/*
 * Copyright (C) 2008-2014 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2009-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2009-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2013-2019 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 <vector>

#include <gtkmm/box.h>
#include <gtkmm/adjustment.h>
#include <gtkmm/frame.h>
#include <gtkmm/eventbox.h>
#include <gtkmm/button.h>
#include <gtkmm/table.h>
#include <gtkmm/drawingarea.h>

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

#include "widgets/fastmeter.h"

#include "enums.h"

namespace ARDOUR {
	class Session;
	class PeakMeter;
}
namespace Gtk {
	class Menu;
}

class LevelMeterBase : public ARDOUR::SessionHandlePtr, virtual public sigc::trackable
{
public:
	LevelMeterBase (ARDOUR::Session*, PBD::EventLoop::InvalidationRecord* ir,
			ArdourWidgets::FastMeter::Orientation o = ArdourWidgets::FastMeter::Vertical);
	virtual ~LevelMeterBase ();

	virtual void set_meter (ARDOUR::PeakMeter* meter);

	void update_gain_sensitive ();

	float update_meters ();
	void update_meters_falloff ();
	void clear_meters (bool reset_highlight = true);
	void hide_meters ();
	void setup_meters (int len=0, int width=3, int thin=2);
	void set_max_audio_meter_count (uint32_t cnt = 0);

	/** Emitted in the GUI thread when a button is pressed over the meter */
	PBD::Signal<bool(GdkEventButton *)> ButtonPress;
	PBD::Signal<bool(GdkEventButton *)> ButtonRelease;

protected:
	virtual void mtr_pack(Gtk::Widget &w) = 0;
	virtual void mtr_remove(Gtk::Widget &w) = 0;

private:
	PBD::EventLoop::InvalidationRecord* parent_invalidator;
	ARDOUR::PeakMeter* _meter;
	ArdourWidgets::FastMeter::Orientation _meter_orientation;

	Width _width;

	struct MeterInfo {
		ArdourWidgets::FastMeter* meter;
		gint16                    width;
		int                       length;
		bool                      packed;
		float                     max_peak;

		MeterInfo() {
			meter = 0;
			width = 0;
			length = 0;
			packed = false;
			max_peak = -INFINITY;
		}
	};

	guint16                regular_meter_width;
	int                    meter_length;
	guint16                thin_meter_width;
	std::vector<MeterInfo> meters;
	float                  max_peak;
	ARDOUR::MeterType      visible_meter_type;
	uint32_t               midi_count;
	uint32_t               meter_count;
	uint32_t               max_visible_meters;

	PBD::ScopedConnection _configuration_connection;
	PBD::ScopedConnection _meter_type_connection;
	PBD::ScopedConnection _parameter_connection;

	void hide_all_meters ();
	bool meter_button_press (GdkEventButton *);
	bool meter_button_release (GdkEventButton *);

	void parameter_changed (std::string);
	void configuration_changed (ARDOUR::ChanCount in, ARDOUR::ChanCount out);
	void meter_type_changed (ARDOUR::MeterType);

	bool color_changed;
	void color_handler ();
};

class LevelMeterHBox : public LevelMeterBase, public Gtk::HBox
{
public:
	LevelMeterHBox (ARDOUR::Session*);
	~LevelMeterHBox();

protected:
	void mtr_pack(Gtk::Widget &w);
	void mtr_remove(Gtk::Widget &w);
};

class LevelMeterVBox : public LevelMeterBase, public Gtk::VBox
{
public:
	LevelMeterVBox (ARDOUR::Session*);
	~LevelMeterVBox();

protected:
	void mtr_pack(Gtk::Widget &w);
	void mtr_remove(Gtk::Widget &w);
};