/*************************************************************************/
/*  visibility_notifier_3d.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "visibility_notifier_3d.h"

#include "core/config/engine.h"
#include "scene/3d/camera_3d.h"
#include "scene/3d/physics_body_3d.h"
#include "scene/animation/animation_player.h"
#include "scene/scene_string_names.h"

void VisibilityNotifier3D::_enter_camera(Camera3D *p_camera) {
	ERR_FAIL_COND(cameras.has(p_camera));
	cameras.insert(p_camera);
	if (cameras.size() == 1) {
		emit_signal(SceneStringNames::get_singleton()->screen_entered);
		_screen_enter();
	}

	emit_signal(SceneStringNames::get_singleton()->camera_entered, p_camera);
}

void VisibilityNotifier3D::_exit_camera(Camera3D *p_camera) {
	ERR_FAIL_COND(!cameras.has(p_camera));
	cameras.erase(p_camera);

	emit_signal(SceneStringNames::get_singleton()->camera_exited, p_camera);
	if (cameras.size() == 0) {
		emit_signal(SceneStringNames::get_singleton()->screen_exited);

		_screen_exit();
	}
}

void VisibilityNotifier3D::set_aabb(const AABB &p_aabb) {
	if (aabb == p_aabb) {
		return;
	}
	aabb = p_aabb;

	if (is_inside_world()) {
		get_world_3d()->_update_notifier(this, get_global_transform().xform(aabb));
	}

	update_gizmo();
}

AABB VisibilityNotifier3D::get_aabb() const {
	return aabb;
}

void VisibilityNotifier3D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_WORLD: {
			world = get_world_3d();
			ERR_FAIL_COND(!world.is_valid());
			world->_register_notifier(this, get_global_transform().xform(aabb));
		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {
			world->_update_notifier(this, get_global_transform().xform(aabb));
		} break;
		case NOTIFICATION_EXIT_WORLD: {
			ERR_FAIL_COND(!world.is_valid());
			world->_remove_notifier(this);
		} break;
	}
}

bool VisibilityNotifier3D::is_on_screen() const {
	return cameras.size() != 0;
}

void VisibilityNotifier3D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_aabb", "rect"), &VisibilityNotifier3D::set_aabb);
	ClassDB::bind_method(D_METHOD("get_aabb"), &VisibilityNotifier3D::get_aabb);
	ClassDB::bind_method(D_METHOD("is_on_screen"), &VisibilityNotifier3D::is_on_screen);

	ADD_PROPERTY(PropertyInfo(Variant::AABB, "aabb"), "set_aabb", "get_aabb");

	ADD_SIGNAL(MethodInfo("camera_entered", PropertyInfo(Variant::OBJECT, "camera", PROPERTY_HINT_RESOURCE_TYPE, "Camera3D")));
	ADD_SIGNAL(MethodInfo("camera_exited", PropertyInfo(Variant::OBJECT, "camera", PROPERTY_HINT_RESOURCE_TYPE, "Camera3D")));
	ADD_SIGNAL(MethodInfo("screen_entered"));
	ADD_SIGNAL(MethodInfo("screen_exited"));
}

VisibilityNotifier3D::VisibilityNotifier3D() {
	set_notify_transform(true);
}

//////////////////////////////////////

void VisibilityEnabler3D::_screen_enter() {
	for (Map<Node *, Variant>::Element *E = nodes.front(); E; E = E->next()) {
		_change_node_state(E->key(), true);
	}

	visible = true;
}

void VisibilityEnabler3D::_screen_exit() {
	for (Map<Node *, Variant>::Element *E = nodes.front(); E; E = E->next()) {
		_change_node_state(E->key(), false);
	}

	visible = false;
}

void VisibilityEnabler3D::_find_nodes(Node *p_node) {
	bool add = false;
	Variant meta;

	{
		RigidBody3D *rb = Object::cast_to<RigidBody3D>(p_node);
		if (rb && ((rb->get_mode() == RigidBody3D::MODE_CHARACTER || rb->get_mode() == RigidBody3D::MODE_RIGID))) {
			add = true;
			meta = rb->get_mode();
		}
	}

	{
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);
		if (ap) {
			add = true;
		}
	}

	if (add) {
		p_node->connect(SceneStringNames::get_singleton()->tree_exiting, callable_mp(this, &VisibilityEnabler3D::_node_removed), varray(p_node), CONNECT_ONESHOT);
		nodes[p_node] = meta;
		_change_node_state(p_node, false);
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *c = p_node->get_child(i);
		if (c->get_filename() != String()) {
			continue; //skip, instance
		}

		_find_nodes(c);
	}
}

void VisibilityEnabler3D::_notification(int p_what) {
	if (p_what == NOTIFICATION_ENTER_TREE) {
		if (Engine::get_singleton()->is_editor_hint()) {
			return;
		}

		Node *from = this;
		//find where current scene starts
		while (from->get_parent() && from->get_filename() == String()) {
			from = from->get_parent();
		}

		_find_nodes(from);
	}

	if (p_what == NOTIFICATION_EXIT_TREE) {
		if (Engine::get_singleton()->is_editor_hint()) {
			return;
		}

		for (Map<Node *, Variant>::Element *E = nodes.front(); E; E = E->next()) {
			if (!visible) {
				_change_node_state(E->key(), true);
			}
			E->key()->disconnect(SceneStringNames::get_singleton()->tree_exiting, callable_mp(this, &VisibilityEnabler3D::_node_removed));
		}

		nodes.clear();
	}
}

void VisibilityEnabler3D::_change_node_state(Node *p_node, bool p_enabled) {
	ERR_FAIL_COND(!nodes.has(p_node));

	if (enabler[ENABLER_FREEZE_BODIES]) {
		RigidBody3D *rb = Object::cast_to<RigidBody3D>(p_node);
		if (rb) {
			rb->set_sleeping(!p_enabled);
		}
	}

	if (enabler[ENABLER_PAUSE_ANIMATIONS]) {
		AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(p_node);

		if (ap) {
			ap->set_active(p_enabled);
		}
	}
}

void VisibilityEnabler3D::_node_removed(Node *p_node) {
	if (!visible) {
		_change_node_state(p_node, true);
	}
	nodes.erase(p_node);
}

void VisibilityEnabler3D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_enabler", "enabler", "enabled"), &VisibilityEnabler3D::set_enabler);
	ClassDB::bind_method(D_METHOD("is_enabler_enabled", "enabler"), &VisibilityEnabler3D::is_enabler_enabled);

	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "pause_animations"), "set_enabler", "is_enabler_enabled", ENABLER_PAUSE_ANIMATIONS);
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "freeze_bodies"), "set_enabler", "is_enabler_enabled", ENABLER_FREEZE_BODIES);

	BIND_ENUM_CONSTANT(ENABLER_PAUSE_ANIMATIONS);
	BIND_ENUM_CONSTANT(ENABLER_FREEZE_BODIES);
	BIND_ENUM_CONSTANT(ENABLER_MAX);
}

void VisibilityEnabler3D::set_enabler(Enabler p_enabler, bool p_enable) {
	ERR_FAIL_INDEX(p_enabler, ENABLER_MAX);
	enabler[p_enabler] = p_enable;
}

bool VisibilityEnabler3D::is_enabler_enabled(Enabler p_enabler) const {
	ERR_FAIL_INDEX_V(p_enabler, ENABLER_MAX, false);
	return enabler[p_enabler];
}

VisibilityEnabler3D::VisibilityEnabler3D() {
	for (int i = 0; i < ENABLER_MAX; i++) {
		enabler[i] = true;
	}
}