/*
 * Copyright (C) 2020 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.
 */

#include <gtkmm/alignment.h>
#include <gtkmm/label.h>
#include <gtkmm/stock.h>

#include "pbd/unwind.h"

#include "ardour/dB.h"
#include "ardour/plugin_insert.h"
#include "ardour/plugin_manager.h"
#include "ardour/processor.h"
#include "ardour/session.h"

#include "ardour/export_channel_configuration.h"
#include "ardour/export_filename.h"
#include "ardour/export_format_base.h"
#include "ardour/export_format_specification.h"
#include "ardour/export_handler.h"
#include "ardour/export_status.h"
#include "ardour/export_timespan.h"

#include "gtkmm2ext/menu_elems.h"
#include "gtkmm2ext/utils.h"

#include "widgets/ardour_spacer.h"
#include "widgets/prompter.h"
#include "widgets/tooltips.h"

#include "ardour_message.h"
#include "export_analysis_graphs.h"
#include "export_report.h"
#include "loudness_dialog.h"
#include "ui_config.h"

#include "pbd/i18n.h"

using namespace Gtk;
using namespace ARDOUR;
using namespace ArdourWidgets;

bool LoudnessDialog::_first_time = true;
CLoudnessPreset LoudnessDialog::_last_preset;

LoudnessDialog::LoudnessDialog (Session* s, TimelineRange const& ar, bool as)
	: ArdourDialog (as ? _("Loudness Assistant") : _("Loudness Analyzer and Normalizer"))
	, _lp (false)
	, _session (s)
	, _range (ar)
	, _status (s->get_export_status ())
	, _autostart (as)
	, _conformity_frame (_("Conformity Analysis (with gain applied)"))
	, _save_preset (_("Save"))
	, _remove_preset (_("Remove"))
	, _dbfs_btn (_("Peak:"), ArdourButton::led_default_elements, true)
	, _dbtp_btn (_("True Peak:"), ArdourButton::led_default_elements, true)
	, _lufs_i_btn (_("Integrated Loudness:"), ArdourButton::led_default_elements, true)
	, _lufs_s_btn (_("Max. Short Loudness:"), ArdourButton::led_default_elements, true)
	, _lufs_m_btn (_("Max. Momentary Loudness:"), ArdourButton::led_default_elements, true)
	, _rt_analysis_button (_("Realtime"), ArdourButton::led_default_elements, true)
	, _start_analysis_button (_("Analyze"))
	, _show_report_button (_("Analysis Report"))
	, _custom_pos_button (_("Custom Amplifier Position"), ArdourButton::led_default_elements, true)
	, _dbfs_adjustment (0.00, -10.00, 0.00, 0.1, 0.2)
	, _dbtp_adjustment (-1.0, -10.00, 0.00, 0.1, 0.2)
	, _lufs_i_adjustment (-23.0, -90.00, 0.00, 0.5, 1.0)
	, _lufs_s_adjustment (-20.0, -90.00, 0.00, 0.5, 1.0)
	, _lufs_m_adjustment (-17.0, -90.00, 0.00, 0.5, 1.0)
	, _dbfs_spinbutton (_dbfs_adjustment, 0.1, 1)
	, _dbtp_spinbutton (_dbtp_adjustment, 0.1, 1)
	, _lufs_i_spinbutton (_lufs_i_adjustment, 0.1, 1)
	, _lufs_s_spinbutton (_lufs_s_adjustment, 0.1, 1)
	, _lufs_m_spinbutton (_lufs_m_adjustment, 0.1, 1)
	, _gain_out (0)
	, _gain_norm (0)
	, _ignore_preset (false)
	, _ignore_change (false)
{
	_preset = _lp[0];
	if (_first_time) {
		_first_time = false;
		_last_preset = _lp[0];
	}

	_preset = _last_preset;

	/* Dialog can be displayed from the mixer, override global transient_parent */
	unset_transient_for ();

	/* query initial gain */
	_gain_out = accurate_coefficient_to_dB (_session->master_volume ()->get_value ());

	/* setup styles */
	_start_analysis_button.set_name ("generic button");
	_rt_analysis_button.set_name ("generic button");
	_show_report_button.set_name ("generic button");
	_custom_pos_button.set_name ("generic button");

	_custom_pos_button.set_active (!_session->master_out()->volume_applies_to_output ());

	GtkRequisition req = _start_analysis_button.size_request ();
	_start_analysis_button.set_size_request (-1, req.height * 1.1);
	_rt_analysis_button.set_size_request (-1, req.height * 1.1);

	_save_preset.set_name ("generic button");
	_remove_preset.set_name ("generic button");

	_dbfs_btn.set_name ("generic button");
	_dbtp_btn.set_name ("generic button");
	_lufs_i_btn.set_name ("generic button");
	_lufs_s_btn.set_name ("generic button");
	_lufs_m_btn.set_name ("generic button");

	_dbfs_btn.set_led_left (true);
	_dbtp_btn.set_led_left (true);
	_lufs_i_btn.set_led_left (true);
	_lufs_s_btn.set_led_left (true);
	_lufs_m_btn.set_led_left (true);

	_preset_dropdown.set_can_focus (true);
	_start_analysis_button.set_can_focus (true);
	_rt_analysis_button.set_can_focus (true);
	_show_report_button.set_can_focus (true);
	_custom_pos_button.set_can_focus (true);
	_save_preset.set_can_focus (true);
	_remove_preset.set_can_focus (true);
	_dbfs_btn.set_can_focus (true);
	_dbtp_btn.set_can_focus (true);
	_lufs_i_btn.set_can_focus (true);
	_lufs_s_btn.set_can_focus (true);
	_lufs_m_btn.set_can_focus (true);

	_dbfs_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_dbtp_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_lufs_i_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_lufs_s_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_lufs_m_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());

	_delta_dbfs_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_delta_dbtp_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_delta_lufs_i_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_delta_lufs_s_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_delta_lufs_m_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());

	_gain_out_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_gain_norm_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_gain_total_label.modify_font (UIConfiguration::instance ().get_NormalMonospaceFont ());
	_gain_exceeds_label.modify_font (UIConfiguration::instance ().get_NormalFont ());

	/* result display layout */
#define ROW row, row + 1

	int row = 0;
	Label* l;
	Table* t = manage (new Table (11, 8, false));
	t->set_spacings (4);

	l = manage (new Label (_("Preset:"), ALIGN_START));
	t->attach (*l, 0, 1, ROW, SHRINK | FILL);
	t->attach (_preset_dropdown, 1, 3, ROW);

	t->attach (_save_preset, 3, 4, ROW, SHRINK | FILL);
	t->attach (_remove_preset, 4, 5, ROW, SHRINK | FILL);

	/* horiz space */
	l = manage (new Label (" ", ALIGN_START));
	t->attach (*l, 5, 6, ROW, SHRINK, SHRINK, 6, 0);

	l = manage (new Label (" ", ALIGN_START));
	t->attach (*l, 6, 7, ROW);

	t->attach (_show_report_button, 7, 8, ROW, SHRINK | FILL);

	++row;
	l = manage (new Label (_("<b>Target</b>"), ALIGN_CENTER));
	l->set_use_markup (true);
	t->attach (*l, 2, 3, ROW);
	l = manage (new Label (_("<b>Measured</b>"), ALIGN_CENTER));
	l->set_use_markup (true);
	t->attach (*l, 3, 4, ROW);
	l = manage (new Label (_("<b>Delta</b>"), ALIGN_CENTER));
	l->set_use_markup (true);
	t->attach (*l, 4, 5, ROW);

	row = 2;
	t->attach (_dbfs_btn,   0, 2, ROW); ++row;
	t->attach (_dbtp_btn,   0, 2, ROW); ++row;
	t->attach (_lufs_i_btn, 0, 2, ROW); ++row;
	t->attach (_lufs_s_btn, 0, 2, ROW); ++row;
	t->attach (_lufs_m_btn, 0, 2, ROW); ++row;

	++row; // spacer

	l = manage (new Label (_("Gain to normalize:"), ALIGN_START));
	t->attach (*l, 0, 2, ROW); ++row;
	l = manage (new Label (_("Previous output gain:"), ALIGN_START));
	t->attach (*l, 0, 2, ROW); ++row;

	l = manage (new Label (_("Total gain:"), ALIGN_START));
	t->attach (*l, 0, 2, ROW);

	row = 2;
	t->attach (_dbfs_spinbutton,    2, 3, ROW, EXPAND|FILL, EXPAND|FILL, 8, 0); ++row;
	t->attach (_dbtp_spinbutton,    2, 3, ROW, EXPAND|FILL, EXPAND|FILL, 8, 0); ++row;
	t->attach (_lufs_i_spinbutton,  2, 3, ROW, EXPAND|FILL, EXPAND|FILL, 8, 0); ++row;
	t->attach (_lufs_s_spinbutton,  2, 3, ROW, EXPAND|FILL, EXPAND|FILL, 8, 0); ++row;
	t->attach (_lufs_m_spinbutton,  2, 3, ROW, EXPAND|FILL, EXPAND|FILL, 8, 0); ++row;

	row = 2;
	t->attach (_dbfs_label,         3, 4, ROW); ++row;
	t->attach (_dbtp_label,         3, 4, ROW); ++row;
	t->attach (_lufs_i_label,       3, 4, ROW); ++row;
	t->attach (_lufs_s_label,       3, 4, ROW); ++row;
	t->attach (_lufs_m_label,       3, 4, ROW); ++row;

	row = 2;
	t->attach (_delta_dbfs_label,   4, 5, ROW); ++row;
	t->attach (_delta_dbtp_label,   4, 5, ROW); ++row;
	t->attach (_delta_lufs_i_label, 4, 5, ROW); ++row;
	t->attach (_delta_lufs_s_label, 4, 5, ROW); ++row;
	t->attach (_delta_lufs_m_label, 4, 5, ROW); ++row;

	ArdourHSpacer* spc = manage (new ArdourHSpacer (1.0));
	t->attach (*spc,                3, 5, ROW); ++row;
	t->attach (_gain_norm_label,    4, 5, ROW); ++row;
	t->attach (_gain_out_label,     4, 5, ROW); ++row;
	t->attach (_gain_exceeds_label, 3, 4, ROW);
	t->attach (_gain_total_label,   4, 5, ROW);
	t->attach (_custom_pos_button,  7, 8, row - 1, row + 1, SHRINK | FILL, SHRINK);
	t->attach (_conformity_frame,   6, 8, 1,       row - 3, SHRINK | FILL, EXPAND | FILL, 0, 0);

	set_tooltip (_custom_pos_button,
		_("<b>When enabled</b> an amplifier processor is used to apply the gain. "
		  "This allows for custom positioning of the gain-stage in the master-bus' signal flow, "
		  "potentially followed by a limiter to conform to both loudness and peak requirements. "
		  "Depending on limiter settings or DSP after the gain-stage, repeat loudness measurements may produce different results.\n"
		  "<b>When disabled</b>, the gain is applied directly to the output of the master-bus. This results in an efficient and reliable volume adjustment."
		 ));

	_dbfs_label.set_alignment (ALIGN_END);
	_dbtp_label.set_alignment (ALIGN_END);
	_lufs_i_label.set_alignment (ALIGN_END);
	_lufs_s_label.set_alignment (ALIGN_END);
	_lufs_m_label.set_alignment (ALIGN_END);

	_delta_dbfs_label.set_alignment (ALIGN_END);
	_delta_dbtp_label.set_alignment (ALIGN_END);
	_delta_lufs_i_label.set_alignment (ALIGN_END);
	_delta_lufs_s_label.set_alignment (ALIGN_END);
	_delta_lufs_m_label.set_alignment (ALIGN_END);

	_gain_norm_label.set_alignment (ALIGN_END);
	_gain_out_label.set_alignment (ALIGN_END);
	_gain_total_label.set_alignment (ALIGN_END);
	_gain_exceeds_label.set_alignment (ALIGN_END);

	HBox* hb = manage (new (HBox));
	hb->pack_start (_loudness_graph, true, false);

	_result_box.pack_start (*hb, false, false, 0);
	_result_box.pack_start (*t, false, false, 6);

	/* analysis progress layout */
	_progress_box.pack_start (_progress_bar, false, false, 6);

	/* setup and info layout */
	t = manage (new Table (2, 3, false));
	t->set_spacings (4);
	l = manage (new Label ());
	l->set_markup (_("<b>Loudness Analysis</b>\n"));
	l->set_alignment (ALIGN_START, ALIGN_START);
	t->attach (*l, 0, 1, 0, 1, EXPAND | FILL, FILL, 8, 2);

	l = manage (new Label ());
	l->set_line_wrap ();
	l->set_alignment (ALIGN_START, ALIGN_START);
	l->set_markup (_(
	    "This allows the user to analyze and conform the loudness of the signal at the master-bus "
	    "output of the complete session, as it would be exported. "
	    "When using this feature, remember to disable normalization in the session export profile."));
	t->attach (*l, 0, 1, 1, 2, EXPAND | FILL, FILL, 8, 2);

	l = manage (new Label ());
	l->set_line_wrap ();
	l->set_alignment (ALIGN_START, ALIGN_START);
	l->set_markup (_(
	    "By default, a faster-than-realtime export is used to assess the loudness of the "
	    "session. If any outboard gear is used, a <i>realtime</i> export is available, to "
	    "play at normal speed."));
	t->attach (*l, 0, 1, 2, 3, EXPAND | FILL, FILL, 8, 2);

	Alignment* align = manage (new Alignment (0, 0, 1, 0));
	align->add (_start_analysis_button);
	t->attach (*align, 1, 2, 1, 2, FILL, FILL, 2, 0);

	align = manage (new Alignment (0, 0, 1, 0));
	align->add (_rt_analysis_button);
	t->attach (*align, 1, 2, 2, 3, FILL, FILL, 2, 0);

	_setup_box.pack_start (*t, false, false, 6);

	/* global layout */
	get_vbox ()->pack_start (_setup_box);
	get_vbox ()->pack_start (_progress_box);
	get_vbox ()->pack_start (_result_box);

	_progress_box.set_size_request (400, -1);

	_ok_button     = add_button (Stock::APPLY, RESPONSE_APPLY);
	_cancel_button = add_button (Stock::CANCEL, RESPONSE_CANCEL);

	/* fill in presets */
	for (size_t i = 0; i < _lp.n_presets (); ++i) {
		using namespace Gtkmm2ext;
		_preset_dropdown.AddMenuElem (MenuElemNoMnemonic (_lp[i].label, sigc::bind (sigc::mem_fun (*this, &LoudnessDialog::load_preset), i)));
	}

	apply_preset ();

	if (!_lp.find_preset (_preset)) {
		_preset.label = _("Custom");
	}

	check_preset ();

	_gain_out_label.set_text (string_compose (_("%1 dB"), std::setprecision (2), std::showpos, std::fixed, _gain_out));

	/* setup graph */
	_loudness_graph.signal_size_request ().connect (sigc::mem_fun (*this, &LoudnessDialog::graph_size_request));
	_loudness_graph.signal_expose_event ().connect (sigc::mem_fun (*this, &LoudnessDialog::graph_expose_event));

	/* connect signals */
	_cancel_button->signal_clicked ().connect (sigc::mem_fun (this, &LoudnessDialog::cancel_analysis));
	_dbfs_spinbutton.signal_value_changed ().connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_dbtp_spinbutton.signal_value_changed ().connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_i_spinbutton.signal_value_changed ().connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_s_spinbutton.signal_value_changed ().connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_m_spinbutton.signal_value_changed ().connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_save_preset.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::save_preset));
	_remove_preset.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::remove_preset));
	_show_report_button.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::display_report));
	_start_analysis_button.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::start_analysis));
	_dbfs_btn.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_dbtp_btn.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_i_btn.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_s_btn.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::update_settings));
	_lufs_m_btn.signal_clicked.connect (mem_fun (*this, &LoudnessDialog::update_settings));

	_ok_button->set_sensitive (false);
	_show_report_button.set_sensitive (false);

	show_all_children ();

	_result_box.hide ();
	_progress_box.hide ();
}

void
LoudnessDialog::cancel_analysis ()
{
	if (_status->running ()) {
		_status->abort ();
	}
}

void
LoudnessDialog::start_analysis ()
{
	if (0 == analyze ()) {
		display_results ();
	} else {
		_setup_box.show ();
	}
}

bool
LoudnessDialog::on_delete_event (GdkEventAny* ev)
{
	cancel_analysis ();
	return ArdourDialog::on_delete_event (ev);
}

int
LoudnessDialog::run ()
{
	if (_autostart) {
		show ();
		if (0 == analyze ()) {
			display_results ();
		} else {
			return RESPONSE_CANCEL;
		}
	}

	int const r = ArdourDialog::run ();
	cancel_analysis ();

	if (r == RESPONSE_APPLY) {
		_session->master_volume ()->set_value (dB_to_coefficient (gain_db ()), PBD::Controllable::NoGroup);
		_session->master_out()->set_volume_applies_to_output (!_custom_pos_button.get_active ());

		_last_preset = _preset;
	}

	return r;
}

gint
LoudnessDialog::progress_timeout ()
{
	float progress = ((float)_status->processed_samples_current_timespan) / _status->total_samples_current_timespan;
	_progress_bar.set_text ("Analyzing");
	_progress_bar.set_fraction (progress);
	return true;
}

int
LoudnessDialog::analyze ()
{
	/* These are ensured in Editor::measure_master_loudness () */
	assert (_session->master_out ());
	assert (_session->master_volume ());
	assert (_session->master_out()->output());
	assert (_session->master_out()->output()->n_ports().n_audio() == 2);
	assert (_range.start() < _range.end());

	ExportTimespanPtr tsp = _session->get_export_handler ()->add_timespan ();

	std::shared_ptr<ExportChannelConfiguration> ccp = _session->get_export_handler ()->add_channel_config ();
	std::shared_ptr<ARDOUR::ExportFilename>     fnp = _session->get_export_handler ()->add_filename ();
	std::shared_ptr<ExportFormatSpecification>  fmp = _session->get_export_handler ()->add_format ();

	/* setup format */
	fmp->set_sample_format (ExportFormatBase::SF_Float);
	fmp->set_sample_rate (ExportFormatBase::SR_Session);
	fmp->set_format_id (ExportFormatBase::F_None);
	fmp->set_type (ExportFormatBase::T_None);
	fmp->set_extension ("wav");
	fmp->set_analyse (true);

	/* setup range */
	tsp->set_range (_range.start().samples(), _range.end().samples());
	tsp->set_range_id ("selection");
	tsp->set_realtime (_rt_analysis_button.get_active ());
	tsp->set_name ("master");

	/* setup channels, use master out */
	IO* master_out = _session->master_out ()->output ().get ();
	for (uint32_t n = 0; n < master_out->n_ports ().n_audio (); ++n) {
		PortExportChannel* channel = new PortExportChannel ();
		channel->add_port (master_out->audio (n));
		ExportChannelPtr chan_ptr (channel);
		ccp->register_channel (chan_ptr);
	}

	/* do audio export */
	std::shared_ptr<AudioGrapher::BroadcastInfo> b;
	_session->get_export_handler ()->reset ();
	_session->get_export_handler ()->add_export_config (tsp, ccp, fmp, fnp, b);
	_session->get_export_handler ()->do_export ();

	/* show progress */
	_setup_box.hide ();
	_progress_box.show_all ();

	/* shrink window height (setup box) */
	Gtk::Requisition wr;
	get_size (wr.width, wr.height);
	resize (wr.width, 60);

	sigc::connection progress_connection = Glib::signal_timeout ().connect (sigc::mem_fun (*this, &LoudnessDialog::progress_timeout), 100);

	while (_status->running ()) {
		if (gtk_events_pending ()) {
			gtk_main_iteration ();
		} else {
			Glib::usleep (10000);
		}
	}
	progress_connection.disconnect ();
	_progress_box.hide_all ();

	/* done */
	_status->finish (TRS_UI);

	if (!_status->aborted () && _status->result_map.size () != 1) {
		ArdourMessageDialog (_("Loudness measurement returned no results. Likely because the analyzed range is to short."), false, MESSAGE_ERROR).run ();
		return 1;
	}

	return _status->aborted () ? 1 : 0;
}

void
LoudnessDialog::display_report ()
{
	ExportReport er (_("Export Loudness Report"), _status->result_map);
	er.set_transient_for (*this);
	er.run ();
}

void
LoudnessDialog::save_preset ()
{
	assert (_preset.user);
	ArdourWidgets::Prompter name_prompter (*this, true, true);
	name_prompter.set_title (_("Save Loudness Preset"));
	name_prompter.set_prompt (_("Name:"));
	name_prompter.add_button (_("Save"), Gtk::RESPONSE_ACCEPT);
	name_prompter.set_response_sensitive (Gtk::RESPONSE_ACCEPT, false);
	name_prompter.set_initial_text (_preset.label, _preset.label != _("Custom"));
	name_prompter.show_all ();

	bool        saved = false;
	bool        done  = false;
	std::string result;

	while (!done) {
		switch (name_prompter.run ()) {
			case Gtk::RESPONSE_ACCEPT:
				name_prompter.get_result (result);
				name_prompter.hide ();
				if (result.length()) {
					if (result == _("Custom")) {
						/* ask again */
						continue;
					}
					_preset.label = result;
					_preset.report = false;
					if (_lp.push_back (_preset)) {
						done  = true;
						saved = true;
					} else {
						/* Invalid Name, ask again */
					}
				} else {
					/* nothing entered, just get out of here */
					done = true;
				}
				break;
			default:
				done = true;
				break;
		}
	}
	if (saved) {
		_preset_dropdown.clear_items ();
		for (size_t i = 0; i < _lp.n_presets (); ++i) {
			using namespace Gtkmm2ext;
			_preset_dropdown.AddMenuElem (MenuElemNoMnemonic (_lp[i].label, sigc::bind (sigc::mem_fun (*this, &LoudnessDialog::load_preset), i)));
		}
		PBD::Unwinder<bool> uw (_ignore_preset, true);
		_preset_dropdown.set_active (_preset.label);
		_save_preset.set_sensitive (false);
		_remove_preset.set_sensitive (_preset.user);
	}
}

void
LoudnessDialog::remove_preset ()
{
	assert (_preset.user);
	if (_lp.erase (_preset)) {
		_preset_dropdown.clear_items ();
		for (size_t i = 0; i < _lp.n_presets (); ++i) {
			using namespace Gtkmm2ext;
			_preset_dropdown.AddMenuElem (MenuElemNoMnemonic (_lp[i].label, sigc::bind (sigc::mem_fun (*this, &LoudnessDialog::load_preset), i)));
		}
		_preset.label = _("Custom");
		update_settings ();
	}
}

void
LoudnessDialog::load_preset (size_t n)
{
	if (_ignore_preset) {
		return;
	}
	_preset = _lp[n];
	_save_preset.set_sensitive (false);
	_remove_preset.set_sensitive (_preset.user);
	apply_preset ();
	calculate_gain ();
}

void
LoudnessDialog::apply_preset ()
{
	PBD::Unwinder<bool> uw (_ignore_change, true);
	_preset_dropdown.set_text (_preset.label);

	_dbfs_btn.set_active (_preset.enable[0]);
	_dbtp_btn.set_active (_preset.enable[1]);
	_lufs_i_btn.set_active (_preset.enable[2]);
	_lufs_s_btn.set_active (_preset.enable[3]);
	_lufs_m_btn.set_active (_preset.enable[4]);
	_dbfs_spinbutton.set_value (_preset.level[0]);
	_dbtp_spinbutton.set_value (_preset.level[1]);
	_lufs_i_spinbutton.set_value (_preset.level[2]);
	_lufs_s_spinbutton.set_value (_preset.level[3]);
	_lufs_m_spinbutton.set_value (_preset.level[4]);
	update_sensitivity ();
}

void
LoudnessDialog::update_sensitivity ()
{
	_dbfs_spinbutton.set_sensitive (_dbfs_btn.get_active () && _dbfs_btn.is_sensitive ());
	_dbtp_spinbutton.set_sensitive (_dbtp_btn.get_active () && _dbtp_btn.is_sensitive ());
	_lufs_i_spinbutton.set_sensitive (_lufs_i_btn.get_active () && _dbtp_btn.is_sensitive ());
	_lufs_s_spinbutton.set_sensitive (_lufs_s_btn.get_active () && _lufs_s_btn.is_sensitive ());
	_lufs_m_spinbutton.set_sensitive (_lufs_m_btn.get_active () && _lufs_m_btn.is_sensitive ());
}

void
LoudnessDialog::check_preset ()
{
	if (_lp.find_preset (_preset)) {
		_save_preset.set_sensitive (false);
		_remove_preset.set_sensitive (_preset.user);
	} else {
		if (!_preset.user) {
			_preset.label = _("Custom");
		}
		_preset.user = true;
		_preset.report = false;
		_save_preset.set_sensitive (true);
		_remove_preset.set_sensitive (false);
	}
	_preset_dropdown.set_text (_preset.label);
}

void
LoudnessDialog::update_settings ()
{
	if (_ignore_change) {
		return;
	}

	/* check if preset with current settings exists */
	_preset.level[0]  = _dbfs_spinbutton.get_value ();
	_preset.level[1]  = _dbtp_spinbutton.get_value ();
	_preset.level[2]  = _lufs_i_spinbutton.get_value ();
	_preset.level[3]  = _lufs_s_spinbutton.get_value ();
	_preset.level[4]  = _lufs_m_spinbutton.get_value ();
	_preset.enable[0] = _dbfs_btn.get_active ();
	_preset.enable[1] = _dbtp_btn.get_active ();
	_preset.enable[2] = _lufs_i_btn.get_active ();
	_preset.enable[3] = _lufs_s_btn.get_active ();
	_preset.enable[4] = _lufs_m_btn.get_active ();

	check_preset ();
	update_sensitivity ();
	calculate_gain ();
}

float
LoudnessDialog::gain_db () const
{
	return _gain_norm + _gain_out;
}

void
LoudnessDialog::display_results ()
{
	AnalysisResults const& ar (_status->result_map);
	assert (ar.size () == 1);
	ExportAnalysisPtr p = ar.begin ()->second;

	if (!p->have_loudness || !p->have_dbtp || !p->have_lufs_graph) {
		ArdourMessageDialog (
		    string_compose (_("True-peak and loudness measurement failed. %1-VAMP analysis plugin is missing on your system. Please contact your vendor."), PROGRAM_NAME),
		    false, MESSAGE_ERROR)
		    .run ();
	}

	plot_graph (p);

	_dbfs   = accurate_coefficient_to_dB (p->peak);
	_dbtp   = accurate_coefficient_to_dB (p->truepeak);
	_lufs_i = p->integrated_loudness    > -200 ? p->integrated_loudness    : -std::numeric_limits<float>::infinity ();
	_lufs_s = p->max_loudness_short     > -200 ? p->max_loudness_short     : -std::numeric_limits<float>::infinity ();
	_lufs_m = p->max_loudness_momentary > -200 ? p->max_loudness_momentary : -std::numeric_limits<float>::infinity ();

	_dbfs_btn.set_sensitive (_dbfs > -300);
	_dbtp_btn.set_sensitive (_dbtp > -300);
	_lufs_i_btn.set_sensitive (p->integrated_loudness > -200);
	_lufs_s_btn.set_sensitive (p->max_loudness_short > -200);
	_lufs_m_btn.set_sensitive (p->max_loudness_momentary > -200);

	_dbfs_label.set_text (string_compose (_("%1 dBFS"), std::setprecision (1), std::fixed, _dbfs));
	_dbtp_label.set_text (string_compose (_("%1 dBTP"), std::setprecision (1), std::fixed, _dbtp));
	_lufs_i_label.set_text (string_compose (_("%1 LUFS"), std::setprecision (1), std::fixed, _lufs_i));
	_lufs_s_label.set_text (string_compose (_("%1 LUFS"), std::setprecision (1), std::fixed, _lufs_s));
	_lufs_m_label.set_text (string_compose (_("%1 LUFS"), std::setprecision (1), std::fixed, _lufs_m));

	update_sensitivity ();
	calculate_gain ();

	_result_box.show_all ();
	_show_report_button.set_sensitive (true);
}

void
LoudnessDialog::calculate_gain ()
{
	float dbfs   = _dbfs_spinbutton.get_value ();
	float dbtp   = _dbtp_spinbutton.get_value ();
	float lufs_i = _lufs_i_spinbutton.get_value ();
	float lufs_s = _lufs_s_spinbutton.get_value ();
	float lufs_m = _lufs_m_spinbutton.get_value ();

	float gain     = 0;
	bool  set      = false;

#define MIN_IF_SET(A, B)                 \
  {                                      \
    if (set) {                           \
      gain = std::min (gain, (A) - (B)); \
    } else {                             \
      gain = (A) - (B);                  \
    }                                    \
    set = true;                          \
  }

	if (_dbfs_btn.get_active () && _dbfs_btn.is_sensitive ()) {
		MIN_IF_SET (dbfs, _dbfs);
	}
	if (_dbtp_btn.get_active () && _dbtp_btn.is_sensitive ()) {
		MIN_IF_SET (dbtp, _dbtp);
	}
	if (_lufs_i_btn.get_active () && _lufs_i_btn.is_sensitive ()) {
		MIN_IF_SET (lufs_i, _lufs_i);
	}
	if (_lufs_s_btn.get_active () && _lufs_s_btn.is_sensitive ()) {
		MIN_IF_SET (lufs_s, _lufs_s);
	}
	if (_lufs_m_btn.get_active () && _lufs_m_btn.is_sensitive ()) {
		MIN_IF_SET (lufs_m, _lufs_m);
	}

	_delta_dbfs_label.set_text (string_compose (_("%1 dB"), std::setprecision (2), std::showpos, std::fixed, dbfs - _dbfs));
	_delta_dbtp_label.set_text (string_compose (_("%1 dB"), std::setprecision (2), std::showpos, std::fixed, dbtp - _dbtp));
	_delta_lufs_i_label.set_text (string_compose (_("%1 LU"), std::setprecision (2), std::showpos, std::fixed, lufs_i - _lufs_i));
	_delta_lufs_s_label.set_text (string_compose (_("%1 LU"), std::setprecision (2), std::showpos, std::fixed, lufs_s - _lufs_s));
	_delta_lufs_m_label.set_text (string_compose (_("%1 LU"), std::setprecision (2), std::showpos, std::fixed, lufs_m - _lufs_m));

	_delta_dbfs_label.set_sensitive (_dbfs_btn.get_active ());
	_delta_dbtp_label.set_sensitive (_dbtp_btn.get_active ());
	_delta_lufs_i_label.set_sensitive (_lufs_i_btn.get_active ());
	_delta_lufs_s_label.set_sensitive (_lufs_s_btn.get_active ());
	_delta_lufs_m_label.set_sensitive (_lufs_m_btn.get_active ());

	_gain_norm    = gain;
	bool in_range = gain_db () >= -40 && gain_db () <= 40;

	_gain_norm_label.set_text (string_compose (_("%1 dB"), std::setprecision (2), std::showpos, std::fixed, _gain_norm));
	if (!in_range) {
		_gain_exceeds_label.set_text (_("exceeds"));
		_gain_total_label.set_markup (_(u8"<b>    \u00B140 dB</b>"));
	} else {
		_gain_exceeds_label.set_text (X_(""));
		_gain_total_label.set_markup (string_compose (_("<b>%1 dB</b>"), std::setw (7), std::setprecision (2), std::showpos, std::fixed, gain_db ()));
	}

	test_conformity ();
	_ok_button->set_sensitive (in_range);
}

void
LoudnessDialog::test_conformity ()
{
	if (_conformity_frame.get_child ()) {
		_conformity_frame.remove ();
	}

	const float dbfs = rintf ((_dbfs + _gain_norm) * 10.f) / 10.f;
	const float dbtp = rintf ((_dbtp + _gain_norm) * 10.f) / 10.f;
	const float lufs_i = rintf ((_lufs_i + _gain_norm) * 10.f) / 10.f;

	Table* t      = manage (new Table ());
	size_t n_pset = _lp.n_presets ();
	size_t n_rows = ceil (n_pset / 3.0);

	size_t row = 0;
	size_t col = 0;

	uint32_t c_good = UIConfigurationBase::instance ().color ("alert:green");  // OK / green
	uint32_t c_warn = UIConfigurationBase::instance ().color ("alert:yellow"); // Warning / yellow
	uint32_t c_fail = UIConfigurationBase::instance ().color ("alert:red");    // Fail / red

	Gdk::Color color_good = Gtkmm2ext::gdk_color_from_rgba (c_good);
	Gdk::Color color_warn = Gtkmm2ext::gdk_color_from_rgba (c_warn);
	Gdk::Color color_fail = Gtkmm2ext::gdk_color_from_rgba (c_fail);

	for (size_t i = 1; i < n_pset; ++i) {
		CLoudnessPreset const& preset = _lp[i];
		Label* l = manage (new Label (preset.label + ":", ALIGN_START));
		t->attach (*l, col, col + 1, row, row + 1, EXPAND | FILL, SHRINK, 2, 0);

		if (lufs_i > preset.LUFS_range[0]
		    || (preset.enable[0] && dbfs > preset.level[0])
		    || (preset.enable[1] && dbtp > preset.level[1])
		   ) {
			l = manage (new Label (u8"\u274C", ALIGN_CENTER)); // cross mark
			l->modify_font (UIConfiguration::instance ().get_ArdourBigFont ());
			l->modify_fg (Gtk::STATE_NORMAL, color_fail);
			set_tooltip (*l, "The signal is too loud.");
		} else if (lufs_i < preset.LUFS_range[1]) {
			l = manage (new Label (u8"\U0001F509", ALIGN_CENTER)); // speaker icon w/1 bar
			l->modify_font (UIConfiguration::instance ().get_ArdourBigFont ());
			l->modify_fg (Gtk::STATE_NORMAL, color_warn);
			set_tooltip (*l, "The signal is too quiet, but satisfies the max. loudness spec.");
		} else {
			l = manage (new Label (u8"\u2714", ALIGN_CENTER)); // heavy check mark
			l->modify_font (UIConfiguration::instance ().get_ArdourBigFont ());
			l->modify_fg (Gtk::STATE_NORMAL, color_good);
			set_tooltip (*l, "Signal loudness is within the spec.");
			Gtkmm2ext::set_size_request_to_display_given_text (*l, u8"\u274C\u2713", 0, 0);
		}

		t->attach (*l, col + 1, col + 2, row, row + 1, SHRINK, SHRINK, 2, 0);

		if (++row == n_rows) {
			ArdourVSpacer* spc = manage (new ArdourVSpacer (1.0));
			t->attach (*spc, col + 2, col + 3, 0, n_rows, FILL, EXPAND | FILL, 8, 0);
			row = 0;
			col += 3;
		}
	}

	t->set_border_width (6);
	_conformity_frame.add (*t);
	_conformity_frame.show_all ();
}

void
LoudnessDialog::graph_size_request (Gtk::Requisition* req)
{
	if (_loudness_surf) {
		req->width  = _loudness_surf->get_width ();
		req->height = _loudness_surf->get_height ();
	} else {
		req->width  = 1;
		req->height = 1;
	}
}

bool
LoudnessDialog::graph_expose_event (GdkEventExpose* ev)
{
	Cairo::RefPtr<Cairo::Context> cr = _loudness_graph.get_window ()->create_cairo_context ();
#if 0
	Gtk::Allocation a = _loudness_graph.get_allocation ();
	double const width = a.get_width ();
	double const height = a.get_height ();
#endif

	cr->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
	cr->clip ();

	if (_loudness_surf) {
		cr->set_source (_loudness_surf, 0, 0);
		cr->set_operator (Cairo::OPERATOR_OVER);
		cr->paint ();
	}

	return true;
}

void
LoudnessDialog::plot_graph (ExportAnalysisPtr p)
{
	_loudness_surf = ArdourGraphs::plot_loudness (get_pango_context (), p, -1, 0, _session->nominal_sample_rate ());
	_loudness_graph.queue_resize ();
}