#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

#include <jpeglib.h>
#include <argtable2.h>
#include <string.h>

const char * input_file;
const char * output_file;
const char * filter;
const char * axis;
const char * direction;
double times;
double percent;


/* we will be using this uninitialized pointer later to store raw, uncompressd image */
JSAMPARRAY row_pointers = NULL;


/* dimensions of the image we want to write */
JDIMENSION width;
JDIMENSION height;
int num_components;
int quality = 75;
J_COLOR_SPACE color_space;

JSAMPLE clamp(int x){
	if(x<0) return 0;
	if(x>255) return 255;
	return x;
}

void brightness(){
  int x, y;
  if (color_space != JCS_RGB)  return;

  for (y=0; y<height; y++) {
    JSAMPROW row = row_pointers[y];
    for (x=0; x<width; x++) {
      JSAMPROW ptr = &(row[x*3]);

      ptr[0] = clamp(ptr[0]+percent/100*ptr[0]);
      ptr[1] = clamp(ptr[1]+percent/100*ptr[1]);
	  ptr[2] = clamp(ptr[2]+percent/100*ptr[2]);
    }
  }
}   

void negate(){
  int x, y;
  if (color_space != JCS_RGB)  return;

  for (y=0; y<height; y++) {
    JSAMPROW row = row_pointers[y];
    for (x=0; x<width; x++) {
      JSAMPROW ptr = &(row[x*3]);

      ptr[0] = 255-ptr[0];
      ptr[1] = 255-ptr[1];
	  ptr[2] = 255-ptr[2];
    }
  }
}   

void contrast(){
  int x, y;
  if (color_space != JCS_RGB)  return;

  for (y=0; y<height; y++) {
    JSAMPROW row = row_pointers[y];
    for (x=0; x<width; x++) {
      JSAMPROW ptr = &(row[x*3]);

      ptr[0] = clamp(times*(ptr[0]-127)+127);
      ptr[1] = clamp(times*(ptr[1]-127)+127);
	  ptr[2] = clamp(times*(ptr[2]-127)+127);
    }
  }
}   

void sepia(){
  int x, y;
  if (color_space != JCS_RGB)  return;

  for (y=0; y<height; y++) {
    JSAMPROW row = row_pointers[y];
    for (x=0; x<width; x++) {
      JSAMPROW ptr = &(row[x*3]);

	  int r = ptr[0];
	  int g = ptr[1];
	  int b = ptr[2];

      ptr[0] = clamp(0.393*r+0.769*g+0.189*b);
      ptr[1] = clamp(0.349*r+0.686*g+0.168*b);
	  ptr[2] = clamp(0.272*r+0.534*g+0.131*b);
    }
  }
}   

void flip(){
  int x, y;
  if (color_space != JCS_RGB)  return;

  if (strcmp(axis, "y") == 0) {
      for (y=0; y<height; y++) {
        JSAMPROW row = row_pointers[y];
        for (x=0; x<width/2; x++) {
          JSAMPROW ptr1 = &(row[x*3]);
          JSAMPROW ptr2 = &(row[(width-1-x)*3]);

          JSAMPLE tmp;
          tmp=ptr1[0]; ptr1[0]=ptr2[0]; ptr2[0]=tmp;
          tmp=ptr1[1]; ptr1[1]=ptr2[1]; ptr2[1]=tmp;
          tmp=ptr1[2]; ptr1[2]=ptr2[2]; ptr2[2]=tmp;
        }
      }
  } else if (strcmp(axis, "x") == 0) {
      for (y=0; y<height/2; y++) {
        JSAMPROW row_top = row_pointers[y];
        JSAMPROW row_bottom = row_pointers[height-1-y];
        for (x=0; x<width; x++) {
          JSAMPROW ptr1 = &(row_top[x*3]);
          JSAMPROW ptr2 = &(row_bottom[x*3]);

          JSAMPLE tmp;
          tmp=ptr1[0]; ptr1[0]=ptr2[0]; ptr2[0]=tmp;
          tmp=ptr1[1]; ptr1[1]=ptr2[1]; ptr2[1]=tmp;
          tmp=ptr1[2]; ptr1[2]=ptr2[2]; ptr2[2]=tmp;
        }
      }
  }
}

void rotate(){
  int x, y;
  if (color_space != JCS_RGB) return;

  JDIMENSION new_width = height;
  JDIMENSION new_height = width;
  size_t new_rowbytes = new_width * num_components;
  
  JSAMPARRAY new_row_pointers = (JSAMPARRAY) malloc(sizeof(j_common_ptr) * new_height);
  for (y = 0; y < new_height; y++){
      new_row_pointers[y] = (JSAMPROW) malloc(new_rowbytes);
  }

  if (strcmp(direction, "right") == 0) {
      for (y = 0; y < new_height; y++) {
          for (x = 0; x < new_width; x++) {
              int old_x = y;
              int old_y = height - 1 - x;
              
              new_row_pointers[y][x*3 + 0] = row_pointers[old_y][old_x*3 + 0];
              new_row_pointers[y][x*3 + 1] = row_pointers[old_y][old_x*3 + 1];
              new_row_pointers[y][x*3 + 2] = row_pointers[old_y][old_x*3 + 2];
          }
      }
  } else if (strcmp(direction, "left") == 0) {
      for (y = 0; y < new_height; y++) {
          for (x = 0; x < new_width; x++) {
              int old_x = width - 1 - y;
              int old_y = x;
              
              new_row_pointers[y][x*3 + 0] = row_pointers[old_y][old_x*3 + 0];
              new_row_pointers[y][x*3 + 1] = row_pointers[old_y][old_x*3 + 1];
              new_row_pointers[y][x*3 + 2] = row_pointers[old_y][old_x*3 + 2];
          }
      }
  }

  for (y = 0; y < height; y++){
      free(row_pointers[y]);
  }
  free(row_pointers);
  row_pointers = new_row_pointers;
  width = new_width;
  height = new_height;
}


void process_file(){
    if(strcmp(filter, "negate") ==0 ){
            negate();
    }
	else if(strcmp(filter, "brightness") ==0 ){
            brightness();
    }
    else if(strcmp(filter, "contrast") ==0 ){
            contrast();
    }
	else if(strcmp(filter, "sepia") ==0 ){
            sepia();
    }
	else if(strcmp(filter, "flip") ==0 ){
            flip();
    }
	else if(strcmp(filter, "rotate") ==0 ){
            rotate();
    }
}




void abort_(const char * s, ...)
{
	va_list args;
	va_start(args, s);
	vfprintf(stderr, s, args);
	fprintf(stderr, "\n");
	va_end(args);
	abort();
}


/**
 * read_jpeg_file Reads from a jpeg file on disk specified by filename and saves into the 
 * raw_image buffer in an uncompressed format.
 * 
 * \returns positive integer if successful, -1 otherwise
 * \param *filename char string specifying the file name to read from
 *
 */

void read_jpeg_file( const char *filename )
{
	/* these are standard libjpeg structures for reading(decompression) */
	struct jpeg_decompress_struct cinfo;
	struct jpeg_error_mgr jerr;
	/* libjpeg data structure for storing one row, that is, scanline of an image */
	int y;
	
	FILE *infile = fopen( filename, "rb" );
	
	if ( !infile )
	{
		abort_("Error opening input jpeg file %s!\n", filename);
	}
	/* here we set up the standard libjpeg error handler */
	cinfo.err = jpeg_std_error( &jerr );
	jpeg_create_decompress( &cinfo );
	/* this makes the library read from infile */
	jpeg_stdio_src( &cinfo, infile );
	/* reading the image header which contains image information */
	jpeg_read_header( &cinfo, TRUE );


	/* Start decompression jpeg here */
	jpeg_start_decompress( &cinfo );
	width = cinfo.output_width;
	height = cinfo.output_height;
	num_components = cinfo.out_color_components;
	color_space = cinfo.out_color_space;
	
	
	/* allocate memory to hold the uncompressed image */
	size_t rowbytes = width * num_components;
	row_pointers = (JSAMPARRAY) malloc(sizeof(j_common_ptr) * height);
	for (y=0; y<height; y++){
		row_pointers[y] = (JSAMPROW) malloc(rowbytes);
	}
	
	
	/* read one scan line at a time */
	y=0;
	JSAMPARRAY tmp = row_pointers;
	while( cinfo.output_scanline < cinfo.image_height )
	{
		y = jpeg_read_scanlines( &cinfo, tmp, 1 );
		tmp +=y;
	}
	/* wrap up decompression, destroy objects, free pointers and close open files */
	jpeg_finish_decompress( &cinfo );
	jpeg_destroy_decompress( &cinfo );
// 	free( row_pointer[0] );
	fclose( infile );
	/* yup, we succeeded! */
}




/**
 * write_jpeg_file Writes the raw image data stored in the raw_image buffer
 * to a jpeg image with default compression and smoothing options in the file
 * specified by *filename.
 *
 * \returns positive integer if successful, -1 otherwise
 * \param *filename char string specifying the file name to save to
 *
 */
void write_jpeg_file( const char *filename )
{
	struct jpeg_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	int y;
	JSAMPARRAY tmp;

	
	/* this is a pointer to one row of image data */
	FILE *outfile = fopen( filename, "wb" );
	
	if ( !outfile )	{
		abort_("Error opening output jpeg file %s!\n", filename );
	}
	cinfo.err = jpeg_std_error( &jerr );
	jpeg_create_compress(&cinfo);
	jpeg_stdio_dest(&cinfo, outfile);

	/* Setting the parameters of the output file here */
	cinfo.image_width = width;	
	cinfo.image_height = height;
	cinfo.input_components = num_components;
	cinfo.in_color_space = color_space;
    /* default compression parameters, we shouldn't be worried about these */
	jpeg_set_defaults( &cinfo );
	jpeg_set_quality (&cinfo, quality, TRUE);
	/* Now do the compression .. */
	jpeg_start_compress( &cinfo, TRUE );
	/* like reading a file, this time write one row at a time */
	tmp = row_pointers;
	while( cinfo.next_scanline < cinfo.image_height )
	{
		y = jpeg_write_scanlines( &cinfo, tmp, 1 );
		tmp +=y;
	}
	/* similar to read file, clean up after we're done compressing */
	jpeg_finish_compress( &cinfo );
	jpeg_destroy_compress( &cinfo );
	fclose( outfile );
	
        /* cleanup heap allocation */
	for (y=0; y<height; y++){
		free(row_pointers[y]);
	}
	free(row_pointers);
}




int main(int argc, char **argv){   
  // Options
  struct arg_file *input_file_arg = arg_file1("i", "in-file", "<input>", "Input JPEG File");
  struct arg_file *output_file_arg = arg_file1("o", "out-file" , "<output>", "Output JPEG File");
  struct arg_str *filter_arg = arg_str1("f", "filter" , "<filter>", "Filter");
  struct arg_str *axis_arg = arg_str0("a", "axis" , "<axis>", "Flip axis (x/y)");
  struct arg_str *direction_arg = arg_str0("d", "direction" , "<direction>", "Rotate direction (left/right)");
  struct arg_dbl *times_arg = arg_dbl0("t", "times" , "<times>", "Multiplyer");
  struct arg_dbl *percent_arg = arg_dbl0("p", "percent" , "<percent>", "Percent for brightness");
  struct arg_lit *help = arg_lit0("h","help", "print this help and exit");
  struct arg_end *end = arg_end(10); // maksymalna liczba błędów 10
  
  int nerrors;
  
  void *argtable[] = {input_file_arg, output_file_arg, axis_arg, direction_arg, filter_arg, percent_arg, times_arg, help, end};
  
  if (arg_nullcheck(argtable) != 0) printf("error: insufficient memory\n");
  
  times_arg->dval[0] = 1;
  axis_arg->sval[0] = "y";
  direction_arg->sval[0] = "right";
  percent_arg->dval[0] = 0;
  
  nerrors = arg_parse(argc, argv, argtable);

  if (help->count > 0){
     printf("Usage: point");
     arg_print_syntax(stdout, argtable,"\n");
     arg_print_glossary(stdout, argtable,"  %-25s %s\n");
     arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
     return 0;
  }

  
  if (nerrors==0){
     input_file = input_file_arg->filename[0];
     output_file = output_file_arg->filename[0];
     filter = filter_arg->sval[0];
	 axis = axis_arg->sval[0];
	 direction = direction_arg->sval[0];
     times = times_arg->dval[0];
	 percent = percent_arg->dval[0];
  }
  else{
     arg_print_errors(stderr, end, "point");
     arg_print_glossary(stderr, argtable, " %-25s %s\n");
     arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
     return 1;
  }


   read_jpeg_file(input_file);
   process_file();
   write_jpeg_file(output_file);
   arg_freetable(argtable, sizeof(argtable)/sizeof(argtable[0]));
   return 0;
}