// subtitleeditor -- a tool to create or edit subtitle
//
// https://kitone.github.io/subtitleeditor/
// https://github.com/kitone/subtitleeditor/
//
// Copyright @ 2005-2018, kitone
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.

#include <debug.h>
#include <extension/action.h>
#include <i18n.h>

class InsertSubtitlePlugin : public Action {
 public:
  InsertSubtitlePlugin() {
    activate();
    update_ui();
  }

  ~InsertSubtitlePlugin() {
    deactivate();
  }

  void activate() {
    se_dbg(SE_DBG_PLUGINS);

    // actions
    action_group = Gtk::ActionGroup::create("InsertSubtitlePlugin");

    action_group->add(
        Gtk::Action::create(
            "insert-subtitle-before", Gtk::Stock::GO_UP, _("Insert _Before"),
            _("Insert blank subtitle before the selected subtitle")),
        Gtk::AccelKey("<Control>Insert"),
        sigc::mem_fun(*this, &InsertSubtitlePlugin::on_insert_subtitle_before));

    action_group->add(
        Gtk::Action::create(
            "insert-subtitle-after", Gtk::Stock::GO_DOWN, _("Insert _After"),
            _("Insert blank subtitle after the selected subtitle")),
        Gtk::AccelKey("Insert"),
        sigc::mem_fun(*this, &InsertSubtitlePlugin::on_insert_subtitle_after));

    // ui
    Glib::RefPtr<Gtk::UIManager> ui = get_ui_manager();

    ui->insert_action_group(action_group);

    Glib::ustring submenu = R"(
      <ui>
        <menubar name='menubar'>
          <menu name='menu-edit' action='menu-edit'>
            <placeholder name='insert-subtitle'>
              <menuitem action='insert-subtitle-before'/>
              <menuitem action='insert-subtitle-after'/>
            </placeholder>
          </menu>
        </menubar>
      </ui>
    )";

    ui_id = ui->add_ui_from_string(submenu);
  }

  void deactivate() {
    se_dbg(SE_DBG_PLUGINS);

    Glib::RefPtr<Gtk::UIManager> ui = get_ui_manager();

    ui->remove_ui(ui_id);
    ui->remove_action_group(action_group);
  }

  void update_ui() {
    se_dbg(SE_DBG_PLUGINS);

    bool visible = (get_current_document() != NULL);

    action_group->get_action("insert-subtitle-before")->set_sensitive(visible);
    action_group->get_action("insert-subtitle-after")->set_sensitive(visible);
  }

 protected:
  void on_insert_subtitle_before() {
    se_dbg(SE_DBG_PLUGINS);

    execute(BEFORE);
  }

  void on_insert_subtitle_after() {
    se_dbg(SE_DBG_PLUGINS);

    execute(AFTER);
  }

  enum POSITION { BEFORE, AFTER };

  bool execute(POSITION pos) {
    se_dbg(SE_DBG_PLUGINS);

    Document *doc = get_current_document();

    g_return_val_if_fail(doc, false);

    doc->start_command(_("Insert Subtitle"));

    Subtitles subtitles = doc->subtitles();

    std::vector<Subtitle> selection = subtitles.get_selection();

    Subtitle sub, newsub;

    // s'il existe des sous-titres
    // et s'il y a une selection on utilise le premier sous-titre
    // sinon on utilise le premier ou le dernier sous-titre
    if (!selection.empty())
      sub = selection[0];
    else if (subtitles.size() != 0)
      sub = (pos == BEFORE) ? subtitles.get_first() : subtitles.get_last();

    if (sub)
      newsub = (pos == BEFORE) ? subtitles.insert_before(sub)
                               : subtitles.insert_after(sub);
    else
      newsub = subtitles.append();

    if (newsub) {
      subtitles.select(newsub);
      // set default time
      set_time_between_subtitles(newsub, subtitles.get_previous(newsub),
                                 subtitles.get_next(newsub));
    }

    doc->finish_command();

    return true;
  }

  void set_time_between_subtitles(Subtitle &sub, const Subtitle &before,
                                  const Subtitle &after) {
    se_dbg(SE_DBG_PLUGINS);

    SubtitleTime gap = cfg::get_int("timing", "min-gap-between-subtitles");
    SubtitleTime min = cfg::get_int("timing", "min-display");

    SubtitleTime start, end;

    if (before) {
      start = before.get_end() + gap;
    }

    sub.set_start(start);

    if (after) {
      end = after.get_start() - gap;
      // si le sous-titre est trop petit on ne respect pas le gap
      if (end < start) {
        end = after.get_start();
      }

      // il est possible d'avoir un sous-titre negative
      // dans ce cas on passe par dessus le suivant
      if (end < start)
        end = start + min;

      sub.set_end(end);
    } else {
      sub.set_duration(min);
    }
  }

 protected:
  Gtk::UIManager::ui_merge_id ui_id;
  Glib::RefPtr<Gtk::ActionGroup> action_group;
};

REGISTER_EXTENSION(InsertSubtitlePlugin)
