p, m.getParameterTypes()[0] == Object.class);
	}

	private Property getProperty(Method m) {
		String methodName =  trim(m.getName());
		Class<?> c = m.getDeclaringClass();
		String ns = wrap(c).namespace();
		Property p = model.getProperty(ns + methodName);
		return p;
	}

	private void add(Method m, Object[] arg) {
		Property p = getProperty(m);
		apply(arg, p, m.getParameterTypes()[0] == Object.class);
	}

	private void apply(Object[] arg, Property p, boolean rawLiteral) {
		if (PrimitiveWrapper.isPrimitive(arg[0])) {
			if (arg.length < 2 ) {
				if (rawLiteral)
					r.addProperty(p, arg[0].toString());
				else
					r.addProperty(p, JenaHelper.toLiteral(model, arg[0]));
			} else
				r.addProperty(p, arg[0].toString(), arg[1].toString());
		} else if (arg[0] instanceof Thing)
			set(p, (Thing) arg[0]);
		else if (arg[0] instanceof As)
			set(p, ((As)arg[0]).asResource());
		else if (arg[0] instanceof URI)
			set(p, ((URI)arg[0]).toString());
	}

	private void set(Property p, Thing arg) {
		set(p, arg.getResource());
	}

	private void set(Property p, String arg) {
		set(p, model.getResource(arg));
	}
	
	private void set(Property p, Resource object) {
		r.addProperty(p, object);
	}

	private String trim(String s) {
		if (s.endsWith("_"))
			return s.substring(0, s.length()-1);
		else
			return s;
	}
	
	public String toString() { return this.r.getURI();}


}