/*
 * Copyright (C) 2013-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2015 André Nusser <andre.nusser@googlemail.com>
 *
 * 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 <cstdio>
#include <iomanip>
#include <sstream>
#include <string>

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <sigc++/bind.h>

#include <gtkmm/filechooserdialog.h>
#include <gtkmm/stock.h>

#include "pbd/gstdio_compat.h"

#include "ardour/profile.h"
#include "ardour/session.h"
#include "ardour/session_directory.h"
#include "ardour/template_utils.h"
#include "ardour_ui.h"
#include "gtkmm2ext/utils.h"
#include "gui_thread.h"
#include "pbd/convert.h"
#include "pbd/error.h"

#include "opts.h"
#include "transcode_video_dialog.h"
#include "utils_videotl.h"

#include "pbd/i18n.h"

using namespace Gtk;
using namespace std;
using namespace PBD;
using namespace ARDOUR;
using namespace VideoUtils;

TranscodeVideoDialog::TranscodeVideoDialog (Session* s, std::string infile)
	: ArdourDialog (_("Transcode/Import Video File "))
	, infn (infile)
	, path_label (_("Output File:"), Gtk::ALIGN_START)
	, browse_button (_("Browse"))
	, transcode_button (_("OK"))
	, abort_button (_("Abort"))
	, progress_label ()
	, aspect_checkbox (_("Height = "))
	, height_adjustment (128, 0, 1920, 1, 16, 0)
	, height_spinner (height_adjustment)
	, ltc_detect (_("Extract LTC from audio and align video"))
	, bitrate_checkbox (_("Manual Override"))
	, bitrate_adjustment (2000, 500, 10000, 10, 100, 0)
	, bitrate_spinner (bitrate_adjustment)
	, debug_checkbox (_("Debug Mode: Print ffmpeg command and output to stdout."))
{
	set_session (s);

	transcoder            = new TranscodeFfmpeg (infile);
	audiofile             = "";
	pending_audio_extract = false;
	aborted               = false;

	set_name ("TranscodeVideoDialog");
	set_modal (true);
	set_skip_taskbar_hint (true);
	set_resizable (false);

	Gtk::Label* l;
	vbox              = manage (new VBox);
	VBox* options_box = manage (new VBox);
	HBox* path_hbox   = manage (new HBox);

	int w = 0, h = 0;
	m_aspect = 16.0 / 9.0;

	TranscodeFfmpeg::FFAudioStreams as;

	path_hbox->pack_start (path_label, false, false, 3);
	path_hbox->pack_start (path_entry, true, true, 3);
	path_hbox->pack_start (browse_button, false, false, 3);

	height_spinner.set_sensitive (false);
	bitrate_spinner.set_sensitive (false);

	std::string dstdir = video_dest_dir (_session->session_directory ().video_path (), video_get_docroot (Config));
	std::string dstfn  = video_dest_file (dstdir, infile);

	path_entry.set_width_chars (38);
	path_entry.set_text (dstfn);

	l = manage (new Label (_("<b>File Information</b>"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
	l->set_use_markup ();
	options_box->pack_start (*l, false, true, 4);

	bool ffok = false;
	if (!transcoder->ffexec_ok ()) {
		l = manage (new Label (_("ffmpeg installation was not found. Video Import is not possible. See the Log window for more information."), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		l->set_line_wrap ();
		options_box->pack_start (*l, false, true, 4);
		aspect_checkbox.set_sensitive (false);
		bitrate_checkbox.set_sensitive (false);
	} else if (!transcoder->probe_ok ()) {
		l = manage (new Label (string_compose (_("File-info can not be read. Most likely '%1' is not a valid video-file or an unsupported video codec or format."), infn), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		options_box->pack_start (*l, false, true, 4);
		aspect_checkbox.set_sensitive (false);
		bitrate_checkbox.set_sensitive (false);
	} else {
		w        = transcoder->get_width ();
		h        = transcoder->get_height ();
		as       = transcoder->get_audio ();
		m_aspect = transcoder->get_aspect ();

		if (w > 0 && h > 0 && transcoder->get_fps () > 0 && transcoder->get_duration () > 0) {
			ffok = true;
		}

		Table* t = manage (new Table (4, 2));
		t->set_spacings (4);
		options_box->pack_start (*t, true, true, 4);
		l = manage (new Label (_("FPS:"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 0, 1, 0, 1);
		l = manage (new Label (_("Duration:"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 2, 3, 0, 1);
		l = manage (new Label (_("Codec:"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 0, 1, 1, 2);
		l = manage (new Label (_("Geometry:"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 2, 3, 1, 2);

		std::ostringstream osstream;
		osstream << transcoder->get_fps ();
		l = manage (new Label (osstream.str (), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 1, 2, 0, 1);

		osstream.str ("");
		osstream << w << "x" << h;
		l = manage (new Label (osstream.str (), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 3, 4, 1, 2);

		osstream.str ("");
		if (transcoder->get_duration () == 0 || transcoder->get_fps () == 0) {
			osstream << _("??");
		} else {
			unsigned long sec = transcoder->get_duration () / transcoder->get_fps ();
			osstream << setfill ('0') << setw (2);
			osstream << (sec / 3600) << ":";
			osstream << setfill ('0') << setw (2);
			osstream << ((sec / 60) % 60) << ":";
			osstream << setfill ('0') << setw (2);
			osstream << (sec % 60) << ":";
			osstream << setfill ('0') << setw (2);
			osstream << (transcoder->get_duration () % (int)floor (transcoder->get_fps ()));
		}
		l = manage (new Label (osstream.str (), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 3, 4, 0, 1);

		osstream.str ("");
		osstream << transcoder->get_codec ();
		l = manage (new Label (osstream.str (), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
		t->attach (*l, 1, 2, 1, 2);
	}

	l = manage (new Label (_("<b>Import Settings</b>"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
	l->set_use_markup ();
	options_box->pack_start (*l, false, true, 4);

	if (ffok) {
		video_combo.append (_("Reference from Current Location (Previously Transcoded Files Only)"));
		video_combo.append (_("Import/Transcode Video to Session"));
		video_combo.set_active (1);
		if (as.size () > 0) {
			video_combo.append (_("Do Not Import Video (Audio Import Only)"));
			audio_combo.set_sensitive (true);
		} else {
			audio_combo.set_sensitive (false);
		}
		video_combo.set_sensitive (true);
		transcode_button.set_sensitive (true);
		path_entry.set_sensitive (true);
		browse_button.set_sensitive (true);
	} else if (as.size () > 0) {
		video_combo.append (_("Do Not Import Video (Audio Import Only)"));
		video_combo.set_active (0);
		path_entry.set_text ("");

		video_combo.set_sensitive (false);
		audio_combo.set_sensitive (true);
		transcode_button.set_sensitive (true);
		path_entry.set_sensitive (false);
		browse_button.set_sensitive (false);
	} else {
		video_combo.append (_("Do Not Import Video"));
		video_combo.set_active (0);
		path_entry.set_text ("");
		video_combo.set_sensitive (false);
		audio_combo.set_sensitive (false);
		transcode_button.set_sensitive (false);
		path_entry.set_sensitive (false);
		browse_button.set_sensitive (false);
	}

	options_box->pack_start (video_combo, false, false, 4);

	Table* t = manage (new Table (4, 4));
	t->set_spacings (4);
	options_box->pack_start (*t, true, true, 4);

	l = manage (new Label (_("Scale Video: Width = "), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
	t->attach (*l, 0, 1, 0, 1);
	t->attach (scale_combo, 1, 2, 0, 1);
	t->attach (aspect_checkbox, 2, 3, 0, 1);
	t->attach (height_spinner, 3, 4, 0, 1);

	scale_combo.append (_("Original Width"));
	if (w > 1920) {
		scale_combo.append ("1920 (hd1080)");
	}
	if (w > 1408) {
		scale_combo.append ("1408 (16cif)");
	}
	if (w > 1280) {
		scale_combo.append ("1280 (sxga, hd720)");
	}
	if (w > 1024) {
		scale_combo.append ("1024 (xga)");
	}
	if (w > 852) {
		scale_combo.append (" 852 (hd480)");
	}
	if (w > 768) {
		scale_combo.append (" 768 (PAL)");
	}
	if (w > 720) {
		scale_combo.append (" 720 (PAL)");
	}
	if (w > 640) {
		scale_combo.append (" 640 (vga, ega)");
	}
	if (w > 352) {
		scale_combo.append (" 352 (cif)");
	}
	if (w > 320) {
		scale_combo.append (" 320 (cga, qvga)");
	}
	if (w > 176) {
		scale_combo.append (" 176 (qcif)");
	}
	scale_combo.set_active (0);
	height_spinner.set_value (h);

	l = manage (new Label (_("Bitrate (KBit/s):"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
	t->attach (*l, 0, 1, 1, 2);
	t->attach (bitrate_checkbox, 2, 3, 1, 2);
	t->attach (bitrate_spinner, 3, 4, 1, 2);

	l = manage (new Label (_("Extract Audio:"), Gtk::ALIGN_START, Gtk::ALIGN_CENTER, false));
	t->attach (*l, 0, 1, 2, 3);
	t->attach (audio_combo, 1, 4, 2, 3);
	t->attach (ltc_detect, 1, 4, 3, 4);

	if (as.size () == 0) {
		audio_combo.append (_("No Audio Track Present"));
		audio_combo.set_sensitive (false);
	} else {
		audio_combo.append (_("Do Not Extract Audio"));
		for (TranscodeFfmpeg::FFAudioStreams::iterator it = as.begin (); it < as.end (); ++it) {
			audio_combo.append ((*it).name);
		}
	}
	audio_combo.set_active (0);
	ltc_detect.set_sensitive (false);

	options_box->pack_start (debug_checkbox, false, true, 4);

	vbox->pack_start (*path_hbox, false, false);
	vbox->pack_start (*options_box, false, true);

	get_vbox ()->set_spacing (4);
	get_vbox ()->pack_start (*vbox, false, false);

	progress_box = manage (new VBox);
	progress_box->set_spacing (6);
	progress_box->pack_start (progress_label, false, false);
	progress_box->pack_start (pbar, false, false);
	progress_box->pack_start (abort_button, false, false);
	get_vbox ()->pack_start (*progress_box, false, false);

	browse_button.signal_clicked ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::open_browse_dialog));
	transcode_button.signal_clicked ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::launch_transcode));
	abort_button.signal_clicked ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::abort_clicked));

	video_combo.signal_changed ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::video_combo_changed));
	audio_combo.signal_changed ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::audio_combo_changed));
	scale_combo.signal_changed ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::scale_combo_changed));
	aspect_checkbox.signal_toggled ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::aspect_checkbox_toggled));
	height_spinner.signal_changed ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::update_bitrate));
	bitrate_checkbox.signal_toggled ().connect (sigc::mem_fun (*this, &TranscodeVideoDialog::bitrate_checkbox_toggled));

	update_bitrate ();

	cancel_button = add_button (Stock::CANCEL, RESPONSE_CANCEL);
	get_action_area ()->pack_start (transcode_button, false, false);

	show_all_children ();
	progress_box->hide ();
}

TranscodeVideoDialog::~TranscodeVideoDialog ()
{
	delete transcoder;
}

void
TranscodeVideoDialog::on_show ()
{
	Dialog::on_show ();
}

void
TranscodeVideoDialog::abort_clicked ()
{
	aborted = true;
	transcoder->cancel ();
}

void
TranscodeVideoDialog::update_progress (samplecnt_t c, samplecnt_t a)
{
	if (a == 0 || c > a) {
		pbar.set_pulse_step (.5);
		pbar.pulse ();
		return;
	}
	pbar.set_fraction ((double)c / (double)a);
}

void
TranscodeVideoDialog::finished (int status)
{
	if (aborted || status != 0) {
		if (!aborted) {
			ARDOUR_UI::instance ()->popup_error (_("Video transcoding failed."));
		}
		::g_unlink (path_entry.get_text ().c_str ());
		if (!audiofile.empty ()) {
			::g_unlink (audiofile.c_str ());
		}
		Gtk::Dialog::response (RESPONSE_CANCEL);
	} else {
		if (pending_audio_extract) {
			StartNextStage (); /* EMIT SIGNAL */
		} else {
			Gtk::Dialog::response (RESPONSE_ACCEPT);
		}
	}
}

void
TranscodeVideoDialog::launch_audioonly ()
{
	if (audio_combo.get_active_row_number () == 0) {
		finished (0);
		return;
	}
	dialog_progress_mode ();
	if (debug_checkbox.get_active ()) {
		transcoder->set_debug (true);
	}
	transcoder->Progress.connect (*this, invalidator (*this), std::bind (&TranscodeVideoDialog::update_progress, this, _1, _2), gui_context ());
	transcoder->Finished.connect (*this, invalidator (*this), std::bind (&TranscodeVideoDialog::finished, this, _1), gui_context ());
	launch_extract ();
}

void
TranscodeVideoDialog::launch_extract ()
{
	audiofile             = path_entry.get_text () + ".wav"; /* TODO: mktemp */
	pending_audio_extract = false;
	aborted               = false;
	int audio_stream      = audio_combo.get_active_row_number () - 1;

	progress_label.set_text (_("Extracting Audio"));

	if (!transcoder->extract_audio (audiofile, _session->nominal_sample_rate (), audio_stream)) {
		ARDOUR_UI::instance ()->popup_error (_("Audio Extraction Failed."));
		audiofile = "";
		Gtk::Dialog::response (RESPONSE_CANCEL);
		return;
	}
}

void
TranscodeVideoDialog::dialog_progress_mode ()
{
	vbox->hide ();
	cancel_button->hide ();
	transcode_button.hide ();
	pbar.set_size_request (300, -1);
	progress_box->show ();
}

void
TranscodeVideoDialog::launch_transcode ()
{
	if (video_combo.get_active_row_number () != 1) {
		launch_audioonly ();
		return;
	}
	std::string outfn = path_entry.get_text ();
	if (!confirm_video_outfn (*this, outfn, video_get_docroot (Config)))
		return;
	progress_label.set_text (_("Transcoding Video"));
	dialog_progress_mode ();
	if (debug_checkbox.get_active ()) {
		transcoder->set_debug (true);
	}

	aborted = false;
	if (audio_combo.get_active_row_number () != 0) {
		pending_audio_extract = true;
		StartNextStage.connect (*this, invalidator (*this), std::bind (&TranscodeVideoDialog::launch_extract, this), gui_context ());
	}

	int scale_width, scale_height, bitrate;
	if (scale_combo.get_active_row_number () == 0) {
		scale_width = 0;
	} else {
		scale_width = atoi (scale_combo.get_active_text ());
	}
	if (!aspect_checkbox.get_active ()) {
		scale_height = 0;
	} else {
		scale_height = (int)floor (height_spinner.get_value ());
	}
	if (bitrate_checkbox.get_active ()) {
		bitrate = (int)floor (bitrate_spinner.get_value ());
	} else {
		bitrate = 0;
	}

	transcoder->Progress.connect (*this, invalidator (*this), std::bind (&TranscodeVideoDialog::update_progress, this, _1, _2), gui_context ());
	transcoder->Finished.connect (*this, invalidator (*this), std::bind (&TranscodeVideoDialog::finished, this, _1), gui_context ());
	if (!transcoder->transcode (outfn, scale_width, scale_height, bitrate)) {
		ARDOUR_UI::instance ()->popup_error (_("Transcoding Failed."));
		Gtk::Dialog::response (RESPONSE_CANCEL);
		return;
	}
}

void
TranscodeVideoDialog::video_combo_changed ()
{
	const int i = video_combo.get_active_row_number ();
	if (i != 1) {
		scale_combo.set_sensitive (false);
		aspect_checkbox.set_sensitive (false);
		height_spinner.set_sensitive (false);
		bitrate_checkbox.set_sensitive (false);
		bitrate_spinner.set_sensitive (false);
	} else {
		scale_combo.set_sensitive (true);
		aspect_checkbox.set_sensitive (true);
		height_spinner.set_sensitive (true);
		bitrate_checkbox.set_sensitive (true);
		bitrate_spinner.set_sensitive (true);
	}
	if (i == 2 && audio_combo.get_active_row_number () == 0) {
		audio_combo.set_active (1);
	} else {
		//update LTC option sensitivity
		audio_combo_changed ();
	}
}

void
TranscodeVideoDialog::audio_combo_changed ()
{
	if (video_combo.get_active_row_number () == 2 && audio_combo.get_active_row_number () == 0) {
		audio_combo.set_active (1);
		ltc_detect.set_sensitive (false);
		ltc_detect.set_active (false);
	}

	if (video_combo.get_active_row_number () != 2 && audio_combo.get_active_row_number () > 0) {
		ltc_detect.set_sensitive (true);
	} else {
		ltc_detect.set_sensitive (false);
		ltc_detect.set_active (false);
	}
}

void
TranscodeVideoDialog::scale_combo_changed ()
{
	if (!aspect_checkbox.get_active ()) {
		int h;
		if (scale_combo.get_active_row_number () == 0) {
			h = transcoder->get_height ();
		} else {
			h = floor (atof (scale_combo.get_active_text ()) / m_aspect);
		}
		height_spinner.set_value (h);
	}
	update_bitrate ();
}

void
TranscodeVideoDialog::aspect_checkbox_toggled ()
{
	height_spinner.set_sensitive (aspect_checkbox.get_active ());
	scale_combo_changed ();
}

void
TranscodeVideoDialog::bitrate_checkbox_toggled ()
{
	bitrate_spinner.set_sensitive (bitrate_checkbox.get_active ());
	if (!bitrate_checkbox.get_active ()) {
		update_bitrate ();
	}
}

void
TranscodeVideoDialog::update_bitrate ()
{
	double br = .7; /* avg quality - bits per pixel */
	if (bitrate_checkbox.get_active () || !transcoder->probe_ok ()) {
		return;
	}
	br *= transcoder->get_fps ();
	br *= height_spinner.get_value ();

	if (scale_combo.get_active_row_number () == 0) {
		br *= transcoder->get_width ();
	} else {
		br *= atof (scale_combo.get_active_text ());
	}
	if (br != 0) {
		bitrate_spinner.set_value (floor (br / 10000.0) * 10);
	}
}

void
TranscodeVideoDialog::open_browse_dialog ()
{
	Gtk::FileChooserDialog dialog (_("Save Transcoded Video File"), Gtk::FILE_CHOOSER_ACTION_SAVE);
	dialog.set_filename (path_entry.get_text ());
	Gtkmm2ext::add_volume_shortcuts (dialog);

	dialog.add_button (Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
	dialog.add_button (Gtk::Stock::OK, Gtk::RESPONSE_OK);

	int result = dialog.run ();

	if (result == Gtk::RESPONSE_OK) {
		std::string filename = dialog.get_filename ();

		if (filename.length ()) {
			path_entry.set_text (filename);
		}
	}
}

enum VtlTranscodeOption
TranscodeVideoDialog::import_option ()
{
	int i = video_combo.get_active_row_number ();
	return static_cast<VtlTranscodeOption> (i);
}