/*
 *	subtitleeditor -- a tool to create or edit subtitle
 *
 *	https://kitone.github.io/subtitleeditor/
 *	https://github.com/kitone/subtitleeditor/
 *
 *	Copyright @ 2016, 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 <extension/action.h>
#include <utility.h>
#include <documentsystem.h>
#include <memory>
#include <gtkmm_utility.h>
#include <gui/comboboxencoding.h>
#include <gui/comboboxsubtitleformat.h>
#include <gui/comboboxnewline.h>

/*
 */
class DialogTemplate : public Gtk::Dialog
{
public:
	DialogTemplate(BaseObjectType* cobj, const Glib::RefPtr<Gtk::Builder>& xml)
	:Gtk::Dialog(cobj)
	{
		utility::set_transient_parent(*this);

		xml->get_widget("entry-name", m_entryName);
		xml->get_widget_derived("combo-format", m_comboFormat);
		xml->get_widget_derived("combo-encoding", m_comboEncoding);
		xml->get_widget_derived("combo-newline", m_comboNewLine);

		m_comboEncoding->show_auto_detected(false);

		add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
		add_button(Gtk::Stock::SAVE_AS, Gtk::RESPONSE_OK);
	
		set_default_response(Gtk::RESPONSE_OK);
	}

	/*
	 */
	void set_name(const Glib::ustring &name)
	{
		m_entryName->set_text(name);
	}

	/*
	 */
	Glib::ustring get_name()
	{
		return m_entryName->get_text();
	}

	/*
	 */
	void set_charset(const Glib::ustring &charset)
	{
		m_comboEncoding->set_value(charset);
	}

	/*
	 */
	Glib::ustring get_charset()
	{
		return m_comboEncoding->get_value();
	}

	/*
	 */
	void set_format(const Glib::ustring &format)
	{
		m_comboFormat->set_value(format);
	}

	/*
	 */
	Glib::ustring get_format()
	{
		return m_comboFormat->get_value();
	}

	/*
	 */
	void set_newline(const Glib::ustring &newline)
	{
		m_comboNewLine->set_value(newline);
	}

	/*
	 */
	Glib::ustring get_newline()
	{
		return m_comboNewLine->get_value();
	}

public:
	Gtk::Entry* m_entryName;
	ComboBoxEncoding* m_comboEncoding;
	ComboBoxSubtitleFormat* m_comboFormat;
	ComboBoxNewLine* m_comboNewLine;
};

/*
 */
class TemplatePlugin : public Action
{
public:

	TemplatePlugin()
	{
		activate();
		update_ui();
	}

	~TemplatePlugin()
	{
		deactivate();
	}

	/*
	 */
	void activate()
	{
		se_debug(SE_DEBUG_PLUGINS);

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

		action_group->add(
				Gtk::Action::create("template", _("_Template")));

		action_group->add(
				Gtk::Action::create("save-as-template", Gtk::Stock::SAVE_AS, _("_Save As Template"), _("Save the current document as template.")),
				sigc::mem_fun(*this, &TemplatePlugin::on_save_as_template));

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

		ui->insert_action_group(action_group);

		Glib::ustring submenu = 
			"<ui>"
			"	<menubar name='menubar'>"
			"		<menu name='menu-extensions' action='menu-extensions'>"
			"			<placeholder name='placeholder'>"
			"					<menu name='template' action='template'>"
			"						<menuitem action='save-as-template'/>"
			"						<separator/>"
			"						<placeholder name='template-files'/>"
			"					</menu>"
			"			</placeholder>"
			"		</menu>"
			"	</menubar>"
			"</ui>";

		ui_id = ui->add_ui_from_string(submenu);

		rebuild_templates_menu();
	}

	/*
	 */
	void deactivate()
	{
		se_debug(SE_DEBUG_PLUGINS);

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

		if(action_group_templates)
		{
			ui->remove_ui(ui_id_templates);
			ui->remove_action_group(action_group_templates);
		}
		ui->remove_ui(ui_id);
		ui->remove_action_group(action_group);
	}

	/*
	 */
	void update_ui()
	{
		se_debug(SE_DEBUG_PLUGINS);

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

		action_group->get_action("save-as-template")->set_sensitive(visible);
	}

	/*
	 */
	void rebuild_templates_menu()
	{
		Glib::RefPtr<Gtk::UIManager> ui = get_ui_manager();
		// We clean the old ui and action_group
		if(action_group_templates)
		{
			ui->remove_ui(ui_id_templates);
			ui->remove_action_group(action_group_templates);
		}
		// Create new ui and action_group
		action_group_templates = Gtk::ActionGroup::create("TemplatePluginFiles");
		ui->insert_action_group(action_group_templates);

		ui_id_templates = ui->new_merge_id();

		// Read the template directory
		if(initialize_template_directory() == false)
			return;

		// For each files we create an entry
		Glib::Dir dir(get_config_dir("plugins/template"));
		std::vector<Glib::ustring> files(dir.begin(), dir.end());

		for(unsigned int i=0; i< files.size(); ++i)
		{
			add_ui_from_file(i, files[i]);
		}
		// Update the ui
		ui->ensure_update();
	}

	/*
	 */
	void add_ui_from_file(const guint number, const Glib::ustring &filename)
	{
		// We extract from the filename the label and the charset
		Glib::RefPtr<Glib::Regex> re = Glib::Regex::create("^\\[(.*)\\]\\[(.*)\\]$");
		if(re->match(filename) == false)
		{
			// Something wrong...
			return;
		}
		std::vector<Glib::ustring> group = re->split(filename);

		Glib::ustring label = group[1];
		Glib::ustring charset = group[2];
		Glib::ustring fullname = Glib::build_filename(get_config_dir("plugins/template"), filename);

		Glib::ustring action_name = Glib::ustring::compose("template-file-%1", number);
		Glib::ustring action_accel = "";//(number < 10) ? Glib::ustring::compose("<alt>%1", (number+1) % 10) : "";

		action_group_templates->add(
				Gtk::Action::create(action_name, label), Gtk::AccelKey(action_accel),
				sigc::bind(
					sigc::mem_fun(*this, &TemplatePlugin::on_template_activate), fullname, charset));

		get_ui_manager()->add_ui(
				ui_id_templates,
				"/menubar/menu-extensions/placeholder/template/template-files",
				action_name,
				action_name,
				Gtk::UI_MANAGER_MENUITEM,
				false);
	}

	/*
	 */
	void on_template_activate(const Glib::ustring &path, const Glib::ustring &charset)
	{
		Glib::ustring uri = Glib::filename_to_uri(path);

		Document* doc = Document::create_from_file(uri, charset);
		if(doc == NULL)
			return;

		doc->setFilename(DocumentSystem::getInstance().create_untitled_name());
		doc->setCharset(charset);
		DocumentSystem::getInstance().append(doc);
	}

	/*
	 */
	void on_save_as_template()
	{
		Document* current = get_current_document();
		g_return_if_fail(current);

		// create dialog
		std::unique_ptr<DialogTemplate> dialog(
				gtkmm_utility::get_widget_derived<DialogTemplate>(
						SE_DEV_VALUE(SE_PLUGIN_PATH_UI, SE_PLUGIN_PATH_DEV), 
						"dialog-template-save-as.ui", 
						"dialog-template-save-as"));

		dialog->set_name(current->getName());
		dialog->set_format(current->getFormat());
		dialog->set_newline(current->getNewLine());
		dialog->set_charset(current->getCharset());

		if(dialog->run() != Gtk::RESPONSE_OK)
			return;

		std::unique_ptr<Document> newdoc(new Document(*current));
		newdoc->setName(dialog->get_name());
		newdoc->setFormat(dialog->get_format());
		newdoc->setNewLine(dialog->get_newline());
		newdoc->setCharset(dialog->get_charset());

		Glib::ustring uri = Glib::filename_to_uri(
				Glib::build_filename(
					get_config_dir("plugins/template"),
					Glib::ustring::compose("[%1][%2]", newdoc->getName(), newdoc->getCharset())));

		if(newdoc->save(uri) == false)
			return;

		rebuild_templates_menu();
	}


	/*
	 * Check if the template directory exists
	 * Create if needed
	 */
	bool initialize_template_directory()
	{
		se_debug(SE_DEBUG_PLUGINS);

		// Read the template directory
		Glib::ustring path = get_config_dir("plugins/template");
		// Already there ?
		if(Glib::file_test(path, Glib::FILE_TEST_EXISTS | Glib::FILE_TEST_IS_DIR))
			return true;
		// Needs to be created
		try
		{
			Glib::RefPtr<Gio::File> file = Gio::File::create_for_path(path);
			if(file && file->make_directory_with_parents())
				return true;
		}
		catch(...)
		{
		}
		return false;
	}

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

	Gtk::UIManager::ui_merge_id ui_id_templates;
	Glib::RefPtr<Gtk::ActionGroup> action_group_templates;
};

REGISTER_EXTENSION(TemplatePlugin)