#include "MSXJoystick.hh"

#include "CommandController.hh"

#include "Event.hh"

#include "IntegerSetting.hh"

#include "JoystickManager.hh"

#include "MSXEventDistributor.hh"

#include "StateChange.hh"

#include "StateChangeDistributor.hh"

#include "serialize.hh"

#include "serialize_meta.hh"

#include "join.hh"

#include "ranges.hh"

#include "unreachable.hh"

#include "xrange.hh"

#include <algorithm>

namespace openmsx {

TclObject MSXJoystick::getDefaultConfig(JoystickId joyId, const JoystickManager& joystickManager)

{

	auto buttons = joystickManager.getNumButtons(joyId);

	if (!buttons) return {};

	TclObject listA, listB;

	auto joy = joyId.str();

	for (auto b : xrange(*buttons)) {

		((b & 1) ? listB : listA).addListElement(tmpStrCat(joy, " button", b));

	}

	return TclObject(TclObject::MakeDictTag{},

		"UP",    makeTclList(tmpStrCat(joy, " -axis1"), tmpStrCat(joy, " hat0 up")),

		"DOWN",  makeTclList(tmpStrCat(joy, " +axis1"), tmpStrCat(joy, " hat0 down")),

		"LEFT",  makeTclList(tmpStrCat(joy, " -axis0"), tmpStrCat(joy, " hat0 left")),

		"RIGHT", makeTclList(tmpStrCat(joy, " +axis0"), tmpStrCat(joy, " hat0 right")),

		"A",     listA,

		"B",     listB);

}

MSXJoystick::MSXJoystick(CommandController& commandController_,

                         MSXEventDistributor& eventDistributor_,

                         StateChangeDistributor& stateChangeDistributor_,

                         JoystickManager& joystickManager_,

                         uint8_t id_)

	: commandController(commandController_)

	, eventDistributor(eventDistributor_)

	, stateChangeDistributor(stateChangeDistributor_)

	, joystickManager(joystickManager_)

	, configSetting(commandController, tmpStrCat("msxjoystick", id_, "_config"),

		"msxjoystick mapping configuration", getDefaultConfig(JoystickId(id_ - 1), joystickManager).getString())

	, description(strCat("MSX joystick ", id_, ". Mapping is fully configurable."))

	, id(id_)

{

	configSetting.setChecker([this](const TclObject& newValue) {

		this->checkJoystickConfig(newValue); });

	try {

		// fill in 'bindings'

		checkJoystickConfig(configSetting.getValue());

	} catch (MSXException& /*e*/) {

		configSetting.setValue(getDefaultConfig(JoystickId(id - 1), joystickManager));

	}

}

MSXJoystick::~MSXJoystick()

{

	if (isPluggedIn()) {

		MSXJoystick::unplugHelper(EmuTime::dummy());

	}

}

void MSXJoystick::checkJoystickConfig(const TclObject& newValue)

{

	std::array<std::vector<BooleanInput>, 6> newBindings;

	auto& interp = commandController.getInterpreter();

	auto n = newValue.getListLength(interp);

	if (n & 1) {

		throw CommandException("Need an even number of elements");

	}

	for (decltype(n) i = 0; i < n; i += 2) {

		static constexpr std::array<std::string_view, 6> keys = {

			// order is important!

			"UP", "DOWN", "LEFT", "RIGHT", "A", "B"

		};

		std::string_view key  = newValue.getListIndex(interp, i + 0).getString();

		auto it = std::ranges::find(keys, key);

		if (it == keys.end()) {

			throw CommandException(

				"Invalid key: must be one of ", join(keys, ", "));

		}

		auto idx = std::distance(keys.begin(), it);

		TclObject value = newValue.getListIndex(interp, i + 1);

		for (auto j : xrange(value.getListLength(interp))) {

			std::string_view val = value.getListIndex(interp, j).getString();

			auto bind = parseBooleanInput(val);

			if (!bind) {

				throw CommandException("Invalid binding: ", val);

			}

			newBindings[idx].push_back(*bind);

		}

	}

	// only change current bindings when parsing was fully successful

	copy_to_range(newBindings, bindings);

}

// Pluggable

zstring_view MSXJoystick::getName() const

{

	switch (id) {

		case 1: return "msxjoystick1";

		case 2: return "msxjoystick2";

		default: UNREACHABLE;

	}

}

zstring_view MSXJoystick::getDescription() const

{

	return description;

}

void MSXJoystick::plugHelper(Connector& /*connector*/, EmuTime /*time*/)

{

	eventDistributor.registerEventListener(*this);

	stateChangeDistributor.registerListener(*this);

}

void MSXJoystick::unplugHelper(EmuTime /*time*/)

{

	stateChangeDistributor.unregisterListener(*this);

	eventDistributor.unregisterEventListener(*this);

}

// MSXJoystickDevice

uint8_t MSXJoystick::read(EmuTime /*time*/)

{

	return pin8 ? 0x3F : status;

}

void MSXJoystick::write(uint8_t value, EmuTime /*time*/)

{

	pin8 = (value & 0x04) != 0;

}

// MSXEventListener

void MSXJoystick::signalMSXEvent(const Event& event,

                                 EmuTime time) noexcept

{

	uint8_t press = 0;

	uint8_t release = 0;

	auto getJoyDeadThreshold = [&](JoystickId joyId) {

		return joystickManager.getJoyDeadThreshold(joyId);

	};

	for (int i : xrange(6)) {

		for (const auto& binding : bindings[i]) {

			if (auto onOff = match(binding, event, getJoyDeadThreshold)) {

				(*onOff ? press : release) |= 1 << i;

			}

		}

	}

	if (((status & ~press) | release) != status) {

		stateChangeDistributor.distributeNew<MSXJoyState>(

			time, id, press, release);

	}

}

// StateChangeListener

void MSXJoystick::signalStateChange(const StateChange& event)

{

	const auto* mjs = std::get_if<MSXJoyState>(&event);

	if (!mjs) return;

	if (mjs->getId() != id) return;

	status = (status & ~mjs->getPress()) | mjs->getRelease();

}

void MSXJoystick::stopReplay(EmuTime time) noexcept

{

	uint8_t newStatus = JOY_UP | JOY_DOWN | JOY_LEFT | JOY_RIGHT |

	                    JOY_BUTTONA | JOY_BUTTONB;

	if (newStatus != status) {

		uint8_t release = newStatus & ~status;

		stateChangeDistributor.distributeNew<MSXJoyState>(

			time, id, uint8_t(0), release);

	}

}

template<typename Archive>

void MSXJoystick::serialize(Archive& ar, unsigned /*version*/)

{

	ar.serialize("status", status);

	if constexpr (Archive::IS_LOADER) {

		if (isPluggedIn()) {

			plugHelper(*getConnector(), EmuTime::dummy());

		}

	}

	// no need to serialize 'pin8'

}

INSTANTIATE_SERIALIZE_METHODS(MSXJoystick);

REGISTER_POLYMORPHIC_INITIALIZER(Pluggable, MSXJoystick, "MSXJoystick");

} // namespace openmsx