// src/simulation_widget.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 "simulation_widget.hh"

#include "cairo_elements.hh"
#include "backend/history.hh"
#include "backend/simulation.hh"
#include "backend/string_utils.hh"

#include <cassert>

#ifndef NDEBUG
#include <iostream>
#endif

using namespace sgpem;


SimulationWidget::SimulationWidget()
    : Glib::ObjectBase("sgpem_SimulationWidget"), CairoWidget(),
    _n_update(0)
{
  // Register this observer:
  Simulation::get_instance().get_history().attach(*this);
}


SimulationWidget::~SimulationWidget()
{
  Simulation::get_instance().get_history().detach(*this);
}

void
SimulationWidget::update(const History& history)
{
  _n_update++;
  std::cout << " update: " << _n_update << std::endl;

  // Force redraw
  redraw();
}


void
SimulationWidget::draw_widget(cairo_t* ctx)
{
  cairo_set_source_rgb(ctx, 0, 0, 0);
  cairo_move_to(ctx, 0, 0);
  cairo_line_to(ctx, 300, 350);
  cairo_stroke(ctx);
  
  cairo_set_source_rgb(ctx, 0, 0, 0);
  cairo_move_to(ctx, 0, 0);
  cairo_line_to(ctx, 300, 350);
  // NOTE: just to try
  CairoElements ce(ctx);

  Rectangle area = { 30, 30, 100, 100 };
  ce.draw_container(area);

  Color red = { 1, 0, 0 };
  Point center = { 25, 25 };
  ce.draw_3dsphere(center, 20, red);

  Glib::ustring msg("Number of updates: "), number;
  int_to_string(_n_update, number);
  msg = msg + number;
  cairo_move_to(ctx, 10, 105);
  cairo_show_text(ctx,msg.c_str());
  
  switch(get_scaling_mode())
  {
    case CairoWidget::scaling_none:
      msg = "scaling_none = without any scaling";
      break;
    case CairoWidget::scaling_to_w:
      msg = "scaling_to_w = uses width to calculate scale factor";
      break;
    case CairoWidget::scaling_to_h:
      msg = "scaling_to_h = uses height to calculate scale factor";
      break;
    case CairoWidget::scaling_min:
      msg = "scaling_min = uses minimum scale factor from width, height";
      break;
    case CairoWidget::scaling_max:
      msg = "scaling_max = uses maximum scale factor from width, height";
      break;
    case CairoWidget::scaling_all:
      msg = "scaling_all = scale to stretch into client area";
      break;
  }
  cairo_move_to(ctx, 10, 115);
  cairo_show_text(ctx,msg.c_str());
  msg = "clic to change mode...";
  cairo_move_to(ctx, 10, 125);
  cairo_show_text(ctx,msg.c_str());

}


void
SimulationWidget::calc_drawing_size(size_t& width, size_t& height) const
{
  // FIXME: write me
  // some magic here!
  width = 150;
  height = 150;
}

bool
SimulationWidget::on_button_press_event(GdkEventButton* event)
{
  std::cout << " on_button_press_event " << std::endl;
  change_scaling_mode();
  // Not here. Yet.
  return true;
}


void
SimulationWidget::change_scaling_mode()
{

  std::cout << " change_scaling_mode " << std::endl;
  scaling_mode scaling = get_scaling_mode();
  switch(scaling)
  {
    case scaling_none:
      set_scaling_mode(scaling_to_w);
      break;
    case scaling_to_w:
    case scaling_to_h:
    case scaling_min:
    case scaling_max:
      set_scaling_mode((scaling_mode)(scaling << 1));
      break;
    case scaling_all:
      set_scaling_mode(scaling_none);
      break;
  }
  redraw();
}