// BotInterp.C  -*- C++ -*-
// Copyright (c) 1998 Etienne BERNARD
// Copyright (C) 2002 Clinton Ebadi

// 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.

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "Utils.H"
#include "Bot.H"
#include "BotInterp.H"

#ifdef USESCRIPTS

#include <libguile.h>
extern "C"
{
#include <libguile/regex-posix.h>
}

BotInterp::BotInterp(Bot *b, String fn)
  : bot(b), counter(0)
{
  logPort = scm_open_file(Utils::str2scm (fn),
                          Utils::str2scm ("a"));
  scm_gc_protect_object(logPort);
}

void
BotInterp::Execute(String command)
{
  Interp::Execute(bot, command);
}

void
BotInterp::LoadScript(String filename)
{
  Interp::LoadScript(bot, filename);
}

SCM
BotInterp::ScriptLog()
{
  return logPort;
}

namespace
{
  bool hptr_lt (const Hook* h, const Hook* h1)
    // Hook Pointer less than
    // Used to sort the Hooks list
  { return *h < *h1; }
}

bool
BotInterp::AddHook(int hooktype, SCM regex, SCM function, int pri, bool fall,
		   String name) {
  if (scm_string_p(regex) == SCM_BOOL_F)
    return false;
  String rx = Utils::to_upper (Utils::scm2str (regex));
  SCM r = scm_make_regexp(regex,
                          scm_listify (gh_lookup("regexp/icase"),
                                  SCM_UNDEFINED));
  scm_gc_protect_object(r);
  scm_gc_protect_object(function);
  // First, we check if an hook doesn't exist yet
  std::list<Hook *>::iterator it = hooksMap[hooktype].begin();
  std::list<Hook *>::iterator it2 = hooksMap[hooktype].end();

  for ( ; it != it2; ++it)
    // It exists, we replace it.
    if ((*it)->regex_str == rx && (*it)->name == name) {
      scm_gc_unprotect_object((*it)->function);
      scm_gc_unprotect_object (r);
      (*it)->function = function;
      (*it)->priority = pri;
      (*it)->fallthru = fall;
      hooksMap[hooktype].sort (hptr_lt);
      return true;
    }
  // It does not exist, we create it
  hooksMap[hooktype].push_back (new Hook(hooktype, rx, r, 
					 function, pri, fall, name));
  hooksMap[hooktype].sort (hptr_lt);
  return true;
}

bool
BotInterp::RunHooks(int hooktype, String match, SCM args)
{
  SCM result;
  // We want to execute higher priority hooks first, so we start at
  // the end of the list instead of the beggining
  std::list<Hook *>::reverse_iterator it = hooksMap[hooktype].rbegin();
  std::list<Hook *>::reverse_iterator it2 = hooksMap[hooktype].rend();
  wrapper_data wd;
  wd.args = args;
  for ( ; it != it2; ++it) {
    if (scm_regexp_exec((*it)->regex, Utils::str2scm (match),
                        SCM_UNDEFINED, SCM_UNDEFINED) != SCM_BOOL_F)
      {
	wd.func = (*it)->function;
	result = scm_internal_catch(SCM_BOOL_T, 
				    (scm_t_catch_body) lazy_apply_wrapper,
				    static_cast<void *> (&wd), 
				    (scm_t_catch_handler) empty_handler, 0);
	if (! (*it)->fallthru)
	  break;
    }
  }
  return true;
}

SCM
BotInterp::AddTimer(int delay, SCM function)
{
  int when = time(NULL) + delay;
  int c = ++counter;
  scm_gc_protect_object(function);
  Timer *t = new Timer(c, when, function);
  timersList.push_back(t);
  return scm_long2num (c);
}

bool
BotInterp::DelTimer(SCM timer)
{
  int count = scm_num2long(timer, SCM_ARG1, "BotInterp::DelTimer");
  std::list<Timer *>::iterator it = timersList.begin();
  std::list<Timer *>::iterator it2 = timersList.end();

  for ( ; it != it2; ++it) {
    if ((*it)->count == count) {
      scm_gc_unprotect_object((*it)->function);
      delete (*it);
      timersList.erase(it);
      return true;
    }
  }
  return false;
}

bool
BotInterp::RunTimers(int now)
{
  std::list<Timer *>::iterator it = timersList.begin();
  std::list<Timer *>::iterator it2 = timersList.end();
  std::list<Timer *>::iterator it3;

  struct wrapper_data wd;
  wd.args = scm_listify (SCM_UNDEFINED);

  while (it != it2) {
    if ((*it)->when <= now) {
      wd.func = (*it)->function;
      scm_internal_catch(SCM_BOOL_T,
		     (scm_t_catch_body) lazy_apply_wrapper, (void *)&wd,
		     (scm_t_catch_handler) empty_handler, 0);
      scm_gc_unprotect_object(wd.func);
      it3 = it;
      ++it3;
      delete (*it);
      timersList.erase(it);
      it = it3;
    } else {
      ++it;
    }
  }
  return true;
}

#endif