/* 
   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 "glmenu_imagescreen.h"

#include "graphics_engine.h"
#include "material.h"
#include "factory.h"

CREATE_FACTORY(GLMenuImageScreen);


using namespace std;
/**
   \brief standard constructor
*/
GLMenuImageScreen::GLMenuImageScreen () 
{
   this->init();
}

/**
   \param root The Element to load the GLMenu from
*/
GLMenuImageScreen::GLMenuImageScreen(const TiXmlElement* root)
{
  this->init();
  this->loadParams(root);
}

/**
   \brief Loads a GLMenu from an inputElement
   \param root The Element to load the GLMenu from

   Tags are:
   \li BackgroundImage STRING: the background Image
   \li BarImage: STRING: the Image on the Bar
   \li BackgroundPS: FLOAT FLOAT FLOAT FLOAT: posX posY scaleX scaleY
   \li BarPS: FLOAT FLOAT FLOAT FLOAT: posX posY scaleX scaleY
   \li ElementCount: INT: how many elements will be loaded
*/
void GLMenuImageScreen::loadParams(const TiXmlElement* root)
{
  LoadParam<GLMenuImageScreen>(root, "BackgroundImage", this, &GLMenuImageScreen::setBackgroundImage)
    .describe("sets the image to load onto the loadscreen");

  LoadParam<GLMenuImageScreen>(root, "BackgroundPS", this, &GLMenuImageScreen::setPosScale)
    .describe("The Position and Scale of the Background Image in %(0-1.0). PosX, PosY, SizeX, SizeY");

  LoadParam<GLMenuImageScreen>(root, "BarImage", this, &GLMenuImageScreen::setBarImage)
    .describe("sets the image of the LoadingBar");
  
  LoadParam<GLMenuImageScreen>(root, "BarPS", this, &GLMenuImageScreen::setBarPosScale)
    .describe("The Position and Scale of the Loading Bar in %(0-1.0). PosX, PosY, SizeX, SizeY");

  LoadParam<GLMenuImageScreen>(root, "ElementCount", this, &GLMenuImageScreen::setMaximum)
    .describe("The Count of elements to load into the bar (this is only a maximum value)");
}

/**
   \brief standard deconstructor
   \todo this deconstructor is not jet implemented - do it
*/
GLMenuImageScreen::~GLMenuImageScreen() 
{
  delete this->backMat;
  delete this->barMat;
}

/**
   \brief function to init the screen
*/
void GLMenuImageScreen::init ()
{
  this->setClassID(CL_GLMENU_IMAGE_SCREEN, "GLMenuImageScreen");

  // Select Our VU Meter Background Texture
  this->backMat = new Material("load_screen");
  this->barMat = new Material("bar");
  this->maxValue = 10;
  this->currentValue = 0;
  this->setPosition(0,0);
  this->setScale(1,1);
  this->setBarPosScale( .6, .75, .3, .1);
  // End of Background image code.
}

/** 
    \brief sets the background image name
    \param file name of the backgroun-image
 */
void GLMenuImageScreen::setBackgroundImage (const char* backImageName)
{
  this->backMat->setDiffuseMap(backImageName);
}


/**
   \brief sets position of the ImageScreen
   \param x offset from the top left corner in percent(0-1) of the screensize
   \param y offset from the top left corner in percent(0-1) of the screensize
*/
void GLMenuImageScreen::setPosition(float offsetX, float offsetY)
{
  this->offsetX = offsetX;
  this->offsetY = offsetY;
}


/*
  \brief sets size of the ImageScreen
  \param scaleX the scaleing of the image into the x-direction (in percent (0-1))
  \param scaleY the scaleing of the image into the y-direction (in percent (0-1))
*/
void GLMenuImageScreen::setScale(float scaleX, float scaleY)
{
  this->scaleX = scaleX;
  this->scaleY = scaleY;
}

/*
  \brief sets position and size of the ImageScreen
  \param x offset from the top left corner in percent(0-1) of the screensize
  \param y offset from the top left corner in percent(0-1) of the screensize
  \param scaleX the scaleing of the image into the x-direction (in percent (0-1))
  \param scaleY the scaleing of the image into the y-direction (in percent (0-1))
*/
void GLMenuImageScreen::setPosScale(float offsetX, float offsetY, float scaleX, float scaleY)
{
  this->setPosition(offsetX, offsetY);
  this->setScale(scaleX, scaleY);
}

/**
   \param barImage An image for the Bar
*/
void GLMenuImageScreen::setBarImage(const char* barImage)
{
  this->barMat->setDiffuseMap(barImage);
}

/**
   \brief sets the Position and the Size of the bar
   \param barX The Position in the x-direction in percent of the screen (0-1)
   \param barY The Position in the y-direction in percent of the screen (0-1)
   \param barW The Size in the x-direction in percent of the screen (0-1)
   \param barH The Size in the y-direction in percent of the screen (0-1)
*/
void GLMenuImageScreen::setBarPosScale(float barX, float barY, float barW, float barH)
{
  this->barX = barX;
  this->barY = barY;
  this->barW = barW;
  this->barH = barH;
}


/**
   \brief set the maximum of countable steps
   \param maximum of steps
*/
void GLMenuImageScreen::setMaximum(int maxValue)
{
  this->maxValue = maxValue;
}


/**
   \brief gets the maximum of countable steps
*/
int GLMenuImageScreen::getMaximum()
{
  return this->maxValue;
}


/**
   \brief set current value
   \param current value
*/
void GLMenuImageScreen::setValue(int currentValue)
{
  this->currentValue = currentValue;
  this->draw();
}


/**
   \brief get the current value
 */
int GLMenuImageScreen::getValue()
{
  return this->currentValue;
}


/** 
    \brief call this to trigger a progress event
    
    this has to redraw the progress bar and the whole image
 */
void GLMenuImageScreen::step ()
{
  this->currentValue++;
  this->draw();
}



/**
   \brief draws the ImageScreen to the screenbuffer
*/
void GLMenuImageScreen::draw ()
{
  glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

  PRINTF(4)("GLMenuImagEscreen::draw() - drawing step %i/%i\n", 
	    this->currentValue, this->maxValue);

  /* screen size */
  int screenWidth = GraphicsEngine::getInstance()->getResolutionX();
  int screenHeight = GraphicsEngine::getInstance()->getResolutionY();
  
  int imageWidth = (int)(screenWidth * this->scaleX);
  int imageHeight = (int)(screenHeight * this->scaleY);

  int offsetX = (int)(this->offsetX * screenWidth);
  int offsetY = (int)(this->offsetY * screenHeight);

  /* loadbar pos */
  int barX = (int)(this->barX *screenWidth);
  int barY = (int)(this->barY *screenHeight);
  int barW = (int)(this->barW *screenWidth);
  int barH = (int)(this->barH *screenHeight);
  
  float val = (float)this->currentValue/(float)this->maxValue;
		  
  if( val > barW)
    val = barW;

  GraphicsEngine::enter2DMode();

  /* draw the BackGround */
  backMat->select();
  glBegin(GL_TRIANGLE_STRIP);
  glTexCoord2i(0, 0); glVertex2i(offsetX, offsetY + imageHeight);
  glTexCoord2i(1, 0); glVertex2i(offsetX +imageWidth, offsetY + imageHeight);
  glTexCoord2i(0, 1); glVertex2i(offsetX, offsetY);
  glTexCoord2i(1, 1); glVertex2i(offsetX + imageWidth, offsetY);
  glEnd();
  
  glDisable(GL_TEXTURE_2D);
  /* draw white border */
  glBegin(GL_LINE_LOOP);
  glColor3f(1.0, 1.0, 1.0);
  glVertex2i(barX - 2, barY - 2);
  glVertex2i(barX + barW + 2, barY - 2);
  glVertex2i(barX + barW + 2, barY + barH + 2);
  glVertex2i(barX - 2, barY + barH + 2);
  glColor3f(1.0, 1.0, 1.0);
  glEnd();
  
  /* draw the progress bar */
  barMat->select();
  glBegin(GL_TRIANGLE_STRIP);
  glTexCoord2f(0, 0); glVertex2i(barX, barY + barH);
  glTexCoord2f(val, 0); glVertex2i(barX + (int)(val * this->barW * (float)screenWidth), barY + barH);
  glTexCoord2f(0, 1); glVertex2i(barX, barY);
  glTexCoord2f(val, 1); glVertex2i(barX + (int)(val * this->barW * (float)screenWidth), barY);
  glEnd();

  /*
    glBegin(GL_QUADS);
    glColor3f(0.0, 0.0, 0.0);
    glVertex2i(barX, barY);
    glVertex2i(barX + barWidth, barY);
    glVertex2i(barX + barWidth, barY + barHeight);
    glVertex2i(barX, barY + barHeight);
    glColor3f(1.0, 1.0, 1.0);
    glEnd();
    
    /* draw black border 
    glBegin(GL_QUADS);
    glColor3f(0.0, 0.0, 0.0);
    glVertex2i(barX-1, barY-1);
    glVertex2i(barX + barWidth +1, barY-1);
    glVertex2i(barX + barWidth+1, barY + barHeight+1);
    glVertex2i(barX - 1, barY + barHeight +1);
    glColor3f(1.0, 1.0, 1.0);
    glEnd();
    
  */

  GraphicsEngine::leave2DMode();

  SDL_GL_SwapBuffers();              
}