/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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, or (at your option)
   any later version.

### File Specific:
   main-programmer: Silvan Nellen
   co-programmer: Benjamin Grauer
*/

#include "script.h"
#include "script_class.h"
#include "luaincl.h"
#include "debug.h"

#include "loading/resource_manager.h"
#include "loading/load_param.h"
#include "parser/tinyxml/tinyxml.h"

ObjectListDefinition(Script);


Script::Script(const TiXmlElement* root)
{
  this->registerObject(this, Script::_objectList);

  returnCount = argumentCount = 0;

  luaState = lua_open();

  luaopen_base(luaState);
  luaopen_table(luaState);
  luaopen_io(luaState);
  luaopen_string(luaState);
  luaopen_math(luaState);
  luaopen_debug(luaState);
  if (root != NULL)
    this->loadParams(root);
}


Script::Script(const std::string& filename)
{
  this->registerObject(this, Script::_objectList);

  returnCount = argumentCount = 0;

  luaState = lua_open();

  luaopen_base(luaState);
  luaopen_table(luaState);
  luaopen_io(luaState);
  luaopen_string(luaState);
  luaopen_math(luaState);
  luaopen_debug(luaState);

  this->loadFile(filename);

}

Script::~Script()
{
  lua_setgcthreshold(luaState, 0);  // collected garbage
  lua_close(luaState);
}


void Script::loadParams(const TiXmlElement* root)
{
  //printf(("Loading params for %p \n",this);
  BaseObject::loadParams(root);

 LOAD_PARAM_START_CYCLE(root, object);
  {
    LoadParam_CYCLE(object, "object", this, Script, addObject)
       .describe("The name of an object that is needed by a script");
  }
 LOAD_PARAM_END_CYCLE(object);


  LoadParam(root, "file", this, Script, loadFileNoRet)
      .describe("the fileName of the script, that should be loaded into this world")
      .defaultValues("");
}



bool Script::loadFile(const std::string& filename)
 {
   std::string filedest(Resources::ResourceManager::getInstance()->mainGlobalPath().name());

   std::string directory = "";
   std::string file = filename;

   unsigned int seperation =  filename.find_last_of('/');
   if (seperation != std::string::npos)
   {
    directory = filename.substr( 0, seperation+1 );
    file = filename.substr( seperation+1 );
   }
   filedest += "scripts/" + directory + file;

   this->addStandartObjects();
   this->registerStandartClasses();

   if(currentFile.length() != 0)
   {
     printf("ERROR IN SCRIPT %s :   Could not load %s because an other file is already loaded: %s\n",currentFile.c_str(),filename.c_str(), currentFile.c_str());
     return false;
    }

   int error = luaL_loadfile (luaState, filedest.c_str());

   if(error == 0)
   {
     currentFile = file;
     error = lua_pcall(luaState, 0, 0, 0);

     if(error == 0)
     {
      return true;
     }
     else
     {
       reportError(error);
     }

   }
   else
   {
     reportError(error);
   }

   printf("ERROR IN SCRIPT:  Could not load file %s \n",filename.c_str());
   return false;
 }


 void Script::addObject(const std::string& className, const std::string& objectName)
 {
   //printf(("Script %s: I am about to add %s of class %s\n",this->getName(),objectName.c_str(),className.c_str());

   ScriptClass* scriptClass = ScriptClass::objectList().getObject(className);
  // printf(("The script class for %s is at %p \n",className.c_str(),scriptClass);
   WorldObject tmpObj;
   if (scriptClass != NULL)
   {
     tmpObj.type = className;
     if( !classIsRegistered(className) )
     {
       scriptClass->registerClass(this);
     }

     BaseObject* object = ObjectListBase::getBaseObject(className, objectName);
    // printf(("%s is at %p \n",objectName.c_str(),object);
     if (object != NULL && !objectIsAdded(objectName))
     {
        scriptClass->insertObject(this, object, false);
        tmpObj.name = objectName;
        registeredObjects.push_back(tmpObj);
        return;
     }
   }
   printf("ERROR IN SCRIPT %s: Could not add %s of class %s\n",this->currentFile.c_str(),objectName.c_str(),className.c_str());
 }


void Script::addObjectAsName( const std::string& className, const std::string& objectName, const std::string& nameInScript)
 {
   ScriptClass* scriptClass = ScriptClass::objectList().getObject(className);
   WorldObject tmpObj;
   if (scriptClass != NULL)
   {
     tmpObj.type = className;
     if( !classIsRegistered(className) )
     {
       scriptClass->registerClass(this);
     }
     BaseObject* object = ObjectListBase::getBaseObject(className, objectName);
     if (object != NULL && !objectIsAdded(objectName))
     {
        scriptClass->insertObject(this, object,nameInScript, false);
        tmpObj.name = objectName;
        registeredObjects.push_back(tmpObj);
        return;
     }
   }
   printf("ERROR IN SCRIPT %s: Could not add %s of class %s\n",this->currentFile.c_str(),objectName.c_str(),className.c_str());
 }



 bool Script::executeFile()
 {
   PRINTF(2)("script.executeFile is not implemented yet\n");
   /*if(currentFile.length() != 0)
   {
    int error = lua_pcall(luaState, 0, 0, 0);
    if( error == 0)
      return true;
     else
      {
       reportError(error);
       return false;
      }
 }*/
   return false;
 }

 bool Script::selectFunction(const std::string& functionName, int retCount)
 {
   if(returnCount == 0 && currentFunction.length() == 0) //no return values left on the stack and no other function selected
   {
   lua_pushlstring(luaState, functionName.c_str(), functionName.size() );
   lua_gettable(luaState, LUA_GLOBALSINDEX);

   if(lua_isfunction( luaState , -1))
   {
     returnCount = retCount;
     argumentCount = 0;
     currentFunction = functionName;
     return true;
   }
   else
    return false;
   }
   else
     printf("ERROR IN SCRIPT %s :   There is an other function active ( %s ) or there are unremoved return values on the stack. Please remove them first.\n",currentFile.c_str(),currentFunction.c_str());
   return false;
 }

 //return number of returned values
 bool Script::executeFunction()
 {
   if(currentFunction.length() != 0 )
   {
    int error = lua_pcall(luaState, argumentCount, returnCount,0);
    if(error != 0)
    {
      PRINTF(1)("Script '%s' : Failed to execute function '%s': \n",currentFile.c_str(),currentFunction.c_str());
     reportError(error);
     //clean up
     currentFunction.assign("");
     argumentCount = returnCount = 0;
     return false;
    }
    else
    {
      currentFunction.assign("");//a function gets unusable after beeing called for the first time
      argumentCount = 0;
      return true;
    }
   }
   else
     PRINTF(1)("SCRIPT '%s' : No function selected.\n",currentFile.c_str());

   return false;
 }


 //overload this function to add different types
 bool Script::pushParam(int param, std::string& toFunction)
 {
   if(currentFunction == toFunction)
   {
     lua_pushnumber(luaState, (lua_Number) param);
     argumentCount++;
     return true;
   }
   else
   {
     printf("ERROR IN SCRIPT %s :   Couldn't add parameter because the wrong function is selected: %s instead of %s\n",currentFile.c_str(), currentFunction.c_str(), toFunction.c_str());
    return false;
   }

 }


 bool Script::pushParam(float param, std::string& toFunction)
 {
   if(currentFunction.compare(toFunction) == 0)
   {
     lua_pushnumber(luaState,(lua_Number) param);
     argumentCount++;
     return true;
   }
   else
   {
     printf("ERROR IN SCRIPT %s :   Couldn't add parameter because the wrong function is selected: %s instead of %s\n",currentFile.c_str(), currentFunction.c_str(), toFunction.c_str());
     return false;
   }

 }

 bool Script::pushParam(double param, std::string& toFunction)
 {
   if(currentFunction.compare(toFunction) == 0)
   {
     lua_pushnumber(luaState,(lua_Number) param);
     argumentCount++;
     return true;
   }
   else
   {
     printf("ERROR IN SCRIPT %s :  Couldn't add parameter because the wrong function is selected: %s instead of %s\n",currentFile.c_str(), currentFunction.c_str(), toFunction.c_str());
     return false;
   }

 }

 int Script::getReturnedInt()
 {
   int returnValue = 0;
   if(returnCount > 0)
   {
     if(lua_isnumber(luaState, -1*returnCount))
     {
       returnValue = (int)lua_tonumber(luaState, -1*returnCount);
       lua_remove(luaState,-1*returnCount);
       returnCount--;

     }
   }
   return returnValue;
 }


 bool Script::getReturnedBool()
 {
   bool returnValue = false;
   if(returnCount > 0)
   {
     if(lua_isboolean(luaState, -1*returnCount))
     {
       returnValue = (bool)lua_toboolean(luaState, -1*returnCount);
       lua_remove(luaState,-1*returnCount);
       returnCount--;
     }
     else
       printf("ERROR IN SCRIPT %s :  Trying to retreive non bolean value\n",this->currentFile.c_str());
   }
   return returnValue;
 }

float Script::getReturnedFloat()
 {
   float returnValue = 0.0f;
   if(returnCount > 0)
   {
     if(lua_isnumber(luaState, -1*returnCount))
     {
       returnValue = (float)lua_tonumber(luaState, -1*returnCount);
       lua_remove(luaState,-1*returnCount);
       returnCount--;
     }
   }
   return returnValue;
 }

 void Script::getReturnedString(std::string& string)
 {
   const char* returnValue = "";
   if(returnCount > 0)
   {
     if(lua_isstring(luaState, -1*returnCount))
     {
       returnValue = lua_tostring(luaState, -1*returnCount);
       lua_remove(luaState,-1*returnCount);
       returnCount--;
     }
   }
  string.assign(returnValue);
 }


void Script::addThisScript()
{
  ScriptClass* scriptClass = ScriptClass::objectList().getObject("Script");

  if (scriptClass != NULL)
   {
     scriptClass->registerClass(this);
     scriptClass->insertObject(this, this,"thisscript", false);
   }
}

 int Script::reportError(int error)
 {
 if(error != 0)
 {
  const char *msg = lua_tostring(luaState, -1);
  if (msg == NULL) msg = "(error with no message)\n";
  printf("ERROR IN SCRIPT %s : %s\n",currentFile.c_str(), msg);
  lua_pop(luaState, 1);
 }
  return error;
 }

 bool Script::registerStandartClasses()
 {
   bool success = false;

    this->registerClass("SpaceTrigger");
    this->registerClass("TickTrigger");
    this->registerClass("TimeTrigger");

   return success;
 }

bool Script::addStandartObjects()
 {
   bool success = true;

   this->addThisScript();

   return success;
 }


 void Script::registerClass( const std::string& className)
 {
   ScriptClass* scriptClass = ScriptClass::objectList().getObject(className);
   //printf(("The script class for %s is at %p \n",className.c_str(),scriptClass);

   WorldObject tmpObj;
   if (scriptClass != NULL)
   {
     tmpObj.type = className;
     if( !classIsRegistered(className) )
     {
       static_cast<ScriptClass*>(scriptClass)->registerClass(this);
       tmpObj.name = "";
       registeredObjects.push_back(tmpObj);
       return;
     }
   }

 }

 bool Script::classIsRegistered(const std::string& type)
 {
   for(std::list<WorldObject>::const_iterator it = registeredObjects.begin(); it != registeredObjects.end(); it++ )
   {
     if( (*it).type == type)
     {
       return true;
     }
   }
   return false;
 }



 bool Script::objectIsAdded(const std::string& name)
 {
   for(std::list<WorldObject>::const_iterator it = registeredObjects.begin(); it != registeredObjects.end(); it++ )
   {
     if( (*it).name == name)
     {
       return true;
     }
   }
   return false;


 }