#include "grtui/gui_plugin_base.h"
#include <gtkmm.h>
#include "wb_printing.h"
#include "mdc_canvas_view_printing.h"
#include "wbcanvas/model_diagram_impl.h"
#include "grts/structs.workbench.h"
#include "gtk_helpers.h"
#include <stdio.h>
#include <gtk/gtk.h>
#include "base/string_utilities.h"

using base::strfmt;

namespace linux_printing
{
  
  static void update_gtk_page_setup_from_grt(Glib::RefPtr<Gtk::PageSetup> &setup,
                                             const app_PageSettingsRef &settings,
                                             bool skip_margins)
  {
    app_PaperTypeRef current_type = settings->paperType();
    Gtk::PaperSize paper_size(current_type->name().c_str()
                             , current_type->caption().c_str()
                             , current_type->width()
                             , current_type->height()
                             , Gtk::UNIT_MM
                              );
    setup->set_bottom_margin((skip_margins?0:1)*settings->marginBottom(), Gtk::UNIT_MM);
    setup->set_left_margin((skip_margins?0:1)*settings->marginLeft(), Gtk::UNIT_MM);
    setup->set_right_margin((skip_margins?0:1)*settings->marginRight(), Gtk::UNIT_MM);
    setup->set_top_margin((skip_margins?0:1)*settings->marginTop(), Gtk::UNIT_MM);
    
    if (settings->paperType().is_valid())
      setup->set_paper_size(paper_size);

    if (*settings->orientation() == "landscape")
      setup->set_orientation(Gtk::PAGE_ORIENTATION_LANDSCAPE);
    else
      setup->set_orientation(Gtk::PAGE_ORIENTATION_PORTRAIT);
  }

//==============================================================================
class WBPageSetup
{
public:
  WBPageSetup(const app_PageSettingsRef& ps);

  void propagate_print_settings_to_grt_tree();
  virtual void run_setup();

  Glib::RefPtr<Gtk::PageSetup>      _page_setup;
  Glib::RefPtr<Gtk::PrintSettings>  _print_settings;

private:
  static app_PageSettingsRef                      _app_page_settings;
};

app_PageSettingsRef               WBPageSetup::_app_page_settings;

//------------------------------------------------------------------------------
WBPageSetup::WBPageSetup(const app_PageSettingsRef& ps)
{
  _app_page_settings = ps;
  if (!_page_setup)
    _page_setup     = Gtk::PageSetup::create();

  if (!_print_settings)
    _print_settings = Gtk::PrintSettings::create();
}


//------------------------------------------------------------------------------
void WBPageSetup::run_setup()
{
  if (_app_page_settings.is_valid())
  {
    update_gtk_page_setup_from_grt(_page_setup, _app_page_settings, false);
  }

  Glib::RefPtr<Gtk::PageSetup> new_page_setup = Gtk::run_page_setup_dialog(*get_mainwindow(), _page_setup, _print_settings);
  _page_setup = new_page_setup;

  propagate_print_settings_to_grt_tree();
}

//------------------------------------------------------------------------------
void WBPageSetup::propagate_print_settings_to_grt_tree()
{
  std::string page_orientation_as_str;
  
  // Set orientation
  Gtk::PageOrientation page_orient = _page_setup->get_orientation();
  if ( page_orient == Gtk::PAGE_ORIENTATION_PORTRAIT )
    page_orientation_as_str = "portrait";
  else if ( page_orient == Gtk::PAGE_ORIENTATION_LANDSCAPE )
    page_orientation_as_str = "landscape";
  else
  {
    g_message("Unsupported page orientation. Setting page orientation to portrait");
    page_orientation_as_str = "portrait";
  }  
  _app_page_settings->orientation(page_orientation_as_str);
  
  // Set paper type
  Gtk::PaperSize   gtk_paper_size      = _page_setup->get_paper_size();
  app_PaperTypeRef paper_type          = _app_page_settings->paperType();

  const std::string paper_name = gtk_paper_size_get_name(gtk_paper_size.gobj());

  grt::ListRef<app_PaperType> paper_types(grt::ListRef<app_PaperType>::cast_from(_app_page_settings.get_grt()->get("/wb/options/paperTypes")));
  
  app_PaperTypeRef ptype(app_PaperTypeRef::cast_from(grt::find_named_object_in_list(paper_types, paper_name)));

  _app_page_settings->marginBottom(gtk_paper_size.get_default_bottom_margin(Gtk::UNIT_MM));
  _app_page_settings->marginLeft(gtk_paper_size.get_default_left_margin(Gtk::UNIT_MM));
  _app_page_settings->marginRight(gtk_paper_size.get_default_right_margin(Gtk::UNIT_MM));
  _app_page_settings->marginTop(gtk_paper_size.get_default_top_margin(Gtk::UNIT_MM));

  if (ptype.is_valid())
    _app_page_settings->paperType(ptype);
  else
    g_warning("Unknown paper size selected in GTK Page Setup dialog: %s", paper_name.c_str());
}

//==============================================================================
class WBPrintOperation : public Gtk::PrintOperation
{
public:
  WBPrintOperation(const model_DiagramRef& diagram);
  static Glib::RefPtr<WBPrintOperation> create(const model_DiagramRef& diagram);
  virtual ~WBPrintOperation();
    
protected:
  virtual void on_begin_print(const Glib::RefPtr<Gtk::PrintContext>& ctx);    
  virtual void on_draw_page(const Glib::RefPtr<Gtk::PrintContext>& ctx, int page_nr);    
  virtual void on_done(Gtk::PrintOperationResult result);
  
private:
  model_DiagramRef                  _diagram;
  mdc::CanvasViewExtras             *_printer;
  int _xpages;
  int _ypages;

  Glib::RefPtr<Gtk::PageSetup>      _page_setup;
  Glib::RefPtr<Gtk::PrintSettings>  _print_settings;
};

//------------------------------------------------------------------------------
WBPrintOperation::WBPrintOperation(const model_DiagramRef& diagram)
    : _diagram(diagram)
    , _printer(0)
    , _xpages(0)
    , _ypages(0)
{
  _page_setup     = Gtk::PageSetup::create();
  _print_settings = Gtk::PrintSettings::create();
}

//------------------------------------------------------------------------------
Glib::RefPtr<WBPrintOperation> WBPrintOperation::create(const model_DiagramRef& diagram)
{
  return Glib::RefPtr<WBPrintOperation>(new WBPrintOperation(diagram));
}

//------------------------------------------------------------------------------
WBPrintOperation::~WBPrintOperation()
{
  delete _printer;
}

//------------------------------------------------------------------------------
void WBPrintOperation::on_begin_print(const Glib::RefPtr<Gtk::PrintContext>& ctx)
{
  app_PageSettingsRef pageSettings(workbench_DocumentRef::cast_from(_diagram.get_grt()->get("/wb/doc"))->pageSettings());
  app_PaperTypeRef paperType(pageSettings->paperType());

  update_gtk_page_setup_from_grt(_page_setup, pageSettings, true);

  Gtk::PaperSize gpaperSize(_page_setup->get_paper_size());

  set_default_page_setup(_page_setup);
  set_print_settings(_print_settings);
  set_track_print_status();

  // page settings in cairo coordinates
  float paperWidth= (*paperType->width() * *pageSettings->scale());
  float paperHeight= (*paperType->height() * *pageSettings->scale());
  float marginLeft= (*pageSettings->marginLeft() * *pageSettings->scale());
  float marginRight= (*pageSettings->marginRight() * *pageSettings->scale());
  float marginTop= (*pageSettings->marginTop() * *pageSettings->scale());
  float marginBottom= (*pageSettings->marginBottom() * *pageSettings->scale());

  if (pageSettings->orientation() == "landscape")
  {
    std::swap(paperWidth, paperHeight);
    std::swap(marginLeft, marginTop);
    std::swap(marginRight, marginBottom);
  }

  // size of the printable area in cairo coords
  base::Size pageSize;
  pageSize.width= paperWidth - marginLeft - marginRight;
  pageSize.height= paperHeight - marginTop - marginBottom;
  
  _printer= new mdc::CanvasViewExtras(_diagram->get_data()->get_canvas_view());
  
  // margins are already added by the system
  _printer->set_page_margins(marginTop, marginLeft, marginBottom, marginRight);
  _printer->set_paper_size(paperWidth, paperHeight);
  //    _printer->set_orientation(pageSettings->orientation()=="landscape"?mdc::Landscape:mdc::Portrait);
  //
  
  _printer->set_print_border(true);

  set_n_pages(wbprint::getPageCount(_diagram));
  wbprint::getPageLayout(_diagram, _xpages, _ypages);
}

//------------------------------------------------------------------------------
void WBPrintOperation::on_draw_page(const Glib::RefPtr<Gtk::PrintContext>& ctx, int page_nr)
{
  Cairo::RefPtr<Cairo::Context> context = ctx->get_cairo_context();
  mdc::CairoCtx cairoctx(context->cobj());

  // scaling to transform from cairo coordinates to Cocoa coordinates
  double pwidth, pheight;
  _printer->get_paper_size(pwidth, pheight);
  float xscale= ctx->get_width() / pwidth;
  float yscale= ctx->get_height() / pheight;

  // scale has to be set here, ctx->get_width() returns some different value in on_begin_print()
  _printer->set_scale(xscale, yscale);

  _printer->render_page(&cairoctx, page_nr % _xpages, page_nr / _xpages);
 
}

//------------------------------------------------------------------------------
void WBPrintOperation::on_done(Gtk::PrintOperationResult result)
{
  delete _printer;
  _printer= 0;
  PrintOperation::on_done(result);
}

//==============================================================================
class WBPrintingLinux : public GUIPluginBase
{
  public:
    WBPrintingLinux(grt::Module *m, bec::GRTManager *grtm, const grt::BaseListRef &args);
    virtual void execute();
    virtual void show_plugin();
    
  private:
    void on_print_done(Gtk::PrintOperationResult result, Glib::RefPtr<WBPrintOperation> &op);
    model_DiagramRef    _diagram; //!< TODO: use currently selected diagram!
};

//------------------------------------------------------------------------------
WBPrintingLinux::WBPrintingLinux(grt::Module *m, bec::GRTManager *grtm, const grt::BaseListRef &args)
                : GUIPluginBase(m)
                , _diagram(model_DiagramRef::cast_from(args.get(0)))
{}

//------------------------------------------------------------------------------
void WBPrintingLinux::execute()
{}

//------------------------------------------------------------------------------
void WBPrintingLinux::show_plugin()
{
  try
  {
    Glib::RefPtr<WBPrintOperation> printer = WBPrintOperation::create(_diagram);

    printer->signal_done().connect(sigc::bind(sigc::mem_fun(this, &WBPrintingLinux::on_print_done), printer));
    /*Gtk::PrintOperationResult result = */printer->run(Gtk::PRINT_OPERATION_ACTION_PRINT_DIALOG, *(get_mainwindow()));
  }
  catch (const Gtk::PrintError &e)
  {
    g_message("Error while printing %s", e.what().c_str());
  }
}

//------------------------------------------------------------------------------
void WBPrintingLinux::on_print_done(Gtk::PrintOperationResult result, Glib::RefPtr<WBPrintOperation> &op)
{
  if (result == Gtk::PRINT_OPERATION_RESULT_ERROR)
  {
    Gtk::MessageDialog err_dlg(*get_mainwindow(), "Error printing document", false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
    err_dlg.run();
  }
  else if (result == Gtk::PRINT_OPERATION_RESULT_APPLY)
  {
    //_print_settings = op->get_print_settings();
  }
}

}// end of namespace linux_printing

//------------------------------------------------------------------------------
extern "C" 
{
  GUIPluginBase *createPrintDialog(grt::Module *m, bec::GRTManager *grtm, const grt::BaseListRef &args)
  {
    //return new linux_printing::WBPrintingLinux(m, grtm, args);
    linux_printing::WBPrintingLinux lp(m, grtm, args);
    lp.show_plugin();
    return 0;
  }
};

//------------------------------------------------------------------------------
extern "C" 
{
  GUIPluginBase *createPrintPreviewDialog(grt::Module *m, bec::GRTManager *grtm, const grt::BaseListRef &args)
  {
    g_message("print preview");
//    linux_printing::WBPrintingLinux lp(m, grtm, args);
//    lp.show_plugin();
    return 0;
  }
};

//------------------------------------------------------------------------------
extern "C" 
{
  GUIPluginBase *createPrintSetupDialog(grt::Module *m, bec::GRTManager *grtm, const grt::BaseListRef &args)
  { 
    workbench_DocumentRef doc(workbench_DocumentRef::cast_from(grtm->get_grt()->get("/wb/doc")));
    if (doc.is_valid())
    {
      linux_printing::WBPageSetup ps(doc->pageSettings());

      ps.run_setup();
    }
    return 0;
  }
};