/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "ais_app.hpp"

#include "string_format.hpp"
#include "database.hpp"

#include "baseband_api.hpp"

#include "portapack.hpp"
using namespace portapack;

#include <algorithm>

namespace ais {
namespace format {

static std::string latlon_abs_normalized(const int32_t normalized, const char suffixes[2]) {
	const auto suffix = suffixes[(normalized < 0) ? 0 : 1];
	const uint32_t normalized_abs = std::abs(normalized);
	const uint32_t t = (normalized_abs * 5) / 3;
	const uint32_t degrees = t / (100 * 10000);
	const uint32_t fraction = t % (100 * 10000);
	return to_string_dec_uint(degrees) + "." + to_string_dec_uint(fraction, 6, '0') + suffix;
}

static std::string latlon(const Latitude latitude, const Longitude longitude) {
	if( latitude.is_valid() && longitude.is_valid() ) {
		return latlon_abs_normalized(latitude.normalized(), "SN") + " " + latlon_abs_normalized(longitude.normalized(), "WE");
	} else if( latitude.is_not_available() && longitude.is_not_available() ) {
		return "not available";
	} else {
		return "invalid";
	}
}

static float latlon_float(const int32_t normalized) {
	return ((((float) normalized) * 5) / 3) / (100 * 10000);
}

static std::string mmsi(
	const ais::MMSI& mmsi
) {
	return to_string_dec_uint(mmsi, 9, '0'); // MMSI is always is always 9 characters pre-padded with zeros
}


static std::string mid(
	const ais::MMSI& mmsi
) {
	std::database 			db;
	std::string 			mid_code = "";
	std::database::MidDBRecord 	mid_record = {};
	int 				return_code = 0;

	// Try getting the country name from mids.db using MID code for given MMSI
	mid_code = to_string_dec_uint(mmsi, 9, ' ').substr(0, 3);
	return_code = db.retrieve_mid_record(&mid_record, mid_code);
	switch(return_code) {
		case DATABASE_RECORD_FOUND: 	return mid_record.country;
		case DATABASE_NOT_FOUND: 	return "No mids.db file";
		default:			return "";
	}
}

static std::string text(const std::string &text) {
	size_t end = text.find_last_not_of("@");
    return (end == std::string::npos) ? "" : text.substr(0, end + 1);

}

static std::string navigational_status(const unsigned int value) {
	switch(value) {
		case 0: return "under way w/engine";
		case 1: return "at anchor";
		case 2: return "not under command";
		case 3: return "restricted maneuv";
		case 4: return "constrained draught";
		case 5: return "moored";
		case 6: return "aground";
		case 7: return "fishing";
		case 8: return "sailing";
		case 9: case 10: case 13: return "reserved";
		case 11: return "towing astern";
		case 12: return "towing ahead/along";
		case 14: return "SART/MOB/EPIRB";
		case 15: return "undefined";
		default: return "unknown";
	}
}

static std::string rate_of_turn(const RateOfTurn value) {
	switch(value) {
	case -128: return "not available";
	case -127: return "left >5 deg/30sec";
	case    0: return "0 deg/min";
	case  127: return "right >5 deg/30sec";
	default:
		{
			std::string result = (value < 0) ? "left " : "right ";
			const float value_deg_sqrt = value / 4.733f;
			const int32_t value_deg = value_deg_sqrt * value_deg_sqrt;
			result += to_string_dec_uint(value_deg);
			result += " deg/min";
			return result;
		}
	}
}

static std::string speed_over_ground(const SpeedOverGround value) {
	if( value == 1023 ) {
		return "not available";
	} else if( value == 1022 ) {
		return ">= 102.2 knots";
	} else {
		return to_string_dec_uint(value / 10) + "." + to_string_dec_uint(value % 10, 1) + " knots";
	}
}

static std::string course_over_ground(const CourseOverGround value) {
	if( value > 3600 ) {
		return "invalid";
	} else if( value == 3600 ) {
		return "not available";
	} else {
		return to_string_dec_uint(value / 10) + "." + to_string_dec_uint(value % 10, 1) + " deg";
	}
}

static std::string true_heading(const TrueHeading value) {
	if( value == 511 ) {
		return "not available";
	} else if( value > 359 ) {
		return "invalid";
	} else {
		return to_string_dec_uint(value) + " deg";
	}
}

} /* namespace format */
} /* namespace ais */

void AISLogger::on_packet(const ais::Packet& packet) {
	// TODO: Unstuff here, not in baseband!
	std::string entry;
	entry.reserve((packet.length() + 3) / 4);

	for(size_t i=0; i<packet.length(); i+=4) {
		const auto nibble = packet.read(i, 4);
		entry += (nibble >= 10) ? ('W' + nibble) : ('0' + nibble);
	}

	log_file.write_entry(packet.received_at(), entry);
}

void AISRecentEntry::update(const ais::Packet& packet) {
	received_count++;

	switch(packet.message_id()) {
	case 1:
	case 2:
	case 3:
		navigational_status = packet.read(38, 4);
		last_position.rate_of_turn = packet.read(42, 8);
		last_position.speed_over_ground = packet.read(50, 10);
		last_position.timestamp = packet.received_at();
		last_position.latitude = packet.latitude(89);
		last_position.longitude = packet.longitude(61);
		last_position.course_over_ground = packet.read(116, 12);
		last_position.true_heading = packet.read(128, 9);
		break;

	case 4:
		last_position.timestamp = packet.received_at();
		last_position.latitude = packet.latitude(107);
		last_position.longitude = packet.longitude(79);
		break;

	case 5:
		call_sign = packet.text(70, 7);
		name = packet.text(112, 20);
		destination = packet.text(302, 20);
		break;

	case 18:
	    last_position.timestamp = packet.received_at();
		last_position.speed_over_ground = packet.read(46, 10);
		last_position.latitude = packet.latitude(85);
		last_position.longitude = packet.longitude(57);
		last_position.course_over_ground = packet.read(112, 12);
		last_position.true_heading = packet.read(124, 9);
	    break;

	case 21:
		name = packet.text(43, 20);
		last_position.timestamp = packet.received_at();
		last_position.latitude = packet.latitude(192);
		last_position.longitude = packet.longitude(164);
		break;

	case 24:
		switch (packet.read(38, 2))
		{
		case 0:
			name = packet.text(40, 20);
			break;

		case 1:
			call_sign = packet.text(90, 7);
			break;

		default:
			break;
		}

		break;

	default:
		break;
	}
}

namespace ui {

template<>
void RecentEntriesTable<AISRecentEntries>::draw(
	const Entry& entry,
	const Rect& target_rect,
	Painter& painter,
	const Style& style
) {
	std::string line = ais::format::mmsi(entry.mmsi) + " ";
	if( !entry.name.empty() ) {
		line += ais::format::text(entry.name);
	} else {
		line += ais::format::text(entry.call_sign);
	}

	line.resize(target_rect.width() / 8, ' ');
	painter.draw_string(target_rect.location(), style, line);
}

AISRecentEntryDetailView::AISRecentEntryDetailView(NavigationView& nav) {
	add_children({
		&button_done,
		&button_see_map,
	});

	button_done.on_select = [this](const ui::Button&) {
		if( this->on_close ) {
			this->on_close();
		}
	};

	button_see_map.on_select = [this, &nav](Button&) {
		geomap_view = nav.push<GeoMapView>(
			ais::format::text(entry_.name),
			0,
			GeoPos::alt_unit::METERS,
			ais::format::latlon_float(entry_.last_position.latitude.normalized()),
			ais::format::latlon_float(entry_.last_position.longitude.normalized()),
			entry_.last_position.true_heading,
			[this]() {
				send_updates = false;
			});
			send_updates = true;


	};
}


AISRecentEntryDetailView::AISRecentEntryDetailView(const AISRecentEntryDetailView&Entry) : View()
{
    (void)Entry;
}

AISRecentEntryDetailView & AISRecentEntryDetailView::operator=(const AISRecentEntryDetailView&Entry)
{
    (void)Entry;
    return *this;
}

void AISRecentEntryDetailView::update_position() {
	if (send_updates)
		geomap_view->update_position(ais::format::latlon_float(entry_.last_position.latitude.normalized()), ais::format::latlon_float(entry_.last_position.longitude.normalized()), (float)entry_.last_position.true_heading, 0);
}

void AISRecentEntryDetailView::focus() {
	button_done.focus();
}

Rect AISRecentEntryDetailView::draw_field(
	Painter& painter,
	const Rect& draw_rect,
	const Style& style,
	const std::string& label,
	const std::string& value
) {
	const int label_length_max = 4;

	painter.draw_string(Point { draw_rect.left(), draw_rect.top() }, style, label);
	painter.draw_string(Point { draw_rect.left() + (label_length_max + 1) * 8, draw_rect.top() }, style, value);

	return { draw_rect.left(), draw_rect.top() + draw_rect.height(), draw_rect.width(), draw_rect.height() };
}

void AISRecentEntryDetailView::paint(Painter& painter) {
	View::paint(painter);

	const auto s = style();
	const auto rect = screen_rect();

	auto field_rect = Rect { rect.left(), rect.top() + 16, rect.width(), 16 };

	field_rect = draw_field(painter, field_rect, s, "MMSI", ais::format::mmsi(entry_.mmsi));
	field_rect = draw_field(painter, field_rect, s, "Ctry", ais::format::mid(entry_.mmsi));
	field_rect = draw_field(painter, field_rect, s, "Name", ais::format::text(entry_.name));
	field_rect = draw_field(painter, field_rect, s, "Call", ais::format::text(entry_.call_sign));
	field_rect = draw_field(painter, field_rect, s, "Dest", ais::format::text(entry_.destination));
	field_rect = draw_field(painter, field_rect, s, "Last", to_string_datetime(entry_.last_position.timestamp));
	field_rect = draw_field(painter, field_rect, s, "Pos ", ais::format::latlon(entry_.last_position.latitude, entry_.last_position.longitude));
	field_rect = draw_field(painter, field_rect, s, "Stat", ais::format::navigational_status(entry_.navigational_status));
	field_rect = draw_field(painter, field_rect, s, "RoT ", ais::format::rate_of_turn(entry_.last_position.rate_of_turn));
	field_rect = draw_field(painter, field_rect, s, "SoG ", ais::format::speed_over_ground(entry_.last_position.speed_over_ground));
	field_rect = draw_field(painter, field_rect, s, "CoG ", ais::format::course_over_ground(entry_.last_position.course_over_ground));
	field_rect = draw_field(painter, field_rect, s, "Head", ais::format::true_heading(entry_.last_position.true_heading));
	field_rect = draw_field(painter, field_rect, s, "Rx #", to_string_dec_uint(entry_.received_count));
}

void AISRecentEntryDetailView::set_entry(const AISRecentEntry& entry) {
	entry_ = entry;
	set_dirty();
}

AISAppView::AISAppView(NavigationView& nav) : nav_ { nav } {
	baseband::run_image(portapack::spi_flash::image_tag_ais);

	add_children({
		&label_channel,
		&options_channel,
		&field_rf_amp,
		&field_lna,
		&field_vga,
		&rssi,
		&channel,
		&recent_entries_view,
		&recent_entry_detail_view,
	});


	// load app settings
	auto rc = settings.load("rx_ais", &app_settings);
	if(rc == SETTINGS_OK) {
		field_lna.set_value(app_settings.lna);
		field_vga.set_value(app_settings.vga);
		field_rf_amp.set_value(app_settings.rx_amp);
		target_frequency_ = app_settings.rx_frequency;
	}
	else target_frequency_ = initial_target_frequency;

	recent_entry_detail_view.hidden(true);

    	receiver_model.set_tuning_frequency(tuning_frequency());
    	receiver_model.set_sampling_rate(sampling_rate);
    	receiver_model.set_baseband_bandwidth(baseband_bandwidth);
    	receiver_model.enable();  // Before using radio::enable(), but not updating Ant.DC-Bias.

	options_channel.on_change = [this](size_t, OptionsField::value_t v) {
		this->on_frequency_changed(v);
	};
	options_channel.set_by_value(target_frequency());

	recent_entries_view.on_select = [this](const AISRecentEntry& entry) {
		this->on_show_detail(entry);
	};
	recent_entry_detail_view.on_close = [this]() {
		this->on_show_list();
	};

	logger = std::make_unique<AISLogger>();
	if( logger ) {
		logger->append(u"ais.txt");
	}
}

AISAppView::~AISAppView() {

	// save app settings
	app_settings.rx_frequency = target_frequency_;
	settings.save("rx_ais", &app_settings);

	receiver_model.disable();   // to switch off all, including DC bias.

	baseband::shutdown();
}

void AISAppView::focus() {
	options_channel.focus();
}

void AISAppView::set_parent_rect(const Rect new_parent_rect) {
	View::set_parent_rect(new_parent_rect);
	const Rect content_rect { 0, header_height, new_parent_rect.width(), new_parent_rect.height() - header_height };
	recent_entries_view.set_parent_rect(content_rect);
	recent_entry_detail_view.set_parent_rect(content_rect);
}

void AISAppView::on_packet(const ais::Packet& packet) {
	if( logger ) {
		logger->on_packet(packet);
	}

	auto& entry = ::on_packet(recent, packet.source_id());
	entry.update(packet);
	recent_entries_view.set_dirty();

	// TODO: Crude hack, should be a more formal listener arrangement...
	if( entry.key() == recent_entry_detail_view.entry().key() ) {
		recent_entry_detail_view.set_entry(entry);
		recent_entry_detail_view.update_position();
	}
}

void AISAppView::on_show_list() {
	recent_entries_view.hidden(false);
	recent_entry_detail_view.hidden(true);
	recent_entries_view.focus();
}

void AISAppView::on_show_detail(const AISRecentEntry& entry) {
	recent_entries_view.hidden(true);
	recent_entry_detail_view.hidden(false);
	recent_entry_detail_view.set_entry(entry);
	recent_entry_detail_view.focus();
}

void AISAppView::on_frequency_changed(const uint32_t new_target_frequency) {
	set_target_frequency(new_target_frequency);
}

void AISAppView::set_target_frequency(const uint32_t new_value) {
	target_frequency_ = new_value;
	radio::set_tuning_frequency(tuning_frequency());
}

uint32_t AISAppView::target_frequency() const {
	return target_frequency_;
}

uint32_t AISAppView::tuning_frequency() const {
	return target_frequency() - (sampling_rate / 4);
}

} /* namespace ui */