/*
 * Copyright (C) 2010-2018 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2011-2015 David Robillard <d@drobilla.net>
 *
 * 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.
 */

#ifndef __gtk2_ardour_step_editor_h__
#define __gtk2_ardour_step_editor_h__

#include <string>

#include <gdk/gdk.h>
#include <sigc++/trackable.h>

#include "pbd/signals.h"

#include "temporal/beats.h"
#include "temporal/timeline.h"

namespace ARDOUR {
class MidiTrack;
class MidiRegion;
class Region;
}

class MidiRegionView;
class MidiTimeAxisView;
class PublicEditor;
class StepEntry;

/** A StepEditor is an object which understands how to interact with the
 * MidiTrack and MidiTimeAxisView APIs to make the changes required during step
 * editing. However, it defers all GUI matters to the StepEntry class, which
 * presents an interface to the user, and then calls StepEditor methods to make
 * changes.
 *
 * The StepEntry is a singleton, used over and over each time the user wants to
 * step edit; the StepEditor is owned by a MidiTimeAxisView and re-used for any
 * step editing in the MidiTrack for which the MidiTimeAxisView is a view.
 */

class StepEditor : public PBD::ScopedConnectionList, public sigc::trackable
{
public:
	StepEditor (PublicEditor&, std::shared_ptr<ARDOUR::MidiTrack>, MidiTimeAxisView&);
	virtual ~StepEditor ();

	void step_entry_done ();

	void check_step_edit ();
	void step_edit_rest (Temporal::Beats beats);
	void step_edit_beat_sync ();
	void step_edit_bar_sync ();
	int  step_add_bank_change (uint8_t channel, uint8_t bank);
	int  step_add_program_change (uint8_t channel, uint8_t program);
	int  step_add_note (uint8_t channel, uint8_t pitch, uint8_t velocity,
	                    Temporal::Beats beat_duration);
	void step_edit_sustain (Temporal::Beats beats);
	bool step_edit_within_triplet () const;
	void step_edit_toggle_triplet ();
	bool step_edit_within_chord () const;
	void step_edit_toggle_chord ();
	void reset_step_edit_beat_pos ();
	void resync_step_edit_to_edit_point ();
	void move_step_edit_beat_pos (Temporal::Beats beats);
	void set_step_edit_cursor_width (Temporal::Beats beats);

	std::string name () const;

	void start_step_editing ();
	void stop_step_editing ();

private:
	Temporal::timepos_t                    step_edit_insert_position;
	Temporal::Beats                        step_edit_beat_pos;
	std::shared_ptr<ARDOUR::MidiRegion>  step_edit_region;
	MidiRegionView*                        step_edit_region_view;
	uint8_t                               _step_edit_triplet_countdown;
	bool                                  _step_edit_within_chord;
	Temporal::Beats                       _step_edit_chord_duration;
	PBD::ScopedConnection                  step_edit_region_connection;
	PublicEditor&                         _editor;
	std::shared_ptr<ARDOUR::MidiTrack>  _track;
	MidiTimeAxisView&                     _mtv;
	int8_t                                 last_added_pitch;
	Temporal::Beats                        last_added_end;

	sigc::connection delete_connection;
	sigc::connection hide_connection;

	void region_removed (std::weak_ptr<ARDOUR::Region>);
	void playlist_changed ();
	bool step_entry_hidden (GdkEventAny*);
	void resync_step_edit_position ();
	void prepare_step_edit_region ();
};

#endif /* __gtk2_ardour_step_editor_h__ */