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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<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("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("uint2hex"), FunctionTemplate::New(VirtualMachine::_uint2hex));

    myGlobal->Set(String::New("loadDataStore"), FunctionTemplate::New(VirtualMachine::_loadDataStore));

    myGlobal->Set(String::New("getFileContents"), FunctionTemplate::New(VirtualMachine::_getFileContents));

    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

    {

        SyslogStream &slog = SyslogStream::getInstance();

        slog << "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)

{

    SyslogStream &slog = SyslogStream::getInstance();

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

    string scriptFileName = basePath + storeName + ".js";

    if (!file_exists(scriptFileName))

    {

        slog << "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())

    {

        slog << formatException(&tryCatch);

        return false;

    }

    else

    {

        Handle<Value> result = script->Run();

        if (result.IsEmpty())

        {

            slog << formatException(&tryCatch);

            return false;

        }

        slog << "Loaded datastore " + storeName + "\n";

    }

    return true;

}

bool VirtualMachine::loadScript(string scriptName)

{

    SyslogStream &slog = SyslogStream::getInstance();

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

    string scriptFileName = basePath + scriptName;

    if (!file_exists(scriptFileName))

    {

        slog << "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())

    {

        slog << formatException(&tryCatch);

        return false;

    }

    else

    {

        Handle<Value> result = script->Run();

        if (result.IsEmpty())

        {

            slog << formatException(&tryCatch);

            return false;

        }

        slog << "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())

    {

        delete myIntervalThreads[id];

        myIntervalThreads.erase(id);

        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();

    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)

    {

        SyslogStream &slog = SyslogStream::getInstance();

        slog << 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)

{

    SyslogStream &slog = SyslogStream::getInstance();

    String::AsciiValue str(args[0]);

    slog << *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]);

        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::_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::_uint2hex(const Arguments& args)

{

    VirtualMachine &vm = VirtualMachine::getInstance();

    string hexId = uint2hex(args[0]->Uint32Value(), args[1]->Uint32Value());

    return String::New(hexId.c_str());

}

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());

}