/*
 * LaTeX.c
 * pidgin-latex plugin
 *
 * This a plugin for Pidgin to display LaTeX formula in conversation
 *
 * PLEASE, send any comment, bug report, etc. to the trackers at sourceforge.net
 *
 * Copyright (C) 2006-2011 Benjamin Moll (qjuh@users.sourceforge.net)
 * some portions : Copyright (C) 2004-2006 Nicolas Schoonbroodt (nicolas@ffsa.be)
 *                 Copyright (C) 2004-2006 GRIm@ (thegrima@altern.org).
 * 		   Copyright (C) 2004-2006 Eric Betts (bettse@onid.orst.edu).
 *                 Copyright (C) 2008-2009 Martin Keßler (martin@moegger.de).
 * Windows port  : Copyright (C) 2005-2006 Nicolai Stange (nic-stange@t-online.de)
 * Other portions heavily inspired and copied from gaim sources
 * Copyright (C) 1998-2011 Pidgin developers pidgin.im
 *
 * 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; This document is under the scope of
 * the version 2 of the License, or 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 (see COPYING); if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA, 02110-1301, USA
 *
 */
#include "LaTeX.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <regex.h>
#include <sys/types.h>

#ifndef _WIN32
#include <sys/wait.h>
#endif

#ifndef MAX
#define MAX(a,b) ( (a) > (b) ? (a ): (b))
#endif

static PurplePlugin *me;

static void
open_log(PurpleConversation *conv)
{
	conv->logs = g_list_append(NULL, purple_log_new(conv->type == PURPLE_CONV_TYPE_CHAT ? PURPLE_LOG_CHAT :
                                                  PURPLE_LOG_IM, conv->name, conv->account,
                                                  conv, time(NULL), NULL));
}

#ifdef _WIN32
void win32_purple_notify_error(char *prep)
{
  char *errmsg=NULL;
  char *finalmsg=NULL;
  if(!FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (void*)&errmsg, 0, NULL))
  {
    purple_notify_error(me, "LaTeX" ,"Can't display error message.", "PidginLaTeX was unable to get the actual error message from Windows.");
    return;
  }
  
  if(prep)
  {
    finalmsg=malloc((strlen(errmsg)+ strlen(prep) + 3)*sizeof(char));
    if(!finalmsg)
    {
      purple_notify_error(me, "LaTeX", "Can't display error message.", "Not enough memory.");
      LocalFree(errmsg); /* we can't do anything more for you */
      return;
    }
    strcpy(finalmsg, prep);
    strcat(finalmsg, ": ");
    strcat(finalmsg, errmsg);
    LocalFree(errmsg);
  }
  else
  {
    finalmsg = malloc((strlen(errmsg)+1)*sizeof(char));
    if(!finalmsg)
    {
      purple_notify_error(me, "LaTeX", "Can't display error message.", "Not enough memory.");
      LocalFree(errmsg); /* we can't do anything more for you */
      return;
    }
    strcpy(finalmsg, errmsg);
    LocalFree(errmsg);
  }
  purple_notify_error(me, "LaTeX", "Error in execution of PidginLaTex!", finalmsg);
  free(finalmsg);
  return;
}
#endif

static char* getdirname(const char const *file)
{
  char *s=NULL;
  char *r=NULL;
  s=strrchr(file, G_DIR_SEPARATOR);
  if(!s) /* just a pure filename without dir? */
  {
    /* Here is no standard-, but GNU-bahaviour of getcwd assumed.
     Note that msdn.microsoft.com defines the same as GNU.
     */
    return getcwd(NULL,0);
  }
  
  s+=1; /* get the G_DIR_SEPARATOR at the end of directory-string */
  r=malloc(s-file+sizeof(char));
  if(r)
  {
    memcpy(r,file, s-file);
    r[(s-file)/sizeof(char)]='\0';
  }
  return r;
}

static char* getfilename(const char const *file)
{
  char *s=NULL;
  char *r=NULL;
  s=strrchr(file,G_DIR_SEPARATOR);
  if(!s)
  {
    r=malloc((strlen(file)+1)*sizeof(char));
    strcpy(r,file);
    return r;
  }
  
  s+=1;
  r=malloc((strlen(file)+1)*sizeof(char)+file-s);
  if(r)
  {
    memcpy(r,s,strlen(file)*sizeof(char)+file-s);
    r[strlen(file)+(file-s)/sizeof(char)]='\0';
  }
  return r;
}

char* searchPATH(const char const *file)
{
  char *cmd=NULL;
#ifdef _WIN32
  DWORD sz=0;
  DWORD sz2=0;
  
  sz=SearchPath(NULL, file, ".exe", 0, cmd, NULL);
  cmd = malloc((sz+1)*sizeof(TCHAR));
  if(cmd)
  {
    sz2=SearchPath(NULL, file, ".exe", sz+1, cmd, NULL);
    if(!sz2)
    {
      free(cmd);
      cmd=NULL;
    }
  }
#else
  cmd=malloc((strlen(file)+1)*sizeof(char));
  if(cmd)
    strcpy(cmd, file);
#endif
  
  return cmd;
}

#ifdef _WIN32 /* we could take system(), too, but this opens ugly console-windows within IM-Session*/
static DWORD execute(char *cmd, char *opts[], int copts)
{
  int i=0;
  int len=strlen(cmd) + 4;
  char *params=NULL;
  DWORD exitcode=STILL_ACTIVE;
  for(i=0; i<copts; ++i)
    len+=(strlen(opts[i]))*sizeof(char);
  
  params=malloc(len);
  if(!params)
    return -1;
  
  strcpy(params, "\"");
  strcat(params, cmd);
  strcat(params, "\" ");
  
  for(i=0; i<copts; ++i) {
    strcat(params, opts[i]);
    strcat(params, " ");
  }
  
  STARTUPINFO sup;
  PROCESS_INFORMATION pi;
  ZeroMemory( &sup, sizeof(sup) );
  sup.cb = sizeof(sup);
  ZeroMemory( &pi, sizeof(pi) );
  sup.wShowWindow = SW_HIDE;
  sup.dwFlags = STARTF_USESHOWWINDOW;
  
  if(!CreateProcess(NULL, params, NULL, NULL, TRUE, 0, NULL, NULL, &sup, &pi))
  {
    win32_purple_notify_error(cmd);
    free(params);
    return -1;
  }
  
  free(params);
  if(WAIT_OBJECT_0!=WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE))
  {
    win32_purple_notify_error(cmd);
    CloseHandle(pi.hProcess);
    CloseHandle(pi.hThread);
    return -1;
  }
  
  while(exitcode==STILL_ACTIVE)
  {
    if(!GetExitCodeThread(pi.hThread, &exitcode))
    {
      win32_purple_notify_error(cmd);
      return -1;
    }
    Sleep(10);
  }
  CloseHandle(pi.hProcess);
  CloseHandle(pi.hThread);
  return exitcode;
}
#else /* not windows, take exec(), because system() did ugly things with respect to the exitcode sometimes */
static int execute(char *cmd, char *opts[], int copts)
{
  int i=0;
  int exitcode=-1, exitstatus;
  pid_t child_id=0;
  char **opt=NULL;
  char *message=NULL;
  opt=malloc((copts+2)*sizeof(char*));
  
  opt[0]=cmd;
  for(i=0; i<copts;i++)
  {
    opt[i+1]=*(opts+i);
  }
  opt[copts+1]=NULL;
  
  purple_debug_misc("LaTeX", "'%s' started\n", cmd);
  
  child_id=fork();
  if(child_id==0) {
    exitcode=execvp(cmd,opt);
    free(opt);
//    free(cmd);
    exit(exitcode);
  }
  if( wait(&exitstatus)>0)
  {
    free(opt);
    if(WIFEXITED(exitstatus))
    {
      exitcode=WEXITSTATUS(exitstatus);
      purple_debug_info("LaTeX" ,"'%s' ended normally with exitcode '%d'\n", cmd, exitcode);
    }
    else
      purple_debug_error("LaTeX" ,"'%s' ended abnormally via the signal '%d'\n", cmd, WTERMSIG(exitstatus));
  }
  else {
    purple_debug_error("LaTeX", "while executing '%s' the following error occured: '%s'(%d)\n", cmd, strerror(errno), errno);
  }

  return exitcode;
}
#endif

static char* get_latex_cmd()
{
  return searchPATH("latex");
}

static char* get_dvips_cmd()
{
  return searchPATH("dvips");
}

static char* get_dvipng_cmd()
{
  return searchPATH("dvipng");
}

static char* get_convert_cmd()
{
#ifdef _WIN32
  /*open registry*/
  DWORD type;
  DWORD cbData;
  char *pData=NULL;
  HKEY hk=NULL;
  RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\ImageMagick\\Current",0,KEY_READ,&hk);
  RegQueryValueEx(hk, "BinPath", NULL, &type, NULL, &cbData);
  cbData=cbData + (1+12)*sizeof(char);
  pData=malloc(cbData);
  if(pData && RegQueryValueEx(hk, "BinPath", NULL, &type, pData, &cbData)==ERROR_SUCCESS)
  {
    CloseHandle(hk);
    strcat(pData,"\\convert.exe");
    return pData;
  }
  
  CloseHandle(hk);
  free(pData);
  return searchPATH("convert");
#else
  return searchPATH("convert");
#endif
}

static gboolean is_blacklisted(char *message)
{
  char *not_secure[NB_BLACKLIST] = BLACKLIST;
  int reti;
  int i;
  for (i = 0 ; i < NB_BLACKLIST ; i++)
  {  
    regex_t regex;
    char *begin_not_secure = malloc((strlen(not_secure[i])+18)*sizeof(char));
    strcpy(begin_not_secure,"\\\\begin\\W*{\\W*");
    strcat(begin_not_secure,not_secure[i]+0x01);
    strcat(begin_not_secure,"\\W*}");
    reti = regcomp(&regex, begin_not_secure, 0);
    reti = regexec(&regex, message, 0, NULL, 0);
    regfree(&regex);
    if (strstr(message, not_secure[i]) != NULL || reti!=REG_NOMATCH) return TRUE;  
  }
  return FALSE;
}

static gboolean latex_to_image(char *latex, char **file_png)
{
  FILE * texfile;
  char *file_tmp = NULL;
  char *tmpdir = NULL;
  char *cmdlatex = NULL;
  char *cmddvipng = NULL;
  char *file_tex;
  char *file_dvi;
  char *fgcolor, *bgcolor;
  gboolean exec_ok;
  
//  purple_debug_misc("LaTeX", "starting to transcribe part of the message\n");
  
  /* the following is new and related to temporary-filename-generation */
  texfile = purple_mkstemp(&file_tmp,TRUE);
  file_tex=malloc((strlen(file_tmp)+5)*sizeof(char));
  file_dvi=malloc((strlen(file_tmp)+5)*sizeof(char));
  *file_png=malloc((strlen(file_tmp)+5)*sizeof(char));
  fclose(texfile);
  if(!(file_tmp && file_tex && file_dvi && *file_png))
  {
    unlink(file_tmp);
    free(file_tmp);
    free(file_tex);
    free(file_dvi);
    free(*file_png);
    file_tex=file_dvi=*file_png=NULL;
    purple_notify_error(me, "LaTeX", "Error while running LaTeX!", "Couldn't create temporary files.");
    return FALSE;
  }
  
  strcpy(file_tex, file_tmp);
  strcat(file_tex, ".tex");
  strcpy(file_dvi, file_tmp);
  strcat(file_dvi, ".dvi");
  strcpy(*file_png, file_tmp);
  strcat(*file_png, ".png");
  unlink(file_tmp);
  free(file_tmp);
  
  fgcolor = (char*)malloc(16*sizeof(char));
  if( !strcmp(purple_prefs_get_string("/pidgin/conversations/fgcolor"),""))
  {
    strcpy(fgcolor, "0,0,0");
  }
  else
  {
    char const *pidgin_fgcolor;
    int rgb;
    pidgin_fgcolor = purple_prefs_get_string("/pidgin/conversations/fgcolor");
    purple_debug_info("LaTeX","found foregroundcolor '%s'\n",pidgin_fgcolor);
    rgb = strtol(pidgin_fgcolor+1,NULL,16);
    purple_debug_info("LaTeX", "numerical: %d\n", rgb);
    sprintf(fgcolor,"%d,%d,%d", rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff);
  }
  purple_debug_info("LaTeX", "using '%s' for foreground\n", fgcolor);
  
  bgcolor = (char*)malloc(16*sizeof(char));
  if( !strcmp(purple_prefs_get_string("/pidgin/conversations/bgcolor"),""))
  {
    strcpy(bgcolor, "255,255,255");
  }
  else
  {
    char const *pidgin_bgcolor;
    int rgb;
    pidgin_bgcolor = purple_prefs_get_string("/pidgin/conversations/bgcolor");
    purple_debug_info("LaTeX","found backgroundcolor '%s'\n",pidgin_bgcolor);
    rgb = strtol(pidgin_bgcolor+1,NULL,16);
    purple_debug_info("LaTeX", "numerical: %d\n", rgb);
    sprintf(bgcolor,"%d,%d,%d", rgb >> 16, (rgb >> 8) & 0xff, rgb & 0xff);
  }
  purple_debug_info("LaTeX", "using '%s' for background\n", bgcolor);
  
  if (! (texfile = fopen(file_tex, "w"))) return FALSE;
  fprintf(texfile, HEADER "%s" HEADER_COLOR "%s" HEADER_MATH "%s" FOOTER_MATH FOOTER, fgcolor, bgcolor, latex);
  fclose (texfile);
  free(fgcolor);
  
  tmpdir=getdirname(file_tex);
  /* generate commands, also new */  
  char *latexopts[2]={"--interaction=nonstopmode", file_tex};
  char *dvipngopts[8]={"-Q", "10", "-T", "tight", "--follow", "-o", *file_png, file_dvi};
  cmdlatex=get_latex_cmd();
  cmddvipng=get_dvipng_cmd();
  
  if (!tmpdir || chdir(tmpdir) || !cmdlatex || !cmddvipng )
  {
    if( tmpdir ) free(tmpdir);
    unlink(file_tex);
    free(file_tex);
    free(file_dvi);
    free(*file_png);
    file_dvi=*file_png=NULL;
    free(cmdlatex);
    free(cmddvipng);
    purple_notify_error(me, "LaTeX", "Error while trying to transcript LaTeX!", "couldn't find either latex or dvipng");
    return FALSE;
  }
  
  free(tmpdir);
  
//  purple_debug_misc("LaTeX", "beginning to start latex and dvipng\n");
  
  exec_ok = !(execute(cmdlatex, latexopts, 2) || execute(cmddvipng, dvipngopts, 8));
  
  free(cmdlatex);
  free(cmddvipng);
  
  unlink(file_tex);
  file_tex[strlen(file_tex)-4]='\0';
  
  strcat(file_tex, ".aux");
  unlink(file_tex);
  file_tex[strlen(file_tex)-4]='\0';
  strcat(file_tex, ".log");
  unlink(file_tex);
  unlink(file_dvi);
  
  free(file_tex);
  free(file_dvi);
  
  purple_debug_info("LaTeX", "image creation exited with status '%d'\n", !exec_ok);
  
  return exec_ok;
}

static gboolean analyse(char **tmp2, char *startdelim, char *enddelim, gboolean smileys)
{
  int pos1, pos2, idimg, formulas=0;
  char *ptr1, *ptr2;
  char *file_png=NULL;
  PurpleSmiley *the_smiley;
  
  purple_debug_misc("LaTeX", "starting to analyse the message: %s\n", *tmp2);
  
  ptr1 = strstr(*tmp2, startdelim);
  while(ptr1 != NULL)
  {
    char *tex, *tex2, *message, *filter, *idstring, *shortcut;
    gchar *filedata;
    size_t size;
    GError *error = NULL;
    
    pos1 = strlen(*tmp2) - strlen(ptr1);
    
    // Have to ignore the first 2 char ("$$") --> & [2]
    ptr2 = strstr(&ptr1[strlen(startdelim)], enddelim);
    if (ptr2 == NULL)
      return FALSE;
    
    pos2 = strlen(*tmp2) - strlen(ptr2) + strlen(enddelim);
    
    if ((tex = malloc(pos2 - pos1 - strlen(enddelim) - strlen(startdelim) + 1)) == NULL)
    {
      // Report the error
      purple_notify_error(me, "LaTeX" ,"Error while analysing the message!", "Out of memory!");
      return FALSE;
    }
    
    strncpy(tex, &ptr1[strlen(startdelim)], pos2 - pos1 - strlen(startdelim)-strlen(enddelim));
    tex[pos2-pos1-strlen(startdelim)-strlen(enddelim)] = '\0';
    
    // Replaced. Using official libpurple-function instead
    /*/ Pidgin transforms & to &amp; and I make the inverse transformation
    while ( (filter = strstr(tex, FILTER_AND) ) != NULL)
      strcpy(&tex[strlen(tex) - strlen(filter) + 1], &filter[5]);
    
    // Pidgin transforms < to &lt
    while ( (filter = strstr(tex, FILTER_LT) ) != NULL)
    {
      strcpy(&tex[strlen(tex) - strlen(filter)], "<");
      strcpy(&tex[strlen(tex) - strlen(filter) + 1], &filter[4]);
    }
    
    // Pidgin transforms > to &gt
    while ( (filter = strstr(tex, FILTER_GT) ) != NULL)
    {
      strcpy(&tex[strlen(tex) - strlen(filter)], ">");
      strcpy(&tex[strlen(tex) - strlen(filter) + 1], &filter[4]);
    }
    
    // <br> filter
    while ( (filter = strstr(tex, FILTER_BR) ) != NULL)
      strcpy(&tex[strlen(tex) - strlen(filter)], &filter[4]);//*/
    
    tex2 = (char*)malloc((strlen(tex)+1)*sizeof(char));
    strcpy(tex2, tex);
    tex = purple_unescape_html(tex2);
    
    purple_debug_misc("LaTeX", "Found LaTeX-Code: %s\n", tex);
    
    shortcut = (char*)malloc((strlen(tex2)+5)*sizeof(char));
    strcpy(shortcut,"$$");
    strcat(shortcut, tex2);
    strcat(shortcut, "$$");
    free(tex2);
    
    if (smileys && purple_smileys_find_by_shortcut(shortcut)!=NULL) {
      free(tex);
      free(shortcut);
      ptr1 = strstr(&(*tmp2)[pos2], startdelim);
      continue;
    }
    
    // Creates the image in file_png
    if (!latex_to_image(tex, &file_png))
    {
      free(tex);
      free(shortcut);
      return FALSE;
    }
    
    free(tex);
    
    // loading image
    if (!g_file_get_contents(file_png, &filedata, &size, &error))
    {
      purple_notify_error(me, "LaTeX", "Error while reading the generated image!", error->message);
      g_error_free(error);
      free(shortcut);
      return FALSE;
    }
    
    unlink(file_png);
    
    idimg = purple_imgstore_add_with_id(filedata, MAX(1024,size), getfilename(file_png));
    filedata = NULL;
    free(file_png);
    
    if (idimg == 0)
    {
      purple_notify_error(me, "LaTeX", "Error while reading the generated image!", "Failed to store image.");
      free(shortcut);
      return FALSE;
    }
    
    if (smileys)
    {
      the_smiley = purple_smiley_new(purple_imgstore_find_by_id(idimg),shortcut);
      pidgin_smiley_add_to_list(the_smiley);
      free(shortcut);
      
      // making new message
      if ((message = malloc (strlen(*tmp2) + 1)) == NULL)
      {
        purple_notify_error(me, "LaTeX", "Error while composing the message!", "couldn't make the message.");
        return FALSE;
      }
      
      ptr1 = strstr(&(*tmp2)[pos2], startdelim);
      continue;
    }
    else
    {
      free(shortcut);
      idstring = malloc(10);
      sprintf(idstring, "%d\0", idimg);
    
      // making new message
      if ((message = malloc (strlen(*tmp2) - pos2 + pos1 + strlen(idstring) + strlen(IMG_BEGIN) + strlen(IMG_END) + 1)) == NULL)
      {
        purple_notify_error(me, "LaTeX", "Error while composing the message!", "couldn't make the message.");
        free(idstring);
        return FALSE;
      }
    
      if (pos1 > 0)
      {
        strncpy(message, *tmp2, pos1);
        message[pos1] = '\0';
        strcat(message, IMG_BEGIN);
      } else
        strcpy(message, IMG_BEGIN);
    
      strcat(message, idstring);
      strcat(message, IMG_END);
      free(idstring);
    }
    
    if (pos2 < strlen(*tmp2))
      strcat(message, &ptr2[strlen(enddelim)]);
    
    free(*tmp2);
    if ((*tmp2 = malloc(strlen(message)+1)) == NULL)
    {
      purple_notify_error(me, "LaTeX", "Error while composing the message!", "couldn't split the message.");
      return FALSE;
    }
    
    strcpy(*tmp2, message);
    free(message);
    
    formulas++;
    
    ptr1 = strstr(&(*tmp2)[pos2], startdelim);
  }
  if (!smileys && formulas>0)
    return TRUE;
  else
    return FALSE;
}

static gboolean pidgin_latex_write(PurpleConversation *conv, const char *nom, char *message, PurpleMessageFlags messFlag, char *original)
{
  gboolean logflag;
	
  // writing log
  logflag = purple_conversation_is_logging(conv);
  
  if (logflag)
  {
    GList *log;
    
    if (conv->logs == NULL)
      open_log(conv);
    
    log = conv->logs;
    while (log != NULL) {
      if (strcmp(purple_prefs_get_string("/purple/logging/format"), "html") == 0)
        purple_log_write((PurpleLog *)log->data, messFlag, nom, time(NULL), message);
      else
        purple_log_write((PurpleLog *)log->data, messFlag, nom, time(NULL), original);
      log = log->next;
    }
    purple_conversation_set_logging(conv,FALSE);
  }
  
  if(purple_conversation_get_type(conv) == PURPLE_CONV_TYPE_CHAT)
    purple_conv_chat_write(PURPLE_CONV_CHAT(conv), nom, message, messFlag, time(NULL));
  else if(purple_conversation_get_type(conv) == PURPLE_CONV_TYPE_IM)
    purple_conv_im_write(PURPLE_CONV_IM(conv), nom, message, messFlag, time(NULL));
  
  if (logflag)
    purple_conversation_set_logging(conv,TRUE);
  
  return FALSE;
}

static void message_send(PurpleConversation *conv, char **buffer)
{
  char *tmp2;
  gboolean smileys;
  
  purple_debug_info("LaTeX", "Sending Message: %s\n", *buffer);
  
  // if nothing to do
  if (strstr(*buffer,KOPETE_TEX) == NULL)
  {
    return;
  }
  
  if (is_blacklisted(*buffer))
  {
    purple_debug_info("LaTeX", "message not analysed, because it contained blacklisted code.\n");
    return;
  }
  
  if((tmp2 = malloc(strlen(*buffer)+1)) == NULL)
  {
    // Notify Error
    purple_notify_error(me, "LaTeX" ,"Error while analysing the message!", "Out of memory!");
    return;
  }
  
  smileys = purple_conversation_get_features(conv) & PURPLE_CONNECTION_ALLOW_CUSTOM_SMILEY;
  
  purple_debug_misc("LaTeX", "smiley support: %s\n", smileys ? "yes" : "no");
  
  if (smileys)
  {  
    strcpy(tmp2,*buffer);
    
    if(analyse(&tmp2, KOPETE_TEX, KOPETE_TEX, smileys))
    {
      free(*buffer);
      *buffer = tmp2;
    }
    else {
      free(tmp2);
    }
  }
}

static void message_send_chat(PurpleAccount *account, char **buffer, int id)
{
  PurpleConnection *conn = purple_account_get_connection(account);
  message_send(purple_find_chat(conn, id), buffer);
}

static void message_send_im(PurpleAccount *account, const char *who, char **buffer)
{
  message_send(purple_find_conversation_with_account( PURPLE_CONV_TYPE_IM, who, account), buffer);
}

static gboolean message_receive(PurpleAccount *account, const char *who, char **buffer, PurpleConversation *conv, PurpleMessageFlags flags)
{
  char *tmp2;
//  gboolean smileys;
  
  purple_debug_info("LaTeX", "Writing Message: %s\n", *buffer);
  
  // if nothing to do
  if (strstr(*buffer,KOPETE_TEX) == NULL)
  {
    return FALSE;
  }
  
  if (is_blacklisted(*buffer))
  {
    purple_debug_info("LaTeX", "message not analysed, because it contained blacklisted code.\n");
    return FALSE;
  }
  
  if((tmp2 = malloc(strlen(*buffer)+1)) == NULL)
  {
    // Notify Error
    purple_notify_error(me, "LaTeX" ,"Error while analysing the message!", "Out of memory!");
    return FALSE;
  }
  
  strcpy(tmp2,*buffer);
  
//  smileys = purple_conversation_get_features(conv) & PURPLE_CONNECTION_ALLOW_CUSTOM_SMILEY;
  
//  purple_debug_misc("LaTeX", "smiley support: %s\n", smileys ? "yes" : "no");
  
  if (analyse(&tmp2, KOPETE_TEX, KOPETE_TEX, FALSE))
  {
    pidgin_latex_write(conv, who, tmp2, flags, *buffer);
    
    free(tmp2);
    return TRUE;
  }
  
  free(tmp2);
  
  return FALSE;
}

static gboolean plugin_load(PurplePlugin *plugin)
{
  void *conv_handle = purple_conversations_get_handle();
  
  me = plugin;
  
  purple_signal_connect(conv_handle, "sending-im-msg",
                        plugin, PURPLE_CALLBACK(message_send_im), NULL);
  
  purple_signal_connect(conv_handle, "sending-chat-msg",
                        plugin, PURPLE_CALLBACK(message_send_chat), NULL);
  
  purple_signal_connect(conv_handle, "writing-im-msg",
                        plugin, PURPLE_CALLBACK(message_receive), NULL);
  
  purple_signal_connect(conv_handle, "writing-chat-msg",
                        plugin, PURPLE_CALLBACK(message_receive), NULL);
  
  purple_debug_info("LaTeX", "LaTeX loaded\n");
  
  return TRUE;
}

static gboolean plugin_unload(PurplePlugin * plugin)
{
  void *conv_handle = purple_conversations_get_handle();
  
  purple_signal_disconnect(conv_handle, "sending-im-msg", plugin, PURPLE_CALLBACK(message_send_im));
  purple_signal_disconnect(conv_handle, "sending-chat-msg", plugin, PURPLE_CALLBACK(message_send_chat));
  purple_signal_disconnect(conv_handle, "writing-im-msg", plugin, PURPLE_CALLBACK(message_receive));
  purple_signal_disconnect(conv_handle, "writing-chat-msg", plugin, PURPLE_CALLBACK(message_receive));
  
  me = NULL;
  
  purple_debug_info("LaTeX", "LaTeX unloaded\n");
  
  return TRUE;
}


static PurplePluginInfo info =
{
  PURPLE_PLUGIN_MAGIC,
  PURPLE_MAJOR_VERSION,
  PURPLE_MINOR_VERSION,
  PURPLE_PLUGIN_STANDARD,                             /**< type           */
  PIDGIN_PLUGIN_TYPE,                                             /**< ui_requirement */
  0,                                                /**< flags          */
  NULL,                                             /**< dependencies   */
  PURPLE_PRIORITY_DEFAULT,                            /**< priority       */
  
  LATEX_PLUGIN_ID,                                  /**< id             */
  "LaTeX",                                      /**< name           */
  "1.4",                                        /**< version        */
  /**  summary        */
  "To display LaTeX formula into Pidgin conversation.",
  /**  description    */
  "Put LaTeX-code between $$ ... $$ markup to have it displayed as Picture in your conversation.\nRemember that your contact needs an similar plugin or else he will just see the pure LaTeX-code\nYou must have LaTeX and dvipng installed (in your PATH)",
  "Benjamin Moll <qjuh@users.sourceforge.net>\nNicolas Schoonbroodt <nicolas@ffsa.be>\nNicolai Stange <nic-stange@t-online.de>",   /**< author       */
  WEBSITE,                                          /**< homepage       */
  plugin_load,                                      /**< load           */
  plugin_unload,                                    /**< unload         */
  NULL,                                             /**< destroy        */
  NULL,                                             /**< ui_info        */
  NULL,                                             /**< extra_info     */
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};



static void
init_plugin(PurplePlugin *plugin)
{
}

PURPLE_INIT_PLUGIN(LaTeX, init_plugin, info)