/* 
   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.

   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.  


   ### File Specific:
   main-programmer: Patrick Boenzli
   co-programmer: Christian Meyer
*/

#include "orxonox.h"
#include "world.h"
#include "camera.h"
#include "data_tank.h"
#include "command_node.h"
#include "game_loader.h"
#include <string.h>

using namespace std;

/**
   \brief create a new Orxonox
*/
Orxonox::Orxonox ()
{
  pause = false;
}

/**
   \brief remove Orxonox from memory
*/
Orxonox::~Orxonox () 
{
  Orxonox::singleton_ref = NULL;
  if( world != NULL) delete world;
  if( localinput != NULL) delete world;
  if( localcamera != NULL) delete localcamera;
  if( resources != NULL) delete resources;
}


/* this is a singleton class to prevent duplicates */
Orxonox* Orxonox::singleton_ref = 0;

Orxonox* Orxonox::getInstance (void)
{
  if (singleton_ref == NULL)
    singleton_ref = new Orxonox();
  return singleton_ref;
}

/**
   \brief this finds the config file
   
   Since the config file varies from user to user and since one may want to specify different config files
   for certain occasions or platforms this function finds the right config file for every occasion and stores
   it's path and name into configfilename
*/
void Orxonox::get_config_file (int argc, char** argv)
{
  /*	char* path;
    #ifdef __WIN32__
    path = getenv("");
    #else
    path = getenv("HOME");
    #endif
    
    if( path != NULL) strcpy (configfilename, path);
    else strcpy (configfilename, "./");
    strcat (configfilename, "/.orxonox.conf");*/
  
  strcpy (configfilename, "orxonox.conf");
}

/**
   \brief initialize Orxonox with command line
*/
int Orxonox::init (int argc, char** argv)
{
  // parse command line
  // config file
  
  get_config_file (argc, argv);
  
  // initialize SDL
  printf("> Initializing SDL\n");
  if( SDL_Init (SDL_INIT_VIDEO) == -1)
    {
      printf ("Could not SDL_Init(): %s\n", SDL_GetError());
      return -1;
    }
  
  // initialize everything
  printf("> Initializing video\n");
  if( init_video () == -1) return -1;
  printf("> Initializing sound\n");
  if( init_sound () == -1) return -1;
  printf("> Initializing input\n");
  if( init_input () == -1) return -1;
  printf("> Initializing networking\n");
  if( init_networking () == -1) return -1;
  printf("> Initializing resources\n");
  if( init_resources () == -1) return -1;
  //printf("> Initializing world\n");
  //if( init_world () == -1) return -1; PB: world will be initialized when started
  
  return 0;
}

/**
   \brief initializes SDL and OpenGL
*/
int Orxonox::init_video () 
{
  // Set video mode
  // TO DO: parse arguments for settings
  SDL_GL_SetAttribute (SDL_GL_RED_SIZE, 5);
  SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, 5);
  SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, 5);
  SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, 16);
  
  int bpp = 16;
  int width = 640;
  int height = 480;
  Uint32 flags = SDL_HWSURFACE | SDL_OPENGL | SDL_GL_DOUBLEBUFFER;
  
  if( (screen = SDL_SetVideoMode (width, height, bpp, flags)) == NULL)
  {
    printf ("Could not SDL_SetVideoMode(%d, %d, %d, %d): %s\n", width, height, bpp, flags, SDL_GetError());
    SDL_Quit();
    return -1;
  }
  
  // Set window labeling
  // TO DO: Add version information to caption
  SDL_WM_SetCaption( "Orxonox", "Orxonox");
  
  // TO DO: Create a cool icon and use it here
  // SDL_WM_SetIcon(SDL_Surface *icon, Uint8 *mask);  

  // OpenGL stuff
  // (Is this all we initialize globally???)
  glClearColor(0.0, 0.0, 0.0, 0.0);
  glEnable(GL_DEPTH_TEST);
 
  // LIGHTING
  GLfloat lmodelAmbient[] = {.1, .1, .1, 1.0};
  GLfloat whiteLight[] = {1.0, 1.0, 1.0,1.0};
  GLfloat lightPosition[] = {10.0, 10, 19.0, 0.0};

  glLightfv(GL_LIGHT0, GL_DIFFUSE, whiteLight);
  glLightfv(GL_LIGHT0, GL_SPECULAR, whiteLight);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_DEPTH_TEST);
  glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
  glLightfv(GL_LIGHT0, GL_DIFFUSE, whiteLight);
   
  //  glEnable(GL_COLOR);
  //  glShadeModel(GL_SMOOTH);
  
  // create camera
  localcamera = new Camera(world);
  
  return 0;
}

/**
   \brief initializes the sound engine
*/
int Orxonox::init_sound () 
{
  printf("Not yet implemented\n");
  return 0;
}

/**
   \brief initializes input functions
*/
int Orxonox::init_input () 
{
  // create localinput
  localinput = new CommandNode( configfilename);
  
  return 0;
}

/**
   \brief initializes network system
*/
int Orxonox::init_networking () 
{
  printf("Not yet implemented\n");
  return 0;
}

/**
   \brief initializes and loads resource files
*/
int Orxonox::init_resources () 
{
  printf("Not yet implemented\n");
  return 0;
}

/**
   \brief initializes the world
*/
int Orxonox::init_world () 
{
  //world = new World();
  
  // TO DO: replace this with a menu/intro
  //world->load_debug_level();
  
  return 0;
}


/**
   \brief starts the orxonox game or menu

   here is the central orxonox state manager. There are currently two states
   - menu
   - game-play
   both states manage their states themselfs again.
*/
void Orxonox::start()
{
  
  this->gameLoader = GameLoader::getInstance();
  this->gameLoader->loadDebugCampaign(DEBUG_CAMPAIGN_0);
  this->gameLoader->init();
  this->gameLoader->start();
}

/**
   \brief exits Orxonox
*/
void Orxonox::quitGame() 
{
  bQuitOrxonox = true;
}

/**
   \brief this runs all of Orxonox
*/
void Orxonox::mainLoop()
{
  lastframe = SDL_GetTicks();
  bQuitOrxonox = false;
  // This is where everything is run
  printf("Orxonox|Entering main loop\n");
  while( !bQuitOrxonox)
    {
      // Network
      synchronize();
      // Process input
      handle_input();
      // Process time
      time_slice();
      // Process collision
      collision();
      // Draw
      display();
    }
  printf("Orxonox|Exiting the main loop\n");
}

/**
   \brief handles sprecial events from localinput
   \param event: an event not handled by the CommandNode 
*/
void Orxonox::event_handler (SDL_Event* event)
{
  // Handle special events such as reshape, quit, focus changes
}

/**
   \brief synchronize local data with remote data
*/
void Orxonox::synchronize ()
{
  // Get remote input
  // Update synchronizables
}

/**
   \brief run all input processing
*/
void Orxonox::handle_input ()
{
  // localinput
  localinput->process();
  // remoteinput
}

/**
   \brief advance the timeline
*/
void Orxonox::time_slice ()
{
  Uint32 curframe = SDL_GetTicks();
  if( !pause)
    {
      Uint32 dt = curframe - lastframe;
      
      if(dt > 0)
	{
	  float fps = 1000/dt;
	  printf("fps = %f\n", fps);
	}
      
      world->time_slice (dt);
      world->update ();
      localcamera->time_slice (dt);
    }
  lastframe = curframe;
}

/**
   \brief compute collision detection
*/
void Orxonox::collision ()
{
  world->collide ();
}

/**
   \brief handle keyboard commands that are not meant for WorldEntities
   \param cmd: the command to handle
   \return true if the command was handled by the system or false if it may be passed to the WorldEntities
*/
bool Orxonox::system_command (Command* cmd)
{
  if( !strcmp( cmd->cmd, "quit"))
    {
      if( !cmd->bUp) this->gameLoader->stop();
      return true;
    }
  return false;
}

/**
   \brief render the current frame
*/
void Orxonox::display ()
{
  // clear buffer
  glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  // set camera
  localcamera->apply ();
  // draw world
  world->draw ();
  // draw HUD
  // flip buffers
  SDL_GL_SwapBuffers();
}

/**
   \brief retrieve a pointer to the local Camera
   \return a pointer to localcamera
*/
Camera* Orxonox::get_camera ()
{
  return localcamera;
}

/**
   \brief retrieve a pointer to the local CommandNode
   \return a pointer to localinput
*/
CommandNode* Orxonox::get_localinput ()
{
  return localinput;
}

/**
   \brief retrieve a pointer to the local World
   \return a pointer to world
*/
World* Orxonox::get_world ()
{
  return world;
}

int main (int argc, char** argv) 
{  
  printf(">>> Starting Orxonox <<<\n");
  Orxonox *orx = Orxonox::getInstance();
  
  if( (*orx).init(argc, argv) == -1)
    {
      printf("! Orxonox initialization failed\n");
      return -1;
    }
  
  //(*orx).mainLoop();

  orx->start();
  
  //delete orx;
  
  return 0;
}