/*************************************************************************/
/*  editor_sectioned_inspector.cpp                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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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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/*************************************************************************/

#include "editor_sectioned_inspector.h"

#include "editor_property_name_processor.h"
#include "editor_scale.h"
#include "core/object/class_db.h"
#include "core/containers/list.h"
#include "core/math/vector2.h"
#include "core/os/memory.h"
#include "core/string/string_name.h"
#include "core/typedefs.h"
#include "core/variant/variant.h"
#include "core/containers/vector.h"
#include "editor/editor_inspector.h"
#include "scene/gui/box_container.h"
#include "scene/main/control.h"
#include "scene/gui/line_edit.h"
#include "scene/gui/tree.h"

class SectionedInspectorFilter : public Object {
	GDCLASS(SectionedInspectorFilter, Object);

	Object *edited;
	String section;
	bool allow_sub;

	bool _set(const StringName &p_name, const Variant &p_value) {
		if (!edited) {
			return false;
		}

		String name = p_name;
		if (section != "") {
			name = section + "/" + name;
		}

		bool valid;
		edited->set(name, p_value, &valid);
		return valid;
	}

	bool _get(const StringName &p_name, Variant &r_ret) const {
		if (!edited) {
			return false;
		}

		String name = p_name;
		if (section != "") {
			name = section + "/" + name;
		}

		bool valid = false;

		r_ret = edited->get(name, &valid);
		return valid;
	}
	void _get_property_list(List<PropertyInfo> *p_list) const {
		if (!edited) {
			return;
		}

		List<PropertyInfo> pinfo;
		edited->get_property_list(&pinfo);
		for (List<PropertyInfo>::Element *E = pinfo.front(); E; E = E->next()) {
			PropertyInfo pi = E->get();
			int sp = pi.name.find("/");

			if (pi.name == "resource_path" || pi.name == "resource_name" || pi.name == "resource_local_to_scene" || pi.name.begins_with("script/") || pi.name.begins_with("_global_script")) { //skip resource stuff
				continue;
			}

			if (sp == -1) {
				pi.name = "global/" + pi.name;
			}

			if (pi.name.begins_with(section + "/")) {
				pi.name = pi.name.replace_first(section + "/", "");
				if (!allow_sub && pi.name.find("/") != -1) {
					continue;
				}
				p_list->push_back(pi);
			}
		}
	}

	bool property_can_revert(const String &p_name) {
		return edited->call("property_can_revert", section + "/" + p_name);
	}

	Variant property_get_revert(const String &p_name) {
		return edited->call("property_get_revert", section + "/" + p_name);
	}

protected:
	static void _bind_methods() {
		ClassDB::bind_method("property_can_revert", &SectionedInspectorFilter::property_can_revert);
		ClassDB::bind_method("property_get_revert", &SectionedInspectorFilter::property_get_revert);
	}

public:
	void set_section(const String &p_section, bool p_allow_sub) {
		section = p_section;
		allow_sub = p_allow_sub;
		_change_notify();
	}

	void set_edited(Object *p_edited) {
		edited = p_edited;
		_change_notify();
	}

	SectionedInspectorFilter() {
		edited = nullptr;
	}
};

void SectionedInspector::_bind_methods() {
	ClassDB::bind_method("_section_selected", &SectionedInspector::_section_selected);
	ClassDB::bind_method("_search_changed", &SectionedInspector::_search_changed);

	ClassDB::bind_method("update_category_list", &SectionedInspector::update_category_list);
}

void SectionedInspector::_section_selected() {
	if (!sections->get_selected()) {
		return;
	}

	selected_category = sections->get_selected()->get_metadata(0);
	filter->set_section(selected_category, sections->get_selected()->get_children() == nullptr);
	inspector->set_property_prefix(selected_category + "/");
}

void SectionedInspector::set_current_section(const String &p_section) {
	if (section_map.has(p_section)) {
		section_map[p_section]->select(0);
	}
}

String SectionedInspector::get_current_section() const {
	if (sections->get_selected()) {
		return sections->get_selected()->get_metadata(0);
	} else {
		return "";
	}
}

String SectionedInspector::get_full_item_path(const String &p_item) {
	String base = get_current_section();

	if (base != "") {
		return base + "/" + p_item;
	} else {
		return p_item;
	}
}

void SectionedInspector::edit(Object *p_object) {
	if (!p_object) {
		obj = 0;
		sections->clear();

		filter->set_edited(nullptr);
		inspector->edit(nullptr);

		return;
	}

	ObjectID id = p_object->get_instance_id();

	inspector->set_object_class(p_object->get_class());

	if (obj != id) {
		obj = id;
		update_category_list();

		filter->set_edited(p_object);
		inspector->edit(filter);

		TreeItem *first_item = sections->get_root();
		if (first_item) {
			while (first_item->get_children()) {
				first_item = first_item->get_children();
			}

			first_item->select(0);
			selected_category = first_item->get_metadata(0);
		}
	} else {
		update_category_list();
	}
}

void SectionedInspector::update_category_list() {
	sections->clear();

	Object *o = ObjectDB::get_instance(obj);

	if (!o) {
		return;
	}

	List<PropertyInfo> pinfo;
	o->get_property_list(&pinfo);

	section_map.clear();

	TreeItem *root = sections->create_item();
	section_map[""] = root;

	String filter;
	if (search_box) {
		filter = search_box->get_text();
	}

	for (List<PropertyInfo>::Element *E = pinfo.front(); E; E = E->next()) {
		PropertyInfo pi = E->get();

		if (pi.usage & PROPERTY_USAGE_CATEGORY) {
			continue;
		} else if (!(pi.usage & PROPERTY_USAGE_EDITOR)) {
			continue;
		}

		if (pi.name.find(":") != -1 || pi.name == "script" || pi.name == "resource_name" || pi.name == "resource_path" || pi.name == "resource_local_to_scene" || pi.name.begins_with("_global_script")) {
			continue;
		}

		if (!filter.empty() && pi.name.findn(filter) == -1 && pi.name.replace("/", " ").capitalize().findn(filter) == -1) {
			continue;
		}

		int sp = pi.name.find("/");
		if (sp == -1) {
			pi.name = "global/" + pi.name;
		}

		Vector<String> sectionarr = pi.name.split("/");
		String metasection;

		int sc = MIN(2, sectionarr.size() - 1);

		for (int i = 0; i < sc; i++) {
			TreeItem *parent = section_map[metasection];
			parent->set_custom_bg_color(0, get_theme_color("prop_subsection", "Editor"));

			if (i > 0) {
				metasection += "/" + sectionarr[i];
			} else {
				metasection = sectionarr[i];
			}

			if (!section_map.has(metasection)) {
				TreeItem *ms = sections->create_item(parent);
				section_map[metasection] = ms;
				ms->set_text(0, EditorPropertyNameProcessor::get_singleton()->process_name(sectionarr[i]));
				ms->set_tooltip(0, EditorPropertyNameProcessor::get_singleton()->make_tooltip_for_name(sectionarr[i]));
				ms->set_metadata(0, metasection);
				ms->set_selectable(0, false);
			}

			if (i == sc - 1) {
				//if it has children, make selectable
				section_map[metasection]->set_selectable(0, true);
			}
		}
	}

	if (section_map.has(selected_category)) {
		section_map[selected_category]->select(0);
	}

	inspector->update_tree();
}

void SectionedInspector::register_search_box(LineEdit *p_box) {
	search_box = p_box;
	inspector->register_text_enter(p_box);
	search_box->connect("text_changed", this, "_search_changed");
}

void SectionedInspector::_search_changed(const String &p_what) {
	update_category_list();
}

EditorInspector *SectionedInspector::get_inspector() {
	return inspector;
}

SectionedInspector::SectionedInspector() :
		obj(0),
		sections(memnew(Tree)),
		filter(memnew(SectionedInspectorFilter)),
		inspector(memnew(EditorInspector)),
		search_box(nullptr) {
	add_theme_constant_override("autohide", 1); // Fixes the dragger always showing up

	VBoxContainer *left_vb = memnew(VBoxContainer);
	left_vb->set_custom_minimum_size(Size2(190, 0) * EDSCALE);
	add_child(left_vb);

	sections->set_v_size_flags(SIZE_EXPAND_FILL);
	sections->set_hide_root(true);

	left_vb->add_child(sections, true);

	VBoxContainer *right_vb = memnew(VBoxContainer);
	right_vb->set_custom_minimum_size(Size2(300, 0) * EDSCALE);
	right_vb->set_h_size_flags(SIZE_EXPAND_FILL);
	add_child(right_vb);

	inspector->set_v_size_flags(SIZE_EXPAND_FILL);
	right_vb->add_child(inspector, true);
	inspector->set_use_doc_hints(true);

	sections->connect("cell_selected", this, "_section_selected");
}

SectionedInspector::~SectionedInspector() {
	memdelete(filter);
}