source: orxonox.OLD/orxonox/branches/levelloader/src/game_loader.cc @ 3604

/* 
   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 "factory.h"

#include <string.h>


using namespace std;


GameLoader* GameLoader::singletonRef = 0;


GameLoader::GameLoader ()
{
        first = NULL;
}


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.
    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_GAMEEND);
        debugCampaign->addEntity(world1, WORLD_ID_1);

        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.
  */
  
  if( name == NULL)
  {
                PRINTF0("No filename specified for loading");
                return NULL;
  }
  
        TiXmlDocument* XMLDoc = new TiXmlDocument( name);
        // load the campaign document
        if( !XMLDoc->LoadFile())
        {
                // report an error
                PRINTF0("Error loading XML File: %s @ %d:%d\n", XMLDoc->ErrorDesc(), XMLDoc->ErrorRow(), XMLDoc->ErrorCol());
                delete XMLDoc;
                return NULL;
        }
        
        // check basic validity
        TiXmlElement* root = XMLDoc->RootElement();
        assert( root != NULL);
        
        if( strcmp( root->Value(), "Campaign"))
        {
                // report an error
                PRINTF0("Specified XML File is not an orxonox campaign file (Campaign element missing)\n");
                delete XMLDoc;
                return NULL;
        }
        
        // construct campaign
        Campaign* c = new Campaign( root);
        
        // free the XML data
        delete XMLDoc;
        
        return c;
}


/**
   \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;
}