/*
 * Copyright (C) 2010-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2010-2018 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2013 Michael Fisher <mfisher31@gmail.com>
 * Copyright (C) 2014-2015 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 <cstdint>
#include <sstream>

#include <sys/time.h>
#include <time.h>

#include "pbd/localtime_r.h"
#include "pbd/timersub.h"

#include "midi++/parser.h"

#include "ardour/async_midi_port.h"
#include "ardour/midi_port.h"
#include "ardour/audioengine.h"
#include "ardour/transport_master_manager.h"

#include "midi_tracer.h"
#include "gui_thread.h"
#include "pbd/i18n.h"

unsigned int MidiTracer::window_count = 0;

using namespace Gtk;
using namespace std;
using namespace MIDI;
using namespace Glib;
using namespace ARDOUR;

MidiTracer::MidiTracer ()
	: ArdourWindow (_("MIDI Tracer"))
	, line_count_adjustment (200, 1, 2000, 1, 10)
	, line_count_spinner (line_count_adjustment)
	, line_count_label (_("Line history: "))
	, _last_receipt (0)
	, autoscroll (true)
	, show_hex (true)
	, show_delta_time (false)
	, fifo (1024)
	, buffer_pool ("miditracer", buffer_size, 1024) // 1024 256 byte buffers
	, autoscroll_button (_("Auto-Scroll"))
	, base_button (_("Decimal"))
	, collect_button (_("Enabled"))
	, delta_time_button (_("Delta times"))
{
	_update_queued.store (0);

	std::string portname (string_compose(X_("x-MIDI-tracer-%1"), ++window_count));
	std::shared_ptr<ARDOUR::Port> port = AudioEngine::instance()->register_input_port (DataType::MIDI, portname, false,  PortFlags (IsInput | Hidden | IsTerminal));
	tracer_port                          = std::dynamic_pointer_cast<MidiPort> (port);

	_midi_port_list = ListStore::create (_midi_port_cols);
	_midi_port_combo.set_model (_midi_port_list);
	_midi_port_combo.pack_start (_midi_port_cols.pretty_name);

	AudioEngine::instance()->PortRegisteredOrUnregistered.connect
		(_manager_connection, invalidator (*this), std::bind (&MidiTracer::ports_changed, this), gui_context());

	VBox* vbox = manage (new VBox);
	vbox->set_spacing (4);

	HBox* pbox = manage (new HBox);
	pbox->set_spacing (6);
	pbox->pack_start (*manage (new Label (_("Port:"))), false, false);

	_midi_port_combo.signal_changed().connect (sigc::mem_fun (*this, &MidiTracer::port_changed));
	pbox->pack_start (_midi_port_combo);
	pbox->show_all ();
	vbox->pack_start (*pbox, false, false);

	scroller.add (text);
	vbox->set_border_width (12);
	vbox->pack_start (scroller, true, true);

	text.show ();
	text.set_name ("MidiTracerTextView");
	scroller.show ();
	scroller.set_size_request (400, 400);

	collect_button.set_active (true);
	base_button.set_active (false);
	autoscroll_button.set_active (true);

	line_count_box.set_spacing (6);
	line_count_box.pack_start (line_count_label, false, false);
	line_count_box.pack_start (line_count_spinner, false, false);

	line_count_spinner.show ();
	line_count_label.show ();
	line_count_box.show ();

	HBox* bbox = manage (new HBox);
	bbox->add (line_count_box);
	bbox->add (delta_time_button);
	bbox->add (base_button);
	bbox->add (collect_button);
	bbox->add (autoscroll_button);
	bbox->show ();

	vbox->pack_start (*bbox, false, false);

	add (*vbox);

	base_button.signal_toggled().connect (sigc::mem_fun (*this, &MidiTracer::base_toggle));
	collect_button.signal_toggled().connect (sigc::mem_fun (*this, &MidiTracer::collect_toggle));
	autoscroll_button.signal_toggled().connect (sigc::mem_fun (*this, &MidiTracer::autoscroll_toggle));
	delta_time_button.signal_toggled().connect (sigc::mem_fun (*this, &MidiTracer::delta_toggle));

	base_button.show ();
	collect_button.show ();
	autoscroll_button.show ();

	ports_changed ();
	port_changed ();
}

MidiTracer::~MidiTracer()
{
	disconnect ();
	AudioEngine::instance ()->unregister_port (tracer_port);
}

void
MidiTracer::on_show ()
{
	ArdourWindow::on_show ();
	collect_toggle ();
}

void
MidiTracer::on_hide ()
{
	ArdourWindow::on_hide ();
	disconnect ();
}

void
MidiTracer::ports_changed ()
{
	TreeModel::iterator r = _midi_port_combo.get_active ();
	string              cpn;
	if (r) {
		cpn = (*r)[_midi_port_cols.port_name];
	}

	_midi_port_list->clear ();

	if (!AudioEngine::instance()->running()) {
		return;
	}

	PortManager::PortList pl;
	AudioEngine::instance()->get_ports (DataType::MIDI, pl);

	std::vector<std::string> pp;
	AudioEngine::instance ()->get_physical_inputs (DataType::MIDI, pp, MidiPortFlags (0), MidiPortFlags (MidiPortControl | MidiPortVirtual));
	/* ideally we'd also list external (JACK) ports
	 * however there is no convenient API
	 * `PortManager::get_ports (const string& port_name_pattern, DataType type, PortFlags flags, vector<string>& s)`
	 * lists ALL ports and we'd need to filter any outputs (sinks), except our own sinks (which can be traced).
	 */

	size_t nth = 0;
	size_t act = 0;

	/* physical I/Os first */
	for (auto const& pn : pp) {
		if (!cpn.empty () && pn == cpn) {
			act = nth;
		}
		++nth;
		std::string ppn = AudioEngine::instance()->get_pretty_name_by_name (pn);
		if (ppn.empty ()) {
			ppn = pn.substr (pn.find (':') + 1);
		}
		TreeModel::Row row               = *_midi_port_list->append ();
		row[_midi_port_cols.pretty_name] = string_compose (_("HW: %1"), ppn);
		row[_midi_port_cols.port_name]   = pn;
	}

	/* Ardour owned ports */
	for (auto const& p : pl) {
		if (p->flags() & Hidden) {
			continue;
		}
		std::string const& pn = p->name ();
		if (!cpn.empty () && pn == cpn) {
			act = nth;
		}
		++nth;
		std::string ppn = p->pretty_name (false);
		if (ppn.empty ()) {
			ppn = pn.substr (pn.find (':') + 1);
		}
		TreeModel::Row row               = *_midi_port_list->append ();
		row[_midi_port_cols.pretty_name] = ppn;
		row[_midi_port_cols.port_name]   = pn;
	}

	if (nth > 0) {
		_midi_port_combo.set_active (act);
	}
}

void
MidiTracer::port_changed ()
{
	using namespace ARDOUR;

	disconnect ();

	TreeModel::iterator r = _midi_port_combo.get_active ();
	if (!r) {
		return;
	}

	std::string const pn = (*r)[_midi_port_cols.port_name];

	std::shared_ptr<ARDOUR::Port> p = AudioEngine::instance()->get_port_by_name (pn);

	if (!p) {
		/* connect to external port */
		if (0 == tracer_port->connect (pn)) {
			_midi_parser = std::shared_ptr<MIDI::Parser> (new MIDI::Parser);
			_midi_parser->any.connect_same_thread (_parser_connection, std::bind (&MidiTracer::tracer, this, _1, _2, _3, _4));
			tracer_port->set_trace (_midi_parser);
		} else {
			std::cerr << "CANNOT TRACE PORT " << pn << "\n";
		}
		return;
	}

	/* The inheritance hierarchy makes this messy. AsyncMIDIPort has two
	 * available MIDI::Parsers what we could connect to, ::self_parser()
	 * (from ARDOUR::MidiPort) and ::parser() from MIDI::Port. One day,
	 * this mess will all go away ...
	 */

	/* Some ports have a parser available (Transport Masters and ASYNC ports)
	 * and some do not. If the port has a parser already, just attach to it.
	 * If not use our local parser and tell the port that we need it to be called.
	 */

	std::shared_ptr<AsyncMIDIPort> async = std::dynamic_pointer_cast<AsyncMIDIPort> (p);

	if (!async) {

		std::shared_ptr<MidiPort> mp = std::dynamic_pointer_cast<MidiPort> (p);
		if (mp) {
			if (mp->flags() & TransportMasterPort) {
				std::shared_ptr<TransportMaster> tm = TransportMasterManager::instance().master_by_port(std::dynamic_pointer_cast<ARDOUR::Port> (p));
				std::shared_ptr<TransportMasterViaMIDI> tm_midi = std::dynamic_pointer_cast<TransportMasterViaMIDI> (tm);
				if (tm_midi) {
					tm_midi->transport_parser().any.connect_same_thread(_parser_connection, std::bind (&MidiTracer::tracer, this, _1, _2, _3, _4));
				}
			} else {
				_midi_parser = std::shared_ptr<MIDI::Parser> (new MIDI::Parser);
				_midi_parser->any.connect_same_thread (_parser_connection, std::bind (&MidiTracer::tracer, this, _1, _2, _3, _4));
				mp->set_trace (_midi_parser);
				traced_port = mp;
			}
		}

	} else {
		async->parser()->any.connect_same_thread (_parser_connection, std::bind (&MidiTracer::tracer, this, _1, _2, _3, _4));
	}
}

void
MidiTracer::disconnect ()
{
	_parser_connection.disconnect ();

	tracer_port->disconnect_all ();
	tracer_port->set_trace (std::weak_ptr<MIDI::Parser>());

	if (traced_port) {
		traced_port->set_trace (std::weak_ptr<MIDI::Parser>());
		traced_port.reset ();
	}
	_midi_parser.reset ();
}

void
MidiTracer::tracer (Parser&, MIDI::byte* msg, size_t len, samplecnt_t now)
{
	stringstream ss;
	char* buf;
	size_t bufsize;
	size_t s;

	buf = (char *) buffer_pool.alloc ();
	bufsize = buffer_size;

	if (_last_receipt != 0 && show_delta_time) {
		s = snprintf (buf, bufsize, "+%12" PRId64, now - _last_receipt);
		bufsize -= s;
	} else {
		s = snprintf (buf, bufsize, "%12" PRId64, now);
		bufsize -= s;
	}

	_last_receipt = now;

	switch ((eventType) msg[0]&0xf0) {
	case off:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x %02x\n", "NoteOff", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d %-3d\n", "NoteOff", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		}
		break;

	case on:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x %02x\n", "NoteOn", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d %-3d\n", "NoteOn", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		}
		break;

	case polypress:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x %02x\n", "PolyPressure", (msg[0]&0xf)+1, (int) msg[1], msg[2]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d %-3d\n", "PolyPressure", (msg[0]&0xf)+1, (int) msg[1], msg[2]);
		}
		break;

	case MIDI::controller:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x %02x\n", "Controller", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %2d %-3d\n", "Controller", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		}
		break;

	case program:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x\n", "Program Change", (msg[0]&0xf)+1, (int) msg[1]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d\n", "Program Change", (msg[0]&0xf)+1, (int) msg[1]);
		}
		break;

	case chanpress:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x\n", "Channel Pressure", (msg[0]&0xf)+1, (int) msg[1]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d\n", "Channel Pressure", (msg[0]&0xf)+1, (int) msg[1]);
		}
		break;

	case MIDI::pitchbend:
		if (show_hex) {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %02x %02x\n", "Pitch Bend", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		} else {
			s += snprintf (&buf[s], bufsize, "%16s chn %2d %-3d %-3d\n", "Pitch Bend", (msg[0]&0xf)+1, (int) msg[1], (int) msg[2]);
		}
		break;

	case MIDI::sysex:
		if (len == 1) {
			switch (msg[0]) {
			case 0xf8:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Clock");
				break;
			case 0xf9:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Tick");
				break;
			case 0xfa:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Start");
				break;
			case 0xfb:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Continue");
				break;
			case 0xfc:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Stop");
				break;
			case 0xfe:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Active Sense");
				break;
			case 0xff:
				s += snprintf (&buf[s], bufsize, "%16s\n", "Reset");
				break;
			default:
				s += snprintf (&buf[s], bufsize, "%16s %02x\n", "Sysex", (int) msg[1]);
				break;
			}

		} else if (len > 5 && msg[0] == 0xf0 && msg[1] == 0x7f && msg[3] == 0x06) {
			/* MMC */
			int cmd = msg[4];
			if (cmd == 0x44 && msg[5] == 0x06 && msg[6] == 0x01) {
				s += snprintf (
					&buf[s], bufsize, " MMC locate to %02d:%02d:%02d:%02d.%02d\n",
					msg[7], msg[8], msg[9], msg[10], msg[11]
					);
			} else if (cmd == 0x47 && msg[5] == 0x03) {
				uint8_t sh = msg[6];
				uint8_t sm = msg[7];
				uint8_t sl = msg[8];

				bool   forward    = sh & (1<<6) ? false : true;
				size_t left_shift = sh & 0x38;
				size_t integral   = ((sh & 0x7) << left_shift) | (sm >> (7 - left_shift));
				size_t fractional = ((sm << left_shift) << 7) | sl;

				float shuttle_speed = integral + ((float)fractional / (1 << (14 - left_shift)));

				s += snprintf (&buf[s], bufsize, " MMC Shuttle %s%f\n", forward ? "+" : "-", shuttle_speed);
			} else {
				std::string name;
				switch (cmd) {
					case 0x01:
						name = "Stop";
						break;
					case 0x02:
						name = "Play";
						break;
					case 0x03:
						name = "Deferred Play";
						break;
					case 0x04:
						name = "Fast Forward";
						break;
					case 0x05:
						name = "Rewind";
						break;
					case 0x06:
						name = "Record Strobe";
						break;
					case 0x07:
						name = "Record Exit";
						break;
					case 0x08:
						name = "Record Pause";
						break;
					case 0x09:
						name = "Pause";
						break;
					case 0x0a:
						name = "Eject";
						break;
					case 0x0b:
						name = "Chase";
						break;
					case 0x40:
						name = "Write (ARM Tracks)";
						break;
					case 0x0d:
						name = "MMC Reset";
						break;
					default:
						break;
				}
				if (!name.empty()) {
					s += snprintf (&buf[s], bufsize, " MMC command %s\n", name.c_str());
				} else {
					s += snprintf (&buf[s], bufsize, " MMC command %02x\n", cmd);
				}
			}

		} else if (len == 10 && msg[0] == 0xf0 && msg[1] == 0x7f && msg[9] == 0xf7)  {

			/* MTC full sample */
			s += snprintf (&buf[s], bufsize, " MTC full sample to %02d:%02d:%02d:%02d\n", msg[5] & 0x1f, msg[6], msg[7], msg[8]);
		} else if (len == 3 && msg[0] == MIDI::position) {

			/* MIDI Song Position */
			int midi_beats = (msg[2] << 7) | msg[1];
			s += snprintf (&buf[s], bufsize, "%16s %d\n", "Position", (int) midi_beats);
		} else if (len == 2 && msg[0] == MIDI::mtc_quarter) {

			s += snprintf (&buf[s], bufsize, "%16s %02x\n", "MTC Quarter", msg[1]);

		} else {

			/* other sys-ex */

			s += snprintf (&buf[s], bufsize, "%16s (%" PRId64 ") = [", "Sysex", len);
			bufsize -= s;

			for (unsigned int i = 0; i < len && bufsize > 3; ++i) {
				if (i > 0) {
					s += snprintf (&buf[s], bufsize, " %02x", msg[i]);
				} else {
					s += snprintf (&buf[s], bufsize, "%02x", msg[i]);
				}
				bufsize -= s;
			}
			s += snprintf (&buf[s], bufsize, "]\n");
		}
		break;

	case MIDI::song:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Song");
		break;

	case MIDI::tune:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Tune");
		break;

	case MIDI::eox:
		s += snprintf (&buf[s], bufsize, "%16s\n", "EOX");
		break;

	case MIDI::timing:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Timing");
		break;

	case MIDI::start:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Start");
		break;

	case MIDI::stop:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Stop");
		break;

	case MIDI::contineu:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Continue");
		break;

	case active:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Active Sense");
		break;

	default:
		s += snprintf (&buf[s], bufsize, "%16s\n", "Unknown");
		break;
	}

	// If you want to append more to the line, uncomment this first
	// bufsize -= s;

	assert(s <= buffer_size); // clang dead-assignment

	fifo.write (&buf, 1);

	int canderef (0);
	if (_update_queued.compare_exchange_strong (canderef, 1)) {
		gui_context()->call_slot (invalidator (*this), std::bind (&MidiTracer::update, this));
	}
}

void
MidiTracer::update ()
{
	bool updated = false;
	_update_queued.store (0);

	RefPtr<TextBuffer> buf (text.get_buffer());

	int excess = buf->get_line_count() - line_count_adjustment.get_value();

	if (excess > 0) {
		buf->erase (buf->begin(), buf->get_iter_at_line (excess));
	}

	char *str;

	while (fifo.read (&str, 1)) {
		buf->insert (buf->end(), string (str));
		buffer_pool.release (str);
		updated = true;
	}

	if (updated && autoscroll) {
		scroller.get_vadjustment()->set_value (scroller.get_vadjustment()->get_upper());
	}
}

void
MidiTracer::base_toggle ()
{
	show_hex = !base_button.get_active();
}

void
MidiTracer::delta_toggle ()
{
	show_delta_time = delta_time_button.get_active();
}

void
MidiTracer::collect_toggle ()
{
	if (collect_button.get_active ()) {
		port_changed ();
	} else {
		disconnect ();
	}
}

void
MidiTracer::autoscroll_toggle ()
{
	autoscroll = autoscroll_button.get_active ();
}