/*************************************************************************/
/*  input_default.cpp                                                    */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "input_default.h"

#include "core/input_map.h"
#include "core/os/os.h"
#include "main/default_controller_mappings.h"
#include "scene/resources/texture.h"
#include "servers/visual_server.h"

void InputDefault::SpeedTrack::update(const Vector2 &p_delta_p) {

	uint64_t tick = OS::get_singleton()->get_ticks_usec();
	uint32_t tdiff = tick - last_tick;
	float delta_t = tdiff / 1000000.0;
	last_tick = tick;

	accum += p_delta_p;
	accum_t += delta_t;

	if (accum_t > max_ref_frame * 10)
		accum_t = max_ref_frame * 10;

	while (accum_t >= min_ref_frame) {

		float slice_t = min_ref_frame / accum_t;
		Vector2 slice = accum * slice_t;
		accum = accum - slice;
		accum_t -= min_ref_frame;

		speed = (slice / min_ref_frame).linear_interpolate(speed, min_ref_frame / max_ref_frame);
	}
}

void InputDefault::SpeedTrack::reset() {
	last_tick = OS::get_singleton()->get_ticks_usec();
	speed = Vector2();
	accum_t = 0;
}

InputDefault::SpeedTrack::SpeedTrack() {

	min_ref_frame = 0.1;
	max_ref_frame = 0.3;
	reset();
}

bool InputDefault::is_key_pressed(int p_scancode) const {

	_THREAD_SAFE_METHOD_
	return keys_pressed.has(p_scancode);
}

bool InputDefault::is_mouse_button_pressed(int p_button) const {

	_THREAD_SAFE_METHOD_
	return (mouse_button_mask & (1 << (p_button - 1))) != 0;
}

static int _combine_device(int p_value, int p_device) {

	return p_value | (p_device << 20);
}

bool InputDefault::is_joy_button_pressed(int p_device, int p_button) const {

	_THREAD_SAFE_METHOD_
	return joy_buttons_pressed.has(_combine_device(p_button, p_device));
}

bool InputDefault::is_action_pressed(const StringName &p_action) const {

	return action_state.has(p_action) && action_state[p_action].pressed;
}

bool InputDefault::is_action_just_pressed(const StringName &p_action) const {

	const Map<StringName, Action>::Element *E = action_state.find(p_action);
	if (!E)
		return false;

	if (Engine::get_singleton()->is_in_physics_frame()) {
		return E->get().pressed && E->get().physics_frame == Engine::get_singleton()->get_physics_frames();
	} else {
		return E->get().pressed && E->get().idle_frame == Engine::get_singleton()->get_idle_frames();
	}
}

bool InputDefault::is_action_just_released(const StringName &p_action) const {

	const Map<StringName, Action>::Element *E = action_state.find(p_action);
	if (!E)
		return false;

	if (Engine::get_singleton()->is_in_physics_frame()) {
		return !E->get().pressed && E->get().physics_frame == Engine::get_singleton()->get_physics_frames();
	} else {
		return !E->get().pressed && E->get().idle_frame == Engine::get_singleton()->get_idle_frames();
	}
}

float InputDefault::get_action_strength(const StringName &p_action) const {
	const Map<StringName, Action>::Element *E = action_state.find(p_action);
	if (!E)
		return 0.0f;

	return E->get().strength;
}

float InputDefault::get_joy_axis(int p_device, int p_axis) const {

	_THREAD_SAFE_METHOD_
	int c = _combine_device(p_axis, p_device);
	if (_joy_axis.has(c)) {
		return _joy_axis[c];
	} else {
		return 0;
	}
}

String InputDefault::get_joy_name(int p_idx) {

	_THREAD_SAFE_METHOD_
	return joy_names[p_idx].name;
};

Vector2 InputDefault::get_joy_vibration_strength(int p_device) {
	if (joy_vibration.has(p_device)) {
		return Vector2(joy_vibration[p_device].weak_magnitude, joy_vibration[p_device].strong_magnitude);
	} else {
		return Vector2(0, 0);
	}
}

uint64_t InputDefault::get_joy_vibration_timestamp(int p_device) {
	if (joy_vibration.has(p_device)) {
		return joy_vibration[p_device].timestamp;
	} else {
		return 0;
	}
}

float InputDefault::get_joy_vibration_duration(int p_device) {
	if (joy_vibration.has(p_device)) {
		return joy_vibration[p_device].duration;
	} else {
		return 0.f;
	}
}

static String _hex_str(uint8_t p_byte) {

	static const char *dict = "0123456789abcdef";
	char ret[3];
	ret[2] = 0;

	ret[0] = dict[p_byte >> 4];
	ret[1] = dict[p_byte & 0xf];

	return ret;
};

void InputDefault::joy_connection_changed(int p_idx, bool p_connected, String p_name, String p_guid) {

	_THREAD_SAFE_METHOD_
	Joypad js;
	js.name = p_connected ? p_name : "";
	js.uid = p_connected ? p_guid : "";

	if (p_connected) {

		String uidname = p_guid;
		if (p_guid == "") {
			int uidlen = MIN(p_name.length(), 16);
			for (int i = 0; i < uidlen; i++) {
				uidname = uidname + _hex_str(p_name[i]);
			};
		};
		js.uid = uidname;
		js.connected = true;
		int mapping = fallback_mapping;
		for (int i = 0; i < map_db.size(); i++) {
			if (js.uid == map_db[i].uid) {
				mapping = i;
				js.name = map_db[i].name;
			};
		};
		js.mapping = mapping;
	} else {
		js.connected = false;
		for (int i = 0; i < JOY_BUTTON_MAX; i++) {

			if (i < JOY_AXIS_MAX)
				set_joy_axis(p_idx, i, 0.0f);

			int c = _combine_device(i, p_idx);
			joy_buttons_pressed.erase(c);
		};
	};
	joy_names[p_idx] = js;

	emit_signal("joy_connection_changed", p_idx, p_connected);
};

Vector3 InputDefault::get_gravity() const {

	_THREAD_SAFE_METHOD_
	return gravity;
}

Vector3 InputDefault::get_accelerometer() const {

	_THREAD_SAFE_METHOD_
	return accelerometer;
}

Vector3 InputDefault::get_magnetometer() const {

	_THREAD_SAFE_METHOD_
	return magnetometer;
}

Vector3 InputDefault::get_gyroscope() const {

	_THREAD_SAFE_METHOD_
	return gyroscope;
}

void InputDefault::parse_input_event(const Ref<InputEvent> &p_event) {

	_parse_input_event_impl(p_event, false);
}

void InputDefault::_parse_input_event_impl(const Ref<InputEvent> &p_event, bool p_is_emulated) {

	// Notes on mouse-touch emulation:
	// - Emulated mouse events are parsed, that is, re-routed to this method, so they make the same effects
	//   as true mouse events. The only difference is the situation is flagged as emulated so they are not
	//   emulated back to touch events in an endless loop.
	// - Emulated touch events are handed right to the main loop (i.e., the SceneTree) because they don't
	//   require additional handling by this class.

	_THREAD_SAFE_METHOD_

	Ref<InputEventKey> k = p_event;
	if (k.is_valid() && !k->is_echo() && k->get_scancode() != 0) {
		if (k->is_pressed())
			keys_pressed.insert(k->get_scancode());
		else
			keys_pressed.erase(k->get_scancode());
	}

	Ref<InputEventMouseButton> mb = p_event;

	if (mb.is_valid()) {

		if (mb->is_pressed()) {
			mouse_button_mask |= (1 << (mb->get_button_index() - 1));
		} else {
			mouse_button_mask &= ~(1 << (mb->get_button_index() - 1));
		}

		Point2 pos = mb->get_global_position();
		if (mouse_pos != pos) {
			set_mouse_position(pos);
		}

		if (main_loop && emulate_touch_from_mouse && !p_is_emulated && mb->get_button_index() == 1) {
			Ref<InputEventScreenTouch> touch_event;
			touch_event.instance();
			touch_event->set_pressed(mb->is_pressed());
			touch_event->set_position(mb->get_position());
			main_loop->input_event(touch_event);
		}
	}

	Ref<InputEventMouseMotion> mm = p_event;

	if (mm.is_valid()) {

		Point2 pos = mm->get_global_position();
		if (mouse_pos != pos) {
			set_mouse_position(pos);
		}

		if (main_loop && emulate_touch_from_mouse && !p_is_emulated && mm->get_button_mask() & 1) {
			Ref<InputEventScreenDrag> drag_event;
			drag_event.instance();

			drag_event->set_position(mm->get_position());
			drag_event->set_relative(mm->get_relative());
			drag_event->set_speed(mm->get_speed());

			main_loop->input_event(drag_event);
		}
	}

	Ref<InputEventScreenTouch> st = p_event;

	if (st.is_valid()) {

		if (st->is_pressed()) {
			SpeedTrack &track = touch_speed_track[st->get_index()];
			track.reset();
		} else {
			// Since a pointer index may not occur again (OSs may or may not reuse them),
			// imperatively remove it from the map to keep no fossil entries in it
			touch_speed_track.erase(st->get_index());
		}

		if (emulate_mouse_from_touch) {

			bool translate = false;
			if (st->is_pressed()) {
				if (mouse_from_touch_index == -1) {
					translate = true;
					mouse_from_touch_index = st->get_index();
				}
			} else {
				if (st->get_index() == mouse_from_touch_index) {
					translate = true;
					mouse_from_touch_index = -1;
				}
			}

			if (translate) {
				Ref<InputEventMouseButton> button_event;
				button_event.instance();

				button_event->set_device(InputEvent::DEVICE_ID_TOUCH_MOUSE);
				button_event->set_position(st->get_position());
				button_event->set_global_position(st->get_position());
				button_event->set_pressed(st->is_pressed());
				button_event->set_button_index(BUTTON_LEFT);
				if (st->is_pressed()) {
					button_event->set_button_mask(mouse_button_mask | (1 << (BUTTON_LEFT - 1)));
				} else {
					button_event->set_button_mask(mouse_button_mask & ~(1 << (BUTTON_LEFT - 1)));
				}

				_parse_input_event_impl(button_event, true);
			}
		}
	}

	Ref<InputEventScreenDrag> sd = p_event;

	if (sd.is_valid()) {

		SpeedTrack &track = touch_speed_track[sd->get_index()];
		track.update(sd->get_relative());
		sd->set_speed(track.speed);

		if (emulate_mouse_from_touch && sd->get_index() == mouse_from_touch_index) {

			Ref<InputEventMouseMotion> motion_event;
			motion_event.instance();

			motion_event->set_device(InputEvent::DEVICE_ID_TOUCH_MOUSE);
			motion_event->set_position(sd->get_position());
			motion_event->set_global_position(sd->get_position());
			motion_event->set_relative(sd->get_relative());
			motion_event->set_speed(sd->get_speed());
			motion_event->set_button_mask(mouse_button_mask);

			_parse_input_event_impl(motion_event, true);
		}
	}

	Ref<InputEventJoypadButton> jb = p_event;

	if (jb.is_valid()) {

		int c = _combine_device(jb->get_button_index(), jb->get_device());

		if (jb->is_pressed())
			joy_buttons_pressed.insert(c);
		else
			joy_buttons_pressed.erase(c);
	}

	Ref<InputEventJoypadMotion> jm = p_event;

	if (jm.is_valid()) {
		set_joy_axis(jm->get_device(), jm->get_axis(), jm->get_axis_value());
	}

	Ref<InputEventGesture> ge = p_event;

	if (ge.is_valid()) {

		if (main_loop) {
			main_loop->input_event(ge);
		}
	}

	for (const Map<StringName, InputMap::Action>::Element *E = InputMap::get_singleton()->get_action_map().front(); E; E = E->next()) {
		if (InputMap::get_singleton()->event_is_action(p_event, E->key())) {

			// Save the action's state
			if (!p_event->is_echo() && is_action_pressed(E->key()) != p_event->is_action_pressed(E->key())) {
				Action action;
				action.physics_frame = Engine::get_singleton()->get_physics_frames();
				action.idle_frame = Engine::get_singleton()->get_idle_frames();
				action.pressed = p_event->is_action_pressed(E->key());
				action.strength = 0.f;
				action_state[E->key()] = action;
			}
			action_state[E->key()].strength = p_event->get_action_strength(E->key());
		}
	}

	if (main_loop)
		main_loop->input_event(p_event);
}

void InputDefault::set_joy_axis(int p_device, int p_axis, float p_value) {

	_THREAD_SAFE_METHOD_
	int c = _combine_device(p_axis, p_device);
	_joy_axis[c] = p_value;
}

void InputDefault::start_joy_vibration(int p_device, float p_weak_magnitude, float p_strong_magnitude, float p_duration) {
	_THREAD_SAFE_METHOD_
	if (p_weak_magnitude < 0.f || p_weak_magnitude > 1.f || p_strong_magnitude < 0.f || p_strong_magnitude > 1.f) {
		return;
	}
	VibrationInfo vibration;
	vibration.weak_magnitude = p_weak_magnitude;
	vibration.strong_magnitude = p_strong_magnitude;
	vibration.duration = p_duration;
	vibration.timestamp = OS::get_singleton()->get_ticks_usec();
	joy_vibration[p_device] = vibration;
}

void InputDefault::stop_joy_vibration(int p_device) {
	_THREAD_SAFE_METHOD_
	VibrationInfo vibration;
	vibration.weak_magnitude = 0;
	vibration.strong_magnitude = 0;
	vibration.duration = 0;
	vibration.timestamp = OS::get_singleton()->get_ticks_usec();
	joy_vibration[p_device] = vibration;
}

void InputDefault::vibrate_handheld(int p_duration_ms) {
	OS::get_singleton()->vibrate_handheld(p_duration_ms);
}

void InputDefault::set_gravity(const Vector3 &p_gravity) {

	_THREAD_SAFE_METHOD_

	gravity = p_gravity;
}

void InputDefault::set_accelerometer(const Vector3 &p_accel) {

	_THREAD_SAFE_METHOD_

	accelerometer = p_accel;
}

void InputDefault::set_magnetometer(const Vector3 &p_magnetometer) {

	_THREAD_SAFE_METHOD_

	magnetometer = p_magnetometer;
}

void InputDefault::set_gyroscope(const Vector3 &p_gyroscope) {

	_THREAD_SAFE_METHOD_

	gyroscope = p_gyroscope;
}

void InputDefault::set_main_loop(MainLoop *p_main_loop) {
	main_loop = p_main_loop;
}

void InputDefault::set_mouse_position(const Point2 &p_posf) {

	mouse_speed_track.update(p_posf - mouse_pos);
	mouse_pos = p_posf;
}

Point2 InputDefault::get_mouse_position() const {

	return mouse_pos;
}
Point2 InputDefault::get_last_mouse_speed() const {

	return mouse_speed_track.speed;
}

int InputDefault::get_mouse_button_mask() const {

	return mouse_button_mask; // do not trust OS implementation, should remove it - OS::get_singleton()->get_mouse_button_state();
}

void InputDefault::warp_mouse_position(const Vector2 &p_to) {

	OS::get_singleton()->warp_mouse_position(p_to);
}

Point2i InputDefault::warp_mouse_motion(const Ref<InputEventMouseMotion> &p_motion, const Rect2 &p_rect) {

	// The relative distance reported for the next event after a warp is in the boundaries of the
	// size of the rect on that axis, but it may be greater, in which case there's not problem as fmod()
	// will warp it, but if the pointer has moved in the opposite direction between the pointer relocation
	// and the subsequent event, the reported relative distance will be less than the size of the rect
	// and thus fmod() will be disabled for handling the situation.
	// And due to this mouse warping mechanism being stateless, we need to apply some heuristics to
	// detect the warp: if the relative distance is greater than the half of the size of the relevant rect
	// (checked per each axis), it will be considered as the consequence of a former pointer warp.

	const Point2i rel_sgn(p_motion->get_relative().x >= 0.0f ? 1 : -1, p_motion->get_relative().y >= 0.0 ? 1 : -1);
	const Size2i warp_margin = p_rect.size * 0.5f;
	const Point2i rel_warped(
			Math::fmod(p_motion->get_relative().x + rel_sgn.x * warp_margin.x, p_rect.size.x) - rel_sgn.x * warp_margin.x,
			Math::fmod(p_motion->get_relative().y + rel_sgn.y * warp_margin.y, p_rect.size.y) - rel_sgn.y * warp_margin.y);

	const Point2i pos_local = p_motion->get_global_position() - p_rect.position;
	const Point2i pos_warped(Math::fposmod(pos_local.x, p_rect.size.x), Math::fposmod(pos_local.y, p_rect.size.y));
	if (pos_warped != pos_local) {
		OS::get_singleton()->warp_mouse_position(pos_warped + p_rect.position);
	}

	return rel_warped;
}

void InputDefault::iteration(float p_step) {
}

void InputDefault::action_press(const StringName &p_action, float p_strength) {

	Action action;

	action.physics_frame = Engine::get_singleton()->get_physics_frames();
	action.idle_frame = Engine::get_singleton()->get_idle_frames();
	action.pressed = true;
	action.strength = p_strength;

	action_state[p_action] = action;
}

void InputDefault::action_release(const StringName &p_action) {

	Action action;

	action.physics_frame = Engine::get_singleton()->get_physics_frames();
	action.idle_frame = Engine::get_singleton()->get_idle_frames();
	action.pressed = false;
	action.strength = 0.f;

	action_state[p_action] = action;
}

void InputDefault::set_emulate_touch_from_mouse(bool p_emulate) {

	emulate_touch_from_mouse = p_emulate;
}

bool InputDefault::is_emulating_touch_from_mouse() const {

	return emulate_touch_from_mouse;
}

// Calling this whenever the game window is focused helps unstucking the "touch mouse"
// if the OS or its abstraction class hasn't properly reported that touch pointers raised
void InputDefault::ensure_touch_mouse_raised() {

	if (mouse_from_touch_index != -1) {
		mouse_from_touch_index = -1;

		Ref<InputEventMouseButton> button_event;
		button_event.instance();

		button_event->set_device(InputEvent::DEVICE_ID_TOUCH_MOUSE);
		button_event->set_position(mouse_pos);
		button_event->set_global_position(mouse_pos);
		button_event->set_pressed(false);
		button_event->set_button_index(BUTTON_LEFT);
		button_event->set_button_mask(mouse_button_mask & ~(1 << (BUTTON_LEFT - 1)));

		_parse_input_event_impl(button_event, true);
	}
}

void InputDefault::set_emulate_mouse_from_touch(bool p_emulate) {

	emulate_mouse_from_touch = p_emulate;
}

bool InputDefault::is_emulating_mouse_from_touch() const {

	return emulate_mouse_from_touch;
}

Input::CursorShape InputDefault::get_default_cursor_shape() const {

	return default_shape;
}

void InputDefault::set_default_cursor_shape(CursorShape p_shape) {

	if (default_shape == p_shape)
		return;

	default_shape = p_shape;
	// The default shape is set in Viewport::_gui_input_event. To instantly
	// see the shape in the viewport we need to trigger a mouse motion event.
	Ref<InputEventMouseMotion> mm;
	mm.instance();
	mm->set_position(mouse_pos);
	mm->set_global_position(mouse_pos);
	parse_input_event(mm);
}

Input::CursorShape InputDefault::get_current_cursor_shape() const {

	return (Input::CursorShape)OS::get_singleton()->get_cursor_shape();
}

void InputDefault::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot) {
	if (Engine::get_singleton()->is_editor_hint())
		return;

	OS::get_singleton()->set_custom_mouse_cursor(p_cursor, (OS::CursorShape)p_shape, p_hotspot);
}

void InputDefault::accumulate_input_event(const Ref<InputEvent> &p_event) {
	ERR_FAIL_COND(p_event.is_null());

	if (!use_accumulated_input) {
		parse_input_event(p_event);
		return;
	}
	if (!accumulated_events.empty() && accumulated_events.back()->get()->accumulate(p_event)) {
		return; //event was accumulated, exit
	}

	accumulated_events.push_back(p_event);
}
void InputDefault::flush_accumulated_events() {

	while (accumulated_events.front()) {
		parse_input_event(accumulated_events.front()->get());
		accumulated_events.pop_front();
	}
}

void InputDefault::set_use_accumulated_input(bool p_enable) {

	use_accumulated_input = p_enable;
}

void InputDefault::release_pressed_events() {

	flush_accumulated_events(); // this is needed to release actions strengths

	keys_pressed.clear();
	joy_buttons_pressed.clear();
	_joy_axis.clear();

	for (Map<StringName, InputDefault::Action>::Element *E = action_state.front(); E; E = E->next()) {
		if (E->get().pressed)
			action_release(E->key());
	}
}

InputDefault::InputDefault() {

	use_accumulated_input = true;
	mouse_button_mask = 0;
	emulate_touch_from_mouse = false;
	emulate_mouse_from_touch = false;
	mouse_from_touch_index = -1;
	main_loop = NULL;
	default_shape = CURSOR_ARROW;

	fallback_mapping = -1;

	// Parse default mappings.
	{
		int i = 0;
		while (DefaultControllerMappings::mappings[i]) {
			parse_mapping(DefaultControllerMappings::mappings[i++]);
		}
	}

	// If defined, parse SDL_GAMECONTROLLERCONFIG for possible new mappings/overrides.
	String env_mapping = OS::get_singleton()->get_environment("SDL_GAMECONTROLLERCONFIG");
	if (env_mapping != "") {
		Vector<String> entries = env_mapping.split("\n");
		for (int i = 0; i < entries.size(); i++) {
			if (entries[i] == "")
				continue;
			parse_mapping(entries[i]);
		}
	}
}

void InputDefault::joy_button(int p_device, int p_button, bool p_pressed) {

	_THREAD_SAFE_METHOD_;
	Joypad &joy = joy_names[p_device];
	//printf("got button %i, mapping is %i\n", p_button, joy.mapping);
	if (joy.last_buttons[p_button] == p_pressed) {
		return;
	}
	joy.last_buttons[p_button] = p_pressed;
	if (joy.mapping == -1) {
		_button_event(p_device, p_button, p_pressed);
		return;
	}

	JoyEvent map = _get_mapped_button_event(map_db[joy.mapping], p_button);

	if (map.type == TYPE_BUTTON) {
		//fake additional axis event for triggers
		if (map.index == JOY_L2 || map.index == JOY_R2) {
			float value = p_pressed ? 1.0f : 0.0f;
			int axis = map.index == JOY_L2 ? JOY_ANALOG_L2 : JOY_ANALOG_R2;
			_axis_event(p_device, axis, value);
		}
		_button_event(p_device, map.index, p_pressed);
		return;
	}

	if (map.type == TYPE_AXIS) {
		_axis_event(p_device, map.index, p_pressed ? map.value : 0.0);
	}
	// no event?
}

void InputDefault::joy_axis(int p_device, int p_axis, const JoyAxis &p_value) {

	_THREAD_SAFE_METHOD_;

	ERR_FAIL_INDEX(p_axis, JOY_AXIS_MAX);

	Joypad &joy = joy_names[p_device];

	if (joy.last_axis[p_axis] == p_value.value) {
		return;
	}

	//when changing direction quickly, insert fake event to release pending inputmap actions
	float last = joy.last_axis[p_axis];
	if (p_value.min == 0 && (last < 0.25 || last > 0.75) && (last - 0.5) * (p_value.value - 0.5) < 0) {
		JoyAxis jx;
		jx.min = p_value.min;
		jx.value = p_value.value < 0.5 ? 0.6 : 0.4;
		joy_axis(p_device, p_axis, jx);
	} else if (ABS(last) > 0.5 && last * p_value.value < 0) {
		JoyAxis jx;
		jx.min = p_value.min;
		jx.value = p_value.value < 0 ? 0.1 : -0.1;
		joy_axis(p_device, p_axis, jx);
	}

	joy.last_axis[p_axis] = p_value.value;
	float val = p_value.min == 0 ? -1.0f + 2.0f * p_value.value : p_value.value;

	if (joy.mapping == -1) {
		_axis_event(p_device, p_axis, val);
		return;
	};

	JoyEvent map = _get_mapped_axis_event(map_db[joy.mapping], p_axis, val);

	if (map.type == TYPE_BUTTON) {
		//send axis event for triggers
		if (map.index == JOY_L2 || map.index == JOY_R2) {
			float value = p_value.min == 0 ? p_value.value : 0.5f + p_value.value / 2.0f;
			int axis = map.index == JOY_L2 ? JOY_ANALOG_L2 : JOY_ANALOG_R2;
			_axis_event(p_device, axis, value);
		}

		bool pressed = map.value > 0.5;
		if (pressed == joy_buttons_pressed.has(_combine_device(map.index, p_device))) {
			// Button already pressed or released; so ignore.
			return;
		}
		_button_event(p_device, map.index, pressed);

		// Ensure opposite D-Pad button is also released.
		switch (map.index) {
			case JOY_DPAD_UP:
				if (joy_buttons_pressed.has(_combine_device(JOY_DPAD_DOWN, p_device))) {
					_button_event(p_device, JOY_DPAD_DOWN, false);
				}
				break;
			case JOY_DPAD_DOWN:
				if (joy_buttons_pressed.has(_combine_device(JOY_DPAD_UP, p_device))) {
					_button_event(p_device, JOY_DPAD_UP, false);
				}
				break;
			case JOY_DPAD_LEFT:
				if (joy_buttons_pressed.has(_combine_device(JOY_DPAD_RIGHT, p_device))) {
					_button_event(p_device, JOY_DPAD_RIGHT, false);
				}
				break;
			case JOY_DPAD_RIGHT:
				if (joy_buttons_pressed.has(_combine_device(JOY_DPAD_LEFT, p_device))) {
					_button_event(p_device, JOY_DPAD_LEFT, false);
				}
				break;
			default:
				// Nothing to do.
				break;
		}
		return;
	}

	if (map.type == TYPE_AXIS) {

		_axis_event(p_device, map.index, val);
		return;
	}
	//printf("invalid mapping\n");
}

void InputDefault::joy_hat(int p_device, int p_val) {

	_THREAD_SAFE_METHOD_;
	const Joypad &joy = joy_names[p_device];

	JoyEvent map[HAT_MAX];

	map[HAT_UP].type = TYPE_BUTTON;
	map[HAT_UP].index = JOY_DPAD_UP;
	map[HAT_UP].value = 0;

	map[HAT_RIGHT].type = TYPE_BUTTON;
	map[HAT_RIGHT].index = JOY_DPAD_RIGHT;
	map[HAT_RIGHT].value = 0;

	map[HAT_DOWN].type = TYPE_BUTTON;
	map[HAT_DOWN].index = JOY_DPAD_DOWN;
	map[HAT_DOWN].value = 0;

	map[HAT_LEFT].type = TYPE_BUTTON;
	map[HAT_LEFT].index = JOY_DPAD_LEFT;
	map[HAT_LEFT].value = 0;

	if (joy.mapping != -1) {
		_get_mapped_hat_events(map_db[joy.mapping], 0, map);
	};

	int cur_val = joy_names[p_device].hat_current;

	for (int hat_direction = 0, hat_mask = 1; hat_direction < HAT_MAX; hat_direction++, hat_mask <<= 1) {
		if ((p_val & hat_mask) != (cur_val & hat_mask)) {
			if (map[hat_direction].type == TYPE_BUTTON) {
				_button_event(p_device, map[hat_direction].index, p_val & hat_mask);
			}
			if (map[hat_direction].type == TYPE_AXIS) {
				_axis_event(p_device, map[hat_direction].index, (p_val & hat_mask) ? map[hat_direction].value : 0.0);
			}
		}
	}

	joy_names[p_device].hat_current = p_val;
}

void InputDefault::_button_event(int p_device, int p_index, bool p_pressed) {

	Ref<InputEventJoypadButton> ievent;
	ievent.instance();
	ievent->set_device(p_device);
	ievent->set_button_index(p_index);
	ievent->set_pressed(p_pressed);

	parse_input_event(ievent);
}

void InputDefault::_axis_event(int p_device, int p_axis, float p_value) {

	Ref<InputEventJoypadMotion> ievent;
	ievent.instance();
	ievent->set_device(p_device);
	ievent->set_axis(p_axis);
	ievent->set_axis_value(p_value);

	parse_input_event(ievent);
};

InputDefault::JoyEvent InputDefault::_get_mapped_button_event(const JoyDeviceMapping &mapping, int p_button) {

	JoyEvent event;
	event.type = TYPE_MAX;

	for (int i = 0; i < mapping.bindings.size(); i++) {
		const JoyBinding binding = mapping.bindings[i];
		if (binding.inputType == TYPE_BUTTON && binding.input.button == p_button) {
			event.type = binding.outputType;
			switch (binding.outputType) {
				case TYPE_BUTTON:
					event.index = binding.output.button;
					return event;
				case TYPE_AXIS:
					event.index = binding.output.axis.axis;
					switch (binding.output.axis.range) {
						case POSITIVE_HALF_AXIS:
							event.value = 1;
							break;
						case NEGATIVE_HALF_AXIS:
							event.value = -1;
							break;
						case FULL_AXIS:
							// It doesn't make sense for a button to map to a full axis,
							// but keeping as a default for a trigger with a positive half-axis.
							event.value = 1;
							break;
					}
					return event;
				default:
					ERR_PRINT_ONCE("Joypad button mapping error.");
			}
		}
	}
	return event;
}

InputDefault::JoyEvent InputDefault::_get_mapped_axis_event(const JoyDeviceMapping &mapping, int p_axis, float p_value) {

	JoyEvent event;
	event.type = TYPE_MAX;

	for (int i = 0; i < mapping.bindings.size(); i++) {
		const JoyBinding binding = mapping.bindings[i];
		if (binding.inputType == TYPE_AXIS && binding.input.axis.axis == p_axis) {
			float value = p_value;
			if (binding.input.axis.invert)
				value = -value;
			if (binding.input.axis.range == FULL_AXIS ||
					(binding.input.axis.range == POSITIVE_HALF_AXIS && value > 0) ||
					(binding.input.axis.range == NEGATIVE_HALF_AXIS && value < 0)) {
				event.type = binding.outputType;
				float shifted_positive_value = 0;
				switch (binding.input.axis.range) {
					case POSITIVE_HALF_AXIS:
						shifted_positive_value = value;
						break;
					case NEGATIVE_HALF_AXIS:
						shifted_positive_value = value + 1;
						break;
					case FULL_AXIS:
						shifted_positive_value = (value + 1) / 2;
						break;
				}
				switch (binding.outputType) {
					case TYPE_BUTTON:
						event.index = binding.output.button;
						switch (binding.input.axis.range) {
							case POSITIVE_HALF_AXIS:
								event.value = shifted_positive_value;
								break;
							case NEGATIVE_HALF_AXIS:
								event.value = 1 - shifted_positive_value;
								break;
							case FULL_AXIS:
								// It doesn't make sense for a full axis to map to a button,
								// but keeping as a default for a trigger with a positive half-axis.
								event.value = (shifted_positive_value * 2) - 1;
								break;
						}
						return event;
					case TYPE_AXIS:
						event.index = binding.output.axis.axis;
						event.value = value;
						if (binding.output.axis.range != binding.input.axis.range) {
							switch (binding.output.axis.range) {
								case POSITIVE_HALF_AXIS:
									event.value = shifted_positive_value;
									break;
								case NEGATIVE_HALF_AXIS:
									event.value = shifted_positive_value - 1;
									break;
								case FULL_AXIS:
									event.value = (shifted_positive_value * 2) - 1;
									break;
							}
						}
						return event;
					default:
						ERR_PRINT_ONCE("Joypad axis mapping error.");
				}
			}
		}
	}
	return event;
}

void InputDefault::_get_mapped_hat_events(const JoyDeviceMapping &mapping, int p_hat, JoyEvent r_events[]) {

	for (int i = 0; i < mapping.bindings.size(); i++) {
		const JoyBinding binding = mapping.bindings[i];
		if (binding.inputType == TYPE_HAT && binding.input.hat.hat == p_hat) {

			int hat_direction;
			switch (binding.input.hat.hat_mask) {
				case HAT_MASK_UP:
					hat_direction = HAT_UP;
					break;
				case HAT_MASK_RIGHT:
					hat_direction = HAT_RIGHT;
					break;
				case HAT_MASK_DOWN:
					hat_direction = HAT_DOWN;
					break;
				case HAT_MASK_LEFT:
					hat_direction = HAT_LEFT;
					break;
				default:
					ERR_PRINT_ONCE("Joypad button mapping error.");
					continue;
			}

			r_events[hat_direction].type = binding.outputType;
			switch (binding.outputType) {
				case TYPE_BUTTON:
					r_events[hat_direction].index = binding.output.button;
					break;
				case TYPE_AXIS:
					r_events[hat_direction].index = binding.output.axis.axis;
					switch (binding.output.axis.range) {
						case POSITIVE_HALF_AXIS:
							r_events[hat_direction].value = 1;
							break;
						case NEGATIVE_HALF_AXIS:
							r_events[hat_direction].value = -1;
							break;
						case FULL_AXIS:
							// It doesn't make sense for a hat direction to map to a full axis,
							// but keeping as a default for a trigger with a positive half-axis.
							r_events[hat_direction].value = 1;
							break;
					}
					break;
				default:
					ERR_PRINT_ONCE("Joypad button mapping error.");
			}
		}
	}
}

// string names of the SDL buttons in the same order as input_event.h godot buttons
static const char *_joy_buttons[] = { "a", "b", "x", "y", "leftshoulder", "rightshoulder", "lefttrigger", "righttrigger", "leftstick", "rightstick", "back", "start", "dpup", "dpdown", "dpleft", "dpright", "guide", nullptr };
static const char *_joy_axes[] = { "leftx", "lefty", "rightx", "righty", nullptr };

JoystickList InputDefault::_get_output_button(String output) {

	for (int i = 0; _joy_buttons[i]; i++) {
		if (output == _joy_buttons[i])
			return JoystickList(i);
	}
	return JoystickList::JOY_INVALID_OPTION;
}

JoystickList InputDefault::_get_output_axis(String output) {

	for (int i = 0; _joy_axes[i]; i++) {
		if (output == _joy_axes[i])
			return JoystickList(i);
	}
	return JoystickList::JOY_INVALID_OPTION;
}

void InputDefault::parse_mapping(String p_mapping) {

	_THREAD_SAFE_METHOD_;
	JoyDeviceMapping mapping;

	Vector<String> entry = p_mapping.split(",");
	if (entry.size() < 2) {
		return;
	}

	CharString uid;
	uid.resize(17);

	mapping.uid = entry[0];
	mapping.name = entry[1];

	int idx = 1;
	while (++idx < entry.size()) {

		if (entry[idx] == "")
			continue;

		String output = entry[idx].get_slice(":", 0).replace(" ", "");
		String input = entry[idx].get_slice(":", 1).replace(" ", "");
		ERR_CONTINUE_MSG(output.length() < 1 || input.length() < 2,
				String(entry[idx] + "\nInvalid device mapping entry: " + entry[idx]));

		if (output == "platform" || output == "hint")
			continue;

		JoyAxisRange output_range = FULL_AXIS;
		if (output[0] == '+' || output[0] == '-') {
			ERR_CONTINUE_MSG(output.length() < 2, String(entry[idx] + "\nInvalid output: " + entry[idx]));
			if (output[0] == '+')
				output_range = POSITIVE_HALF_AXIS;
			else if (output[0] == '-')
				output_range = NEGATIVE_HALF_AXIS;
			output = output.right(1);
		}

		JoyAxisRange input_range = FULL_AXIS;
		if (input[0] == '+') {
			input_range = POSITIVE_HALF_AXIS;
			input = input.right(1);
		} else if (input[0] == '-') {
			input_range = NEGATIVE_HALF_AXIS;
			input = input.right(1);
		}
		bool invert_axis = false;
		if (input[input.length() - 1] == '~') {
			invert_axis = true;
			input = input.left(input.length() - 1);
		}

		JoystickList output_button = _get_output_button(output);
		JoystickList output_axis = _get_output_axis(output);
		ERR_CONTINUE_MSG(output_button == JOY_INVALID_OPTION && output_axis == JOY_INVALID_OPTION,
				String(entry[idx] + "\nUnrecognised output string: " + output));
		ERR_CONTINUE_MSG(output_button != JOY_INVALID_OPTION && output_axis != JOY_INVALID_OPTION,
				String("BUG: Output string matched both button and axis: " + output));

		JoyBinding binding;
		if (output_button != JOY_INVALID_OPTION) {
			binding.outputType = TYPE_BUTTON;
			binding.output.button = output_button;
		} else if (output_axis != JOY_INVALID_OPTION) {
			binding.outputType = TYPE_AXIS;
			binding.output.axis.axis = output_axis;
			binding.output.axis.range = output_range;
		}

		switch (input[0]) {
			case 'b':
				binding.inputType = TYPE_BUTTON;
				binding.input.button = input.right(1).to_int();
				break;
			case 'a':
				binding.inputType = TYPE_AXIS;
				binding.input.axis.axis = input.right(1).to_int();
				binding.input.axis.range = input_range;
				binding.input.axis.invert = invert_axis;
				break;
			case 'h':
				ERR_CONTINUE_MSG(input.length() != 4 || input[2] != '.',
						String(entry[idx] + "\nInvalid hat input: " + input));
				binding.inputType = TYPE_HAT;
				binding.input.hat.hat = input.substr(1, 1).to_int();
				binding.input.hat.hat_mask = static_cast<HatMask>(input.right(3).to_int());
				break;
			default:
				ERR_CONTINUE_MSG(true, String(entry[idx] + "\nUnrecognised input string: " + input));
		}

		mapping.bindings.push_back(binding);
	};

	map_db.push_back(mapping);
};

void InputDefault::add_joy_mapping(String p_mapping, bool p_update_existing) {
	parse_mapping(p_mapping);
	if (p_update_existing) {
		Vector<String> entry = p_mapping.split(",");
		String uid = entry[0];
		for (int i = 0; i < joy_names.size(); i++) {
			if (uid == joy_names[i].uid) {
				joy_names[i].mapping = map_db.size() - 1;
			}
		}
	}
}

void InputDefault::remove_joy_mapping(String p_guid) {
	for (int i = map_db.size() - 1; i >= 0; i--) {
		if (p_guid == map_db[i].uid) {
			map_db.remove(i);
		}
	}
	for (int i = 0; i < joy_names.size(); i++) {
		if (joy_names[i].uid == p_guid) {
			joy_names[i].mapping = -1;
		}
	}
}

void InputDefault::set_fallback_mapping(String p_guid) {

	for (int i = 0; i < map_db.size(); i++) {
		if (map_db[i].uid == p_guid) {
			fallback_mapping = i;
			return;
		}
	}
}

//Defaults to simple implementation for platforms with a fixed gamepad layout, like consoles.
bool InputDefault::is_joy_known(int p_device) {

	return OS::get_singleton()->is_joy_known(p_device);
}

String InputDefault::get_joy_guid(int p_device) const {
	return OS::get_singleton()->get_joy_guid(p_device);
}

//platforms that use the remapping system can override and call to these ones
bool InputDefault::is_joy_mapped(int p_device) {
	int mapping = joy_names[p_device].mapping;
	return mapping != -1 ? (mapping != fallback_mapping) : false;
}

String InputDefault::get_joy_guid_remapped(int p_device) const {
	ERR_FAIL_COND_V(!joy_names.has(p_device), "");
	return joy_names[p_device].uid;
}

Array InputDefault::get_connected_joypads() {
	Array ret;
	Map<int, Joypad>::Element *elem = joy_names.front();
	while (elem) {
		if (elem->get().connected) {
			ret.push_back(elem->key());
		}
		elem = elem->next();
	}
	return ret;
}

static const char *_buttons[JOY_BUTTON_MAX] = {
	"Face Button Bottom",
	"Face Button Right",
	"Face Button Left",
	"Face Button Top",
	"L",
	"R",
	"L2",
	"R2",
	"L3",
	"R3",
	"Select",
	"Start",
	"DPAD Up",
	"DPAD Down",
	"DPAD Left",
	"DPAD Right"
};

static const char *_axes[JOY_AXIS_MAX] = {
	"Left Stick X",
	"Left Stick Y",
	"Right Stick X",
	"Right Stick Y",
	"",
	"",
	"L2",
	"R2",
	"",
	""
};

String InputDefault::get_joy_button_string(int p_button) {
	ERR_FAIL_INDEX_V(p_button, JOY_BUTTON_MAX, "");
	return _buttons[p_button];
}

int InputDefault::get_joy_button_index_from_string(String p_button) {
	for (int i = 0; i < JOY_BUTTON_MAX; i++) {
		if (p_button == _buttons[i]) {
			return i;
		}
	}
	ERR_FAIL_V(-1);
}

int InputDefault::get_unused_joy_id() {
	for (int i = 0; i < JOYPADS_MAX; i++) {
		if (!joy_names.has(i) || !joy_names[i].connected) {
			return i;
		}
	}
	return -1;
}

String InputDefault::get_joy_axis_string(int p_axis) {
	ERR_FAIL_INDEX_V(p_axis, JOY_AXIS_MAX, "");
	return _axes[p_axis];
}

int InputDefault::get_joy_axis_index_from_string(String p_axis) {
	for (int i = 0; i < JOY_AXIS_MAX; i++) {
		if (p_axis == _axes[i]) {
			return i;
		}
	}
	ERR_FAIL_V(-1);
}
