void setup(){
  size(512,512);
  frameRate(30);
  loadPixels();
  colorMode(HSB, 255,100,100);
  InputStream in = createInput("region.xaero");
  try{

    int minorSaveVersion = -1;
    int majorSaveVersion = 0;
    int firstByte = in.read();
    if(firstByte == 255){
      int fullVersion = readInt(in);
      println("version " + fullVersion);
      minorSaveVersion = fullVersion & 65535;
      majorSaveVersion = (fullVersion >> 16) & 65535;
      println("major version " + majorSaveVersion);
      println("minor version " + minorSaveVersion);
      firstByte = -1;
    }

    while (true) {
      int sectionCoords = firstByte == -1 ? in.read() : firstByte;
      if(sectionCoords == -1){//end reached
        print("end reached");
        break;
      }
      firstByte = -1;
      //section coordinates inside the region
      int sectionX = sectionCoords >> 4;
      int sectionZ = sectionCoords & 15;
      println("section "+sectionX+", "+sectionZ);

      //start reading the section
      int chunks = 0;
      for (int chunkX = 0; chunkX < 4; chunkX++){
        for (int chunkZ = 0; chunkZ < 4; chunkZ++) {
          chunks++;
          int firstPixelInfo = readInt(in); //info for the first chunk pixel
          if (firstPixelInfo == -1){ //-1 if the chunk is empty
            println("chunk "+chunks+" empty at "+chunkX+", "+chunkZ+" ");
            continue;
          }
          //println("chunk "+chunks+" found at "+chunkX+", "+chunkZ+" with pixelinfo: ng:"+(firstPixelInfo & 1)+" oh:"+(firstPixelInfo & 64)+" ol:"+(firstPixelInfo & 2)+" ct:"+((firstPixelInfo>>2) & 3)+" cv:"+(firstPixelInfo & 128)+" li:"+((firstPixelInfo>>8) & 15)+" ");
          println("chunk "+chunks+" found at "+chunkX+", "+chunkZ);
          for (int x = 0; x < 16; x++) {
            for (int z = 0; z < 16; z++) {
              int info;
              if(x==0&&z==0){
                info = firstPixelInfo;
              }else{
                info = readInt(in);
              }
              int col = readPixel(x,z, info, in);
              set(((sectionX*64)+(chunkX*16)+x),((sectionZ*64)+(chunkZ*16)+z),color(col,100,100));
            }
          }


          fill(color(0));
          strokeWeight(1);
          //text("x",((sectionX*64)+(chunkX*16))+5,((sectionZ*64)+(chunkZ*16))+9);
          line(sectionX*64+(chunkX*16),sectionZ*64+(chunkZ*16),sectionX*64+(chunkX*16)+16,sectionZ*64+(chunkZ*16));
          line(sectionX*64+(chunkX*16)+16,sectionZ*64+(chunkZ*16),sectionX*64+(chunkX*16)+16,sectionZ*64+(chunkZ*16)+16);
          line(sectionX*64+(chunkX*16)+16,sectionZ*64+(chunkZ*16)+16,sectionX*64+(chunkX*16),sectionZ*64+(chunkZ*16)+16);
          line(sectionX*64+(chunkX*16),sectionZ*64+(chunkZ*16)+16,sectionX*64+(chunkX*16),sectionZ*64+(chunkZ*16));//fuck me
        }}
       fill(color(64,100,100));
       strokeWeight(2);
       text(""+sectionX+"|"+sectionZ,(sectionX*64)+1,(sectionZ*64)+12);
       line((sectionX*64),(sectionZ*64),(sectionX*64)+64,(sectionZ*64));
       line((sectionX*64)+64,(sectionZ*64),(sectionX*64)+64,(sectionZ*64)+64);
       line((sectionX*64)+64,(sectionZ*64)+64,(sectionX*64),(sectionZ*64)+64);
       line((sectionX*64),(sectionZ*64)+64,(sectionX*64),(sectionZ*64));

      }

  }catch(IOException e){
    e.printStackTrace();
  }

  //updatePixels();


}


int readPixel(int x, int z, int info, InputStream in){
 int col = 0;
 try{
              if ((info & 1) != 0) { // it isn't grass, so read 4 bytes???
                int state = readInt(in);
              }


              int heightType = (info >> 4) & 3;//0 - no slope, 1 - bright slope, 2 - dark slope, 3 - unknown slope
              int heigt;
              if ((info & 64) != 0){//old height, read a byte.
                heigt = in.read();
              }else{
                heigt = (info >> 12) & 255;
              }
              if ((info & 2) != 0) {// has overlays, for example water and ice, read a byte.
                int amount = in.read();
                for (int i = 0; i < amount; i++)
                {
                  readOverlay(in,info);
                }
                int colorType = (info >> 2) & 3;//0 - normal, 1 - grass, 2 - foliage, 3 - custom color
                int customColorMultiplier = -1;
                int biome = 0;
                if (colorType == 3) // read 4 bytes
                  customColorMultiplier = readInt(in);
                if(colorType != 0 && colorType != 3 || (info & 1048576) != 0)// read 1 byte
                  biome = in.read();
                if(colorType == 3 && customColorMultiplier == -1)
                  colorType = 0;

                boolean caveBlock = (info & 128) != 0;
                int light = (info >> 8) & 15;
              }
   }catch(IOException e){
     e.printStackTrace();
   }
   return col;
}



void readOverlay(InputStream in, int info){
  //overlays
    //int info = readInt(in);
    if ((info & 1) != 0) {  //isnt water so read 4 bytes
      int state = readInt(in);
    }else{ }

    int opacity = 1;

    int colorType = (info >> 8) & 3;
    int customColorMultiplier = -1;
    if (colorType == 2 || (info & 4) != 0){
      colorType = 2;
      customColorMultiplier = readInt(in);
      if(customColorMultiplier == -1)
        colorType = 0;
    }
    if ((info & 8) != 0) // opacity not 1
      opacity = readInt(in);
      int light = (info >> 4) & 15;
     //end overlays
}

int readInt(InputStream in){
  int i = 0;
  try{
    i = in.read() << 24 | (in.read() & 0xff) << 16 | (in.read() & 0xff) << 8 | (in.read() & 0xff);
  }catch(IOException e){
    e.printStackTrace();
  }
  return i;
}



void draw(){

}