// src/graphicalterminalio.cc - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This 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.
//
// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "config.h"
#include "gettext.h"

#include "graphical_terminal_io.hh"

#include <glibmm/thread.h>
#include <gtkmm/button.h>
#include <gtkmm/main.h>
#include <gtkmm/scrolledwindow.h>
#include <gtkmm/textview.h>
#include <glibmm/ustring.h>

#include <algorithm>
#include <iostream>
#include <utility>

using namespace sgpem;
using namespace std;
using Glib::ustring;

GraphicalTerminalIO::GraphicalTerminalIO(TextSimulation* sim)
    : _sim(sim)
{
  using namespace Gtk;

  set_title(_("Textual Simulation Log"));
  set_default_size(500, 300);

  Box& mainbox = *manage(new VBox());
  add(mainbox);

  ScrolledWindow& txout_scroll = *manage(new ScrolledWindow());
  _text_output.set_editable(false);
  _text_output.modify_font(Pango::FontDescription("monospace"));
  txout_scroll.set_policy(POLICY_AUTOMATIC, POLICY_AUTOMATIC);
  txout_scroll.add(_text_output);
  mainbox.pack_start(txout_scroll);

  Box& cmdbox = *manage(new HBox());
  mainbox.pack_end(cmdbox, false, false);

  // Maybe we should connect explicitly TextBuffer.signal_changed
  // to the TextView redraw function (see Gtk::Widget for that)??

  _text_input.activate();
  _text_input.set_activates_default();
  cmdbox.pack_start(_text_input);

  Button& btsend = *manage(new Gtk::Button(_("Send Command")));
  btsend.signal_clicked().connect(sigc::mem_fun(*this, &GraphicalTerminalIO::onSend));
  GTK_WIDGET_SET_FLAGS(btsend.gobj(), CAN_DEFAULT);
  set_default(btsend);
  cmdbox.pack_start(btsend, false, true);

  _text_input.grab_focus();

  show_all_children();
}

GraphicalTerminalIO::~GraphicalTerminalIO()
{}

void
GraphicalTerminalIO::onSend()
{
  using Glib::Thread;

  pair<pair<TextSimulation*, IOManager*>, const ustring>  p(
    pair<TextSimulation*, IOManager*>(_sim, this),
    read_command());

  Thread::create(sigc::bind(&TextSimulation::parse_command, p), true);
}

uint
GraphicalTerminalIO::write_buffer(const Glib::ustring& buffer)
{
  Glib::Mutex::Lock lock(_mtx);

  Glib::RefPtr<Gtk::TextBuffer> txbuf = _text_output.get_buffer();
  txbuf->insert_at_cursor(buffer);

  // Force the UI update queue to flush
  //  while(Gtk::Main::instance()->events_pending())
  //  Gtk::Main::instance()->iteration();

  // i = _text_output.get_buffer()->end();
  return buffer.size();
}

Glib::ustring
GraphicalTerminalIO::read_command()
{
  // For next implementers: take a look to Gtk::EntryCompletion...
  // ... maybe it's worth using (when and if we'll have a separate
  // Interpreter class)

  using Glib::ustring;
  static const ustring whitespaces = " \r\b\n\t\a";
  // are there any other wspaces?

  ustring command = _text_input.get_text();

  // trimming:
  uint f = command.find_first_not_of(whitespaces);
  uint l = command.find_last_not_of(whitespaces);
  if(f == ustring::npos)
    return "";

  _text_input.set_text("");
  _text_input.grab_focus();

  return command.substr(f, l - f + 1);
}

bool
GraphicalTerminalIO::is_full_duplex()
{
  return true;
}