/*
 * Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2014-2017 Robin Gareus <robin@gareus.org>
 *
 * 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 2 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#pragma once

#include <gtkmm/menu.h>

#include "ardour/session_handle.h"
#include "ardour/types.h"

#include "gtkmm2ext/cairo_widget.h"

#include "editor_component.h"

namespace ARDOUR {
	class Session;
	class RouteGroup;
}

class Editor;
class RouteGroupDialog;

/** Parent class for tabs which represent route groups as colored tabs;
 *  Currently used on the left-hand side of the editor and at the top of the mixer.
 *
 *  This class also contains a fair bit of code to handle changes to route
 *  group colours; it seems a bit out of place, but I could not really think
 *  of a better place to put it.
 */
class GroupTabs : public CairoWidget, public ARDOUR::SessionHandlePtr
{
public:
	GroupTabs ();
	virtual ~GroupTabs ();

	void set_session (ARDOUR::Session *);

	/** Create route-group context menu
	 *
	 * @param g Route group, or 0.
	 * @param tabArea false if context menu is not for a group tab, show the "create new from" items here.
	 *                 When true a given group's context menu for the group \p g is displayed.
	 * @return Menu to be popped up on right-click over the given route group.
	 */
	Gtk::Menu* get_menu (ARDOUR::RouteGroup* g, bool tabArea = false);

	void run_new_group_dialog (ARDOUR::RouteList const *, bool with_master);

	void set_extent (double);
	void set_offset (double);

	static void set_group_color (ARDOUR::RouteGroup *, uint32_t);
	static std::string group_gui_id (ARDOUR::RouteGroup *);
	static uint32_t group_color (ARDOUR::RouteGroup *);

protected:

	struct Tab {
		Tab () : group (0) {}

		double from;
		double to;
		uint32_t color; ///< color
		ARDOUR::RouteGroup* group; ///< route group
	};

	/** @return Size of the widget along the primary axis */
	virtual double visible_extent () const = 0;

	/** @return Size of all contained strips along the primary axis */
	double extent () const { return _extent < 0 ? visible_extent () : _extent; }

	/** @return Scroll offset of \ref visible_extent along the primary axis */
	double offset () const { return _offset; }

private:
	static void emit_gui_changed_for_members (std::shared_ptr<ARDOUR::RouteList>);

	/** Compute all the tabs for this widget.
	 *  @return Tabs.
	 */
	virtual std::list<Tab> compute_tabs () const = 0;

	/** Draw a tab.
	 *  @param cr Cairo context.
	 *  @param t Tab.
	 */
	virtual void draw_tab (cairo_t* cr, Tab const & t) = 0;

	/** Coordinate map (editor, mixer)
	 * @param x x-coordinate
	 * @param y y-coordinate
	 * @return x or y, depending on which is the primary coordinate for this widget.
	 */
	virtual double primary_coordinate (double x, double y) const = 0;

	virtual ARDOUR::RouteList routes_for_tab (Tab const * t) const = 0;
	virtual void add_menu_items (Gtk::Menu *, ARDOUR::RouteGroup *) {}
	virtual ARDOUR::RouteList selected_routes () const = 0;

	void add_new_from_items (Gtk::Menu_Helpers::MenuList&);

	void new_from_selection (bool with_master);
	void new_from_rec_enabled (bool with_master);
	void new_from_soloed (bool with_master);

	void new_group_dialog_finished (int, RouteGroupDialog*, ARDOUR::RouteList const *, bool with_master) const;
	void edit_group_dialog_finished (int, RouteGroupDialog*) const;

	void collect (ARDOUR::RouteGroup *);
	void set_activation (ARDOUR::RouteGroup *, bool);
	void edit_group (ARDOUR::RouteGroup *);
	void subgroup (ARDOUR::RouteGroup *, bool, ARDOUR::Placement);
	void un_subgroup (ARDOUR::RouteGroup *);
	void activate_all ();
	void disable_all ();
	void remove_group (ARDOUR::RouteGroup *);

	void render (Cairo::RefPtr<Cairo::Context> const&, cairo_rectangle_t*);
	void on_size_request (Gtk::Requisition *);
	bool on_button_press_event (GdkEventButton *);
	bool on_motion_notify_event (GdkEventMotion *);
	bool on_button_release_event (GdkEventButton *);

	bool on_enter_notify_event (GdkEventCrossing*);
	bool on_leave_notify_event (GdkEventCrossing*);

	Tab * click_to_tab (double, std::list<Tab>::iterator *, std::list<Tab>::iterator *);

	void route_group_property_changed (ARDOUR::RouteGroup *);
	void route_added_to_route_group (ARDOUR::RouteGroup *, std::weak_ptr<ARDOUR::Route>);
	void route_removed_from_route_group (ARDOUR::RouteGroup *, std::weak_ptr<ARDOUR::Route>);

	void assign_group_to_master (uint32_t which, ARDOUR::RouteGroup*, bool rename_master) const;
	void unassign_group_to_master (uint32_t which, ARDOUR::RouteGroup*) const;
	void assign_selection_to_master (uint32_t which);
	void assign_recenabled_to_master (uint32_t which);
	void assign_soloed_to_master (uint32_t which);
	void assign_some_to_master (uint32_t which, ARDOUR::RouteList, std::string vcaname = "");

	ARDOUR::RouteList get_soloed ();
	ARDOUR::RouteList get_rec_enabled ();

	Gtk::Menu* _menu;
	std::list<Tab> _tabs; ///< current list of tabs
	Tab* _dragging; ///< tab being dragged, or 0
	/** routes that were in the tab that is being dragged when the drag started */
	ARDOUR::RouteList _initial_dragging_routes;
	bool _dragging_new_tab; ///< true if we're dragging a new tab
	bool _drag_moved; ///< true if there has been movement during any current drag
	double _drag_fixed; ///< the position of the fixed end of the tab being dragged
	double _drag_moving; ///< the position of the moving end of the tab being dragged
	double _drag_offset; ///< offset from the mouse to the end of the tab being dragged
	double _drag_min; ///< minimum position for drag
	double _drag_max; ///< maximum position for drag
	double _drag_first; ///< first mouse pointer position during drag
	double _extent;
	double _offset;

	bool  _hovering;

	mutable PBD::ScopedConnection _new_route_group_connection;

	/** colors that have been used for new route group tabs */
	static std::list<Gdk::Color> _used_colors;
};