#include "tooltips.h"

namespace sigc {
#ifndef SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE
  template <typename Functor>
  struct functor_trait<Functor, false> {
    typedef decltype (::sigc::mem_fun(std::declval<Functor&>(),
                                      &Functor::operator())) _intermediate;
    typedef typename _intermediate::result_type result_type;
    typedef Functor functor_type;
  };
#else
  SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE
#endif
}

Gdk::Rectangle Tooltips::drawn_tooltips_rectangle=Gdk::Rectangle();

Tooltip::Tooltip(std::function<Glib::RefPtr<Gtk::TextBuffer>()> create_tooltip_buffer, Gtk::TextView& text_view, 
Glib::RefPtr<Gtk::TextBuffer::Mark> start_mark, Glib::RefPtr<Gtk::TextBuffer::Mark> end_mark):
create_tooltip_buffer(create_tooltip_buffer), text_view(text_view), 
start_mark(start_mark), end_mark(end_mark) {}

Tooltip::~Tooltip() {
  text_view.get_buffer()->delete_mark(start_mark);
  text_view.get_buffer()->delete_mark(end_mark);
}

void Tooltip::update() {
  auto iter=start_mark->get_iter();
  auto end_iter=end_mark->get_iter();
  text_view.get_iter_location(iter, activation_rectangle);
  if(iter.get_offset()<end_iter.get_offset()) {
    while(iter.forward_char() && iter!=end_iter) {
      Gdk::Rectangle rectangle;
      text_view.get_iter_location(iter, rectangle);
      activation_rectangle.join(rectangle);
    }
  }
  int location_window_x, location_window_y;
  text_view.buffer_to_window_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, activation_rectangle.get_x(), activation_rectangle.get_y(), location_window_x, location_window_y);
  activation_rectangle.set_x(location_window_x);
  activation_rectangle.set_y(location_window_y);
}

void Tooltip::show(bool disregard_drawn) {
  if(!window) {
    //init window
    window=std::unique_ptr<Gtk::Window>(new Gtk::Window(Gtk::WindowType::WINDOW_POPUP));
    
    auto g_application=g_application_get_default();
    auto gio_application=Glib::wrap(g_application, true);
    auto application=Glib::RefPtr<Gtk::Application>::cast_static(gio_application);
    window->set_transient_for(*application->get_active_window());
    
    window->set_type_hint(Gdk::WindowTypeHint::WINDOW_TYPE_HINT_TOOLTIP);
    
    window->set_events(Gdk::POINTER_MOTION_MASK);
    window->property_decorated()=false;
    window->set_accept_focus(false);
    window->set_skip_taskbar_hint(true);
    window->set_default_size(0, 0);

    tooltip_widget=std::unique_ptr<Gtk::TextView>(new Gtk::TextView(create_tooltip_buffer()));
    wrap_lines(tooltip_widget->get_buffer());
    tooltip_widget->set_editable(false);
    auto tag=text_view.get_buffer()->get_tag_table()->lookup("def:note_background");
    tooltip_widget->override_background_color(tag->property_background_rgba());
    window->add(*tooltip_widget);

    auto layout=Pango::Layout::create(tooltip_widget->get_pango_context());
    layout->set_text(tooltip_widget->get_buffer()->get_text());
    layout->get_pixel_size(size.first, size.second);
    size.second+=2;
    
    window->signal_realize().connect([this] {
      window->move(position.first, position.second);
    });
  }
  
  //Adjust if tooltip is left of text_view
  Gdk::Rectangle visible_rect;
  text_view.get_visible_rect(visible_rect);
  int visible_x, visible_y;
  text_view.buffer_to_window_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, visible_rect.get_x(), visible_rect.get_y(), visible_x, visible_y);
  auto activation_rectangle_x=std::max(activation_rectangle.get_x(), visible_x);
  
  int root_x, root_y;
  text_view.get_window(Gtk::TextWindowType::TEXT_WINDOW_TEXT)->get_root_coords(activation_rectangle_x, activation_rectangle.get_y(), root_x, root_y);
  Gdk::Rectangle rectangle;
  rectangle.set_x(root_x);
  rectangle.set_y(std::max(0, root_y-size.second));
  rectangle.set_width(size.first);
  rectangle.set_height(size.second);
  
  if(!disregard_drawn) {
    if(Tooltips::drawn_tooltips_rectangle.get_width()!=0) {
      if(rectangle.intersects(Tooltips::drawn_tooltips_rectangle)) {
        int new_y=Tooltips::drawn_tooltips_rectangle.get_y()-size.second;
        if(new_y>=0)
          rectangle.set_y(new_y);
        else
          rectangle.set_x(Tooltips::drawn_tooltips_rectangle.get_x()+Tooltips::drawn_tooltips_rectangle.get_width()+2);
      }
      Tooltips::drawn_tooltips_rectangle.join(rectangle);
    }
    else
      Tooltips::drawn_tooltips_rectangle=rectangle;
  }

  position={rectangle.get_x(), rectangle.get_y()};
  window->show_all();
}

void Tooltip::hide() {
  if(window)
    window->hide();
}

void Tooltip::wrap_lines(Glib::RefPtr<Gtk::TextBuffer> text_buffer) {
  auto iter=text_buffer->begin();
  
  while(iter) {
    auto last_space=text_buffer->end();
    bool end=false;
    for(unsigned c=0;c<=80;c++) {
      if(!iter) {
        end=true;
        break;
      }
      if(*iter==' ')
        last_space=iter;
      if(*iter=='\n') {
        end=true;
        iter.forward_char();
        break;
      }
      iter.forward_char();
    }
    if(!end) {
      while(!last_space && iter) { //If no space (word longer than 80)
        iter.forward_char();
        if(iter && *iter==' ')
          last_space=iter;
      }
      if(iter && last_space) {
        auto mark=text_buffer->create_mark(last_space);
        auto last_space_p=last_space;
        last_space.forward_char();
        text_buffer->erase(last_space_p, last_space);
        text_buffer->insert(mark->get_iter(), "\n");
        
        iter=mark->get_iter();
        iter.forward_char();

        text_buffer->delete_mark(mark);
      }
    }
  }
}

void Tooltips::show(const Gdk::Rectangle& rectangle, bool disregard_drawn) {
  for(auto &tooltip : tooltip_list) {
    tooltip.update();
    if(rectangle.intersects(tooltip.activation_rectangle)) {
      tooltip.show(disregard_drawn);
      shown=true;
    }
    else
      tooltip.hide();
  }
}

void Tooltips::show(bool disregard_drawn) {
  for(auto &tooltip : tooltip_list) {
    tooltip.update();
    tooltip.show(disregard_drawn);
    shown=true;
  }
}

void Tooltips::hide() {
  for(auto &tooltip : tooltip_list)
    tooltip.hide();
  shown=false;
}