#include "selectiondialog.h"
#include <algorithm>

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
}

SelectionDialogBase::ListViewText::ListViewText(bool use_markup) : Gtk::TreeView(), use_markup(use_markup) {
  list_store = Gtk::ListStore::create(column_record);
  set_model(list_store);
  append_column("", cell_renderer);
  if(use_markup)
    get_column(0)->add_attribute(cell_renderer.property_markup(), column_record.text);
  else
    get_column(0)->add_attribute(cell_renderer.property_text(), column_record.text);
  
  get_selection()->set_mode(Gtk::SelectionMode::SELECTION_BROWSE);
  set_enable_search(true);
  set_headers_visible(false);
  set_hscroll_policy(Gtk::ScrollablePolicy::SCROLL_NATURAL);
  set_activate_on_single_click(true);
  set_hover_selection(false);
  set_rules_hint(true);
}

void SelectionDialogBase::ListViewText::append(const std::string& value) {
  auto new_row=list_store->append();
  new_row->set_value(column_record.text, value);
}

void SelectionDialogBase::ListViewText::clear() {
  unset_model();
  list_store.reset();
}

SelectionDialogBase::SelectionDialogBase(Gtk::TextView& text_view, Glib::RefPtr<Gtk::TextBuffer::Mark> start_mark, bool show_search_entry, bool use_markup):
    text_view(text_view), window(Gtk::WindowType::WINDOW_POPUP), list_view_text(use_markup), start_mark(start_mark), show_search_entry(show_search_entry) {
  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_COMBO);
  
  list_view_text.set_search_entry(search_entry);
  
  window.set_default_size(0, 0);
  window.property_decorated()=false;
  window.set_skip_taskbar_hint(true);
  
  scrolled_window.set_policy(Gtk::PolicyType::POLICY_AUTOMATIC, Gtk::PolicyType::POLICY_AUTOMATIC);

  scrolled_window.add(list_view_text);
  if(show_search_entry)
    vbox.pack_start(search_entry, false, false);
  vbox.pack_start(scrolled_window, true, true);
  window.add(vbox);

  list_view_text.signal_realize().connect([this](){
    resize();
  });
  
  list_view_text.signal_cursor_changed().connect([this] {
    cursor_changed();
  });
}

void SelectionDialogBase::cursor_changed() {
  if(!shown)
    return;
  auto it=list_view_text.get_selection()->get_selected();
  std::string row;
  if(it)
    it->get_value(0, row);
  if(last_row==row)
    return;
  if(on_changed)
    on_changed(row);
  last_row=row;
}

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

void SelectionDialogBase::add_row(const std::string& row) {
  list_view_text.append(row);
}

void SelectionDialogBase::show() {
  shown=true;
  
  //Move
  Gdk::Rectangle iter_rect;
  text_view.get_iter_location(start_mark->get_iter(), iter_rect);
  Gdk::Rectangle visible_rect;
  text_view.get_visible_rect(visible_rect);
  int buffer_x=std::max(iter_rect.get_x(), visible_rect.get_x());
  int buffer_y=iter_rect.get_y()+iter_rect.get_height();
  int window_x, window_y;
  text_view.buffer_to_window_coords(Gtk::TextWindowType::TEXT_WINDOW_TEXT, buffer_x, buffer_y, window_x, window_y);
  int root_x, root_y;
  text_view.get_window(Gtk::TextWindowType::TEXT_WINDOW_TEXT)->get_root_coords(window_x, window_y, root_x, root_y);
  window.move(root_x, root_y+1); //TODO: replace 1 with some margin
  
  window.show_all();
  //Need to move before and after show all. Some WM's disregards moves before show_all,
  //and Wayland does not position correctly unless move is called before show_all
  window.move(root_x, root_y+1);
  
  if(list_view_text.get_model()->children().size()>0) {
    if(!list_view_text.get_selection()->get_selected()) {
      list_view_text.set_cursor(list_view_text.get_model()->get_path(list_view_text.get_model()->children().begin()));
      cursor_changed();
    }
    else if(list_view_text.get_model()->children().begin()!=list_view_text.get_selection()->get_selected()) {
      while(g_main_context_pending(NULL))
        g_main_context_iteration(NULL, false);
      list_view_text.scroll_to_row(list_view_text.get_model()->get_path(list_view_text.get_selection()->get_selected()), 0.5);
    }
  }
}

void SelectionDialogBase::set_cursor_at_last_row() {
  auto children=list_view_text.get_model()->children();
  if(children.size()>0) {
    list_view_text.set_cursor(list_view_text.get_model()->get_path(children[children.size()-1]));
    cursor_changed();
  }
}

void SelectionDialogBase::hide() {
  if(!shown)
    return;
  shown=false;
  window.hide();
  if(on_hide)
    on_hide();
  list_view_text.clear();
}

void SelectionDialogBase::resize() {
  if(list_view_text.get_realized()) {
    int row_width=0, row_height;
    Gdk::Rectangle rect;
    list_view_text.get_cell_area(list_view_text.get_model()->get_path(list_view_text.get_model()->children().begin()), *(list_view_text.get_column(0)), rect);
    row_width=rect.get_width();
    row_height=rect.get_height();

    row_width+=rect.get_x()*2; //TODO: Add correct margin x and y
    row_height+=rect.get_y()*2;

    if(row_width>text_view.get_width()/2)
      row_width=text_view.get_width()/2;
    else
      scrolled_window.set_policy(Gtk::PolicyType::POLICY_NEVER, Gtk::PolicyType::POLICY_AUTOMATIC);

    int window_height=std::min(row_height*static_cast<int>(list_view_text.get_model()->children().size()), row_height*10);
    if(show_search_entry)
      window_height+=search_entry.get_height();
    window.resize(row_width+1, window_height);
  }
}

SelectionDialog::SelectionDialog(Gtk::TextView& text_view, Glib::RefPtr<Gtk::TextBuffer::Mark> start_mark, bool show_search_entry, bool use_markup) : SelectionDialogBase(text_view, start_mark, show_search_entry, use_markup) {
  std::shared_ptr<std::string> search_key(new std::string());
  auto filter_model=Gtk::TreeModelFilter::create(list_view_text.get_model());
  
  filter_model->set_visible_func([this, search_key](const Gtk::TreeModel::const_iterator& iter){
    std::string row_lc;
    iter->get_value(0, row_lc);
    auto search_key_lc=*search_key;
    std::transform(row_lc.begin(), row_lc.end(), row_lc.begin(), ::tolower);
    std::transform(search_key_lc.begin(), search_key_lc.end(), search_key_lc.begin(), ::tolower);
    if(list_view_text.use_markup) {
      size_t pos=0;
      while((pos=row_lc.find('<', pos))!=std::string::npos) {
        auto pos2=row_lc.find('>', pos+1);
        row_lc.erase(pos, pos2-pos+1);
      }
      search_key_lc=Glib::Markup::escape_text(search_key_lc);
    }
    if(row_lc.find(search_key_lc)!=std::string::npos)
      return true;
    return false;
  });
  
  list_view_text.set_model(filter_model);
  
  list_view_text.set_search_equal_func([this](const Glib::RefPtr<Gtk::TreeModel>& model, int column, const Glib::ustring& key, const Gtk::TreeModel::iterator& iter) {
    return false;
  });
  
  search_entry.signal_changed().connect([this, search_key, filter_model](){
    *search_key=search_entry.get_text();
    filter_model->refilter();
    list_view_text.set_search_entry(search_entry); //TODO:Report the need of this to GTK's git (bug)
    if(search_key->empty()) {
      if(list_view_text.get_model()->children().size()>0)
        list_view_text.set_cursor(list_view_text.get_model()->get_path(list_view_text.get_model()->children().begin()));
    }
  });
  
  auto activate=[this](){
    auto it=list_view_text.get_selection()->get_selected();
    if(on_select && it) {
      std::string row;
      it->get_value(0, row);
      hide();
      on_select(row, true);
    }
    else
      hide();
  };
  search_entry.signal_activate().connect([this, activate](){
    activate();
  });
  list_view_text.signal_row_activated().connect([this, activate](const Gtk::TreeModel::Path& path, Gtk::TreeViewColumn*) {
    activate();
  });
}

bool SelectionDialog::on_key_press(GdkEventKey* key) {
  if(key->keyval==GDK_KEY_Down && list_view_text.get_model()->children().size()>0) {
    auto it=list_view_text.get_selection()->get_selected();
    if(it) {
      it++;
      if(it)
        list_view_text.set_cursor(list_view_text.get_model()->get_path(it));
    }
    return true;
  }
  else if(key->keyval==GDK_KEY_Up && list_view_text.get_model()->children().size()>0) {
    auto it=list_view_text.get_selection()->get_selected();
    if(it) {
      it--;
      if(it)
        list_view_text.set_cursor(list_view_text.get_model()->get_path(it));
    }
    return true;
  }
  else if(key->keyval==GDK_KEY_Return || key->keyval==GDK_KEY_ISO_Left_Tab || key->keyval==GDK_KEY_Tab) {
    auto it=list_view_text.get_selection()->get_selected();
    auto column=list_view_text.get_column(0);
    list_view_text.row_activated(list_view_text.get_model()->get_path(it), *column);
    return true;
  }
  else if(key->keyval==GDK_KEY_Escape) {
    hide();
    return true;
  }
  else if(key->keyval==GDK_KEY_Left || key->keyval==GDK_KEY_Right) {
    hide();
    return false;
  }
  else if(show_search_entry) {
#ifdef __APPLE__ //OS X bug most likely: Gtk::Entry will not work if window is of type POPUP
    if(key->is_modifier)
      return true;
    else if(key->keyval==GDK_KEY_BackSpace) {
      auto length=search_entry.get_text_length();
      if(length>0)
        search_entry.delete_text(length-1, length);
      return true;
    }
    else {
      gunichar unicode=gdk_keyval_to_unicode(key->keyval);
      if(unicode>=32 && unicode!=126) {
        int length=search_entry.get_text_length();
        auto ustr=Glib::ustring(1, unicode);
        search_entry.insert_text(ustr, ustr.bytes(), length);
        return true;
      }
    }
#else
    search_entry.on_key_press_event(key);
    return true;
#endif
  }
  hide();
  return false;
}

CompletionDialog::CompletionDialog(Gtk::TextView& text_view, Glib::RefPtr<Gtk::TextBuffer::Mark> start_mark) : SelectionDialogBase(text_view, start_mark, false, false) {
  show_offset=text_view.get_buffer()->get_insert()->get_iter().get_offset();
  
  std::shared_ptr<std::string> search_key(new std::string());
  auto filter_model=Gtk::TreeModelFilter::create(list_view_text.get_model());  
  if(show_offset==start_mark->get_iter().get_offset()) {
    filter_model->set_visible_func([this, search_key](const Gtk::TreeModel::const_iterator& iter){
      std::string row_lc;
      iter->get_value(0, row_lc);
      auto search_key_lc=*search_key;
      std::transform(row_lc.begin(), row_lc.end(), row_lc.begin(), ::tolower);
      std::transform(search_key_lc.begin(), search_key_lc.end(), search_key_lc.begin(), ::tolower);
      if(row_lc.find(search_key_lc)!=std::string::npos)
        return true;
      return false;
    });
  }
  else {
    filter_model->set_visible_func([this, search_key](const Gtk::TreeModel::const_iterator& iter){
      std::string row;
      iter->get_value(0, row);
      if(row.find(*search_key)==0)
        return true;
      return false;
    });
  }
  list_view_text.set_model(filter_model);
  search_entry.signal_changed().connect([this, search_key, filter_model](){
    *search_key=search_entry.get_text();
    filter_model->refilter();
    list_view_text.set_search_entry(search_entry); //TODO:Report the need of this to GTK's git (bug)
  });
  
  list_view_text.signal_row_activated().connect([this](const Gtk::TreeModel::Path& path, Gtk::TreeViewColumn*) {
    select();
  });
  
  auto text=text_view.get_buffer()->get_text(start_mark->get_iter(), text_view.get_buffer()->get_insert()->get_iter());
  if(text.size()>0) {
    search_entry.set_text(text);
    list_view_text.set_search_entry(search_entry);
  }
}

void CompletionDialog::select(bool hide_window) {
  row_in_entry=true;
  
  auto it=list_view_text.get_selection()->get_selected();
  if(on_select && it) {
    std::string row;
    it->get_value(0, row);
    on_select(row, hide_window);
  }
  if(hide_window)
    hide();
}

bool CompletionDialog::on_key_release(GdkEventKey* key) {
  if(key->keyval==GDK_KEY_Down || key->keyval==GDK_KEY_Up)
    return false;
    
  if(show_offset>text_view.get_buffer()->get_insert()->get_iter().get_offset()) {
    hide();
  }
  else {
    auto text=text_view.get_buffer()->get_text(start_mark->get_iter(), text_view.get_buffer()->get_insert()->get_iter());
    search_entry.set_text(text);
    list_view_text.set_search_entry(search_entry);
    if(text=="") {
      if(list_view_text.get_model()->children().size()>0)
        list_view_text.set_cursor(list_view_text.get_model()->get_path(list_view_text.get_model()->children().begin()));
    }
    cursor_changed();
  }
  return false;
}

bool CompletionDialog::on_key_press(GdkEventKey* key) {
  if((key->keyval>=GDK_KEY_0 && key->keyval<=GDK_KEY_9) || 
     (key->keyval>=GDK_KEY_A && key->keyval<=GDK_KEY_Z) ||
     (key->keyval>=GDK_KEY_a && key->keyval<=GDK_KEY_z) ||
     key->keyval==GDK_KEY_underscore || key->keyval==GDK_KEY_BackSpace) {
    if(row_in_entry) {
      text_view.get_buffer()->erase(start_mark->get_iter(), text_view.get_buffer()->get_insert()->get_iter());
      row_in_entry=false;
      if(key->keyval==GDK_KEY_BackSpace)
        return true;
    }
    return false;
  }
  if(key->keyval==GDK_KEY_Shift_L || key->keyval==GDK_KEY_Shift_R || key->keyval==GDK_KEY_Alt_L || key->keyval==GDK_KEY_Alt_R || key->keyval==GDK_KEY_Control_L || key->keyval==GDK_KEY_Control_R || key->keyval==GDK_KEY_Meta_L || key->keyval==GDK_KEY_Meta_R)
    return false;
  if(key->keyval==GDK_KEY_Down && list_view_text.get_model()->children().size()>0) {
    auto it=list_view_text.get_selection()->get_selected();
    if(it) {
      it++;
      if(it) {
        list_view_text.set_cursor(list_view_text.get_model()->get_path(it));
        cursor_changed();
      }
    }
    else
      list_view_text.set_cursor(list_view_text.get_model()->get_path(list_view_text.get_model()->children().begin()));
    select(false);
    return true;
  }
  if(key->keyval==GDK_KEY_Up && list_view_text.get_model()->children().size()>0) {
    auto it=list_view_text.get_selection()->get_selected();
    if(it) {
      it--;
      if(it) {
        list_view_text.set_cursor(list_view_text.get_model()->get_path(it));
        cursor_changed();
      }
    }
    else {
      auto last_it=list_view_text.get_model()->children().end();
      last_it--;
      if(last_it)
        list_view_text.set_cursor(list_view_text.get_model()->get_path(last_it));
    }
    select(false);
    return true;
  }
  if(key->keyval==GDK_KEY_Return || key->keyval==GDK_KEY_ISO_Left_Tab || key->keyval==GDK_KEY_Tab) {
    select();
    return true;
  }
  hide();
  if(key->keyval==GDK_KEY_Escape)
    return true;
  return false;
}