/*************************************************************************/
/*  visibility_notifier_2d.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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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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#include "visibility_notifier_2d.h"

#include "core/config/engine.h"
#include "gpu_particles_2d.h"
#include "scene/2d/animated_sprite_2d.h"
#include "scene/2d/physics_body_2d.h"
#include "scene/animation/animation_player.h"
#include "scene/main/window.h"
#include "scene/scene_string_names.h"

#ifdef TOOLS_ENABLED
Rect2 VisibilityNotifier2D::_edit_get_rect() const {
	return rect;
}

bool VisibilityNotifier2D::_edit_use_rect() const {
	return true;
}
#endif

void VisibilityNotifier2D::_enter_viewport(Viewport *p_viewport) {
	ERR_FAIL_COND(viewports.has(p_viewport));
	viewports.insert(p_viewport);

	if (is_inside_tree() && Engine::get_singleton()->is_editor_hint()) {
		return;
	}

	if (viewports.size() == 1) {
		emit_signal(SceneStringNames::get_singleton()->screen_entered);

		_screen_enter();
	}
	emit_signal(SceneStringNames::get_singleton()->viewport_entered, p_viewport);
}

void VisibilityNotifier2D::_exit_viewport(Viewport *p_viewport) {
	ERR_FAIL_COND(!viewports.has(p_viewport));
	viewports.erase(p_viewport);

	if (is_inside_tree() && Engine::get_singleton()->is_editor_hint()) {
		return;
	}

	emit_signal(SceneStringNames::get_singleton()->viewport_exited, p_viewport);
	if (viewports.size() == 0) {
		emit_signal(SceneStringNames::get_singleton()->screen_exited);

		_screen_exit();
	}
}

void VisibilityNotifier2D::set_rect(const Rect2 &p_rect) {
	rect = p_rect;
	if (is_inside_tree()) {
		get_world_2d()->_update_notifier(this, get_global_transform().xform(rect));
		if (Engine::get_singleton()->is_editor_hint()) {
			update();
			item_rect_changed();
		}
	}
}

Rect2 VisibilityNotifier2D::get_rect() const {
	return rect;
}

void VisibilityNotifier2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			//get_world_2d()->
			get_world_2d()->_register_notifier(this, get_global_transform().xform(rect));
		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {
			//get_world_2d()->
			get_world_2d()->_update_notifier(this, get_global_transform().xform(rect));
		} break;
		case NOTIFICATION_DRAW: {
			if (Engine::get_singleton()->is_editor_hint()) {
				draw_rect(rect, Color(1, 0.5, 1, 0.2));
			}
		} break;
		case NOTIFICATION_EXIT_TREE: {
			get_world_2d()->_remove_notifier(this);
		} break;
	}
}

bool VisibilityNotifier2D::is_on_screen() const {
	return viewports.size() > 0;
}

void VisibilityNotifier2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_rect", "rect"), &VisibilityNotifier2D::set_rect);
	ClassDB::bind_method(D_METHOD("get_rect"), &VisibilityNotifier2D::get_rect);
	ClassDB::bind_method(D_METHOD("is_on_screen"), &VisibilityNotifier2D::is_on_screen);

	ADD_PROPERTY(PropertyInfo(Variant::RECT2, "rect"), "set_rect", "get_rect");

	ADD_SIGNAL(MethodInfo("viewport_entered", PropertyInfo(Variant::OBJECT, "viewport", PROPERTY_HINT_RESOURCE_TYPE, "Viewport")));
	ADD_SIGNAL(MethodInfo("viewport_exited", PropertyInfo(Variant::OBJECT, "viewport", PROPERTY_HINT_RESOURCE_TYPE, "Viewport")));
	ADD_SIGNAL(MethodInfo("screen_entered"));
	ADD_SIGNAL(MethodInfo("screen_exited"));
}

VisibilityNotifier2D::VisibilityNotifier2D() {
	rect = Rect2(-10, -10, 20, 20);
	set_notify_transform(true);
}

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

void VisibilityEnabler2D::_screen_enter() {
	for (Map<Node *, Variant>::Element *E = nodes.front(); E; E = E->next()) {
		_change_node_state(E->key(), true);
	}

	if (enabler[ENABLER_PARENT_PHYSICS_PROCESS] && get_parent()) {
		get_parent()->set_physics_process(true);
	}
	if (enabler[ENABLER_PARENT_PROCESS] && get_parent()) {
		get_parent()->set_process(true);
	}

	visible = true;
}

void VisibilityEnabler2D::_screen_exit() {
	for (Map<Node *, Variant>::Element *E = nodes.front(); E; E = E->next()) {
		_change_node_state(E->key(), false);
	}

	if (enabler[ENABLER_PARENT_PHYSICS_PROCESS] && get_parent()) {
		get_parent()->set_physics_process(false);
	}
	if (enabler[ENABLER_PARENT_PROCESS] && get_parent()) {
		get_parent()->set_process(false);
	}

	visible = false;
}

void VisibilityEnabler2D::_find_nodes(Node *p_node) {
	bool add = false;
	Variant meta;

	{
		RigidBody2D *rb2d = Object::cast_to<RigidBody2D>(p_node);
		if (rb2d && ((rb2d->get_mode() == RigidBody2D::MODE_CHARACTER || rb2d->get_mode() == RigidBody2D::MODE_RIGID))) {
			add = true;
			meta = rb2d->get_mode();
		}
	}

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

	{
		AnimatedSprite2D *as = Object::cast_to<AnimatedSprite2D>(p_node);
		if (as) {
			add = true;
		}
	}

	{
		GPUParticles2D *ps = Object::cast_to<GPUParticles2D>(p_node);
		if (ps) {
			add = true;
		}
	}

	if (add) {
		p_node->connect(SceneStringNames::get_singleton()->tree_exiting, callable_mp(this, &VisibilityEnabler2D::_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 VisibilityEnabler2D::_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);

		// We need to defer the call of set_process and set_physics_process,
		// otherwise they are overwritten inside NOTIFICATION_READY.
		// We can't use call_deferred, because it happens after a physics frame.
		// The ready signal works as it's emitted immediately after NOTIFICATION_READY.

		if (enabler[ENABLER_PARENT_PHYSICS_PROCESS] && get_parent()) {
			get_parent()->connect(SceneStringNames::get_singleton()->ready,
					callable_mp(get_parent(), &Node::set_physics_process), varray(false), CONNECT_ONESHOT);
		}
		if (enabler[ENABLER_PARENT_PROCESS] && get_parent()) {
			get_parent()->connect(SceneStringNames::get_singleton()->ready,
					callable_mp(get_parent(), &Node::set_process), varray(false), CONNECT_ONESHOT);
		}
	}

	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, &VisibilityEnabler2D::_node_removed));
		}

		nodes.clear();
	}
}

void VisibilityEnabler2D::_change_node_state(Node *p_node, bool p_enabled) {
	ERR_FAIL_COND(!nodes.has(p_node));

	if (enabler[ENABLER_FREEZE_BODIES]) {
		RigidBody2D *rb = Object::cast_to<RigidBody2D>(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);
		}
	}

	if (enabler[ENABLER_PAUSE_ANIMATED_SPRITES]) {
		AnimatedSprite2D *as = Object::cast_to<AnimatedSprite2D>(p_node);

		if (as) {
			if (p_enabled) {
				as->play();
			} else {
				as->stop();
			}
		}
	}

	if (enabler[ENABLER_PAUSE_PARTICLES]) {
		GPUParticles2D *ps = Object::cast_to<GPUParticles2D>(p_node);

		if (ps) {
			ps->set_emitting(p_enabled);
		}
	}
}

void VisibilityEnabler2D::_node_removed(Node *p_node) {
	if (!visible) {
		_change_node_state(p_node, true);
	}
	nodes.erase(p_node);
}

String VisibilityEnabler2D::get_configuration_warning() const {
	String warning = VisibilityNotifier2D::get_configuration_warning();

#ifdef TOOLS_ENABLED
	if (is_inside_tree() && get_parent() && (get_parent()->get_filename() == String() && get_parent() != get_tree()->get_edited_scene_root())) {
		if (!warning.is_empty()) {
			warning += "\n\n";
		}
		warning += TTR("VisibilityEnabler2D works best when used with the edited scene root directly as parent.");
	}
#endif
	return warning;
}

void VisibilityEnabler2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_enabler", "enabler", "enabled"), &VisibilityEnabler2D::set_enabler);
	ClassDB::bind_method(D_METHOD("is_enabler_enabled", "enabler"), &VisibilityEnabler2D::is_enabler_enabled);
	ClassDB::bind_method(D_METHOD("_node_removed"), &VisibilityEnabler2D::_node_removed);

	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);
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "pause_particles"), "set_enabler", "is_enabler_enabled", ENABLER_PAUSE_PARTICLES);
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "pause_animated_sprites"), "set_enabler", "is_enabler_enabled", ENABLER_PAUSE_ANIMATED_SPRITES);
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "process_parent"), "set_enabler", "is_enabler_enabled", ENABLER_PARENT_PROCESS);
	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "physics_process_parent"), "set_enabler", "is_enabler_enabled", ENABLER_PARENT_PHYSICS_PROCESS);

	BIND_ENUM_CONSTANT(ENABLER_PAUSE_ANIMATIONS);
	BIND_ENUM_CONSTANT(ENABLER_FREEZE_BODIES);
	BIND_ENUM_CONSTANT(ENABLER_PAUSE_PARTICLES);
	BIND_ENUM_CONSTANT(ENABLER_PARENT_PROCESS);
	BIND_ENUM_CONSTANT(ENABLER_PARENT_PHYSICS_PROCESS);
	BIND_ENUM_CONSTANT(ENABLER_PAUSE_ANIMATED_SPRITES);
	BIND_ENUM_CONSTANT(ENABLER_MAX);
}

void VisibilityEnabler2D::set_enabler(Enabler p_enabler, bool p_enable) {
	ERR_FAIL_INDEX(p_enabler, ENABLER_MAX);
	enabler[p_enabler] = p_enable;
}

bool VisibilityEnabler2D::is_enabler_enabled(Enabler p_enabler) const {
	ERR_FAIL_INDEX_V(p_enabler, ENABLER_MAX, false);
	return enabler[p_enabler];
}

VisibilityEnabler2D::VisibilityEnabler2D() {
	for (int i = 0; i < ENABLER_MAX; i++) {
		enabler[i] = true;
	}
	enabler[ENABLER_PARENT_PROCESS] = false;
	enabler[ENABLER_PARENT_PHYSICS_PROCESS] = false;
}