/*------------------------------------------------------------------------------
  
  File        : tetris.cpp

  Description : A CImg version of the famous Tetris game

  Copyright  : David Tschumperle - http://www.greyc.ensicaen.fr/~dtschump/
    
  This software is governed by the CeCILL  license under French law and
  abiding by the rules of distribution of free software.  You can  use, 
  modify and/ or redistribute the software under the terms of the CeCILL
  license as circulated by CEA, CNRS and INRIA at the following URL
  "http://www.cecill.info". 
  
  As a counterpart to the access to the source code and  rights to copy,
  modify and redistribute granted by the license, users are provided only
  with a limited warranty  and the software's author,  the holder of the
  economic rights,  and the successive licensors  have only  limited
  liability. 
  
  In this respect, the user's attention is drawn to the risks associated
  with loading,  using,  modifying and/or developing or reproducing the
  software by the user in light of its specific status of free software,
  that may mean  that it is complicated to manipulate,  and  that  also
  therefore means  that it is reserved for developers  and  experienced
  professionals having in-depth computer knowledge. Users are therefore
  encouraged to load and test the software's suitability as regards their
  requirements in conditions enabling the security of their systems and/or 
  data to be ensured and,  more generally, to use and operate it in the 
  same conditions as regards security. 
  
  The fact that you are presently reading this means that you have had
  knowledge of the CeCILL license and that you accept its terms.
  
  -----------------------------------------------------------------------------*/

#include "../CImg.h"
using namespace cimg_library;

// Allow the compilation of the source with compilers that do not respect the C++ standart.
#if ( defined(_MSC_VER) && _MSC_VER<=1200 ) || defined(__DMC__)
#define std
#endif

// Begin the main procedure
//-------------------------
int main(int argc,char **argv) {

  // Read command line argument (if any)
  cimg_usage("An implementation of the well known 'Tetris' game with CImg.");
  unsigned int 
    blocdim = cimg_option("-blocdim",18,"Sprite bloc size"),
    speed   = cimg_option("-speed",20,"Initial speed"),
    level   = cimg_option("-level",0,"Level");
  const char *geometry = cimg_option("-g","12x20","Size of the board");
  unsigned int bwidth = 12,bheight = 20; 
  std::sscanf(geometry,"%u%*c%u",&bwidth,&bheight);

  CImg<unsigned char> dlogo = CImg<unsigned char>("img/logo.ppm").resize(128,96);
  if (cimg::dialog("CImg Tetris",
		   "Welcome to the CImg version of Tetris.\n"
		   "( by David Tschumperlé )\n\n"
		   "Press 'Start' when you are ready to play !","Start","Quit",0,0,0,0,dlogo,true)) std::exit(0);
  
  // Create sprite, background graphics and initial board data
  const CImgl<unsigned char> pieces = CImgl<unsigned char>().
    insert(CImg<unsigned char>(3,2).fill(1,1,1,0,0,1)).
    insert(CImg<unsigned char>(3,2).fill(2,2,2,2,0,0)).
    insert(CImg<unsigned char>(2,2).fill(3,3,3,3)).
    insert(CImg<unsigned char>(4,1).fill(4,4,4,4)).
    insert(CImg<unsigned char>(3,2).fill(5,5,0,0,5,5)).
    insert(CImg<unsigned char>(3,2).fill(0,6,6,6,6,0)).
    insert(CImg<unsigned char>(3,3).fill(0,7,0,7,7,7,0,7,0)).
    insert(CImg<unsigned char>(2,1).fill(8,8)).
    insert(CImg<unsigned char>(3,2).fill(9,9,9,0,9,0)).
    insert(CImg<unsigned char>(2,2).fill(10,10,0,10)).
    insert(CImg<unsigned char>(3,1).fill(11,11,11));

  CImg<unsigned char> board(bwidth,bheight,1,1,0), background(board.dimx()*blocdim,board.dimy()*blocdim,1,3,0);
  (background.noise(30).draw_plasma().noise(30).deriche(10,0,'y'))/=3;
  if (level) (board.get_shared_lines(board.dimy()-level,board.dimy()-1,0,0).noise(100))%=pieces.size+1;  

  // Create a set of small gradient-colored blocs used to draw the pieces.
  CImgl<unsigned char> blocs(pieces.size,blocdim,blocdim,1,3);
  cimgl_map(blocs,l) {
    CImg<unsigned char> color = CImg<unsigned char>(3).fill(0).noise(255,1).cut(150,255);
    float val;
    cimg_mapXYV(blocs[l],x,y,k) blocs[l](x,y,k) = (unsigned char)((val=(color[k]*0.7f*(x+y+5)/blocdim))>255?255:val);
    blocs[l].draw_line(0,0,0,blocdim-1,(color/2).ptr()).draw_line(0,blocdim-1,blocdim-1,blocdim-1,(color/2).ptr());
    color = (CImg<unsigned int>(color)*2).cut(0,255);
    blocs[l].draw_line(0,0,blocdim-1,0,color.ptr()).draw_line(blocdim-1,0,blocdim-1,blocdim-1,color.ptr());
  }
  
  // Initialize window display and enter the main event loop
  CImgDisplay disp(background,"CImg Tetris",0,3,false,true);
  disp.move((CImgDisplay::screen_dimx()-disp.dimx())/2,
	    (CImgDisplay::screen_dimy()-disp.dimy())/2);
  const unsigned char white[3]={ 255, 255, 255 };
  CImg<unsigned char> visu, nboard, piece, next, next_mask;
  int cx=-1,cy=-1,cn=-1,nn=rand()%pieces.size,time=0, score=0;
  bool gameover = false, pause = false;

  while (!gameover && !disp.is_closed && disp.key!=cimg::keyESC && disp.key!=cimg::keyQ) {
    
    if (!pause) {

      // Draw the board on the display window.
      nboard = board; visu = background;
      if (cx>=0 && cy>=0) cimg_mapXY(piece,x,y) if (piece(x,y)) nboard(cx-piece.dimx()/2+x,cy-piece.dimy()/2+y)=piece(x,y);
      cimg_mapXY(board,xx,yy) if (nboard(xx,yy)) visu.draw_image(blocs[nboard(xx,yy)-1],xx*blocdim,yy*blocdim);
      visu.draw_text(5,5,white,0,11,1,"Lines : %d",score,nn).draw_text(visu.dimx()-75,5,white,0,11,1,"Next :");
      if (next.data) visu.draw_image(next,next_mask,visu.dimx()-next.dimx()-2,10-next.dimy()/2).display(disp.wait(20));
      
      if (cn<0) {

        // Introduce a new piece on the board (if necessary) and create representation of the next piece
        board = nboard;
        piece = pieces[cn=nn];
        nn = rand()%pieces.size;
        cx = board.dimx()/2;
        cy = piece.dimy()/2;
        next = CImg<unsigned char>(pieces[nn].dimx()*blocdim,pieces[nn].dimy()*blocdim,1,3,0);
        cimg_mapXY(pieces[nn],xi,yi) if (pieces[nn](xi,yi)) next.draw_image(blocs[pieces[nn](xi,yi)-1],xi*blocdim,yi*blocdim);
        next_mask = next.resize(-50,-50).get_norm_pointwise().threshold(0);

        // Detect tetris lines and do line removal animation if found.
        cimg_mapY(board,yyy) {
          int Y = yyy*blocdim, line = 1;
          cimg_mapX(board,xxx) if (!board(xxx,yyy)) line=0;
          if (line) {
            board.draw_image(board.get_crop(0,0,board.dimx()-1,yyy-1),0,1);
            if (!((++score)%1) && speed>1) --speed;
            for (float alpha=0; alpha<=1; alpha+=0.07f)
              CImg<unsigned char>(visu).draw_image(background.get_crop(0,Y,visu.dimx()-1,Y+blocdim-1),0,Y,0,0,alpha).display(disp.wait(20));
            visu.draw_image(background.get_crop(0,Y,visu.dimx()-1,Y+blocdim-1),0,Y,0,0);
          }
        }
      }
      
      // Handle motion & collisions
      const int ox=cx, oy=cy;
      bool rotated = false, collision;
      switch (disp.key) {
      case cimg::keyP:          pause = true; break;
      case cimg::keyARROWUP:    piece.rotate(90); rotated = true; disp.key=0; break;
      case cimg::keyARROWLEFT:  cx--;  disp.key=0; break;
      case cimg::keyARROWRIGHT: cx++;  disp.key=0; break;
      }
      if (cx-piece.dimx()/2<0) cx=piece.dimx()/2;
      if (cy-piece.dimy()/2<0) cy=piece.dimy()/2;
      if (cx+(piece.dimx()-1)/2>=board.dimx()) cx = board.dimx()-1-(piece.dimx()-1)/2;

      // Detect collision along the X axis
      collision = false; cimg_mapXY(piece,i,j) if (piece(i,j) && board(cx-piece.dimx()/2+i,cy-piece.dimy()/2+j)) collision = true;
      if (collision) { cx=ox; if (rotated) piece.rotate(-90); }
      
      if (disp.key==cimg::keyARROWDOWN || !((++time)%speed)) { cy++; disp.key=0; }
      // Detect collisiong along the Y axis
      collision = false; cimg_mapXY(piece,ii,jj) if (piece(ii,jj) && board(cx-piece.dimx()/2+ii,cy-piece.dimy()/2+jj)) collision = true;
      if (collision || cy+(piece.dimy()-1)/2>=board.dimy()) { cy = oy; cn=-1; }
      if (collision && cy==piece.dimy()/2) gameover=true;
    } else {

      // If game is paused (key 'P'), do a little text animation
      float A = 0, B = 0;
      CImg<float> pauselogo = CImg<unsigned char>().draw_text("Game Paused\nPress a key",0,0,white);
      disp.key=0; while (!disp.key && !disp.is_closed) {
        const CImg<float> pauserotated = pauselogo.get_rotate((float)(30*std::sin(A)),5).
	  resize((int)(-150-80*std::sin(B)),(int)(-150-80*std::sin(B)));
	A+=0.08f; B+=0.043f;
#if ( !defined(_MSC_VER) || _MSC_VER>1200 )
	CImg<unsigned char>(background).
	  draw_image<float,float>(pauserotated.get_resize(-100,-100,1,3,2),pauserotated,
				  (background.dimx()-pauserotated.dimx())/2,(background.dimy()-pauserotated.dimy())/2,0,0,255).display(disp.wait(20));
#else
	CImg<unsigned char>(background).
          draw_image(pauserotated.get_resize(-100,-100,1,3,2),
                     (background.dimx()-pauserotated.dimx())/2,(background.dimy()-pauserotated.dimy())/2,0,0,255).display(disp.wait(20));
#endif
	if (disp.is_resized) disp.resize();
      }
      disp.key=0;
      pause = false;
    }
    background.scroll(0,20/speed,0,0,2);
    if (disp.is_resized) disp.resize();
  }

  // End of game reached, display the score and do a 'game over' animation
  cimg_mapXYV(visu,x,y,k) if (x%2 || y%2) visu(x,y,k) = 0;
  visu.display(disp);
  char tmp[1024];
  std::sprintf(tmp,"Game Over !\n\nYour score : %d",score);
  cimg::dialog("CImg Tetris",tmp,"Quit");
  return 0;
}
