// 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 ItalicizeSelectedSubtitlesPlugin : public Action {
 public:
  ItalicizeSelectedSubtitlesPlugin() {
    activate();
    update_ui();
  }

  ~ItalicizeSelectedSubtitlesPlugin() {
    deactivate();
  }

  void activate() {
    se_dbg(SE_DBG_PLUGINS);

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

    action_group->add(
        Gtk::Action::create("italicize-selected-subtitles", Gtk::Stock::ITALIC,
                            _("_Italic"),
                            _("Italicize the selected subtitles text")),
        Gtk::AccelKey("I"),
        sigc::mem_fun(*this, &ItalicizeSelectedSubtitlesPlugin::on_execute));

    // 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='text-formatting'>
              <menuitem action='italicize-selected-subtitles'/>
            </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("italicize-selected-subtitles")
        ->set_sensitive(visible);
  }

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

    execute();
  }

  bool execute() {
    se_dbg(SE_DBG_PLUGINS);

    Document *doc = get_current_document();

    g_return_val_if_fail(doc, false);

    Subtitles subtitles = doc->subtitles();

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

    if (selection.empty()) {
      doc->flash_message(_("Please select at least a subtitle."));
      return false;
    }

    doc->start_command(_("Italic"));

    bool state = !parial_match(selection, "<(i)>(.*?)</\\1>");

    global_replace(selection, "<(i)>(.*)</\\1>", "\\2");

    if (state)
      global_replace(selection, "^(.*)$", "<i>\\1</i>");

    doc->finish_command();

    return true;
  }

  bool parial_match(std::vector<Subtitle> &subs, const std::string &pattern) {
    se_dbg(SE_DBG_PLUGINS);

    Glib::RefPtr<Glib::Regex> re = Glib::Regex::create(pattern);

    for (const auto &sub : subs) {
      if (re->match(sub.get_text()))
        return true;
    }

    return false;
  }

  void global_replace(std::vector<Subtitle> &subs, const std::string &pattern,
                      const std::string &replace) {
    se_dbg(SE_DBG_PLUGINS);

    Glib::RefPtr<Glib::Regex> re =
        Glib::Regex::create(pattern, Glib::REGEX_MULTILINE);

    for (auto &sub : subs) {
      Glib::ustring text = sub.get_text();

      text = re->replace(text, 0, replace, (Glib::RegexMatchFlags)0);

      sub.set_text(text);
    }
  }

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

REGISTER_EXTENSION(ItalicizeSelectedSubtitlesPlugin)
