/*  ADMesh -- process triangulated solid meshes
 *  Copyright (C) 1995, 1996  Anthony D. Martin <amartin@engr.csulb.edu>
 *  Copyright (C) 2013, 2014  several contributors, see AUTHORS
 *
 *  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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  Questions, comments, suggestions, etc to
 *           https://github.com/admesh/admesh/issues
 */

#include <stdlib.h>
#include <string.h>
#include "stl.h"

#include <boost/nowide/cstdio.hpp>
#include <boost/detail/endian.hpp>

#if !defined(SEEK_SET)
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif

void
stl_print_edges(stl_file *stl, FILE *file) {
  int i;
  int edges_allocated;

  if (stl->error) return;

  edges_allocated = stl->stats.number_of_facets * 3;
  for(i = 0; i < edges_allocated; i++) {
    fprintf(file, "%d, %f, %f, %f, %f, %f, %f\n",
            stl->edge_start[i].facet_number,
            stl->edge_start[i].p1(0), stl->edge_start[i].p1(1),
            stl->edge_start[i].p1(2), stl->edge_start[i].p2(0),
            stl->edge_start[i].p2(1), stl->edge_start[i].p2(2));
  }
}


void
stl_stats_out(stl_file *stl, FILE *file, char *input_file) {
  if (stl->error) return;

  /* this is here for Slic3r, without our config.h
     it won't use this part of the code anyway */
#ifndef VERSION
#define VERSION "unknown"
#endif
  fprintf(file, "\n\
================= Results produced by ADMesh version " VERSION " ================\n");
  fprintf(file, "\
Input file         : %s\n", input_file);
  if(stl->stats.type == binary) {
    fprintf(file, "\
File type          : Binary STL file\n");
  } else {
    fprintf(file, "\
File type          : ASCII STL file\n");
  }
  fprintf(file, "\
Header             : %s\n", stl->stats.header);
  fprintf(file, "============== Size ==============\n");
  fprintf(file, "Min X = % f, Max X = % f\n",
          stl->stats.min(0), stl->stats.max(0));
  fprintf(file, "Min Y = % f, Max Y = % f\n",
          stl->stats.min(1), stl->stats.max(1));
  fprintf(file, "Min Z = % f, Max Z = % f\n",
          stl->stats.min(2), stl->stats.max(2));

  fprintf(file, "\
========= Facet Status ========== Original ============ Final ====\n");
  fprintf(file, "\
Number of facets                 : %5d               %5d\n",
          stl->stats.original_num_facets, stl->stats.number_of_facets);
  fprintf(file, "\
Facets with 1 disconnected edge  : %5d               %5d\n",
          stl->stats.facets_w_1_bad_edge, stl->stats.connected_facets_2_edge -
          stl->stats.connected_facets_3_edge);
  fprintf(file, "\
Facets with 2 disconnected edges : %5d               %5d\n",
          stl->stats.facets_w_2_bad_edge, stl->stats.connected_facets_1_edge -
          stl->stats.connected_facets_2_edge);
  fprintf(file, "\
Facets with 3 disconnected edges : %5d               %5d\n",
          stl->stats.facets_w_3_bad_edge, stl->stats.number_of_facets -
          stl->stats.connected_facets_1_edge);
  fprintf(file, "\
Total disconnected facets        : %5d               %5d\n",
          stl->stats.facets_w_1_bad_edge + stl->stats.facets_w_2_bad_edge +
          stl->stats.facets_w_3_bad_edge, stl->stats.number_of_facets -
          stl->stats.connected_facets_3_edge);

  fprintf(file,
          "=== Processing Statistics ===     ===== Other Statistics =====\n");
  fprintf(file, "\
Number of parts       : %5d        Volume   : % f\n",
          stl->stats.number_of_parts, stl->stats.volume);
  fprintf(file, "\
Degenerate facets     : %5d\n", stl->stats.degenerate_facets);
  fprintf(file, "\
Edges fixed           : %5d\n", stl->stats.edges_fixed);
  fprintf(file, "\
Facets removed        : %5d\n", stl->stats.facets_removed);
  fprintf(file, "\
Facets added          : %5d\n", stl->stats.facets_added);
  fprintf(file, "\
Facets reversed       : %5d\n", stl->stats.facets_reversed);
  fprintf(file, "\
Backwards edges       : %5d\n", stl->stats.backwards_edges);
  fprintf(file, "\
Normals fixed         : %5d\n", stl->stats.normals_fixed);
}

void
stl_write_ascii(stl_file *stl, const char *file, const char *label) {
  int       i;
  char      *error_msg;

  if (stl->error) return;

  /* Open the file */
  FILE *fp = boost::nowide::fopen(file, "w");
  if(fp == NULL) {
    error_msg = (char*)
                malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
    sprintf(error_msg, "stl_write_ascii: Couldn't open %s for writing",
            file);
    perror(error_msg);
    free(error_msg);
    stl->error = 1;
    return;
  }

  fprintf(fp, "solid  %s\n", label);

  for(i = 0; i < stl->stats.number_of_facets; i++) {
    fprintf(fp, "  facet normal % .8E % .8E % .8E\n",
            stl->facet_start[i].normal(0), stl->facet_start[i].normal(1),
            stl->facet_start[i].normal(2));
    fprintf(fp, "    outer loop\n");
    fprintf(fp, "      vertex % .8E % .8E % .8E\n",
            stl->facet_start[i].vertex[0](0), stl->facet_start[i].vertex[0](1),
            stl->facet_start[i].vertex[0](2));
    fprintf(fp, "      vertex % .8E % .8E % .8E\n",
            stl->facet_start[i].vertex[1](0), stl->facet_start[i].vertex[1](1),
            stl->facet_start[i].vertex[1](2));
    fprintf(fp, "      vertex % .8E % .8E % .8E\n",
            stl->facet_start[i].vertex[2](0), stl->facet_start[i].vertex[2](1),
            stl->facet_start[i].vertex[2](2));
    fprintf(fp, "    endloop\n");
    fprintf(fp, "  endfacet\n");
  }

  fprintf(fp, "endsolid  %s\n", label);

  fclose(fp);
}

void
stl_print_neighbors(stl_file *stl, char *file) {
  int i;
  FILE *fp;
  char *error_msg;

  if (stl->error) return;

  /* Open the file */
  fp = boost::nowide::fopen(file, "w");
  if(fp == NULL) {
    error_msg = (char*)
                malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
    sprintf(error_msg, "stl_print_neighbors: Couldn't open %s for writing",
            file);
    perror(error_msg);
    free(error_msg);
    stl->error = 1;
    return;
  }

  for(i = 0; i < stl->stats.number_of_facets; i++) {
    fprintf(fp, "%d, %d,%d, %d,%d, %d,%d\n",
            i,
            stl->neighbors_start[i].neighbor[0],
            (int)stl->neighbors_start[i].which_vertex_not[0],
            stl->neighbors_start[i].neighbor[1],
            (int)stl->neighbors_start[i].which_vertex_not[1],
            stl->neighbors_start[i].neighbor[2],
            (int)stl->neighbors_start[i].which_vertex_not[2]);
  }
  fclose(fp);
}

#ifndef BOOST_LITTLE_ENDIAN
// Swap a buffer of 32bit data from little endian to big endian and vice versa.
void stl_internal_reverse_quads(char *buf, size_t cnt)
{
  for (size_t i = 0; i < cnt; i += 4) {
    std::swap(buf[i], buf[i+3]);
    std::swap(buf[i+1], buf[i+2]);
  }
}
#endif

void
stl_write_binary(stl_file *stl, const char *file, const char *label) {
  FILE      *fp;
  int       i;
  char      *error_msg;

  if (stl->error) return;

  /* Open the file */
  fp = boost::nowide::fopen(file, "wb");
  if(fp == NULL) {
    error_msg = (char*)
                malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
    sprintf(error_msg, "stl_write_binary: Couldn't open %s for writing",
            file);
    perror(error_msg);
    free(error_msg);
    stl->error = 1;
    return;
  }

  fprintf(fp, "%s", label);
  for(i = strlen(label); i < LABEL_SIZE; i++) putc(0, fp);

  fseek(fp, LABEL_SIZE, SEEK_SET);
#ifdef BOOST_LITTLE_ENDIAN
  fwrite(&stl->stats.number_of_facets, 4, 1, fp);
  for (i = 0; i < stl->stats.number_of_facets; ++ i)
    fwrite(stl->facet_start + i, SIZEOF_STL_FACET, 1, fp);
#else /* BOOST_LITTLE_ENDIAN */
  char buffer[50];
  // Convert the number of facets to little endian.
  memcpy(buffer, &stl->stats.number_of_facets, 4);
  stl_internal_reverse_quads(buffer, 4);
  fwrite(buffer, 4, 1, fp);
  for (i = 0; i < stl->stats.number_of_facets; ++ i) {
    memcpy(buffer, stl->facet_start + i, 50);
    // Convert to little endian.
    stl_internal_reverse_quads(buffer, 48);
    fwrite(buffer, SIZEOF_STL_FACET, 1, fp);
  }
#endif /* BOOST_LITTLE_ENDIAN */
  fclose(fp);
}

void
stl_write_vertex(stl_file *stl, int facet, int vertex) {
  if (stl->error) return;
  printf("  vertex %d/%d % .8E % .8E % .8E\n", vertex, facet,
         stl->facet_start[facet].vertex[vertex](0),
         stl->facet_start[facet].vertex[vertex](1),
         stl->facet_start[facet].vertex[vertex](2));
}

void
stl_write_facet(stl_file *stl, char *label, int facet) {
  if (stl->error) return;
  printf("facet (%d)/ %s\n", facet, label);
  stl_write_vertex(stl, facet, 0);
  stl_write_vertex(stl, facet, 1);
  stl_write_vertex(stl, facet, 2);
}

void
stl_write_edge(stl_file *stl, char *label, stl_hash_edge edge) {
  if (stl->error) return;
  printf("edge (%d)/(%d) %s\n", edge.facet_number, edge.which_edge, label);
  if(edge.which_edge < 3) {
    stl_write_vertex(stl, edge.facet_number, edge.which_edge % 3);
    stl_write_vertex(stl, edge.facet_number, (edge.which_edge + 1) % 3);
  } else {
    stl_write_vertex(stl, edge.facet_number, (edge.which_edge + 1) % 3);
    stl_write_vertex(stl, edge.facet_number, edge.which_edge % 3);
  }
}

void
stl_write_neighbor(stl_file *stl, int facet) {
  if (stl->error) return;
  printf("Neighbors %d: %d, %d, %d ;  %d, %d, %d\n", facet,
         stl->neighbors_start[facet].neighbor[0],
         stl->neighbors_start[facet].neighbor[1],
         stl->neighbors_start[facet].neighbor[2],
         stl->neighbors_start[facet].which_vertex_not[0],
         stl->neighbors_start[facet].which_vertex_not[1],
         stl->neighbors_start[facet].which_vertex_not[2]);
}

void
stl_write_quad_object(stl_file *stl, char *file) {
  FILE      *fp;
  int       i;
  int       j;
  char      *error_msg;
  stl_vertex connect_color = stl_vertex::Zero();
  stl_vertex uncon_1_color = stl_vertex::Zero();
  stl_vertex uncon_2_color = stl_vertex::Zero();
  stl_vertex uncon_3_color = stl_vertex::Zero();
  stl_vertex color;

  if (stl->error) return;

  /* Open the file */
  fp = boost::nowide::fopen(file, "w");
  if(fp == NULL) {
    error_msg = (char*)
                malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
    sprintf(error_msg, "stl_write_quad_object: Couldn't open %s for writing",
            file);
    perror(error_msg);
    free(error_msg);
    stl->error = 1;
    return;
  }

  fprintf(fp, "CQUAD\n");
  for(i = 0; i < stl->stats.number_of_facets; i++) {
    j = ((stl->neighbors_start[i].neighbor[0] == -1) +
         (stl->neighbors_start[i].neighbor[1] == -1) +
         (stl->neighbors_start[i].neighbor[2] == -1));
    if(j == 0) {
      color = connect_color;
    } else if(j == 1) {
      color = uncon_1_color;
    } else if(j == 2) {
      color = uncon_2_color;
    } else {
      color = uncon_3_color;
    }
    fprintf(fp, "%f %f %f    %1.1f %1.1f %1.1f 1\n",
            stl->facet_start[i].vertex[0](0),
            stl->facet_start[i].vertex[0](1),
            stl->facet_start[i].vertex[0](2), color(0), color(1), color(2));
    fprintf(fp, "%f %f %f    %1.1f %1.1f %1.1f 1\n",
            stl->facet_start[i].vertex[1](0),
            stl->facet_start[i].vertex[1](1),
            stl->facet_start[i].vertex[1](2), color(0), color(1), color(2));
    fprintf(fp, "%f %f %f    %1.1f %1.1f %1.1f 1\n",
            stl->facet_start[i].vertex[2](0),
            stl->facet_start[i].vertex[2](1),
            stl->facet_start[i].vertex[2](2), color(0), color(1), color(2));
    fprintf(fp, "%f %f %f    %1.1f %1.1f %1.1f 1\n",
            stl->facet_start[i].vertex[2](0),
            stl->facet_start[i].vertex[2](1),
            stl->facet_start[i].vertex[2](2), color(0), color(1), color(2));
  }
  fclose(fp);
}

void
stl_write_dxf(stl_file *stl, char *file, char *label) {
  int       i;
  FILE      *fp;
  char      *error_msg;

  if (stl->error) return;

  /* Open the file */
  fp = boost::nowide::fopen(file, "w");
  if(fp == NULL) {
    error_msg = (char*)
                malloc(81 + strlen(file)); /* Allow 80 chars+file size for message */
    sprintf(error_msg, "stl_write_ascii: Couldn't open %s for writing",
            file);
    perror(error_msg);
    free(error_msg);
    stl->error = 1;
    return;
  }

  fprintf(fp, "999\n%s\n", label);
  fprintf(fp, "0\nSECTION\n2\nHEADER\n0\nENDSEC\n");
  fprintf(fp, "0\nSECTION\n2\nTABLES\n0\nTABLE\n2\nLAYER\n70\n1\n\
0\nLAYER\n2\n0\n70\n0\n62\n7\n6\nCONTINUOUS\n0\nENDTAB\n0\nENDSEC\n");
  fprintf(fp, "0\nSECTION\n2\nBLOCKS\n0\nENDSEC\n");

  fprintf(fp, "0\nSECTION\n2\nENTITIES\n");

  for(i = 0; i < stl->stats.number_of_facets; i++) {
    fprintf(fp, "0\n3DFACE\n8\n0\n");
    fprintf(fp, "10\n%f\n20\n%f\n30\n%f\n",
            stl->facet_start[i].vertex[0](0), stl->facet_start[i].vertex[0](1),
            stl->facet_start[i].vertex[0](2));
    fprintf(fp, "11\n%f\n21\n%f\n31\n%f\n",
            stl->facet_start[i].vertex[1](0), stl->facet_start[i].vertex[1](1),
            stl->facet_start[i].vertex[1](2));
    fprintf(fp, "12\n%f\n22\n%f\n32\n%f\n",
            stl->facet_start[i].vertex[2](0), stl->facet_start[i].vertex[2](1),
            stl->facet_start[i].vertex[2](2));
    fprintf(fp, "13\n%f\n23\n%f\n33\n%f\n",
            stl->facet_start[i].vertex[2](0), stl->facet_start[i].vertex[2](1),
            stl->facet_start[i].vertex[2](2));
  }

  fprintf(fp, "0\nENDSEC\n0\nEOF\n");

  fclose(fp);
}

void
stl_clear_error(stl_file *stl) {
  stl->error = 0;
}

void
stl_exit_on_error(stl_file *stl) {
  if (!stl->error) return;
  stl->error = 0;
  stl_close(stl);
  exit(1);
}

int
stl_get_error(stl_file *stl) {
  return stl->error;
}