#ifndef haf_write_H
#define haf_write_H

/* Writing the half-edge representation of 2D meshes. */
/* Last edited on 2025-01-09 23:08:04 by stolfi */

#define half_write_H_copyright \
  "Copyright (C) 2023 Jorge Stolfi, UNICAMP.\n\n" jslibs_copyright

#include <stdint.h>
#include <stdio.h>

#include <bool.h>
#include <vec.h>

#include <haf.h>

void haf_write_arc(FILE *wr, haf_arc_t a, uint32_t width);
  /* Writes the arc {a} to {wr} in the format "{eid}:{db}" where {eid}
    is {haf_edge_id(a)}, and {db} is the direction bit {haf_dir_bit(a)} (0 or 1).
    The {eid} is padded with spaces at left to have at least {width}
    characters. */

#define haf_write_FILE_TYPE "half-edge"
#define haf_write_FILE_VERSION "2023-10-05"

void haf_write_map
  ( FILE *wr,
    haf_edge_count_t NE,
    haf_edge_t ed[],
    haf_edge_id_t eid0,
    haf_arc_count_t NR,
    haf_arc_t root[]
  );
  /* Writes to {wr} a description of the half-edge structure.

    The parameter {ed[0..NE-1]} must list all the undirected edges of the 
    structure, with no repetitions.   The id of edge {ed[ke]} must be {eid0 + ke}. 

    The arcs {root[0..NR-1]} are optional selected arcs that are
    supposed to be handles to the structure. Typically they comprise
    exactly one arc on each connected component of the structure.
    
    The file format is a header with four lines

      "begin {haf_write_FILE_TYPE} (format of {haf_write_FILE_VERSION})"
      "edges = {NE}"
      "edge_id_min = {eid0}"

    followed by {NE} lines with "{ke} {a[ke].lnext} {a[ke].sym.lnext}",
    for {ke} in {0..NE-1]}, followed by a line
    
       "roots = {NR}"

    then {NR} lines with "{kr} {root[kr]}" for {kr} in {0..NR-1},
    then finally the file trailer line 
   
      "end {haf_write_FILE_TYPE}"
    
  */

#endif