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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.bridge;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.Map;

/**
 * This class takes the supplied PHP environment and creates a dynamic
 * proxy for calling PHP code.
 */
public final class PhpProcedure implements InvocationHandler {

    private IJavaBridgeFactory bridge;
    private long object;
    private Map names;
    protected String name;

    public PhpProcedure(IJavaBridgeFactory bridge, long object, String name, Map names) {
        this.bridge = bridge;
        this.object = object;
        this.names = names;
        this.name = name;
    }

    /**
     * Called from java_closure().
     *
     * @param bridge     - The request handling bridge
     * @param name       - The name, e.g. java_closure($this, "alwaysCallMe")
     * @param names      - A map of names, e.g. java_closure($this, array("javaName1" => "php_name1", ...);
     * @param interfaces - The list of interfaces that this proxy must implement, may be empty. E.g. 
     *                     java_closure($this, null, null, array(new Java("java.awt.event.ActionListener"));
     * @param object     - An opaque object ID (protocol-level).
     * @return A new proxy instance.
     */
    protected static Object createProxy(IJavaBridgeFactory bridge, String name, Map names, Class interfaces[], long object) {
        PhpProcedure handler = new PhpProcedure(bridge, object, name, names);
        ClassLoader loader = Util.getContextClassLoader();

        Object proxy = Proxy.newProxyInstance(loader, interfaces, handler);
        return proxy;
    }

    /**
     * Called from getInterface().
     *
     * @param interfaces - The list of interfaces that this proxy must implement, may be empty.
     * @param proc       - A procedure obtained from java_closure().
     * @return A new proxy instance.
     */
    public static Object createProxy(Class interfaces[], PhpProcedure proc) {
        return createProxy(proc.bridge, proc.name, proc.names, interfaces, proc.object);
    }

    private Object invoke(Object proxy, String method, Class returnType, Object[] args) throws Throwable {
        JavaBridge bridge = this.bridge.getBridge();
        if (bridge.logLevel > 3) bridge.logDebug("invoking callback: " + method);
        String cname;
        if (name != null) {
            cname = name;
        } else {
            cname = (String) names.get(method);
            if (cname == null) cname = method;
        }
        bridge.request.response.setResultProcedure(object, cname, method, args);
        Object[] result = bridge.request.handleSubRequests();
        if (bridge.logLevel > 3) bridge.logDebug("result from cb: " + Arrays.asList(result));
        return bridge.coerce(returnType, result[0], bridge.request.response);
    }

    private void checkPhpContinuation() throws IllegalStateException {
        if (bridge.isNew())
            throw new IllegalStateException("Cannot call closure anymore: the closed-over PHP script continuation has been terminated.");
    }

    /**
     * Invoke a PHP function or a PHP method.
     *
     * @param proxy  The php environment or the PHP object
     * @param method The php method name
     * @param args   the arguments
     * @return the result or null.
     * @throws Throwable script exception.
     */
    public Object invoke(Object proxy, String method, Object[] args) throws Throwable {
        checkPhpContinuation();

        return invoke(proxy, method, Object.class, args);
    }

    /**
     * {@inheritDoc}
     */
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        checkPhpContinuation();

        return invoke(proxy, method.getName(), method.getReturnType(), args);
    }

    public static long unwrap(Object ob) {
        InvocationHandler handler = Proxy.getInvocationHandler(ob);
        PhpProcedure proc = (PhpProcedure) handler;
        return proc.object;
    }
}