//  This may look like C code, but it is really -*- C++ -*-

//  ------------------------------------------------------------------
//  The Goldware Library
//  Copyright (C) 1990-1999 Odinn Sorensen
//  ------------------------------------------------------------------
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Library General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library 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
//  Library General Public License for more details.
//
//  You should have received a copy of the GNU Library 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
//  ------------------------------------------------------------------
//  $Id$
//  ------------------------------------------------------------------
//  JAM msgbase implementation, initialization.
//  ------------------------------------------------------------------


//  ------------------------------------------------------------------

#include <gdbgerr.h>
#include <gmemdbg.h>
#include <gdbgtrk.h>
#include <gstrall.h>
#include <gcrcall.h>

#include <gmojamm.h>


//  ------------------------------------------------------------------

JamWide* jamwide = NULL;
JamData* jamdata = NULL;
int      jamdatano = 0;


//  ------------------------------------------------------------------

void JamExit() {

  throw_xrelease(jamwide);
  throw_xrelease(jamdata);
}


//  ------------------------------------------------------------------

void JamInit(const char* jampath, int harddelete, int jamsmapihw) {

  GFTRK("JamInit");

  jamdata = (JamData*)throw_calloc(3, sizeof(JamData));
  jamwide = (JamWide*)throw_calloc(1, sizeof(JamWide));

  jamwide->jampath = jampath;
  jamwide->harddelete = harddelete;
  jamwide->smapihw = jamsmapihw;

  // Calculate CRC32 of our username for the lastreads
  INam _name;
  jamstrlwr(strcpy(_name, WideUsername[0]));
  jamwide->userid = jamwide->usercrc = strCrc32(_name, NO, CRC32_MASK_CCITT);

  // Enable replies lookahead feature
  jamwide->lookreplies = true;

  GFTRK(0);
}


//  ------------------------------------------------------------------

void JamArea::open() {

  GFTRK("JamArea::open");

  isopen++;
  if(isopen > 2) {
    WideLog->ErrTest();
    WideLog->printf("! Trying to open a JAM msgbase more than twice.");
    WideLog->printf(": %s, %s.", echoid(), path());
    WideLog->printf("+ Info: This indicates a serious bug.");
    WideLog->printf("+ Advice: Report to the Author immediately.");
    TestErrorExit();
  }
  if(isopen == 1) {
    if(ispacked()) {
      isopen--;
      const char* newpath = Unpack(path());
      if(newpath == NULL)
        packed(false);
      set_real_path(newpath ? newpath : path());
      isopen++;
    }
    data_open();
    open_area();
    scan();
  }

  GFTRK(0);
}


//  ------------------------------------------------------------------

void JamArea::save_lastread() {

  GFTRK("JamArea::save_lastread");

  // Lock area while we are updating
  lock();

  // Update .JLR record
  data->lastrec.lastread = Msgn->CvtReln(lastread);
  if(data->lastrec.lastread > data->lastrec.highread)
    data->lastrec.highread = data->lastrec.lastread;

  // Seek to users lastread position
  lseekset(data->fhjlr, data->lastpos, sizeof(JamLast));

  // Write the .JLR record
  write(data->fhjlr, &data->lastrec, sizeof(JamLast));

  // Update header info record
  data->hdrinfo.modcounter++;
  if(data->hdrinfo.basemsgnum == 0)
    data->hdrinfo.basemsgnum = 1;

  // Seek to beginning of the .JHR
  lseekset(data->fhjhr, 0);

  // Write header info record
  write(data->fhjhr, &data->hdrinfo, sizeof(JamHdrInfo));

  // Update userfile
  if(data->timesposted) {

    // Currently not supported ...
    data->timesposted = 0;
  }

  // Unlock area
  unlock();

  GFTRK(0);
}


//  ------------------------------------------------------------------

void JamArea::close() {

  GFTRK("JamArea::close");

  if(isopen) {
    if(isopen == 1) {
      if(data->fhjhr != -1)
        save_lastread();
      if(data->islocked)
        unlock();
      raw_close();
      Msgn->Reset();
      data_close();
      if(ispacked()) {
        CleanUnpacked(real_path());
      }
    }
    isopen--;
  }
  else {
    WideLog->ErrTest();
    WideLog->printf("! Trying to close an already closed JAM msgbase.");
    WideLog->printf(": %s, %s.", echoid(), path());
    WideLog->printf("+ Info: This indicates a potentially serious bug.");
    WideLog->printf("+ Advice: Report to the Author immediately.");
    TestErrorExit();
  }
  
  GFTRK(0);
}


//  ------------------------------------------------------------------

void JamArea::suspend() {

  GFTRK("JamArea::suspend");

  save_lastread();
  raw_close();

  GFTRK(0);
}


//  ------------------------------------------------------------------

void JamArea::resume() {

  GFTRK("JamSuspendOff");

  raw_open();

  GFTRK(0);
}


//  ------------------------------------------------------------------

char *jamstrlwr(char *str) {

  char *p = str;
  while(*p) {
    if((*p >= 'A') && (*p <= 'Z'))
      *p = *p - 'A' + 'a';
    ++p;
  }
  return str;
}

//  ------------------------------------------------------------------
