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

#include "bmp_io.h"
#include "pbmpak.h"

#define MAX_LEN 80

int main ( long argc, char **argv );
int bmp_2_ppma ( char *filein_name, char *fileout_name );
int imat_vert_flip ( int xsize, int ysize, int *array );

/******************************************************************************/

int main ( long argc, char **argv ) {

/******************************************************************************/

/*
  Purpose:

    This program converts a BMP file to an ASCII PPM file.

  Modified:

    08 April 2001

  Author:

    John Burkardt

  Usage:

    bmp_2_ppma file.bmp file.ppm

  Parameters:

    FILE.BMP is the name of the input BMP file to be read.

    FILE.PPM is the name of the output ASCII PPM file to be created.
*/
  char filein_name[MAX_LEN];
  char fileout_name[MAX_LEN];
  char input[MAX_LEN];
  int result;
/*
  Get the specification for the input file.
*/
  if ( argc < 2 ) {

    printf ( "\n" );
    printf ( "BMP_2_PPMA:\n" );
    printf ( "  Please enter the input BMP file name:\n" );
    if ( fgets ( input, MAX_LEN, stdin ) != NULL ) {
      sscanf ( input, "%s", filein_name );
    }
    else {
      printf ( "Input error!\n" );
      return EXIT_FAILURE;
    }
  }
  else {
    strcpy ( filein_name, argv[1] );
  }
/*
  Get the specification for the output file.
*/
  if ( argc < 3 ) {
    printf ( "\n" );
    printf ( "BMP_2_PPMA:\n" );
    printf ( "  Please enter the output PPM file name:\n" );
    if ( fgets ( input, MAX_LEN, stdin ) != NULL ) {
      sscanf ( input, "%s", fileout_name );
    }
    else {
      printf ( "Input error!\n" );
      return EXIT_FAILURE;
    }
  }
  else {
    strcpy ( fileout_name, argv[2] );
  }

  result = bmp_2_ppma ( filein_name, fileout_name );

  return result;
}
/******************************************************************************/

int bmp_2_ppma ( char *filein_name, char *fileout_name ) {

/******************************************************************************/

/*
  Purpose:

    BMP_2_PPMA reads a BMP file and writes a PPMA file.

  Modified:

    06 April 2001

  Author:

    John Burkardt

  Parameters:

    Input, char *FILEIN_NAME, the name of the input BMP file.

    Input, char *FILEOUT_NAME, the name of the output PPMA file.
*/

  int *barray;
  int *garray;
  int maxrgb = 255;
  int *rarray;
  int result;
  int xsize;
  int ysize;

  rarray = NULL;
  garray = NULL;
  barray = NULL;
/*
  Read the data from the BMP file.
*/
  result = bmp_read ( filein_name, &xsize, &ysize, &rarray, &garray, &barray );

  if ( result != 0 ) {
    printf ( "\n" );
    printf ( "BMP_2_PPMA - Fatal error!\n" );
    printf ( "  BMP_READ failed.\n" );
    return 1;
  }

  printf ( "\n" );
  printf ( "BMP_2_PPMA:\n" );
  printf ( "  XSIZE = %d.\n", xsize );
  printf ( "  YSIZE = %d.\n", ysize );
/*
  The BMP up-down orientation is the opposite of what it is in PPM.
*/
  result = imat_vert_flip ( xsize, ysize, rarray );
  result = imat_vert_flip ( xsize, ysize, garray );
  result = imat_vert_flip ( xsize, ysize, barray );

  result = ppma_write ( fileout_name, xsize, ysize, maxrgb,
    rarray, garray, barray );

  if ( result != 0 ) {
    printf ( "\n" );
    printf ( "BMP_2_PPMA - Fatal error!\n" );
    printf ( "  PPMA_WRITE failed.\n" );
    return 2;
  }
/*
  Free the memory.
*/
  if ( rarray != NULL ) {
    free ( rarray );
  }

  if ( garray != NULL ) {
    free ( garray );
  }

  if ( barray != NULL ) {
    free ( barray );
  }

  return 0;
}
/******************************************************************************/

int imat_vert_flip ( int xsize, int ysize, int *array ) {

/******************************************************************************/

/*
  Purpose:

    IMAT_VERT_FLIP swaps rows of a 2D array, to flip it vertically.

  Modified:

    07 April 2001

  Author:

    John Burkardt

  Parameters:

    Input, int XSIZE, int YSIZE, the number of columns and rows.

    Input, int *ARRAY, the address of the first element of the array.
*/
  int i;
  int j;
  int k1;
  int k2;
  int temp;

  printf ( "Flipping \n" );

  for ( j = 0; j <= ( ysize / 2 ); j++ ) {

    k1 = xsize * j;
    k2 = xsize * ( ysize - 1 - j );

    for ( i = 0; i < xsize; i++ ) {
      temp        = array[k1+i];
      array[k1+i] = array[k2+i];
      array[k2+i] = temp;
    }
  }

  return 0;
}