/**************************************************************************/
/*  dir_access.h                                                          */
/**************************************************************************/
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#ifndef DIR_ACCESS_H
#define DIR_ACCESS_H

#include "core/object/ref_counted.h"
#include "core/string/ustring.h"
#include "core/typedefs.h"

//@ TODO, excellent candidate for THREAD_SAFE MACRO, should go through all these and add THREAD_SAFE where it applies
class DirAccess : public RefCounted {
	GDCLASS(DirAccess, RefCounted);

public:
	enum AccessType {
		ACCESS_RESOURCES,
		ACCESS_USERDATA,
		ACCESS_FILESYSTEM,
		ACCESS_MAX
	};

	typedef Ref<DirAccess> (*CreateFunc)();

private:
	AccessType _access_type = ACCESS_FILESYSTEM;
	static CreateFunc create_func[ACCESS_MAX]; ///< set this to instance a filesystem object
	static Ref<DirAccess> _open(const String &p_path);

	Error _copy_dir(Ref<DirAccess> &p_target_da, const String &p_to, int p_chmod_flags, bool p_copy_links);
	PackedStringArray _get_contents(bool p_directories);

	thread_local static Error last_dir_open_error;
	bool include_navigational = false;
	bool include_hidden = false;

protected:
	static void _bind_methods();

	String _get_root_path() const;
	virtual String _get_root_string() const;

	AccessType get_access_type() const;
	virtual String fix_path(const String &p_path) const;

	template <typename T>
	static Ref<DirAccess> _create_builtin() {
		return memnew(T);
	}

public:
	virtual Error list_dir_begin() = 0; ///< This starts dir listing
	virtual String get_next() = 0;
	virtual bool current_is_dir() const = 0;
	virtual bool current_is_hidden() const = 0;

	virtual void list_dir_end() = 0; ///<

	virtual int get_drive_count() = 0;
	virtual String get_drive(int p_drive) = 0;
	virtual int get_current_drive();
	virtual bool drives_are_shortcuts();

	virtual Error change_dir(String p_dir) = 0; ///< can be relative or absolute, return false on success
	virtual String get_current_dir(bool p_include_drive = true) const = 0; ///< return current dir location
	virtual Error make_dir(String p_dir) = 0;
	virtual Error make_dir_recursive(const String &p_dir);
	virtual Error erase_contents_recursive(); //super dangerous, use with care!

	virtual bool file_exists(String p_file) = 0;
	virtual bool dir_exists(String p_dir) = 0;
	virtual bool is_readable(String p_dir) { return true; }
	virtual bool is_writable(String p_dir) { return true; }
	static bool exists(const String &p_dir);
	virtual uint64_t get_space_left() = 0;

	Error copy_dir(const String &p_from, String p_to, int p_chmod_flags = -1, bool p_copy_links = false);
	virtual Error copy(const String &p_from, const String &p_to, int p_chmod_flags = -1);
	virtual Error rename(String p_from, String p_to) = 0;
	virtual Error remove(String p_name) = 0;

	virtual bool is_link(String p_file) = 0;
	virtual String read_link(String p_file) = 0;
	virtual Error create_link(String p_source, String p_target) = 0;

	// Meant for editor code when we want to quickly remove a file without custom
	// handling (e.g. removing a cache file).
	static void remove_file_or_error(const String &p_path) {
		Ref<DirAccess> da = create(ACCESS_FILESYSTEM);
		if (da->file_exists(p_path)) {
			if (da->remove(p_path) != OK) {
				ERR_FAIL_MSG(vformat("Cannot remove file or directory: '%s'.", p_path));
			}
		} else {
			ERR_FAIL_MSG(vformat("Cannot remove non-existent file or directory: '%s'.", p_path));
		}
	}

	virtual String get_filesystem_type() const = 0;
	static String get_full_path(const String &p_path, AccessType p_access);
	static Ref<DirAccess> create_for_path(const String &p_path);

	static Ref<DirAccess> create(AccessType p_access);
	static Error get_open_error();

	template <typename T>
	static void make_default(AccessType p_access) {
		create_func[p_access] = _create_builtin<T>;
	}

	static Ref<DirAccess> open(const String &p_path, Error *r_error = nullptr);

	static int _get_drive_count();
	static String get_drive_name(int p_idx);

	static Error make_dir_absolute(const String &p_dir);
	static Error make_dir_recursive_absolute(const String &p_dir);
	static bool dir_exists_absolute(const String &p_dir);

	static Error copy_absolute(const String &p_from, const String &p_to, int p_chmod_flags = -1);
	static Error rename_absolute(const String &p_from, const String &p_to);
	static Error remove_absolute(const String &p_path);

	PackedStringArray get_files();
	static PackedStringArray get_files_at(const String &p_path);
	PackedStringArray get_directories();
	static PackedStringArray get_directories_at(const String &p_path);
	String _get_next();

	void set_include_navigational(bool p_enable);
	bool get_include_navigational() const;
	void set_include_hidden(bool p_enable);
	bool get_include_hidden() const;

	virtual bool is_case_sensitive(const String &p_path) const;

	DirAccess() {}
	virtual ~DirAccess() {}
};

#endif // DIR_ACCESS_H