/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file filename.h
 * @author drose
 * @date 1999-01-18
 */

#ifndef FILENAME_H
#define FILENAME_H

#include "dtoolbase.h"
#include "pandaFileStream.h"
#include "typeHandle.h"
#include "register_type.h"
#include "vector_string.h"
#include "textEncoder.h"

#include <assert.h>

class DSearchPath;

/**
 * The name of a file, such as a texture file or an Egg file.  Stores the full
 * pathname, and includes functions for extracting out the directory prefix
 * part and the file extension and stuff.
 *
 * A Filename is also aware of the mapping between the Unix-like filename
 * convention we use internally, and the local OS's specific filename
 * convention, and it knows how to perform basic OS-specific I/O, like testing
 * for file existence and searching a searchpath, as well as the best way to
 * open an fstream for reading or writing.
 */
class EXPCL_DTOOL_DTOOLUTIL Filename {
PUBLISHED:
  enum Type {
    // These type values must fit within the bits allocated for F_type, below.
    T_general    = 0x00,
    T_dso        = 0x01,
    T_executable = 0x02,
    // Perhaps other types will be added later.
  };

public:
  enum Flags {
    F_type            = 0x0f,
    F_binary          = 0x10,
    F_text            = 0x20,
    F_pattern         = 0x40,
  };

  INLINE Filename(const char *filename);
  INLINE Filename(const std::string &filename);
  INLINE Filename(const std::wstring &filename);
  INLINE Filename(const Filename &copy);
  INLINE Filename(std::string &&filename) noexcept;
  INLINE Filename(Filename &&from) noexcept;

PUBLISHED:
  INLINE Filename();
  Filename(const Filename &dirname, const Filename &basename);

#ifdef HAVE_PYTHON
  EXTENSION(Filename(PyObject *path));

  EXTENSION(PyObject *__reduce__(PyObject *self) const);
#endif

  // Static constructors to explicitly create a filename that refers to a text
  // or binary file.  This is in lieu of calling set_text() or set_binary() or
  // set_type().
  INLINE static Filename text_filename(const Filename &filename);
  INLINE static Filename text_filename(const std::string &filename);
  INLINE static Filename binary_filename(const Filename &filename);
  INLINE static Filename binary_filename(const std::string &filename);
  INLINE static Filename dso_filename(const std::string &filename);
  INLINE static Filename executable_filename(const std::string &filename);

  INLINE static Filename pattern_filename(const std::string &filename);

  static Filename from_os_specific(const std::string &os_specific,
                                   Type type = T_general);
  static Filename from_os_specific_w(const std::wstring &os_specific,
                                     Type type = T_general);
  static Filename expand_from(const std::string &user_string,
                              Type type = T_general);
  static Filename temporary(const std::string &dirname, const std::string &prefix,
                            const std::string &suffix = std::string(),
                            Type type = T_general);

  static const Filename &get_home_directory();
  static const Filename &get_temp_directory();
  static const Filename &get_user_appdata_directory();
  static const Filename &get_common_appdata_directory();

  // Assignment is via the = operator.
  INLINE Filename &operator = (const std::string &filename);
  INLINE Filename &operator = (const std::wstring &filename);
  INLINE Filename &operator = (const char *filename);
  INLINE Filename &operator = (const Filename &copy);
  INLINE Filename &operator = (std::string &&filename) noexcept;
  INLINE Filename &operator = (Filename &&from) noexcept;

  // And retrieval is by any of the classic string operations.
  INLINE operator const std::string & () const;
  INLINE const char *c_str() const;
  INLINE bool empty() const;
  INLINE size_t length() const;
  INLINE char operator [] (size_t n) const;

  EXTENSION(PyObject *__repr__() const);
  EXTENSION(PyObject *__fspath__() const);

  INLINE std::string substr(size_t begin) const;
  INLINE std::string substr(size_t begin, size_t end) const;
  INLINE void operator += (const std::string &other);
  INLINE Filename operator + (const std::string &other) const;

  INLINE Filename operator / (const Filename &other) const;

  // Or, you can use any of these.
  INLINE std::string get_fullpath() const;
  INLINE std::wstring get_fullpath_w() const;
  INLINE std::string get_dirname() const;
  INLINE std::string get_basename() const;
  INLINE std::string get_fullpath_wo_extension() const;
  INLINE std::string get_basename_wo_extension() const;
  INLINE std::string get_extension() const;

  // You can also use any of these to reassign pieces of the filename.
  void set_fullpath(const std::string &s);
  void set_dirname(const std::string &s);
  void set_basename(const std::string &s);
  void set_fullpath_wo_extension(const std::string &s);
  void set_basename_wo_extension(const std::string &s);
  void set_extension(const std::string &s);

  // Setting these flags appropriately is helpful when opening or searching
  // for a file; it helps the Filename resolve OS-specific conventions (for
  // instance, that dynamic library names should perhaps be changed from .so
  // to .dll).
  INLINE void set_binary();
  INLINE void set_text();
  INLINE bool is_binary() const;
  INLINE bool is_text() const;
  INLINE bool is_binary_or_text() const;

  INLINE void set_type(Type type);
  INLINE Type get_type() const;

  INLINE void set_pattern(bool pattern);
  INLINE bool get_pattern() const;

  INLINE bool has_hash() const;
  Filename get_filename_index(int index) const;

  INLINE std::string get_hash_to_end() const;
  void set_hash_to_end(const std::string &s);

  void extract_components(vector_string &components) const;
  void standardize();

  // The following functions deal with the outside world.

  INLINE bool is_local() const;
  INLINE bool is_fully_qualified() const;
  void make_absolute();
  void make_absolute(const Filename &start_directory);

  bool make_canonical();
  bool make_true_case();

  std::string to_os_specific() const;
  std::wstring to_os_specific_w() const;
  std::string to_os_generic() const;
  std::string to_os_short_name() const;
  std::string to_os_long_name() const;

  bool exists() const;
  bool is_regular_file() const;
  bool is_writable() const;
  bool is_directory() const;
  bool is_executable() const;
  int compare_timestamps(const Filename &other,
                         bool this_missing_is_old = true,
                         bool other_missing_is_old = true) const;
  time_t get_timestamp() const;
  time_t get_access_timestamp() const;
  std::streamsize get_file_size() const;

  bool resolve_filename(const DSearchPath &searchpath,
                        const std::string &default_extension = std::string());
  bool make_relative_to(Filename directory, bool allow_backups = true);
  int find_on_searchpath(const DSearchPath &searchpath);

  bool scan_directory(vector_string &contents) const;
#ifdef HAVE_PYTHON
  EXTENSION(PyObject *scan_directory() const);
#endif

  bool open_read(std::ifstream &stream) const;
  bool open_write(std::ofstream &stream, bool truncate = true) const;
  bool open_append(std::ofstream &stream) const;
  bool open_read_write(std::fstream &stream, bool truncate = false) const;
  bool open_read_append(std::fstream &stream) const;

#ifdef USE_PANDAFILESTREAM
  bool open_read(pifstream &stream) const;
  bool open_write(pofstream &stream, bool truncate = true) const;
  bool open_append(pofstream &stream) const;
  bool open_read_write(pfstream &stream, bool truncate = false) const;
  bool open_read_append(pfstream &stream) const;
#endif  // USE_PANDAFILESTREAM

  bool chdir() const;
  bool touch() const;
  bool unlink() const;
  BLOCKING bool rename_to(const Filename &other) const;
  BLOCKING bool copy_to(const Filename &other) const;

  bool make_dir() const;
  bool mkdir() const;
  bool rmdir() const;

  // Comparison operators are handy.
  INLINE bool operator == (const std::string &other) const;
  INLINE bool operator != (const std::string &other) const;
  INLINE bool operator < (const std::string &other) const;
  INLINE int compare_to(const Filename &other) const;
  INLINE bool __nonzero__() const;
  int get_hash() const;

  INLINE void output(std::ostream &out) const;

  INLINE static void set_filesystem_encoding(TextEncoder::Encoding encoding);
  INLINE static TextEncoder::Encoding get_filesystem_encoding();

public:
  bool atomic_compare_and_exchange_contents(std::string &orig_contents, const std::string &old_contents, const std::string &new_contents) const;
  bool atomic_read_contents(std::string &contents) const;

protected:
  void locate_basename();
  void locate_extension();
  void locate_hash();
  size_t get_common_prefix(const std::string &other) const;
  static int count_slashes(const std::string &str);
  bool r_make_canonical(const Filename &cwd);

  std::string _filename;
  // We'll make these size_t instead of string::size_type to help out
  // cppParser.
  size_t _dirname_end;
  size_t _basename_start;
  size_t _basename_end;
  size_t _extension_start;
  size_t _hash_start;
  size_t _hash_end;

  int _flags;

  static TextEncoder::Encoding _filesystem_encoding;
  static TVOLATILE AtomicAdjust::Pointer _home_directory;
  static TVOLATILE AtomicAdjust::Pointer _temp_directory;
  static TVOLATILE AtomicAdjust::Pointer _user_appdata_directory;
  static TVOLATILE AtomicAdjust::Pointer _common_appdata_directory;

#ifdef ANDROID
public:
  static std::string _internal_data_dir;
#endif

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    register_type(_type_handle, "Filename");
  }

private:
  static TypeHandle _type_handle;
};

INLINE std::ostream &operator << (std::ostream &out, const Filename &n) {
  n.output(out);
  return out;
}

#include "filename.I"

#endif