/*************************************************************************/
/*  container.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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/* 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 "container.h"
#include "core/message_queue.h"
#include "scene/scene_string_names.h"

void Container::_child_minsize_changed() {

	//Size2 ms = get_combined_minimum_size();
	//if (ms.width > get_size().width || ms.height > get_size().height) {
	minimum_size_changed();
	queue_sort();
}

void Container::add_child_notify(Node *p_child) {

	Control::add_child_notify(p_child);

	Control *control = Object::cast_to<Control>(p_child);
	if (!control)
		return;

	control->connect("size_flags_changed", this, "queue_sort");
	control->connect("minimum_size_changed", this, "_child_minsize_changed");
	control->connect("visibility_changed", this, "_child_minsize_changed");

	minimum_size_changed();
	queue_sort();
}

void Container::move_child_notify(Node *p_child) {

	Control::move_child_notify(p_child);

	if (!Object::cast_to<Control>(p_child))
		return;

	minimum_size_changed();
	queue_sort();
}

void Container::remove_child_notify(Node *p_child) {

	Control::remove_child_notify(p_child);

	Control *control = Object::cast_to<Control>(p_child);
	if (!control)
		return;

	control->disconnect("size_flags_changed", this, "queue_sort");
	control->disconnect("minimum_size_changed", this, "_child_minsize_changed");
	control->disconnect("visibility_changed", this, "_child_minsize_changed");

	minimum_size_changed();
	queue_sort();
}

void Container::_sort_children() {

	if (!is_inside_tree())
		return;

	notification(NOTIFICATION_SORT_CHILDREN);
	emit_signal(SceneStringNames::get_singleton()->sort_children);
	pending_sort = false;
}

void Container::fit_child_in_rect(Control *p_child, const Rect2 &p_rect) {

	ERR_FAIL_COND(!p_child);
	ERR_FAIL_COND(p_child->get_parent() != this);

	Size2 minsize = p_child->get_combined_minimum_size();
	Rect2 r = p_rect;

	if (!(p_child->get_h_size_flags() & SIZE_FILL)) {
		r.size.x = minsize.width;
		if (p_child->get_h_size_flags() & SIZE_SHRINK_END) {
			r.position.x += p_rect.size.width - minsize.width;
		} else if (p_child->get_h_size_flags() & SIZE_SHRINK_CENTER) {
			r.position.x += Math::floor((p_rect.size.x - minsize.width) / 2);
		} else {
			r.position.x += 0;
		}
	}

	if (!(p_child->get_v_size_flags() & SIZE_FILL)) {
		r.size.y = minsize.y;
		if (p_child->get_v_size_flags() & SIZE_SHRINK_END) {
			r.position.y += p_rect.size.height - minsize.height;
		} else if (p_child->get_v_size_flags() & SIZE_SHRINK_CENTER) {
			r.position.y += Math::floor((p_rect.size.y - minsize.height) / 2);
		} else {
			r.position.y += 0;
		}
	}

	for (int i = 0; i < 4; i++)
		p_child->set_anchor(Margin(i), ANCHOR_BEGIN);

	p_child->set_position(r.position);
	p_child->set_size(r.size);
	p_child->set_rotation(0);
	p_child->set_scale(Vector2(1, 1));
}

void Container::queue_sort() {

	if (!is_inside_tree())
		return;

	if (pending_sort)
		return;

	MessageQueue::get_singleton()->push_call(this, "_sort_children");
	pending_sort = true;
}

void Container::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_TREE: {
			pending_sort = false;
			queue_sort();
		} break;
		case NOTIFICATION_RESIZED: {

			queue_sort();
		} break;
		case NOTIFICATION_THEME_CHANGED: {

			queue_sort();
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {

			if (is_visible_in_tree()) {
				queue_sort();
			}
		} break;
	}
}

String Container::get_configuration_warning() const {

	String warning = Control::get_configuration_warning();

	if (get_class() == "Container" && get_script().is_null()) {
		if (warning != String()) {
			warning += "\n\n";
		}
		warning += TTR("Container by itself serves no purpose unless a script configures its children placement behavior.\nIf you don't intend to add a script, use a plain Control node instead.");
	}
	return warning;
}

void Container::_bind_methods() {

	ClassDB::bind_method(D_METHOD("_sort_children"), &Container::_sort_children);
	ClassDB::bind_method(D_METHOD("_child_minsize_changed"), &Container::_child_minsize_changed);

	ClassDB::bind_method(D_METHOD("queue_sort"), &Container::queue_sort);
	ClassDB::bind_method(D_METHOD("fit_child_in_rect", "child", "rect"), &Container::fit_child_in_rect);

	BIND_CONSTANT(NOTIFICATION_SORT_CHILDREN);
	ADD_SIGNAL(MethodInfo("sort_children"));
}

Container::Container() {

	pending_sort = false;
}
