/*************************************************************************/
/*  editor_sub_scene.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 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 */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/

#include "editor_sub_scene.h"

#include "editor/editor_node.h"
#include "scene/resources/packed_scene.h"
#include "core/class_db.h"
#include "core/error_macros.h"
#include "core/io/resource_loader.h"
#include "core/os/memory.h"
#include "core/reference.h"
#include "core/string_name.h"
#include "core/variant.h"
#include "editor/editor_file_dialog.h"
#include "scene/2d/canvas_item.h"
#include "scene/gui/box_container.h"
#include "scene/gui/button.h"
#include "scene/gui/control.h"
#include "scene/gui/line_edit.h"
#include "scene/gui/tree.h"
#include "scene/main/node.h"

void EditorSubScene::_path_selected(const String &p_path) {
	path->set_text(p_path);
	_path_changed(p_path);
}

void EditorSubScene::_path_changed(const String &p_path) {
	tree->clear();

	if (scene) {
		memdelete(scene);
		scene = nullptr;
	}

	if (p_path == "") {
		return;
	}

	Ref<PackedScene> ps = ResourceLoader::load(p_path, "PackedScene");

	if (ps.is_null()) {
		return;
	}

	scene = ps->instance();
	if (!scene) {
		return;
	}

	_fill_tree(scene, nullptr);
}

void EditorSubScene::_path_browse() {
	file_dialog->popup_centered_ratio();
}

void EditorSubScene::_notification(int p_what) {
	if (p_what == NOTIFICATION_VISIBILITY_CHANGED) {
		if (is_visible() && scene == nullptr) {
			_path_browse();
		}
	}
}

void EditorSubScene::_fill_tree(Node *p_node, TreeItem *p_parent) {
	TreeItem *it = tree->create_item(p_parent);
	it->set_metadata(0, p_node);
	it->set_text(0, p_node->get_name());
	it->set_editable(0, false);
	it->set_selectable(0, true);
	it->set_icon(0, EditorNode::get_singleton()->get_object_icon(p_node, "Node"));

	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *c = p_node->get_child(i);
		if (c->get_owner() != scene) {
			continue;
		}
		_fill_tree(c, it);
	}
}

void EditorSubScene::_selected_changed() {
	TreeItem *item = tree->get_selected();
	ERR_FAIL_COND(!item);
	Node *n = item->get_metadata(0);

	if (!n || !selection.find(n)) {
		selection.clear();
		is_root = false;
	}
}

void EditorSubScene::_item_multi_selected(Object *p_object, int p_cell, bool p_selected) {
	if (!is_root) {
		TreeItem *item = Object::cast_to<TreeItem>(p_object);
		ERR_FAIL_COND(!item);

		Node *n = item->get_metadata(0);

		if (!n) {
			return;
		}
		if (p_selected) {
			if (n == scene) {
				is_root = true;
				selection.clear();
			}
			selection.push_back(n);
		} else {
			List<Node *>::Element *E = selection.find(n);

			if (E) {
				selection.erase(E);
			}
		}
	}
}

void EditorSubScene::_remove_selection_child(Node *p_node) {
	if (p_node->get_child_count() > 0) {
		for (int i = 0; i < p_node->get_child_count(); i++) {
			Node *c = p_node->get_child(i);
			List<Node *>::Element *E = selection.find(c);
			if (E) {
				selection.move_to_back(E);
				selection.pop_back();
			}
			if (c->get_child_count() > 0) {
				_remove_selection_child(c);
			}
		}
	}
}

void EditorSubScene::ok_pressed() {
	if (selection.size() <= 0) {
		return;
	}
	for (List<Node *>::Element *E = selection.front(); E; E = E->next()) {
		Node *c = E->get();
		_remove_selection_child(c);
	}
	emit_signal("subscene_selected");
	hide();
	clear();
}

void EditorSubScene::_reown(Node *p_node, List<Node *> *p_to_reown) {
	if (p_node == scene) {
		scene->set_filename("");
		p_to_reown->push_back(p_node);
	} else if (p_node->get_owner() == scene) {
		p_to_reown->push_back(p_node);
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *c = p_node->get_child(i);
		_reown(c, p_to_reown);
	}
}

void EditorSubScene::move(Node *p_new_parent, Node *p_new_owner) {
	if (!scene) {
		return;
	}

	if (selection.size() <= 0) {
		return;
	}

	for (List<Node *>::Element *E = selection.front(); E; E = E->next()) {
		Node *selnode = E->get();
		if (!selnode) {
			return;
		}
		List<Node *> to_reown;
		_reown(selnode, &to_reown);
		if (selnode != scene) {
			selnode->get_parent()->remove_child(selnode);
		}

		p_new_parent->add_child(selnode);
		for (List<Node *>::Element *F = to_reown.front(); F; F = F->next()) {
			F->get()->set_owner(p_new_owner);
		}
	}
	if (!is_root) {
		memdelete(scene);
	}
	scene = nullptr;
	//return selnode;
}

void EditorSubScene::clear() {
	path->set_text("");
	_path_changed("");
}

void EditorSubScene::_bind_methods() {
	ClassDB::bind_method(D_METHOD("_path_selected"), &EditorSubScene::_path_selected);
	ClassDB::bind_method(D_METHOD("_path_changed"), &EditorSubScene::_path_changed);
	ClassDB::bind_method(D_METHOD("_path_browse"), &EditorSubScene::_path_browse);
	ClassDB::bind_method(D_METHOD("_item_multi_selected"), &EditorSubScene::_item_multi_selected);
	ClassDB::bind_method(D_METHOD("_selected_changed"), &EditorSubScene::_selected_changed);
	ADD_SIGNAL(MethodInfo("subscene_selected"));
}

EditorSubScene::EditorSubScene() {
	scene = nullptr;
	is_root = false;

	set_title(TTR("Select Node(s) to Import"));
	set_hide_on_ok(false);

	VBoxContainer *vb = memnew(VBoxContainer);
	add_child(vb);
	//set_child_rect(vb);

	HBoxContainer *hb = memnew(HBoxContainer);
	path = memnew(LineEdit);
	path->connect("text_entered", this, "_path_changed");
	hb->add_child(path);
	path->set_h_size_flags(SIZE_EXPAND_FILL);
	Button *b = memnew(Button);
	b->set_text(TTR("Browse"));
	hb->add_child(b);
	b->connect("pressed", this, "_path_browse");
	vb->add_margin_child(TTR("Scene Path:"), hb);

	tree = memnew(Tree);
	tree->set_v_size_flags(SIZE_EXPAND_FILL);
	vb->add_margin_child(TTR("Import From Node:"), tree, true);
	tree->set_select_mode(Tree::SELECT_MULTI);
	tree->connect("multi_selected", this, "_item_multi_selected");
	//tree->connect("nothing_selected", this, "_deselect_items");
	tree->connect("cell_selected", this, "_selected_changed");

	tree->connect("item_activated", this, "_ok", make_binds(), CONNECT_DEFERRED);

	file_dialog = memnew(EditorFileDialog);
	List<String> extensions;
	ResourceLoader::get_recognized_extensions_for_type("PackedScene", &extensions);

	for (List<String>::Element *E = extensions.front(); E; E = E->next()) {
		file_dialog->add_filter("*." + E->get());
	}

	file_dialog->set_mode(EditorFileDialog::MODE_OPEN_FILE);
	add_child(file_dialog);
	file_dialog->connect("file_selected", this, "_path_selected");
}