/* 
   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: Patrick Boenzli
   co-programmer: ...
*/


#include "game_loader.h"
#include "campaign.h"
#include "world.h"
#include "player.h"
#include "orxonox.h"
#include "camera.h"
#include "command_node.h"
#include "vector.h"

#include <string.h>


using namespace std;


GameLoader* GameLoader::singletonRef = 0;


GameLoader::GameLoader () {}


GameLoader::~GameLoader () {}


/**
   \brief this class is a singleton class
   \returns an instance of itself

   if you are unsure about singleton classes, check the theory out on the internet :)
*/
GameLoader* GameLoader::getInstance()
{
  if(singletonRef == NULL)
    singletonRef = new GameLoader();
  return singletonRef;
}


ErrorMessage GameLoader::init()
{
  if(this->currentCampaign != NULL)
    this->currentCampaign->init();
}


/**
   \brief reads a campaign definition file into a campaign class
   \param filename to be loaded
   \returns the loaded campaign

   this will interprete the map/campaign files and recursivly load a tree of worlds/campaigns
*/
ErrorMessage GameLoader::loadCampaign(char* name)
{
  ErrorMessage errorCode;
  
  this->currentCampaign = this->fileToCampaign(name);
}


/**
   \brief loads a debug campaign for test purposes only.
   \param the identifier of the campaign.
   \returns error message if not able to do so.
*/
ErrorMessage GameLoader::loadDebugCampaign(Uint32 campaignID)
{
  switch(campaignID)
    {
      /* 
	 Debug Level 0: Debug level used to test the base frame work.
	 As you can see, all storyentity data is allocated before game
	 start. the storyentity will load themselfs shortly before start
	 through the StoryEntity::init() funtion.
      */
    case DEBUG_CAMPAIGN_0:
      {
	Campaign* debugCampaign = new Campaign();

	World* world0 = new World(DEBUG_WORLD_0);
	world0->setNextStoryID(WORLD_ID_1);
	debugCampaign->addEntity(world0, WORLD_ID_0);

	World* world1 = new World(DEBUG_WORLD_1);
	world1->setNextStoryID(WORLD_ID_2);
	debugCampaign->addEntity(world1, WORLD_ID_1);

	World* world2 = new World(DEBUG_WORLD_2);
	world2->setNextStoryID(WORLD_ID_GAMEEND);
	debugCampaign->addEntity(world2, WORLD_ID_2);

	this->currentCampaign = debugCampaign;
	break;
      }
    }
}

ErrorMessage GameLoader::start()
{
  if(this->currentCampaign != NULL)
    this->currentCampaign->start();
}


ErrorMessage GameLoader::stop()
{
  if(this->currentCampaign != NULL)
    this->currentCampaign->stop();
  this->currentCampaign = NULL;
}


ErrorMessage GameLoader::pause()
{
  this->isPaused = true;
  if(this->currentCampaign != NULL)
    this->currentCampaign->pause();
}


ErrorMessage GameLoader::resume()
{
  this->isPaused = false;
  if(this->currentCampaign != NULL)
    this->currentCampaign->resume();
}

/**
   \brief release the mem
 */
ErrorMessage GameLoader::destroy()
{}


/**
   \brief reads a campaign definition file into a campaign class
   \param filename to be loaded
   \returns the loaded campaign

   this will interprete the map/campaign files and recursivly load a tree of worlds/campaigns
*/
Campaign* GameLoader::fileToCampaign(char *name)
{
  /* do not entirely load the campaign. just the current world
     before start of each world, it has to be initialized so it
     can load everything it needs into memory then.
  */
}


/**
   \brief handle keyboard commands 
   \param cmd: the command to handle
   \returns true if the command was handled by the system
*/
bool GameLoader::worldCommand (Command* cmd)
{
  if( !strcmp( cmd->cmd, "up_world"))
    {
      if( !cmd->bUp) 
	{
	  this->nextLevel();
	}
      return true;
    }
  else if( !strcmp( cmd->cmd, "down_world"))
    {
      if( !cmd->bUp)
	{
	  this->previousLevel();
	}
      return true;
    }
  else if( !strcmp( cmd->cmd, "pause"))
    {
      if( !cmd->bUp)
	{
	  if(this->isPaused)
	    this->resume();
	  else
	    this->pause();
	}
      return true;
    }
  else if( !strcmp( cmd->cmd, "quit"))
    {
      if( !cmd->bUp) this->stop();
      return true;
    }
  return false;
}


/*
  \brief this changes to the next level
*/
void GameLoader::nextLevel()
{
  if(this->currentCampaign != NULL)
    this->currentCampaign->nextLevel();
}


/*
  \brief change to the previous level - not implemented

  this propably useless
*/
void GameLoader::previousLevel()
{
  if(this->currentCampaign != NULL)
    this->currentCampaign->previousLevel();
}

/**
   \brief add a Factory to the Factory Q
   \param factory a Factory to be registered
*/
void GameLoader::registerFactory( Factory* factory)
{
	assert( factory != NULL);
	
	PRINTF0("Registered factory for '%s'\n", factory->getClassname());
	
	if( first == NULL) first = factory;
	else first->registerFactory( factory);
}

/**
   \brief load a StoryEntity
   \param element a XMLElement containing all the needed info
*/
BaseObject* GameLoader::fabricate( TiXmlElement* element)
{
	assert( element != NULL);
	
	if( first == NULL)
	{
		PRINTF0("GameLoader does not know any factories, fabricate() failed\n");
		return NULL;
	}
	
	if( element->Value() != NULL)
	{
		PRINTF0("Attempting fabrication of a '%s'\n", element->Value());
		BaseObject* b = first->fabricate( element);
		if( b == NULL) PRINTF0("Failed to fabricate a '%s'\n", element->Value());
		else PRINTF0("Successfully fabricated a '%s'\n", element->Value());
		return b;
	}
	
	PRINTF0("Fabricate failed, TiXmlElement did not contain a value\n");
	
	return NULL;
}