/* ***** BEGIN LICENSE BLOCK *****
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 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or 
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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/*
    nsLiveConnect.cpp
 */

#include "nsLiveconnect.h"
#include "MRJMonitor.h"
#include "MRJPlugin.h"
#include "nsIPluginManager.h"

#include <string.h>

extern nsIPluginManager* thePluginManager;

const InterfaceInfo nsLiveconnect::sInterfaces[] = {
    { NS_ILIVECONNECT_IID, INTERFACE_OFFSET(nsLiveconnect, nsILiveconnect) },
    { NS_IPLUGINSTREAMLISTENER_IID, INTERFACE_OFFSET(nsLiveconnect, nsIPluginStreamListener) },
};
const UInt32 nsLiveconnect::kInterfaceCount = sizeof(sInterfaces) / sizeof(InterfaceInfo);

nsLiveconnect::nsLiveconnect()
    :   SupportsMixin(this, sInterfaces, kInterfaceCount),
        mJavaScriptMonitor(NULL), mScript(NULL), mResult(NULL)
{
}

nsLiveconnect::~nsLiveconnect()
{
    if (mJavaScriptMonitor != NULL)
        delete mJavaScriptMonitor;
}

static char* u2c(const jchar *ustr, jsize length)
{
    char* result = new char[length + 1];
    if (result != NULL) {
        char* cstr = result;
        while (length-- > 0) {
            *cstr++ = (char) *ustr++;
        }
        *cstr = '\0';
    }
    return result;
}

const char* kJavaScriptPrefix = "javascript:";

NS_METHOD   
nsLiveconnect::Eval(JNIEnv *env, jsobject obj, const jchar *script, jsize length, void* principalsArray[], 
                    int numPrincipals, nsISupports *securitySupports, jobject *outResult)
{
    MRJPluginInstance* pluginInstance = (MRJPluginInstance*) obj;
    nsIPluginStreamListener* listener = this;

    if (mJavaScriptMonitor == NULL)
        mJavaScriptMonitor = new MRJMonitor(pluginInstance->getSession());

    mJavaScriptMonitor->enter();

    while (mScript != NULL) {
        // some other thread is evaluating a script.
        mJavaScriptMonitor->wait();
    }
    
    // convert the script to ASCII, construct a "javascript:" URL.
    char* cscript = u2c(script, length);
    mScript = new char[strlen(kJavaScriptPrefix) + length + 1];
    strcpy(mScript, kJavaScriptPrefix);
    strcat(mScript, cscript);
    delete[] cscript;
    nsresult result = thePluginManager->GetURL((nsIPluginInstance*)pluginInstance, mScript, NULL, listener);
    
    // need to block until the result is ready.
    mJavaScriptMonitor->wait();
    
    // default result is NULL, in case JavaScript returns undefined value.
    *outResult = NULL;

    // result should now be ready, convert it to a Java string and return.
    if (mResult != NULL) {
        *outResult = env->NewStringUTF(mResult);
        delete[] mResult;
        mResult = NULL;
    }
    
    delete[] mScript;
    mScript = NULL;
    
    mJavaScriptMonitor->notifyAll();
    
    mJavaScriptMonitor->exit();
    
    return NS_OK;
}

NS_METHOD nsLiveconnect::OnDataAvailable(nsIPluginStreamInfo* pluginInfo, nsIInputStream* input, PRUint32 length)
{
    // hopefully all our data is available.
    mResult = new char[length + 1];
    if (mResult != NULL) {
        if (input->Read(mResult, length, &length) == NS_OK) {
            // We've delayed processing the applet tag, because we
            // don't know the location of the curren document yet.
            mResult[length] = '\0';
        }
    }
    return NS_OK;
}

NS_METHOD nsLiveconnect::OnStopBinding(nsIPluginStreamInfo* pluginInfo, nsresult status)
{
    // the stream has been closed, notify any waiting Java threads.
    mJavaScriptMonitor->notifyAll();
    return NS_OK;
}