/*
 *   GRacer
 *
 *   Copyright (C) 1999 Takashi Matsuda <matsu@users.sourceforge.net>
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <common/gr_ac3d.h>
#include <common/gr_course.h>
#include <common/gr_memory.h>

static void usage (FILE *file)
{
  fprintf (file,
       "Usage: following options are acceptable.\n"
       "	-i <filename>		specify ac3d scene file.\n"
       "	-o <filename>		output course file name.\n"
       "	-[xyz] <scale>		scale.\n"
       "	-t <title>		course title.\n"
       "	-d <description>	course description.\n"
       "	-s <threshold>		max distance between identical vertices.\n"
       "	-m <timestamp>		when this file was last modified.\n"
       "				format: [h:m:s] mm/dd/yyyy .\n"
       "	-h			show this message.\n"
       );
}

int main (int argc, char *argv[])
{
  char *optstring = "i:o:x:y:z:t:d:s:m:h";
  char *iname = NULL;
  char *oname = NULL;
  char *title = NULL;
  char *desc = NULL;
  char *stamp = NULL;
  FILE *ifile;
  FILE *ofile;
  Ac3dScene *scene;
  Ac3dObject *object;
  Ac3dRef *refs;
  GrCourse *course;
  GrCSegment *seg;
  int c;
  int i, j, k;
  char buf[256];
  int num, num_verts;
  float scale[3] = {10, 10, 10};
  float x0, y0, x1, y1;
  float threshold = 0.01;
  float *verts;
  int *indices;
  double len;
  double f;
  double xmax, xmin, ymax, ymin, zmax, zmin;
  int length;
  char *ext;

  while ((c = getopt(argc, argv, optstring)) != EOF) {
    switch (c) {
      case 'i':
	iname = optarg;
	break;

      case 'o':
	oname = optarg;
	break;

      case 'x':
	sscanf (optarg, "%f", &scale[0]);
	break;

      case 'y':
	sscanf (optarg, "%f", &scale[1]);
	break;

      case 'z':
	sscanf (optarg, "%f", &scale[2]);
	break;

      case 't':
	title = optarg;
	break;

      case 'd':
	desc = optarg;

      case 's':
	sscanf (optarg, "%f", &threshold);
	break;

      case 'm':
	stamp = optarg;
	break;

      case 'h':
	usage (stdout);
	return 0;

      default:
	usage (stderr);
	return -1;
    }
  }

  if (iname == NULL) {
    ifile = stdin;
  } else {
    ifile = fopen (iname, "r");
    if (!ifile) {
      fprintf (stderr, "couldn't open file \"%s\".\n", iname);
      return -1;
    }
  }

  if (oname == NULL) {
    ofile = stdout;
  } else {
    ofile = fopen (oname, "w");
    if (!ofile) {
      fprintf (stderr, "couldn't open file \"%s\".\n", oname);
      return -1;
    }
  }

  scene = ac3d_scene_new_from_file (ifile);
  fclose (ifile);

  if (!scene) {
    fprintf (stderr, "failed to read ac3d scene file.\n");
    return -1;
  }

  for (i=0; i<scene->num_objs; i++) {
    ac3d_object_absolute_coord (scene->objs[i], NULL);
    ac3d_object_scale (scene->objs[i], scale);
    ac3d_object_convert_coord (scene->objs[i]);
  }

  course = gr_new0 (GrCourse, 1);
  course->title = title;
  course->desc = desc;
  course->timestamp = stamp;

  ext = strrchr (iname, '.');
  if (ext == NULL) {
    length = strlen (iname);
  } else {
    length = ext - iname;
  }
  course->model = gr_new (char, length + 5);
  memcpy (course->model, iname, length);
  memcpy (course->model + length, ".grs", 5);

  /* count number of grid */
  sprintf (buf, "grid %d", 0);
  num = 0;
  object = ac3d_scene_find_object (scene, buf, NULL);
  while (object) {
    if (object->num_surfs < 1 || object->surfs[0]->num_refs < 2) {
      fprintf (stderr, "grid data (%d) is invalid.\n", num);
      return -1;
    }
    num ++;
    sprintf (buf, "grid %d", num);
    object = ac3d_scene_find_object (scene, buf, object);
  }

  course->num_grids = num;
  course->grids = gr_new (GrGrid, num);
  memset (course->grids, 0, sizeof(GrGrid) * num);

  sprintf (buf, "grid %d", 0);
  num = 0;
  object = ac3d_scene_find_object (scene, buf, NULL);
  while (object) {
    x0 = X(object->verts, object->surfs[0]->refs[0].ref);
    y0 = Y(object->verts, object->surfs[0]->refs[0].ref);
    x1 = X(object->verts, object->surfs[0]->refs[1].ref) - x0;
    y1 = Y(object->verts, object->surfs[0]->refs[1].ref) - y0;

    course->grids[num].x = x0;
    course->grids[num].y = y0;
    course->grids[num].dir = atan2 (y1, x1);

    num ++;
    sprintf (buf, "grid %d", num);
    object = ac3d_scene_find_object (scene, buf, object);
  }

  /* count number of control line */
  sprintf (buf, "control line %d", 0);
  num = 0;
  object = ac3d_scene_find_object (scene, buf, NULL);
  while (object) {
    if (object->num_surfs < 1 || object->surfs[0]->num_refs < 2) {
      fprintf (stderr, "data of control line %d is invalid.\n", num);
      return -1;
    }
    num ++;
    sprintf (buf, "control line %d", num);
    object = ac3d_scene_find_object (scene, buf, object);
  }

  course->num_clines = num;
  course->clines = gr_new (GrControlLine, num);
  memset (course->clines, 0, sizeof(GrControlLine) * num);

  sprintf (buf, "control line %d", 0);
  num = 0;
  object = ac3d_scene_find_object (scene, buf, NULL);
  while (object) {
    refs = object->surfs[0]->refs;

    course->clines[num].region_a[0].c.x = X(object->verts, refs[0].ref);
    course->clines[num].region_a[0].c.y = Y(object->verts, refs[0].ref);
    course->clines[num].region_a[1].c.x = X(object->verts, refs[1].ref);
    course->clines[num].region_a[1].c.y = Y(object->verts, refs[1].ref);
    course->clines[num].region_a[2].c.x = X(object->verts, refs[3].ref);
    course->clines[num].region_a[2].c.y = Y(object->verts, refs[3].ref);
    course->clines[num].region_a[3].c.x = X(object->verts, refs[2].ref);
    course->clines[num].region_a[3].c.y = Y(object->verts, refs[2].ref);

    course->clines[num].region_b[0].c.x = X(object->verts, refs[2].ref);
    course->clines[num].region_b[0].c.y = Y(object->verts, refs[2].ref);
    course->clines[num].region_b[1].c.x = X(object->verts, refs[3].ref);
    course->clines[num].region_b[1].c.y = Y(object->verts, refs[3].ref);
    course->clines[num].region_b[2].c.x = X(object->verts, refs[5].ref);
    course->clines[num].region_b[2].c.y = Y(object->verts, refs[5].ref);
    course->clines[num].region_b[3].c.x = X(object->verts, refs[4].ref);
    course->clines[num].region_b[3].c.y = Y(object->verts, refs[4].ref);

    num ++;
    sprintf (buf, "control line %d", num);
    object = ac3d_scene_find_object (scene, buf, object);
  }
  
  /* FIX ME */
  /* define surface characteristics */
  course->num_mats = 1;
  course->mats = gr_new (GrCMaterial, 1);
  memset (course->mats, 0, sizeof (GrCMaterial) * 1);

  /* count number of total vertices */
  num = 0;
  object = NULL;
  while ((object = ac3d_scene_find_object (scene, "course", object))) {
    num += object->num_verts;
  }

  verts = gr_new (float, 3 * num);
  indices = gr_new (int, num);

  num = 0;
  object = NULL;
  while ((object = ac3d_scene_find_object (scene, "course", object))) {
    memcpy (&X(verts, num), object->verts,
	    sizeof (*object->verts) * 3 * object->num_verts);
    num += object->num_verts;
  }
  for (i=0; i<num; i++) {
    indices[i] = i;
  }
						  /* OPTIMIZE VERTICES */
  threshold *= threshold;
  num_verts = num;
  for (i=0; i<num-1; i++) {
    for (j=i+1; j<num; j++) {
      if (indices[j] == j) {
	f = X(verts, i) - X(verts, j);
	len = f * f;
	f = Y(verts, i) - Y(verts, j);
	len += f * f;
	f = Z(verts, i) - Z(verts, j);
	len += f * f;

	if (len <= threshold) {
	  indices[j] = i;
	  num_verts --;
	}
      }
    }
  }

  for (i=0; i<num; i++) {
    if (indices[i] != i) {
      for (j=num-1; j>i; j--) {
	if (indices[j] == j) {
	  X(verts, i) = X(verts, j);
	  Y(verts, i) = Y(verts, j);
	  Z(verts, i) = Z(verts, j);

	  for (k=j; k<num; k++) {
	    if (indices[k] == j) {
	      indices[k] = i;
	    }
	  }
	  break;
	}
      }
    }
  }
  xmax = xmin = X(verts, 0);
  ymax = ymin = Y(verts, 0);
  zmax = zmin = Z(verts, 0);
  for (i=0; i<num; i++) {
    if (X(verts, i) > xmax) xmax = X(verts, i);
    if (X(verts, i) < xmin) xmin = X(verts, i);
    if (Y(verts, i) > ymax) ymax = Y(verts, i);
    if (Y(verts, i) < ymin) ymin = Y(verts, i);
    if (Z(verts, i) > zmax) zmax = Z(verts, i);
    if (Z(verts, i) < zmin) zmin = Z(verts, i);
  }

  course->num_segs = 1;
  course->segs = gr_new (GrCSegment *, 1);
  seg = gr_new (GrCSegment, 1);
  course->segs[0] = seg;
  memset (seg, 0, sizeof (*seg));

  seg->max.c.x = xmax;
  seg->max.c.y = ymax;
  seg->max.c.z = zmax;

  seg->min.c.x = xmin;
  seg->min.c.y = ymin;
  seg->min.c.z = zmin;

  seg->num_verts = num_verts;
  seg->verts = gr_new (GrVertex, num_verts);

  for (i=0; i<num_verts; i++) {
    seg->verts[i].c.x = X(verts, i);
    seg->verts[i].c.y = Y(verts, i);
    seg->verts[i].c.z = Z(verts, i);
  }

  num = 0;
  object = NULL;
  while ((object = ac3d_scene_find_object (scene, "course", object))) {
    for (i=0; i<object->num_surfs; i++) {
      if (object->surfs[i]->num_refs == 3) {
	num ++;
      }
    }
  }

  seg->num_surfs = num;
  seg->surfs = gr_new (GrCSurface, num);
  memset (seg->surfs, 0, sizeof (GrCSurface) * num);

  object = NULL;
  num = 0;
  j = 0;
  while ((object = ac3d_scene_find_object (scene, "course", object))) {
    for (i=0; i<object->num_surfs; i++) {
      if (object->surfs[i]->num_refs == 3) {
	seg->surfs[j].p[0] = indices[object->surfs[i]->refs[0].ref + num];
	seg->surfs[j].p[1] = indices[object->surfs[i]->refs[1].ref + num];
	seg->surfs[j].p[2] = indices[object->surfs[i]->refs[2].ref + num];
	j++;
      }
    }
    num += object->num_verts;
  }

  gr_course_write_file (course, ofile);

  return 0;
}