// src/startgui.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 "configure_policy_dialog.hh"
#include "gui_builder.hh"
#include "graphical_preferences_editor.hh"
#include "schedulables_tree_widget.hh"
#include "simulation_widget.hh"
#include "resources_widget.hh"

#include "backend/cpu_policy_exception.hh"
#include "backend/malformed_policy_exception.hh"
#include "backend/null_policy_exception.hh"
#include "backend/user_interrupt_exception.hh"
#include "backend/cpu_policies_gatekeeper.hh"
#include "backend/cpu_policy.hh"
#include "backend/cpu_policy_manager.hh"
#include "backend/resource_policies_gatekeeper.hh"
#include "backend/resource_policy_manager.hh"
#include "backend/resource_policy.hh"
#include "backend/history.hh"
#include "backend/policy_parameters.hh"
#include "backend/simulation.hh"
#include "backend/serializers_gatekeeper.hh"
#include "backend/serializer.hh"

#include <gdkmm/pixbuf.h>
#include <glibmm/markup.h>
#include <glibmm/timer.h>
#include <glibmm/ustring.h>
#include <gtkmm/aboutdialog.h>
#include <gtkmm/messagedialog.h>
#include <gtkmm/menutoolbutton.h>
#include <gtkmm/filechooserdialog.h>
#include <gtkmm/main.h>
#include <gtkmm/menuitem.h>
#include <gtkmm/scrolledwindow.h>
#include <gtkmm/statusbar.h>
#include <gtkmm/stock.h>

#include <cassert>
#include <iostream>

using namespace sgpem;
using Gnome::Glade::Xml;


void
GuiBuilder::on_edit_preferences_activate()
{
	new PreferencesEditor(); //FIXME: are we leaking this way?
}

void
GuiBuilder::on_file_open_activate()
{
  Glib::ustring msg;
  try
  {
    std::vector<Serializer*> serializers =
      SerializersGatekeeper::get_instance().get_registered();

    // FIXME using the first serializer available, this
    // will need to be changed when multiple serializers will
    // be made available
    Serializer& serializer = *serializers.at(0);
    History& history = Simulation::get_instance().get_history();

    // open file dialog...
    Gtk::FileChooserDialog dialog("Please choose a file", Gtk::FILE_CHOOSER_ACTION_OPEN);
    dialog.set_transient_for(get_initial_window());

    //Add response buttons the the dialog:
    dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
    dialog.add_button(Gtk::Stock::OPEN, Gtk::RESPONSE_OK);

    //Add filters, so that only certain file types can be selected:
    for(std::vector<Serializer*>::const_iterator iter=serializers.begin(); iter!=serializers.end(); iter++)
    {
      Serializer* ser = *iter;
      Gtk::FileFilter filter_sgpem;
      filter_sgpem.set_name(ser->get_filename_description());
      filter_sgpem.add_pattern(ser->get_filename_extension());
      dialog.add_filter(filter_sgpem);
    }

    Gtk::FileFilter filter_any;
    filter_any.set_name("Any files");
    filter_any.add_pattern("*");
    dialog.add_filter(filter_any);

    //Show the dialog and wait for a user response:
    int result = dialog.run();
    if(result==Gtk::RESPONSE_OK)
    {
      Glib::ustring filename = dialog.get_filename();
      serializer.restore_snapshot(filename, history);
      msg = "File: " + filename + " loaded.";
    } // end - if(result==Gtk::RESPONSE_OK)

  }
  catch (std::out_of_range e)
  {
    msg = _("ERROR: No registered serializer available");
  }
  catch (SerializerError e)
  {
    msg = _("ERROR: ") + Glib::ustring(e.what());
  }
  if(!msg.empty())
  {
    Gtk::Statusbar* sbar = _refXml->get_widget("MainStatusBar", sbar);
    sbar->push(msg);
  }
}

void
GuiBuilder::on_file_save_activate()
{
  // _simulation_widget->change_scaling_mode();
}

void
GuiBuilder::on_file_saveas_activate()
{
  Glib::ustring msg;
  try
  {
    std::vector<Serializer*> serializers =
      SerializersGatekeeper::get_instance().get_registered();

    // FIXME using the first serializer available, this
    // will need to be changed when multiple serializers will
    // be made available
    Serializer& serializer = *serializers.at(0);
    History& history = Simulation::get_instance().get_history();

    // open file dialog...
    Gtk::FileChooserDialog dialog("Please choose a file", Gtk::FILE_CHOOSER_ACTION_SAVE);
    dialog.set_transient_for(get_initial_window());

    //Add response buttons the the dialog:
    dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
    dialog.add_button(Gtk::Stock::SAVE, Gtk::RESPONSE_OK);

    //Add filters, so that only certain file types can be selected:
    Gtk::FileFilter filter_sgpem;
    filter_sgpem.set_name("Sgpem files");
    filter_sgpem.add_pattern("*.xgp");
    dialog.add_filter(filter_sgpem);
  
    Gtk::FileFilter filter_any;
    filter_any.set_name("Any files");
    filter_any.add_pattern("*");
    dialog.add_filter(filter_any);
  
    //Show the dialog and wait for a user response:
    int result = dialog.run();
    if(result==Gtk::RESPONSE_OK)
    {
      serializer.save_snapshot(dialog.get_filename(), history);
      msg = "File: " + dialog.get_filename() + " saved.";
    } // end - if(result==Gtk::RESPONSE_OK)

  }
  catch (std::out_of_range e)
  {
    msg = _("ERROR: No registered serializer available");
  }
  catch (SerializerError e)
  {
    msg = _("ERROR: ") + Glib::ustring(e.what());
  }
  
  if(!msg.empty())
  {
    Gtk::Statusbar* sbar = _refXml->get_widget("MainStatusBar", sbar);
    sbar->push(msg);
  }
}


void
GuiBuilder::on_configure_cpu_policy()
{
  using namespace Gtk;

  CPUPolicy* policy = Simulation::get_instance().get_policy();

  if(policy == NULL)
    {
      MessageDialog warn(_("<b>No CPU policy is currently selected.</b>\nPlease choose one before trying to configure it."),
                         true, MESSAGE_WARNING, BUTTONS_OK, true);
      warn.run();
      return;
    }

  PolicyParameters& params = policy->get_parameters();
  ConfigurePolicyDialog config_dialog(_("Configuring CPU Policy ") + policy->get_name(), params);
  config_dialog.run();
}


void
GuiBuilder::on_configure_resource_policy()
{
  using namespace Gtk;

  ResourcePolicy* policy = Simulation::get_instance().get_resource_policy();

  if(policy == NULL)
    {
      MessageDialog warn(_("<b>No CPU policy is currently selected.</b>\nPlease choose one before trying to configure it."),
                         true, MESSAGE_WARNING, BUTTONS_OK, true);
      warn.run();
      return;
    }

  PolicyParameters& params = policy->get_parameters();
  ConfigurePolicyDialog config_dialog(_("Configuring CPU Policy ") + policy->get_name(), params);
  config_dialog.run();
}



GuiBuilder::GuiBuilder(const std::string& gladefile)
  : _refXml(Xml::create(gladefile)), _controller(Simulation::get_instance(), _refXml)
{
  using namespace Gtk;

  //Window& main_window = get_initial_window();

  // file open dialog
  MenuItem* file_open = NULL;
  _refXml->get_widget("MenuItem.File.Open", file_open);
  file_open->signal_activate().connect(sigc::mem_fun(*this, &GuiBuilder::on_file_open_activate));

  // file save dialog
  MenuItem* file_save = NULL;
  _refXml->get_widget("MenuItem.File.Save", file_save);
  file_save->signal_activate().connect(sigc::mem_fun(*this, &GuiBuilder::on_file_save_activate));

  // file save dialog
  MenuItem* file_saveas = NULL;
  _refXml->get_widget("MenuItem.File.SaveAs", file_saveas);
  file_saveas->signal_activate().connect(sigc::mem_fun(*this, &GuiBuilder::on_file_saveas_activate));


  // Connect extra signals (decide where to do this...
  // here -- ugly -- derive widgets and then use
  // Glade::Xml::get_widget_derived -- better --)
  MenuItem* file_quit = NULL;
  _refXml->get_widget("MenuItem.File.Quit", file_quit);
  file_quit->signal_activate().connect(sigc::ptr_fun(&Main::quit));

	// preferences dialog
  MenuItem* edit_preferences;
  _refXml->get_widget("MenuItem.Edit.Preferences", edit_preferences);
  edit_preferences->signal_activate().connect(sigc::mem_fun(*this, &GuiBuilder::on_edit_preferences_activate));


  // ---------------- Toolbar buttons ------------------

  // Note: the Play, Pause and Stop buttons are already managed by sgpem::SimulationController.

  // Configure CPU Policy
  MenuToolButton* cpu_policies_tb_menu;
  _refXml->get_widget("ToolBar.PolicySelector", cpu_policies_tb_menu);
  cpu_policies_tb_menu->signal_clicked().connect(sigc::mem_fun(*this, &GuiBuilder::on_configure_cpu_policy));

  // Configure Resource Policy
  MenuToolButton* res_policies_tb_menu;
  _refXml->get_widget("ToolBar.ResourceScheduling", res_policies_tb_menu);
  res_policies_tb_menu->signal_clicked().connect(sigc::mem_fun(*this, &GuiBuilder::on_configure_resource_policy));

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

  // About dialog
  MenuItem* help_about;
  _refXml->get_widget("MenuItem.Help.About", help_about);
  AboutDialog* about_dialog = NULL;
  _refXml->get_widget("AboutDialog", about_dialog);
  help_about->signal_activate().connect(sigc::mem_fun(*about_dialog, &Window::show));
  about_dialog->set_wrap_license(true);
  about_dialog->set_logo(Gdk::Pixbuf::create_from_file(GLADEDIR "/logo.png"));


  // Insert the schedulables TreeView custom widget
  ScrolledWindow* schedulables_sw = NULL;
  _refXml->get_widget("SchedulablesScrolledWindow", schedulables_sw);
  SchedulablesTreeWidget* scheds_tree = manage(new SchedulablesTreeWidget());
  schedulables_sw->add(*scheds_tree);
  // we have to remember to manually show custom added widgets:
  scheds_tree->show();


  // Resources ListView widget
  ResourcesWidget* resources_widget = NULL;
  _refXml->get_widget_derived("Resources.Tree", resources_widget);
  resources_widget->show();


  // Main simulation widget  
  ScrolledWindow* simulation_window = NULL;
  _refXml->get_widget("SimulationScrolledWindow", simulation_window);
  _simulation_widget = new SimulationWidget(Simulation::get_instance());
  SimulationWidget* simulation_widget = manage(_simulation_widget);
  simulation_window->add(*simulation_widget);
  simulation_widget->show();  


  // ** FIXME: just to try; a proper way to select a policy has to be installed
  Simulation& sim = Simulation::get_instance();
  CPUPoliciesGatekeeper& pgk = CPUPoliciesGatekeeper::get_instance();
  CPUPolicy* policy = pgk.get_registered()[0]->get_avail_policies()[1]; // RoundRobin at the moment of writing
  std::cout << "Selected policy : " << policy->get_name() << std::endl;
  sim.set_policy(policy);


 // FIXME: dedicate a function to set resource policy
 // which includes the following default one
 ResourcePolicyManager & rpm = *ResourcePoliciesGatekeeper::get_instance().get_registered().at(0);
 Simulation::get_instance().set_resource_policy(rpm.get_avail_policies().at(0));
 // end of include

}


GuiBuilder::~GuiBuilder()
{}


Gtk::Window&
GuiBuilder::get_initial_window() const
{
  Gtk::Window* main_window = NULL;
  _refXml->get_widget("MainWindow", main_window);
  return *main_window;
}


void
GuiBuilder::open_file(const std::string& filename)
{
  // FIXME: to be written.
  // Debug line (erase me when done):
  std::cout << _("Filename to open: ") << filename << std::endl;
}


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

SimulationController::SimulationController(Simulation& simulation, Glib::RefPtr<Xml> refXml)
  : _sim(simulation), _break_requested(false)
{
  using namespace Gtk;

  _sim.attach(*this);

  // Start, pause and stop simulation from the toolbar
  // TODO: can we use action groups instead of this?

  refXml->get_widget("ToolBar.Play",  _toolbt_start);
  refXml->get_widget("ToolBar.Pause", _toolbt_pause);
  refXml->get_widget("ToolBar.Stop",  _toolbt_stop);

  _toolbt_start->signal_clicked().connect(sigc::mem_fun(*this, &SimulationController::on_simulation_run));
  _toolbt_pause->signal_clicked().connect(sigc::mem_fun(*this, &SimulationController::on_simulation_pause));
  _toolbt_stop->signal_clicked().connect(sigc::mem_fun(*this, &SimulationController::on_simulation_stop));
}


SimulationController::~SimulationController()
{
  _sim.detach(*this);
}


void
SimulationController::on_simulation_run()
{
  // Sensitivities
  _toolbt_start->set_sensitive(false);
  _toolbt_pause->set_sensitive(true);
  _toolbt_stop->set_sensitive(true);

  _break_requested = false;
  // Used instead of simply calling "_sim.run()" to
  // have exception handling only in one place:
  run_simulation_adaptor();
}


void
SimulationController::on_simulation_pause()
{
  // Sensitivities
  _toolbt_start->set_sensitive(true);
  _toolbt_pause->set_sensitive(false);
  _toolbt_stop->set_sensitive(true);

  _break_requested = true;
  _sim.pause();
}


void
SimulationController::on_simulation_stop()
{
  // Sensitivities
  _toolbt_start->set_sensitive(true);
  _toolbt_pause->set_sensitive(false);
  _toolbt_stop->set_sensitive(false);

  _break_requested = true;
  _sim.stop();
}


void
SimulationController::update(const Simulation& simulation)
{
#ifndef NDEBUG
  std::cerr << "SimulationController::update(), simulation state == " << std::hex << simulation.get_state() << std::endl;
#endif

  if(_break_requested)
    return;

  switch(simulation.get_state())
    {
    case Simulation::state_stopped:
      on_simulation_stop();
      return;
    case Simulation::state_paused:
      on_simulation_pause();
      return;
    case Simulation::state_running:
      // Go on with the rest of the method...
      break;
    }

  // We should never enter here, if the code is correct:
  // a step by step simulation should always be in paused 
  // or stopped state after performing a single step
  assert(simulation.get_mode() != Simulation::mode_step_by_step);

  switch(simulation.get_mode())
    {
    case Simulation::mode_continuous:
      {
        int timeout = GlobalPreferences::get_instance().get_speed();
        Glib::signal_timeout().connect(sigc::mem_fun(*this, &SimulationController::run_simulation_adaptor), timeout);
      }
      break;
    default:
      // Never gets here.
      break;
    }
}


bool
SimulationController::run_simulation_adaptor()
{
  using Gtk::MessageDialog;
  using namespace Glib;

  if(!_break_requested)
    try 
      {
        _sim.run();
      }
    catch(const UserInterruptException& uie)
      {
        // Show the user a dialog
        MessageDialog diag(_("<b>The selected user CPU policy stopped before returning:</b>\n") + Markup::escape_text(uie.what()), 
                           true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
        diag.run();
      }
    catch(const MalformedPolicyException& mpe)
      {
        // Show user a dialog
        MessageDialog diag(_("<b>The selected user CPU policy was malformed and didn't run:</b>\n") + Markup::escape_text(mpe.what()), 
                           true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
        diag.run();
   
        try
          {
            // Deactivate the policy
            _sim.set_policy(NULL);
          }
        catch(const CPUPolicyException& cpe)
          {
            // Fatal error. We should never get here.
            std::cerr << _(" [EE] Fatal error. Impossible to deactivate the policy in ") <<  __FILE__ << ":" << __LINE__
                      << std::endl << _(" [EE] ") << cpe.what() << std::endl;
                                                                                                                      ;
            abort();
          }
      }
    catch(const NullPolicyException& npe)
      {
        MessageDialog diag(_("<b>No active policy selected:</b>\n") + Markup::escape_text(npe.what()), 
                           true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
        diag.run();
        
      }
    catch(const CPUPolicyException& cpe)
      {
       MessageDialog diag(_("<b>Unexpected error</b>:\n") + Markup::escape_text(cpe.what()), 
                           true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
        diag.run();
      }

  return false;
}