/*****************************************************************************/
/*  CrossFire, A roguelike realtime multiplayer game                         */
/*****************************************************************************/

/*
 *  This code is placed under the GNU General Public Licence (GPL)
 *
 *  Copyright (C) 2006      by Marc Lehmann <crossfire@schmorp.de>
 *                                                                          
 *  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 
 */

#include "global.h" // bug in cfperl.h, doesn't include interface_class stuff
#include "logger.h"
#include "cfperl.h"
#include "kw_hash.h"

object_freezer::object_freezer ()
: dynbuf (128 * 1024, 64 * 1024)
{
  av = newAV ();
}

object_freezer::~object_freezer ()
{
  SvREFCNT_dec (av);
}

void
object_freezer::put (attachable *ext)
{
  ext->optimise ();

  if (ext->self)
    {
      int idx = AvFILLp ((AV *)av) + 1;
      av_store (av, idx, newRV_inc ((SV *)ext->self));

      add ((void *)"oid ", 4);
      add ((sint32)idx);
      add ('\n');
    }
}

bool
object_freezer::save (const char *path)
{
  CALL_BEGIN (3);
  CALL_ARG_SV (newSVpv (path, 0));
  CALL_ARG_SV (newRV_noinc (newSVpvn ((char *)linearise (), size ())));
  CALL_ARG_SV (newRV_inc ((SV *)av));
  CALL_CALL ("cf::object_freezer_save", G_VOID | G_DISCARD);
  CALL_END;
}

char *
object_freezer::as_string ()
{
  CALL_BEGIN (2);
  CALL_ARG_SV (newRV_noinc (newSVpvn ((char *)linearise (), size ())));
  CALL_ARG_SV (newRV_inc ((SV *)av));
  CALL_CALL ("cf::object_freezer_as_string", G_SCALAR);

  char *res = count > 0
                ? strdup (SvPVX (POPs))
                : strdup ("[fatal error]");

  CALL_END;

  return res;
}

int
fprintf (object_freezer &freezer, const char *format, ...)
{
  va_list ap;

  va_start (ap, format);

  int len = vsnprintf ((char *)freezer.force (1024), 1024, format, ap);

  if (len >= 0)
    freezer.alloc (len);

  va_end (ap);
}

int
fputs (const char *s, object_freezer &freezer)
{
  freezer.add (s);
}

static const char thawer_eof[] = "\n\n\n\0\0\0";

object_thawer::object_thawer (const char *path)
: name (strdup (path))
{
  static const char eof[] = "\n\n\n\0\0\0";

  av   = 0;
  text = 0;
  line = 0;

  if (path)
    {
      CALL_BEGIN (1);
      CALL_ARG_SV (newSVpv (path, 0));
      CALL_CALL ("cf::object_thawer_load", G_ARRAY);

      if (count == 2)
        {
          // second value - perl objects
          {
            SV *sv = POPs;
            if (SvROK (sv))
              av = (AV *)SvREFCNT_inc (SvRV (sv));
          }

          // first value - text part, pad with 3 zeroes
          {
            SV *sv = POPs;
            STRLEN len;
            char *sv_ = SvPVbyte (sv, len);
            text = newSV (len + sizeof (eof));
            SvCUR_set (text, len);
            memcpy (SvPVX (text), sv_, len);
            memcpy (SvEND (text), eof, sizeof (eof)); // just to be sure

            line = SvPVX (text);
          }
        }

      CALL_END;
    }
}

object_thawer::object_thawer (const char *data, AV *perlav)
: name (strdup ("(memory stream"))
{
  av   = perlav;
  text = newSVpv (data, 0);
  sv_catpv (text, thawer_eof);
  line = SvPVbyte_nolen (text);
}

void
object_thawer::get (attachable *obj, int oid)
{
  if (!av || oid < 0) // this is actually an error of sorts
    return;

  SV **svp = av_fetch ((AV *)av, oid, 0);

  if (!svp || !SvROK (*svp))
    {
      printf ("trying to thaw duplicate or never-issued oid %d, ignoring.\n", oid);
      return;
    }

  if (!SvROK (*svp))
    {
      LOG (llevError, "deserialised perl object is not an RV");
      return;
    }

  HV *hv = (HV *)SvRV (*svp);

  if (SvTYPE (hv) != SVt_PVHV)
    {
      LOG (llevError, "deserialised perl object is not a PVHV");
      return;
    }

  if (obj->self)
    {
      // the hard way(?)

      CALL_BEGIN (2);
      CALL_ARG_SV (newRV_inc ((SV *)obj->self));
      CALL_ARG_SV (newRV_inc ((SV *)hv));
      PUTBACK;
      call_method ("thawer_merge", G_DISCARD | G_EVAL);
      SPAGAIN;
      CALL_END;
    }
  else
    {
      // the easy way(?)

      obj->self = hv;
      SvRV_set (*svp, &PL_sv_undef);

      sv_magicext ((SV *)obj->self, 0, PERL_MAGIC_ext, &attachable::vtbl, (char *)obj, 0);

      // borrow a refcount for the perl object
      obj->flags |= attachable::F_BORROWED;
      obj->refcnt_dec ();
    }

  obj->reattach ();
}

object_thawer::~object_thawer ()
{
  if (text) SvREFCNT_dec (text);
  if (av)   SvREFCNT_dec (av);

  free ((void *)name);
}

char *
fgets (char *s, int n, object_thawer &thawer)
{
  char *p = thawer.line;
  char *q = s;

  if (!p)
    return 0;

  while (--n)
    {
      if (!*p)
        break;

      *q++ = *p;

      if (*p++ == '\n')
        break;
    }

  *q = 0;
  thawer.line = p;

  return s == q ? 0 : s;
}

keyword
object_thawer::get_kv ()
{
  if (!line)
    return KW_EOF;

  for (;;)
    {
      char *p = line;

      if (!*p)
        return KW_EOF;

      // parse keyword
      while (*p > ' ')
        p++;

      int klen = p - line;

      if (*p++ != '\n')
        {
          // parse value
          while (*(unsigned char *)p <= ' ' && *p != '\n') // skip 0x01 .. 0x20
            ++p;

          last_value = p;

          while (*p != '\n')
            p++;

          *p++ = 0;
        }
      else
        last_value = 0;

      line [klen] = 0;
      keyword_idx *kw = kw_lex::match (line, klen);

      //printf ("KV %d<%s,%s>\n", kw ? kw->index : 0, line, last_value);//D

      last_keyword = line;
      line = p;

      if (kw)
        return kw->index;
      else if (!*last_keyword || *last_keyword == '#')
        ; // empty/comment line
      else
        return KW_ERROR;
    }
}

void
object_thawer::skip_kv (keyword kw)
{
  shstr ml;

  switch (kw)
    {
      case KW_msg:     get_ml (KW_endmsg    , ml); break;
      case KW_lore:    get_ml (KW_endlore   , ml); break;
      case KW_maplore: get_ml (KW_endmaplore, ml); break;
    }
}
 
void
object_thawer::get (shstr &sh) const
{
  if (last_value)
    sh = last_value;
  else
    {
      sh = "<value missing>";
      LOG (llevError, "keyword \"%s\" requires value, substituting with <value missing>\n", last_keyword);//TODO: add filename
    }
}

void
object_thawer::get_ml (keyword kend, shstr &sh)
{
  char kw[128];

  int klen = keyword_len [kend];

  kw [0] = '\n';
  memcpy (kw + 1, keyword_str [kend], klen);
  kw [klen + 1] = '\n';
  kw [klen + 2] = 0;

  // first test for completely empty msg... "endXXX\n"
  if (!strncmp (line, kw + 1, klen + 1))
    {
      sh = 0;

      line += klen + 1;

      return;
    }
  else
    {
      // multi-line strings are delimited by "\nendXXX\n" or "endXXX\n" (NULL)

      char *end = strstr (line, kw);

      if (!end)
        {
          sh = 0;
          return;
        }

      *end = 0;
      sh = line;

      line = end + keyword_len [kend] + 1;

      while (*line++ != '\n')
        ;
    }
}

sint32
object_thawer::get_sint32 () const
{
  char *p = last_value;

  if (!p)
    return 0;

  sint32 val = 0;
  bool negate;

  if (*p == '-')
    {
      negate = true;
      ++p;
    }
  else
    negate = false;

  do
    {
      val *= 10;
      val += *p++ - '0';
    }
  while (*p);

  return negate ? -val : val;
}

sint64
object_thawer::get_sint64 () const
{
  return last_value ? atoll (last_value) : 0;
}

double
object_thawer::get_double () const
{
  return last_value ? atof (last_value) : 0;
}