/*************************************************************************/
/*  visibility_notifier_2d.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* 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:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* 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_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::_visibility_enter() {
	if (!is_inside_tree() || Engine::get_singleton()->is_editor_hint()) {
		return;
	}

	on_screen = true;
	emit_signal(SceneStringNames::get_singleton()->screen_entered);
	_screen_enter();
}
void VisibilityNotifier2D::_visibility_exit() {
	if (!is_inside_tree() || Engine::get_singleton()->is_editor_hint()) {
		return;
	}

	on_screen = false;
	emit_signal(SceneStringNames::get_singleton()->screen_exited);
	_screen_exit();
}

void VisibilityNotifier2D::set_rect(const Rect2 &p_rect) {
	rect = p_rect;
	if (is_inside_tree()) {
		RS::get_singleton()->canvas_item_set_visibility_notifier(get_canvas_item(), true, rect, callable_mp(this, &VisibilityNotifier2D::_visibility_enter), callable_mp(this, &VisibilityNotifier2D::_visibility_exit));
	}
}

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

void VisibilityNotifier2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			//get_world_2d()->
			on_screen = false;
			RS::get_singleton()->canvas_item_set_visibility_notifier(get_canvas_item(), true, rect, callable_mp(this, &VisibilityNotifier2D::_visibility_enter), callable_mp(this, &VisibilityNotifier2D::_visibility_exit));
		} 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: {
			on_screen = false;
			RS::get_singleton()->canvas_item_set_visibility_notifier(get_canvas_item(), false, Rect2(), Callable(), Callable());
		} break;
	}
}

bool VisibilityNotifier2D::is_on_screen() const {
	return on_screen;
}

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("screen_entered"));
	ADD_SIGNAL(MethodInfo("screen_exited"));
}

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

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

void VisibilityEnabler2D::_screen_enter() {
	_update_enable_mode(true);
}

void VisibilityEnabler2D::_screen_exit() {
	_update_enable_mode(false);
}

void VisibilityEnabler2D::set_enable_mode(EnableMode p_mode) {
	enable_mode = p_mode;
	if (is_inside_tree()) {
		_update_enable_mode(is_on_screen());
	}
}
VisibilityEnabler2D::EnableMode VisibilityEnabler2D::get_enable_mode() {
	return enable_mode;
}

void VisibilityEnabler2D::set_enable_node_path(NodePath p_path) {
	if (enable_node_path == p_path) {
		return;
	}
	enable_node_path = p_path;
	if (is_inside_tree()) {
		node_id = ObjectID();
		Node *node = get_node(enable_node_path);
		if (node) {
			node_id = node->get_instance_id();
			_update_enable_mode(is_on_screen());
		}
	}
}
NodePath VisibilityEnabler2D::get_enable_node_path() {
	return enable_node_path;
}

void VisibilityEnabler2D::_update_enable_mode(bool p_enable) {
	Node *node = static_cast<Node *>(ObjectDB::get_instance(node_id));
	if (node) {
		if (p_enable) {
			switch (enable_mode) {
				case ENABLE_MODE_INHERIT: {
					node->set_process_mode(PROCESS_MODE_INHERIT);
				} break;
				case ENABLE_MODE_ALWAYS: {
					node->set_process_mode(PROCESS_MODE_ALWAYS);
				} break;
				case ENABLE_MODE_WHEN_PAUSED: {
					node->set_process_mode(PROCESS_MODE_WHEN_PAUSED);
				} break;
			}
		} else {
			node->set_process_mode(PROCESS_MODE_DISABLED);
		}
	}
}
void VisibilityEnabler2D::_notification(int p_what) {
	if (p_what == NOTIFICATION_ENTER_TREE) {
		if (Engine::get_singleton()->is_editor_hint()) {
			return;
		}

		node_id = ObjectID();
		Node *node = get_node(enable_node_path);
		if (node) {
			node_id = node->get_instance_id();
			node->set_process_mode(PROCESS_MODE_DISABLED);
		}
	}

	if (p_what == NOTIFICATION_EXIT_TREE) {
		node_id = ObjectID();
	}
}

void VisibilityEnabler2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_enable_mode", "mode"), &VisibilityEnabler2D::set_enable_mode);
	ClassDB::bind_method(D_METHOD("get_enable_mode"), &VisibilityEnabler2D::get_enable_mode);

	ClassDB::bind_method(D_METHOD("set_enable_node_path", "path"), &VisibilityEnabler2D::set_enable_node_path);
	ClassDB::bind_method(D_METHOD("get_enable_node_path"), &VisibilityEnabler2D::get_enable_node_path);

	ADD_GROUP("Enabling", "enable_");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "enable_mode", PROPERTY_HINT_ENUM, "Inherit,Always,WhenPaused"), "set_enable_mode", "get_enable_mode");
	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "enable_node_path"), "set_enable_node_path", "get_enable_node_path");

	BIND_ENUM_CONSTANT(ENABLE_MODE_INHERIT);
	BIND_ENUM_CONSTANT(ENABLE_MODE_ALWAYS);
	BIND_ENUM_CONSTANT(ENABLE_MODE_WHEN_PAUSED);
}

VisibilityEnabler2D::VisibilityEnabler2D() {
}