/*
 * main.c: command line parsing and top level
 */

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

static void dbg_prtsource(paragraph * sourceform);
static void dbg_prtwordlist(int level, word * w);
static void dbg_prtkws(keywordlist * kws);

int main(int argc, char **argv)
{
  char **infiles;
  char *outfile;
  int nfiles;
  int nogo;
  int errs;
  int reportcols;
  int debug;

  /*
   * Set up initial (default) parameters.
   */
  infiles = mknewa(char *, argc);
  outfile = NULL;
  nfiles = 0;
  nogo = errs = FALSE;
  reportcols = 0;
  debug = 0;

  if (argc == 1)
  {
    usage();
    exit(EXIT_SUCCESS);
  }

  /*
   * Parse command line arguments.
   */
  while (--argc)
  {
    char *p = *++argv;
    if (*p == '-')
    {
      /*
       * An option.
       */
      while (p && *++p)
      {
        char c = *p;
        switch (c)
        {
        case '-':
          /*
           * Long option.
           */
          {
            char *opt, *val;
            opt = p++;          /* opt will have _one_ leading - */
            while (*p && *p != '=')
              p++;              /* find end of option */
            if (*p == '=')
            {
              *p++ = '\0';
              val = p;
            } else
              val = NULL;
            if (!strcmp(opt, "-version"))
            {
              showversion();
              nogo = TRUE;
            } else if (!strcmp(opt, "-licence") ||
                       !strcmp(opt, "-license"))
            {
              licence();
              nogo = TRUE;
            } else if (!strcmp(opt, "-output"))
            {
              if (!val)
                errs = TRUE, error(err_optnoarg, opt);
              else
                outfile = val;
            } else if (!strcmp(opt, "-precise"))
            {
              reportcols = 1;
            } else
            {
              errs = TRUE, error(err_nosuchopt, opt);
            }
          }
          p = NULL;
          break;
        case 'V':
        case 'L':
        case 'P':
        case 'd':
          /*
           * Option requiring no parameter.
           */
          switch (c)
          {
          case 'V':
            showversion();
            nogo = TRUE;
            break;
          case 'L':
            licence();
            nogo = TRUE;
            break;
          case 'P':
            reportcols = 1;
            break;
          case 'd':
            debug = TRUE;
            break;
          }
          break;
        case 'o':
          /*
           * Option requiring parameter.
           */
          p++;
          if (!*p && argc > 1)
            --argc, p = *++argv;
          else if (!*p)
          {
            char opt[2];
            opt[0] = c;
            opt[1] = '\0';
            errs = TRUE, error(err_optnoarg, opt);
          }
          /*
           * Now c is the option and p is the parameter.
           */
          switch (c)
          {
          case 'o':
            outfile = p;
            break;
          }
          p = NULL;             /* prevent continued processing */
          break;
        default:
          /*
           * Unrecognised option.
           */
          {
            char opt[2];
            opt[0] = c;
            opt[1] = '\0';
            errs = TRUE, error(err_nosuchopt, opt);
          }
        }
      }
    } else
    {
      /*
       * A non-option argument.
       */
      infiles[nfiles++] = p;
    }
  }

  if (errs)
    exit(EXIT_FAILURE);
  if (nogo)
    exit(EXIT_SUCCESS);

  /*
   * Do the work.
   */
  if (nfiles == 0)
  {
    error(err_noinput);
    usage();
    exit(EXIT_FAILURE);
  }

  {
    input in;
    paragraph *sourceform, *p;
    indexdata *idx;
    keywordlist *keywords;

    in.filenames = infiles;
    in.nfiles = nfiles;
    in.currfp = NULL;
    in.currindex = 0;
    in.npushback = in.pushbacksize = 0;
    in.pushback = NULL;
    in.reportcols = reportcols;
    in.stack = NULL;

    idx = make_index();

    sourceform = read_input(&in, idx);
    if (!sourceform)
      exit(EXIT_FAILURE);

    sfree(in.pushback);

    mark_attr_ends(sourceform);

    sfree(infiles);

    keywords = get_keywords(sourceform);
    if (!keywords)
      exit(EXIT_FAILURE);
    gen_citations(sourceform, keywords);
    subst_keywords(sourceform, keywords);

    for (p = sourceform; p; p = p->next)
      if (p->type == para_IM)
        index_merge(idx, TRUE, p->keyword, p->words);

    build_index(idx);


    if (debug)
    {
      index_debug(idx);
      dbg_prtkws(keywords);
      dbg_prtsource(sourceform);
    }

    xhtml_backend(sourceform, keywords, idx);

    free_para_list(sourceform);
    free_keywords(keywords);
    cleanup_index(idx);
  }

  return 0;
}

static void dbg_prtsource(paragraph * sourceform)
{
  /*
   * Output source form in debugging format.
   */

  paragraph *p;
  for (p = sourceform; p; p = p->next)
  {
    wchar_t *wp;
    printf("para %d ", p->type);
    if (p->keyword)
    {
      wp = p->keyword;
      while (*wp)
      {
        putchar('\"');
        for (; *wp; wp++)
          putchar(*wp);
        putchar('\"');
        if (*++wp)
          printf(", ");
      }
    } else
      printf("(no keyword)");
    printf(" {\n");
    dbg_prtwordlist(1, p->words);
    printf("}\n");
  }
}

static void dbg_prtkws(keywordlist * kws)
{
  /*
   * Output keywords in debugging format.
   */

  int i;
  keyword *kw;

  for (i = 0; (kw = index234(kws->keys, i)) != NULL; i++)
  {
    wchar_t *wp;
    printf("keyword ");
    wp = kw->key;
    while (*wp)
    {
      putchar('\"');
      for (; *wp; wp++)
        putchar(*wp);
      putchar('\"');
      if (*++wp)
        printf(", ");
    }
    printf(" {\n");
    dbg_prtwordlist(1, kw->text);
    printf("}\n");
  }
}

static void dbg_prtwordlist(int level, word * w)
{
  for (; w; w = w->next)
  {
    wchar_t *wp;
    printf("%*sword %d ", level * 4, "", w->type);
    if (w->text)
    {
      printf("\"");
      for (wp = w->text; *wp; wp++)
        putchar(*wp);
      printf("\"");
    } else
      printf("(no text)");
    if (w->alt)
    {
      printf(" alt = {\n");
      dbg_prtwordlist(level + 1, w->alt);
      printf("%*s}", level * 4, "");
    }
    printf("\n");
  }
}