/* main.c: main driver for autotrace -- convert bitmaps to splines. */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* Def: HAVE_CONFIG_H */

#include "autotrace.h"
#include "message.h"
#include "cmdline.h"
#include "logreport.h"
#include "getopt.h"
#include "filename.h"
#include "xstd.h"
#include "atou.h"
#include "strgicmp.h"
#include "input.h"

#include <string.h>
#include <assert.h>
#include <math.h>

/* Pointers to functions based on input format.  (-input-format)  */
static at_input_read_func input_reader = NULL;

/* Return NAME with any leading path stripped off.  This returns a
   pointer into NAME.  For example, `basename ("/foo/bar.baz")'
   returns "bar.baz".  */
static char * get_basename (char * name);

/* The name of the file we're going to write.  (-output-file) */
static char * output_name = (char *)"";

/* The output function. (-output-format) */
static at_output_write_func output_writer = NULL;

/* Whether to print version information */
static at_bool printed_version;

/* Whether to write a log file */
static at_bool logging = false;

/* Whether to dump a bitmap file */
static at_bool dumping_bitmap = false;

/* Report tracing status in real time (--report-progress) */
static at_bool report_progress = false;
#define dot_printer_max_column 50
#define dot_printer_char '|'
static void dot_printer(at_real percentage, at_address client_data);

static char * read_command_line (int, char * [], 
				 at_fitting_opts_type *,
				 at_output_opts_type *);

static unsigned int hctoi (char c);

static void dump (at_bitmap_type * bitmap, FILE * fp);

static void input_list_formats(FILE * file);
static void output_list_formats(FILE* file);

static void exception_handler(at_string msg, at_msg_type type, at_address data);

#define DEFAULT_FORMAT "eps"

int
main (int argc, char * argv[])
{
  at_fitting_opts_type * fitting_opts;
  at_input_opts_type * input_opts;
  at_output_opts_type * output_opts;
  char * input_name, * input_rootname;
  char * logfile_name = NULL, * dumpfile_name = NULL;
  at_splines_type * splines;
  at_bitmap_type * bitmap;
  FILE *output_file;
  FILE *dump_file;

  at_progress_func progress_reporter = NULL;
  int progress_stat = 0;

  fitting_opts 		    = at_fitting_opts_new ();
  output_opts  		    = at_output_opts_new ();
  input_name = read_command_line (argc, argv, fitting_opts, output_opts);

  if (strgicmp (output_name, input_name))
    FATAL("Input and output file may not be the same\n");

  if ((input_rootname = remove_suffix (get_basename (input_name))) == NULL)
	FATAL1 ("Not a valid inputname %s", input_name);

  if (logging)
    log_file = xfopen (logfile_name = extend_filename (input_rootname, "log"), "w");

  /* BUG: Sometimes input_rootname points to the heap, sometimes to
     the stack, so it can't safely be freed. */
/*
  if (input_rootname != input_name)
    free (input_rootname);
*/
  if (logging)
    free (logfile_name);

  /* Set input_reader if it is not set in command line args */
  if (!input_reader)
    input_reader = at_input_get_handler (input_name);

  /* Set output_writer if it is not set in command line args 
     Step1. Guess from a file name.
     Step2. Use default. */
  if (!output_writer)
    output_writer = at_output_get_handler (output_name);
  if (!output_writer)
    {
      output_writer = at_output_get_handler_by_suffix(DEFAULT_FORMAT);
      if (output_writer == NULL)
	FATAL1("Default format %s not supported", DEFAULT_FORMAT);
    }

  /* Open output file */
  if (!strcmp (output_name, ""))
    output_file = stdout;
  else
    output_file = xfopen(output_name, "wb");

  /* Open the main input file.  */
  if (input_reader != NULL)
    {
      input_opts = at_input_opts_new ();
      if (fitting_opts->background_color)
	input_opts->background_color = at_color_copy(fitting_opts->background_color);
      
      bitmap = at_bitmap_read(input_reader, input_name, input_opts, 
			      exception_handler, NULL);
      
      at_input_opts_free(input_opts);
    }
  else
    FATAL ("Unsupported input format");

  if (report_progress)
    {
      progress_reporter = dot_printer;
      fprintf(stderr, "%-15s", input_name);
    };
    
  splines = at_splines_new_full(bitmap, fitting_opts,
				exception_handler, NULL,
				progress_reporter, &progress_stat,
				NULL, NULL);
  
  /* Dump loaded bitmap if needed */
  if (dumping_bitmap)
    {
      dumpfile_name = extend_filename (input_rootname, "bitmap");
      dump_file   = xfopen (dumpfile_name, "wb");
      dump(bitmap, dump_file);
      fclose(dump_file);
    }

  at_splines_write (output_writer,
		    output_file, 
		    output_name,
		    output_opts,
		    splines,
		    exception_handler, NULL);
  at_output_opts_free(output_opts);
  
  if (output_file != stdout)
    fclose (output_file);

  at_splines_free (splines); 
  at_bitmap_free (bitmap);
  at_fitting_opts_free(fitting_opts);

  if (report_progress)
    fputs("\n", stderr);

  return 0;
}


/* Reading the options.  */

#define USAGE1 "Options:\
<input_name> should be a supported image.\n"\
  GETOPT_USAGE								\
"background-color <hexadezimal>: the color of the background that\n\
  should be ignored, for example FFFFFF;\n\
  default is no background color.\n\
centerline: trace a character's centerline, rather than its outline.\n\
color-count <unsigned>: number of colors a color bitmap is reduced to,\n\
  it does not work on grayscale, allowed are 1..256;\n\
  default is 0, that means not color reduction is done.\n\
corner-always-threshold <angle-in-degrees>: if the angle at a pixel is\n\
  less than this, it is considered a corner, even if it is within\n\
  `corner-surround' pixels of another corner; default is 60.\n\
corner-surround <unsigned>: number of pixels on either side of a\n\
  point to consider when determining if that point is a corner;\n\
  default is 4.\n\
corner-threshold <angle-in-degrees>: if a pixel, its predecessor(s),\n\
  and its successor(s) meet at an angle smaller than this, it's a\n\
  corner; default is 100.\n\
despeckle-level <unsigned>: 0..20; default is no despeckling.\n\
despeckle-tightness <real>: 0.0..8.0; default is 2.0.\n\
dpi <unsigned>: The dots per inch value in the input image, affects scaling\n\
  of mif output image\n"
#define USAGE2 "error-threshold <real>: subdivide fitted curves that are off by\n\
  more pixels than this; default is 2.0.\n\
filter-iterations <unsigned>: smooth the curve this many times\n\
  before fitting; default is 4.\n\
input-format:  %s. \n\
help: print this message.\n\
line-reversion-threshold <real>: if a spline is closer to a straight\n\
  line than this, weighted by the square of the curve length, keep it a\n\
  straight line even if it is a list with curves; default is .01.\n\
line-threshold <real>: if the spline is not more than this far away\n\
  from the straight line defined by its endpoints,\n\
  then output a straight line; default is 1.\n\
list-output-formats: print a list of support output formats to stderr.\n\
list-input-formats:  print a list of support input formats to stderr.\n\
log: write detailed progress reports to <input_name>.log.\n\
output-file <filename>: write to <filename>\n\
output-format <format>: use format <format> for the output file\n\
  %s can be used.\n\
preserve-width: whether to preserve line width prior to thinning.\n\
remove-adjacent-corners: remove corners that are adjacent.\n\
tangent-surround <unsigned>: number of points on either side of a\n\
  point to consider when computing the tangent at that point; default is 3.\n\
report-progress: report tracing status in real time.\n\
debug-arch: print the type of cpu.\n\
debug-bitmap: dump loaded bitmap to <input_name>.bitmap.\n\
version: print the version number of this program.\n\
width-weight-factor <real>: weight factor for fitting the linewidth.\n\
"

/* We return the name of the image to process.  */

static char *
read_command_line (int argc, char * argv[], 
		   at_fitting_opts_type * fitting_opts,
		   at_output_opts_type * output_opts)
{
  int g;   /* `getopt' return code.  */
  int option_index;
  struct option long_options[]
    = { { "align-threshold",		1, 0, 0 },
	{ "background-color",		1, 0, 0 },
	{ "debug-arch",                 0, 0, 0 },
	{ "debug-bitmap",               0, (int *)&dumping_bitmap, 1 },
        { "centerline",			0, 0, 0 },
        { "color-count",                1, 0, 0 },
        { "corner-always-threshold",    1, 0, 0 },
        { "corner-surround",            1, 0, 0 },
        { "corner-threshold",           1, 0, 0 },
        { "despeckle-level",            1, 0, 0 },
        { "despeckle-tightness",        1, 0, 0 },
        { "dpi",			1, 0, 0 },
        { "error-threshold",            1, 0, 0 },
        { "filter-iterations",          1, 0, 0 },
        { "help",                       0, 0, 0 },
        { "input-format",		1, 0, 0 },
        { "line-reversion-threshold",	1, 0, 0 },
        { "line-threshold",             1, 0, 0 },
        { "list-output-formats",        0, 0, 0 },
        { "list-input-formats",         0, 0, 0 },
        { "log",                        0, (int *) &logging, 1 },
        { "output-file",		1, 0, 0 },
        { "output-format",		1, 0, 0 },
        { "preserve-width",             0, 0, 0 },
        { "range",                      1, 0, 0 },
        { "remove-adjacent-corners",    0, 0, 0 },
        { "tangent-surround",           1, 0, 0 },
	{ "report-progress",            0, (int *) &report_progress, 1},
        { "version",                    0, (int *) &printed_version, 1 },
	{ "width-weight-factor",               1, 0, 0 },
        { 0, 0, 0, 0 } };

  while (true)
    {

      g = getopt_long_only (argc, argv, "", long_options, &option_index);

      if (g == EOF)
        break;

      if (g == '?')
        exit (1);  /* Unknown option.  */

      assert (g == 0); /* We have no short option names.  */

      if (ARGUMENT_IS ("background-color"))
        {
           if (strlen (optarg) != 6)
               FATAL ("background-color be six chars long");
	       fitting_opts->background_color = at_color_new((unsigned char)(hctoi (optarg[0]) * 16 + hctoi (optarg[1])),
				       (unsigned char)(hctoi (optarg[2]) * 16 + hctoi (optarg[3])),
				       (unsigned char)(hctoi (optarg[4]) * 16 + hctoi (optarg[5])));
	    }
      else if (ARGUMENT_IS ("centerline"))
	fitting_opts->centerline = true;

      else if (ARGUMENT_IS ("color-count"))
        fitting_opts->color_count = atou (optarg);

      else if (ARGUMENT_IS ("corner-always-threshold"))
        fitting_opts->corner_always_threshold = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("corner-surround"))
        fitting_opts->corner_surround = atou (optarg);

      else if (ARGUMENT_IS ("corner-threshold"))
        fitting_opts->corner_threshold = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("debug-arch"))
	{
	  int endian = 1;
	  char * str;
	  if (*(char *)&endian)
	    str = "little";
	  else
	    str = "big";
	  
	  printf("%d bit, %s endian\n",
		 sizeof(void *) * 8,
		 str);
	  exit(0);
	}

      else if (ARGUMENT_IS ("despeckle-level"))
        fitting_opts->despeckle_level = atou (optarg);

      else if (ARGUMENT_IS ("despeckle-tightness"))
        fitting_opts->despeckle_tightness = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("dpi"))
	output_opts->dpi = atou (optarg);

      else if (ARGUMENT_IS ("error-threshold"))
        fitting_opts->error_threshold = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("filter-iterations"))
        fitting_opts->filter_iterations = atou (optarg);

      else if (ARGUMENT_IS ("help"))
        {
	  char *ishortlist, *oshortlist;
          fprintf (stderr, "Usage: %s [options] <input_name>.\n", argv[0]);
          fprintf (stderr, USAGE1);
          fprintf (stderr, USAGE2, ishortlist = at_input_shortlist(),
		   oshortlist = at_output_shortlist());
	  free (ishortlist);
	  free (oshortlist);
	  fprintf (stderr, 
		   "\nYou can get the source code of autotrace from \n%s\n",
		   at_home_site());
          exit (0);
        }

      else if (ARGUMENT_IS ("input-format"))
        {
	  input_reader = at_input_get_handler_by_suffix (optarg);
	  if (!input_reader)
	    FATAL1 ("Input format %s not supported\n", optarg);
        }

      else if (ARGUMENT_IS ("line-threshold"))
        fitting_opts->line_threshold = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("line-reversion-threshold"))
        fitting_opts->line_reversion_threshold = (at_real) atof (optarg);

      else if (ARGUMENT_IS ("list-output-formats"))
        {
	  fprintf (stderr, "Supported output formats:\n");
	  output_list_formats (stderr);
	  exit (0);
        }
      else if (ARGUMENT_IS ("list-input-formats"))
        {
	  fprintf (stderr, "Supported input formats:\n");
	  input_list_formats (stderr);
	  exit (0);
        }

      else if (ARGUMENT_IS ("output-file"))
        output_name = optarg;

      else if (ARGUMENT_IS ("output-format"))
        {
	    output_writer = at_output_get_handler_by_suffix (optarg);
	    if (output_writer == NULL)
	      FATAL1 ("Output format %s not supported", optarg);
        }
      else if (ARGUMENT_IS ("preserve_width"))
	fitting_opts->preserve_width = true;

      else if (ARGUMENT_IS ("remove-adjacent-corners"))
	fitting_opts->remove_adjacent_corners = true;
      
      else if (ARGUMENT_IS ("tangent-surround"))
        fitting_opts->tangent_surround = atou (optarg);

      else if (ARGUMENT_IS ("version"))
        printf ("AutoTrace version %s.\n", at_version(false));

      else if (ARGUMENT_IS ("width-weight-factor"))
	fitting_opts->width_weight_factor = (at_real) atof (optarg);

      /* Else it was just a flag; getopt has already done the assignment.  */
    }
  FINISH_COMMAND_LINE ();
}

/* Return NAME with any leading path stripped off.  This returns a
   pointer into NAME.  For example, `basename ("/foo/bar.baz")'
   returns "bar.baz".  */

static char *
get_basename (char * name)
{
#ifdef WIN32
  char * base = strrchr (name, '\\');
#else
  char * base = strrchr (name, '/');
#endif
  return base ? base + 1 : name;
}


/* Convert hex char to integer */

static unsigned int hctoi (char c)
{
  if (c == '0')
    return (0);
  else if (c == '1')
    return (1);
  else if (c == '2')
    return (2);
  else if (c == '3')
    return (3);
  else if (c == '4')
    return (4);
  else if (c == '5')
    return (5);
  else if (c == '6')
    return (6);
  else if (c == '7')
    return (7);
  else if (c == '8')
    return (8);
  else if (c == '9')
    return (9);
  else if (c == 'a')
    return (10);
  else if (c == 'A')
    return (10);
  else if (c == 'b')
    return (11);
  else if (c == 'B')
    return (11);
  else if (c == 'c')
    return (12);
  else if (c == 'C')
    return (12);
  else if (c == 'd')
    return (13);
  else if (c == 'D')
    return (13);
  else if (c == 'e')
    return (14);
  else if (c == 'E')
    return (14);
  else if (c == 'f')
    return (15);
  else if (c == 'F')
    return (15);
  else
    FATAL ("No hex values");
}

static void
input_list_formats(FILE * file)
{
  char ** list = at_input_list_new ();
  char ** tmp;

  char * suffix;
  char * descr;
  tmp = list;
  while (*list)
    {
      suffix = *list++;
      descr = *list++;
      fprintf(file, "%5s %s\n", suffix, descr);
    }
  
  at_input_list_free(tmp);
}


static void
output_list_formats(FILE* file)
{
  char ** list = at_output_list_new ();
  char ** tmp;

  char * suffix;
  char * descr;
  tmp = list;
  while (*list)
    {
      suffix = *list++;
      descr = *list++;
      fprintf(file, "%10s %s\n", suffix, descr);
    }
  
  at_output_list_free(tmp);
}

static void
dot_printer(at_real percentage, at_address client_data)
{
  int * current = (int *)client_data;
  float unit 	= (float)1.0 / (float)(dot_printer_max_column) ;
  int maximum = (int)(percentage / unit);
 
  while (*current < maximum)
    {
      fputc(dot_printer_char, stderr);
      (*current)++;
    }
}

static void
dump (at_bitmap_type * bitmap, FILE * fp)
{
  unsigned short width, height;
  unsigned int np;

  width  = at_bitmap_get_width (bitmap);
  height = at_bitmap_get_height (bitmap);
  np 	 = at_bitmap_get_planes (bitmap);
  fprintf(fp, "w=%u, h=%u, np=%u\n", width, height, np);

  fwrite(AT_BITMAP_BITS(*bitmap), 
	 sizeof(unsigned char),
	 width * height * np,
	 fp);
}

static void
exception_handler(at_string msg, at_msg_type type, at_address data)
{
  if (type == AT_MSG_FATAL)
    {
      fprintf (stderr, "%s\n", msg);
      exit (1);
    }
  else if (type == AT_MSG_WARNING)
    fprintf (stderr, "%s\n", msg);
  else
    exception_handler("Wrong type of msg", AT_MSG_FATAL, NULL);
}