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/***************************************************************************
 *   Copyright (C) December 10, 2008 by Mattias Runge                             *
 *   mattias@runge.se                                                      *
 *   virtualmachine.cpp                                            *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include "virtualmachine.h"

VirtualMachine* VirtualMachine::myInstance = NULL;

VirtualMachine& VirtualMachine::getInstance()
{
    if (myInstance == NULL)
    {
        myInstance = new VirtualMachine();
    }

    return *myInstance;
}

void VirtualMachine::deleteInstance()
{
    if (myInstance != NULL)
    {
        delete myInstance;
        myInstance = NULL;
    }
}

VirtualMachine::VirtualMachine()
{
}

VirtualMachine::~VirtualMachine()
{
    stop();

    myCommandThread.stop();

    ///FIXME: Verify that this works and does not cause segfaults
    for (map<unsigned long int, SocketThread*>::iterator iter = mySocketThreads.begin(); iter != mySocketThreads.end(); iter++)
    {
        iter->second->stop();
        delete iter->second;
        //mySocketThreads.erase(iter);
    }

    mySocketThreads.clear();

    for (map<int, IntervalThread*>::iterator iter = myIntervalThreads.begin(); iter != myIntervalThreads.end(); iter++)
    {
        iter->second->stop();
        delete iter->second;
        //myIntervalThreads.erase(iter);
    }

    myIntervalThreads.clear();
}

void VirtualMachine::run()
{
    myGlobal = ObjectTemplate::New();
    myGlobal->Set(String::New("_quit"), FunctionTemplate::New(VirtualMachine::_quit));
    myGlobal->Set(String::New("_print"), FunctionTemplate::New(VirtualMachine::_print));
    myGlobal->Set(String::New("log"), FunctionTemplate::New(VirtualMachine::_log));
    myGlobal->Set(String::New("sendCanMessage"), FunctionTemplate::New(VirtualMachine::_sendCanMessage));
    myGlobal->Set(String::New("sendCanNMTMessage"), FunctionTemplate::New(VirtualMachine::_sendCanNMTMessage));
    myGlobal->Set(String::New("loadScript"), FunctionTemplate::New(VirtualMachine::_loadScript));
    myGlobal->Set(String::New("startIntervalThread"), FunctionTemplate::New(VirtualMachine::_startIntervalThread));
    myGlobal->Set(String::New("stopIntervalThread"), FunctionTemplate::New(VirtualMachine::_stopIntervalThread));
    myGlobal->Set(String::New("setIntervalThreadTimeout"), FunctionTemplate::New(VirtualMachine::_setIntervalThreadTimeout));
    myGlobal->Set(String::New("startSocketThread"), FunctionTemplate::New(VirtualMachine::_startSocketThread));
    myGlobal->Set(String::New("stopSocketThread"), FunctionTemplate::New(VirtualMachine::_stopSocketThread));
    myGlobal->Set(String::New("sendToSocketThread"), FunctionTemplate::New(VirtualMachine::_sendToSocketThread));
    myGlobal->Set(String::New("loadDataStore"), FunctionTemplate::New(VirtualMachine::_loadDataStore));
    myGlobal->Set(String::New("getFileContents"), FunctionTemplate::New(VirtualMachine::_getFileContents));
    myGlobal->Set(String::New("uint2hex"), FunctionTemplate::New(VirtualMachine::_uint2hex));
    myGlobal->Set(String::New("hex2bin"), FunctionTemplate::New(VirtualMachine::_hex2bin));
    myGlobal->Set(String::New("bin2hex"), FunctionTemplate::New(VirtualMachine::_bin2hex));
    myGlobal->Set(String::New("bin2float"), FunctionTemplate::New(VirtualMachine::_bin2float));
    myGlobal->Set(String::New("float2bin"), FunctionTemplate::New(VirtualMachine::_float2bin));
    myGlobal->Set(String::New("bin2uint"), FunctionTemplate::New(VirtualMachine::_bin2uint));
    myGlobal->Set(String::New("uint2bin"), FunctionTemplate::New(VirtualMachine::_uint2bin));
    myGlobal->Set(String::New("hex2uint"), FunctionTemplate::New(VirtualMachine::_hex2uint));
    myGlobal->Set(String::New("sleep"), FunctionTemplate::New(VirtualMachine::_sleep));
    myContext = Context::New(NULL, myGlobal);


    if (loadScript("System/Base.js"))
    {
        loadScript("System/Startup.js");

        loadScript("Autostart.js");

        Context::Scope contextScope(myContext);

        myFunctionStartup = Handle<Function>::Cast(myContext->Global()->Get(String::New("startup")));
    }
    else
    {
        ///FIXME: We should probably exit the application here
        return;
    }

    const int argc = 0;
    Handle<Value> argv[argc] = { };
    Handle<Value> result = myFunctionStartup->Call(myFunctionStartup, argc, argv);


    string commandPort = Settings::get("CommandPort");
    if (commandPort != "")
    {
        myCommandThread.setSettings(stoi(commandPort), "Command console");
        myCommandThread.start();
    }
    else
    {
        Logger &log = Logger::getInstance();
        log.add("CommandPort is not defined, can not start Command console socket\n");
    }


    mySemaphore.lock();

    while (true)
    {
        while (myExpressions.size() > 0)
        {
            runExpression(myExpressions.pop());
        }

        mySemaphore.wait();
    }

    mySemaphore.unlock();
}

void VirtualMachine::queueExpression(Expression expression)
{
    myExpressions.push(expression);
    mySemaphore.broadcast();
}

string VirtualMachine::formatException(TryCatch* tryCatch)
{
    string result;

    HandleScope handleScope;
    String::Utf8Value exception(tryCatch->Exception());
    Handle<v8::Message> message = tryCatch->Message();

    string strException = *exception;

    if (message.IsEmpty())
    {
        result += strException + "\n";
    }
    else
    {
        String::Utf8Value filename(message->GetScriptResourceName());
        string strFilename = *filename;

        result += strFilename + ":" + itos(message->GetLineNumber()) + ": " + strException + "\n";

        String::Utf8Value sourceline(message->GetSourceLine());
        string strSourceline = *sourceline;

        result += strSourceline + "\n";

        string underline = rpad("", message->GetStartColumn(), ' ');
        underline = rpad(underline, message->GetEndColumn(), '^');

        result += underline + "\n";
    }

    return result;
}

bool VirtualMachine::loadDataStore(string storeName)
{
    Logger &log = Logger::getInstance();

    string basePath = Settings::get("BasePath") + "Services/DataStores/";
    string scriptFileName = basePath + storeName + ".js";

    if (!file_exists(scriptFileName))
    {
        log.add("Failed to load datastore " + scriptFileName + ", file does not exist.\n");
        return false;
    }

    string scriptSource = file_get_contents(scriptFileName);

    scriptSource = "DataStore.addStore('" + storeName + "', " + str_replace("\n", "", scriptSource) + ");";

    Handle<String> source =  String::New(scriptSource.c_str(), scriptSource.length());
    Handle<String> name = String::New(scriptFileName.c_str(), scriptFileName.length());

    Context::Scope contextScope(myContext);

    TryCatch tryCatch;

    Handle<Script> script = Script::Compile(source, name);

    if (script.IsEmpty())
    {
        log.add(formatException(&tryCatch));
        return false;
    }
    else
    {
        Handle<Value> result = script->Run();

        if (result.IsEmpty())
        {
            log.add(formatException(&tryCatch));
            return false;
        }

        log.add("Loaded datastore " + storeName + "\n");
    }

    return true;
}

bool VirtualMachine::loadScript(string scriptName)
{
    Logger &log = Logger::getInstance();

    string basePath = Settings::get("BasePath") + "Services/";
    string scriptFileName = basePath + scriptName;

    if (!file_exists(scriptFileName))
    {
        log.add("Failed to load " + scriptFileName + ", file does not exist.\n");
        return false;
    }

    string scriptSource = file_get_contents(scriptFileName);

    Handle<String> source =  String::New(scriptSource.c_str(), scriptSource.length());
    Handle<String> name = String::New(scriptName.c_str(), scriptName.length());

    Context::Scope contextScope(myContext);

    TryCatch tryCatch;

    Handle<Script> script = Script::Compile(source, name);

    if (script.IsEmpty())
    {
        log.addToSyslog(formatException(&tryCatch));
        return false;
    }
    else
    {
        Handle<Value> result = script->Run();

        if (result.IsEmpty())
        {
            log.addToSyslog(formatException(&tryCatch));
            return false;
        }

        log.add("Loaded " + scriptName + "\n");
    }

    return true;
}

unsigned int VirtualMachine::startIntervalThread(unsigned int timeout)
{
    IntervalThread *intervalThread = new IntervalThread(timeout);

    myIntervalThreads[intervalThread->getId()] = intervalThread;
    myIntervalThreads[intervalThread->getId()]->start();

    return intervalThread->getId();
}

bool VirtualMachine::stopIntervalThread(unsigned int id)
{
    if (myIntervalThreads.find(id) != myIntervalThreads.end())
    {
        myIntervalThreads[id]->stop();
        delete myIntervalThreads[id];
        myIntervalThreads.erase(id);

        return true;
    }

    return false;
}

bool VirtualMachine::setIntervalThreadTimeout(unsigned int id, unsigned int timeout)
{
    if (myIntervalThreads.find(id) != myIntervalThreads.end())
    {
        myIntervalThreads[id]->setTimeout(timeout);
        return true;
    }

    return false;
}

unsigned int VirtualMachine::startSocketThread(string address, int port, unsigned int reconnectTimeout)
{
    SocketThread *socketThread = new SocketThread(address, port, reconnectTimeout);
    mySocketThreads[socketThread->getId()] = socketThread;
    mySocketThreads[socketThread->getId()]->start();
    mySocketThreads[socketThread->getId()]->startSocket();

    return socketThread->getId();
}

bool VirtualMachine::stopSocketThread(unsigned int id)
{
    if (mySocketThreads.find(id) != mySocketThreads.end())
    {
        delete mySocketThreads[id];
        mySocketThreads.erase(id);
        return true;
    }

    return false;
}

void VirtualMachine::sendToSocketThread(unsigned int id, string data)
{
    if (mySocketThreads.find(id) != mySocketThreads.end())
    {
        mySocketThreads[id]->send(data);
    }
}

void VirtualMachine::disconnectCommandClient(unsigned int id)
{
    myCommandThread.disconnectClient(id);
}

void VirtualMachine::sendToCommandClient(unsigned int id, string data)
{
    myCommandThread.sendTo(id, data);
}

void VirtualMachine::print(unsigned int id, string data)
{
    if (id == 0)
    {
        Logger &log = Logger::getInstance();
        log.add(data);
    }
    else
    {
        VirtualMachine &vm = VirtualMachine::getInstance();
        vm.sendToCommandClient(id, data);
    }
}

bool VirtualMachine::runExpression(Expression expression)
{
    string scriptName = "runExpression";

    string scriptData = expression.getScript();

    scriptData = "setClientId(" + itos(expression.getTargetId()) + ");\n" + scriptData + "\n";

    Handle<String> source =  String::New(scriptData.c_str(), scriptData.length());
    Handle<String> name = String::New(scriptName.c_str(), scriptName.length());

    Context::Scope contextScope(myContext);

    TryCatch tryCatch;

    Handle<Script> script = Script::Compile(source, name);

    if (script.IsEmpty())
    {
        print(expression.getTargetId(), formatException(&tryCatch));
        return false;
    }
    else
    {
        Handle<Value> result = script->Run();

        if (result.IsEmpty())
        {
            print(expression.getTargetId(), formatException(&tryCatch));
            return false;
        }
        else if (expression.getTargetId() != 0)
        {
             String::AsciiValue ascii(result);
             string resultString = *ascii;

             if (resultString != "undefined")
             {
                print(expression.getTargetId(), resultString + "\n");
             }
        }
    }

    return true;
}


Handle<Value> VirtualMachine::_quit(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    vm.disconnectCommandClient(args[0]->Uint32Value());

    return Undefined();
}

Handle<Value> VirtualMachine::_log(const Arguments& args)
{
    Logger &log = Logger::getInstance();

    String::AsciiValue str(args[0]);

    log.add(*str);

    return Undefined();
}

Handle<Value> VirtualMachine::_print(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue str(args[1]);

    vm.print(args[0]->Uint32Value(), *str);

    return Undefined();
}

Handle<Value> VirtualMachine::_sendCanMessage(const Arguments& args)
{
    CanNetManager &canMan = CanNetManager::getInstance();

    CanMessage canMessage;

    String::AsciiValue className(args[0]);
    canMessage.setClassName(*className);
    String::AsciiValue directionFlag(args[1]);
    canMessage.setDirectionFlag(*directionFlag);
    String::AsciiValue moduleName(args[2]);
    canMessage.setModuleName(*moduleName);
    canMessage.setModuleId(args[3]->Uint32Value());
    String::AsciiValue commandName(args[4]);
    canMessage.setCommandName(*commandName);

    String::AsciiValue dataString(args[5]);

    vector<string> parts = explode(",", trim(*dataString, ','));
    map<string, CanVariable> data;

    for (int n = 0; n < parts.size(); n++)
    {
        vector<string> keyAndValue = explode(":", parts[n]);

        /* decode base64 on the data part */
        keyAndValue[1] = base64_decode(keyAndValue[1]);

        data[keyAndValue[0]] = CanVariable(keyAndValue[0], keyAndValue[1]);
    }

    canMessage.setData(data);
    
    canMan.sendMessage(canMessage);

    return Undefined();
}

Handle<Value> VirtualMachine::_sendCanNMTMessage(const Arguments& args)
{
    CanNetManager &canMan = CanNetManager::getInstance();

    CanMessage canMessage;

    String::AsciiValue className(args[0]);
    canMessage.setClassName(*className);
    String::AsciiValue commandName(args[1]);
    canMessage.setCommandName(*commandName);

    String::AsciiValue dataString(args[2]);

    vector<string> parts = explode(",", trim(*dataString, ','));
    map<string, CanVariable> data;

    for (int n = 0; n < parts.size(); n++)
    {
        vector<string> keyAndValue = explode(":", parts[n]);

        data[keyAndValue[0]] = CanVariable(keyAndValue[0], keyAndValue[1]);
    }

    canMessage.setData(data);

    canMan.sendMessage(canMessage);

    return Undefined();
}

Handle<Value> VirtualMachine::_loadScript(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue str(args[0]);

    return Boolean::New(vm.loadScript(*str));
}

Handle<Value> VirtualMachine::_loadDataStore(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue str(args[0]);

    return Boolean::New(vm.loadDataStore(*str));
}

Handle<Value> VirtualMachine::_startIntervalThread(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();
    return Integer::New(vm.startIntervalThread(args[0]->Uint32Value()));
}

Handle<Value> VirtualMachine::_stopIntervalThread(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();
    return Boolean::New(vm.stopIntervalThread(args[0]->Uint32Value()));
}

Handle<Value> VirtualMachine::_setIntervalThreadTimeout(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();
    return Integer::New(vm.setIntervalThreadTimeout(args[0]->Uint32Value(), args[1]->Uint32Value()));
}

Handle<Value> VirtualMachine::_startSocketThread(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue address(args[0]);

    return Integer::New(vm.startSocketThread(*address, args[1]->Uint32Value(), args[2]->Uint32Value()));
}

Handle<Value> VirtualMachine::_stopSocketThread(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    return Boolean::New(vm.stopSocketThread(args[0]->Uint32Value()));
}

Handle<Value> VirtualMachine::_sendToSocketThread(const Arguments& args)
{
    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue data(args[1]);

    vm.sendToSocketThread(args[0]->Uint32Value(), *data);

    return Undefined();
}

Handle<Value> VirtualMachine::_getFileContents(const Arguments& args)
{
    String::AsciiValue filename(args[0]);

    if (!file_exists(*filename))
    {
        return Undefined();
    }

    string content = file_get_contents(*filename);

    return String::New(content.c_str());
}

Handle<Value> VirtualMachine::_uint2hex(const Arguments& args)
{
    string hex = uint2hex(args[0]->Uint32Value(), args[1]->Uint32Value());
    return String::New(hex.c_str());
}

Handle<Value> VirtualMachine::_hex2bin(const Arguments& args)
{
    String::AsciiValue hex(args[0]);
    string bin = hex2bin(*hex);
    return String::New(bin.c_str());
}

Handle<Value> VirtualMachine::_bin2hex(const Arguments& args)
{
    String::AsciiValue bin(args[0]);
    string hex = bin2hex(*bin);
    return String::New(hex.c_str());
}

Handle<Value> VirtualMachine::_bin2float(const Arguments& args)
{
    String::AsciiValue bin(args[0]);
    float f = bin2float(*bin);
    return Number::New(f);
}

Handle<Value> VirtualMachine::_float2bin(const Arguments& args)
{
    string bin = float2bin(args[0]->NumberValue(), args[1]->Uint32Value());
    return String::New(bin.c_str());
}

Handle<Value> VirtualMachine::_bin2uint(const Arguments& args)
{
    String::AsciiValue bin(args[0]);
    unsigned int num = bin2uint(*bin);
    return Number::New(num);
}

Handle<Value> VirtualMachine::_uint2bin(const Arguments& args)
{
    string bin = uint2bin(args[0]->Uint32Value(), args[1]->Uint32Value());
    return String::New(bin.c_str());
}

Handle<Value> VirtualMachine::_hex2uint(const Arguments& args)
{
    String::AsciiValue hex(args[0]);
    unsigned int num = hex2uint(*hex);
    return Number::New(num);
}

Handle<Value> VirtualMachine::_sleep(const Arguments& args)
{
    usleep(args[0]->Uint32Value());
    return Undefined();
}