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/*************************************************************************/
/*  editor_file_system.h                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#ifndef EDITOR_FILE_SYSTEM_H
#define EDITOR_FILE_SYSTEM_H

#include "scene/main/node.h"
#include "os/thread.h"
#include "os/dir_access.h"
#include "set.h"
#include "os/thread_safe.h"
class FileAccess;

struct EditorProgressBG;
class EditorFileSystemDirectory : public Object {

	GDCLASS( EditorFileSystemDirectory,Object );

	String name;
	uint64_t modified_time;
	bool verified; //used for checking changes

	EditorFileSystemDirectory *parent;
	Vector<EditorFileSystemDirectory*> subdirs;

	struct ImportMeta {

		struct Source {

			String path;
			String md5;
			uint64_t modified_time;
			bool missing;			

		};

		Vector<Source> sources;
		String import_editor;
		Vector<String> deps;
		bool enabled;
		bool sources_changed;

	};

	struct FileInfo {
		String file;
		StringName type;
		uint64_t modified_time;
		ImportMeta meta;
		bool verified; //used for checking changes

	};

	struct FileInfoSort {
		bool operator()(const FileInfo *p_a,const FileInfo *p_b) const {
			return p_a->file<p_b->file;
		}
	};

	void sort_files();

	Vector<FileInfo*> files;

	static void _bind_methods();


friend class EditorFileSystem;
public:

	String get_name();
	String get_path() const;

	int get_subdir_count() const;
	EditorFileSystemDirectory *get_subdir(int p_idx);
	int get_file_count() const;
	String get_file(int p_idx) const;
	String get_file_path(int p_idx) const;
	StringName get_file_type(int p_idx) const;
	bool get_file_meta(int p_idx) const;
	bool is_missing_sources(int p_idx) const;
	bool have_sources_changed(int p_idx) const;
	Vector<String> get_missing_sources(int p_idx) const;
	Vector<String> get_file_deps(int p_idx) const;
	int get_source_count(int p_idx) const;
	String get_source_file(int p_idx,int p_source) const;
	bool is_source_file_missing(int p_idx,int p_source) const;

	EditorFileSystemDirectory *get_parent();

	int find_file_index(const String& p_file) const;
	int find_dir_index(const String& p_dir) const;


	EditorFileSystemDirectory();
	~EditorFileSystemDirectory();
};

class EditorFileSystem : public Node {

	GDCLASS( EditorFileSystem, Node );

	_THREAD_SAFE_CLASS_



	struct ItemAction {

		enum Action {
			ACTION_NONE,
			ACTION_DIR_ADD,
			ACTION_DIR_REMOVE,
			ACTION_FILE_ADD,
			ACTION_FILE_REMOVE,
			ACTION_FILE_SOURCES_CHANGED
		};

		Action action;
		EditorFileSystemDirectory *dir;
		String file;
		EditorFileSystemDirectory *new_dir;
		EditorFileSystemDirectory::FileInfo *new_file;

		ItemAction() { action=ACTION_NONE; dir=NULL; new_dir=NULL; new_file=NULL; }

	};

	bool use_threads;
	Thread *thread;
	static void _thread_func(void *_userdata);

	EditorFileSystemDirectory *new_filesystem;

	bool abort_scan;
	bool scanning;
	float scan_total;


	void _scan_filesystem();

	EditorFileSystemDirectory *filesystem;

	static EditorFileSystem *singleton;

	/* Used for reading the filesystem cache file */
	struct FileCache {

		String type;
		uint64_t modification_time;
		EditorFileSystemDirectory::ImportMeta meta;
		Vector<String> deps;
	};

	HashMap<String,FileCache> file_cache;

	struct ScanProgress {

		float low;
		float hi;
		mutable EditorProgressBG *progress;
		void update(int p_current,int p_total) const;
		ScanProgress get_sub(int p_current,int p_total) const;
	};

	static EditorFileSystemDirectory::ImportMeta _get_meta(const String& p_path);

	bool _check_meta_sources(EditorFileSystemDirectory::ImportMeta & p_meta);

	void _save_filesystem_cache(EditorFileSystemDirectory *p_dir,FileAccess *p_file);

	bool _find_file(const String& p_file,EditorFileSystemDirectory ** r_d, int &r_file_pos) const;

	void _scan_fs_changes(EditorFileSystemDirectory *p_dir, const ScanProgress &p_progress);

	int md_count;

	Set<String> valid_extensions;

	void _scan_new_dir(EditorFileSystemDirectory *p_dir,DirAccess *da,const ScanProgress& p_progress);

	Thread *thread_sources;
	bool scanning_sources;
	bool scanning_sources_done;

	static void _thread_func_sources(void *_userdata);

	List<String> sources_changed;
	List<ItemAction> scan_actions;

	bool _update_scan_actions();

	static void _resource_saved(const String& p_path);
	String _find_first_from_source(EditorFileSystemDirectory* p_dir,const String &p_src) const;

protected:

	void _notification(int p_what);
	static void _bind_methods();
public:


	static EditorFileSystem* get_singleton() { return singleton; }

	EditorFileSystemDirectory *get_filesystem();
	bool is_scanning() const;
	float get_scanning_progress() const;
	void scan();
	void scan_sources();
	void get_changed_sources(List<String> *r_changed);
	void update_file(const String& p_file);
	String find_resource_from_source(const String& p_path) const;
	EditorFileSystemDirectory *get_path(const String& p_path);
	String get_file_type(const String& p_file) const;
	EditorFileSystemDirectory* find_file(const String& p_file,int* r_index) const;

	EditorFileSystem();
	~EditorFileSystem();
};

#endif // EDITOR_FILE_SYSTEM_H