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package com.googlecode.gwt.test.rpc;

import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.StatusCodeException;
import com.googlecode.gwt.test.RemoteServiceExecutionHandler;
import com.googlecode.gwt.test.exceptions.GwtTestException;
import com.googlecode.gwt.test.exceptions.GwtTestRpcException;
import com.googlecode.gwt.test.internal.BrowserSimulatorImpl;
import com.googlecode.gwt.test.internal.GwtConfig;
import com.googlecode.gwt.test.internal.patchers.AbstractRemoteServiceServletPatcher;
import com.googlecode.gwt.test.utils.GwtReflectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class GwtRpcInvocationHandler implements InvocationHandler {

    private static final Logger logger = LoggerFactory.getLogger(GwtRpcInvocationHandler.class);

    private final GwtRpcExceptionHandler exceptionHandler;
    private final Map methodTable;
    private final GwtRpcSerializerHandler serializerHander;
    private final Object target;

    public GwtRpcInvocationHandler(Class asyncClazz, Object target,
                                   GwtRpcExceptionHandler exceptionHandler, GwtRpcSerializerHandler serializerHandler) {

        this.target = target;
        this.exceptionHandler = exceptionHandler;
        this.serializerHander = serializerHandler;

        this.methodTable = new HashMap();
        for (Method m : asyncClazz.getMethods()) {
            for (Method m2 : target.getClass().getMethods()) {
                if (m.getName().equals(m2.getName())
                        && m.getParameterTypes().length == m2.getParameterTypes().length + 1) {
                    methodTable.put(m, m2);
                    GwtReflectionUtils.makeAccessible(m2);
                }
            }
        }
    }

    @SuppressWarnings("unchecked")
    public Object invoke(Object proxy, Method method, Object[] args) {
        Object[] subArgs = new Object[args.length - 1];
        for (int i = 0; i < args.length - 1; i++) {
            subArgs[i] = args[i];
        }

        final AsyncCallback callback = (AsyncCallback) args[args.length - 1];
        final Method m = methodTable.get(method);

        Command asyncCallbackCommand;

        if (m == null) {
            logger.error("Method not found " + method);

            // error 500 async call
            asyncCallbackCommand = new Command() {
                public void execute() {
                    callback.onFailure(new StatusCodeException(500, "No method found"));
                }
            };
        } else {

            try {
                logger.debug("Invoking " + m + " on " + target.getClass().getName());

                List handlers = GwtConfig.get().getModuleRunner().getRemoteServiceExecutionHandlers();

                // notify
                for (RemoteServiceExecutionHandler handler : handlers) {
                    handler.beforeRpcRequestSerialization(m, subArgs);
                }

                // Serialize objects
                Object[] serializedArgs = new Object[subArgs.length];
                for (int i = 0; i < subArgs.length; i++) {
                    try {
                        serializedArgs[i] = serializerHander.serializeUnserialize(subArgs[i]);
                    } catch (Exception e) {
                        throw new GwtTestRpcException("Error while serializing argument " + i
                                + " of type " + subArgs[i].getClass().getName() + " in method "
                                + method.getDeclaringClass().getSimpleName() + "." + method.getName()
                                + "(..)", e);
                    }
                }

                // notify
                for (RemoteServiceExecutionHandler handler : handlers) {
                    handler.beforeRpcRequestSerialization(m, serializedArgs);
                }

                AbstractRemoteServiceServletPatcher.currentCalledMethod = m;

                // notify
                for (RemoteServiceExecutionHandler handler : handlers) {
                    handler.beforeRpcMethodExecution(m, serializedArgs);
                }

                Object resultObject = m.invoke(target, serializedArgs);

                // notify
                for (RemoteServiceExecutionHandler handler : handlers) {
                    handler.afterRpcMethodExecution(m, resultObject);
                }

                Object returnObject;
                try {
                    // notify
                    for (RemoteServiceExecutionHandler handler : handlers) {
                        handler.beforeRpcResponseSerialization(m, resultObject);
                    }
                    returnObject = serializerHander.serializeUnserialize(resultObject);
                    // notify
                    for (RemoteServiceExecutionHandler handler : handlers) {
                        handler.afterRpcResponseSerialization(m, returnObject);
                    }
                } catch (Exception e) {
                    throw new GwtTestRpcException("Error while serializing object of type "
                            + resultObject.getClass().getName()
                            + " which was returned from RPC Service "
                            + method.getDeclaringClass().getSimpleName() + "." + method.getName()
                            + "(..)", e);
                }

                final Object o = returnObject;

                // success async call
                asyncCallbackCommand = new Command() {
                    public void execute() {
                        logger.debug("Result of " + m.getName() + " : " + o);
                        callback.onSuccess(o);
                    }
                };

            } catch (final InvocationTargetException e) {
                if (GwtTestException.class.isInstance(e.getCause())) {
                    throw (GwtTestException) e.getCause();
                }
                asyncCallbackCommand = new Command() {
                    public void execute() {
                        logger.info("Exception when invoking service throw to handler " + e.getMessage());
                        exceptionHandler.handle(e.getCause(), callback);
                    }
                };
            } catch (final IllegalAccessException e) {
                asyncCallbackCommand = new Command() {
                    public void execute() {
                        logger.error("GWT RPC exception : " + e.toString(), e);
                        callback.onFailure(new StatusCodeException(500, e.toString()));
                    }
                };
            } catch (final IllegalArgumentException e) {
                asyncCallbackCommand = new Command() {
                    public void execute() {
                        logger.error("GWT RPC exception : " + e.toString(), e);
                        callback.onFailure(new StatusCodeException(500, e.toString()));
                    }
                };
            }

        }
        // delegate the execution to the Browser simulator
        BrowserSimulatorImpl.get().recordAsyncCall(asyncCallbackCommand);

        // async callback always return void
        return null;
    }
}
 















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