/*
  Copyright 2008 Larry Gritz and the other authors and contributors.
  All Rights Reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
  * Neither the name of the software's owners nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  (This is the Modified BSD License)
*/


/// @file  filesystem.h
///
/// @brief Utilities for dealing with file names and files.  We use
/// boost::filesystem anywhere we can, but that doesn't cover everything
/// we want to do.
///
/// Some helpful nomenclature:
///  -  "filename" - a file or directory name, relative or absolute
///  -  "searchpath" - a list of directories separated by ':' or ';'.
///


#ifndef OPENIMAGEIO_FILESYSTEM_H
#define OPENIMAGEIO_FILESYSTEM_H

#include <cstdio>
#include <ctime>
#include <fstream>
#include <string>
#include <vector>

#include "export.h"
#include "oiioversion.h"
#include "string_view.h"


OIIO_NAMESPACE_ENTER
{

/// @namespace Filesystem
///
/// @brief Platform-independent utilities for manipulating file names,
/// files, directories, and other file system miscellany.

namespace Filesystem {

/// Return the filename (excluding any directories, but including the
/// file extension, if any) of a filepath.
OIIO_API std::string filename (const std::string &filepath);

/// Return the file extension (including the last '.' if
/// include_dot=true) of a filename or filepath.
OIIO_API std::string extension (const std::string &filepath,
                                 bool include_dot=true);

/// DEPRECATED.
inline std::string file_extension (const std::string &filepath) {
    return extension (filepath, false);
}

/// Return all but the last part of the path, for example,
/// parent_path("foo/bar") returns "foo", and parent_path("foo")
/// returns "".
OIIO_API std::string parent_path (const std::string &filepath);

/// Replace the file extension of a filename or filepath. Does not alter
/// filepath, just returns a new string.  Note that the new_extension
/// should contain a leading '.' dot.
OIIO_API std::string replace_extension (const std::string &filepath, 
                                         const std::string &new_extension);

/// Turn a searchpath (multiple directory paths separated by ':' or ';')
/// into a vector<string> containing each individual directory.  If
/// validonly is true, only existing and readable directories will end
/// up in the list.  N.B., the directory names will not have trailing
/// slashes.
OIIO_API void searchpath_split (const std::string &searchpath,
                                 std::vector<std::string> &dirs,
                                 bool validonly = false);

/// Find the first instance of a filename existing in a vector of
/// directories, returning the full path as a string.  If the file is
/// not found in any of the listed directories, return an empty string.
/// If the filename is absolute, the directory list will not be used.
/// If testcwd is true, "." will be tested before the searchpath;
/// otherwise, "." will only be tested if it's explicitly in dirs.  If
/// recursive is true, the directories will be searched recursively,
/// finding a matching file in any subdirectory of the directories
/// listed in dirs; otherwise.
OIIO_API std::string searchpath_find (const std::string &filename,
                                       const std::vector<std::string> &dirs,
                                       bool testcwd = true,
                                       bool recursive = false);

/// Fill a vector-of-strings with the names of all files contained by
/// directory dirname.  If recursive is true, it will return all files
/// below the directory (even in subdirectories), but if recursive is
/// false (the default)If filter_regex is supplied and non-empty, only
/// filenames matching the regular expression will be returned.  Return
/// true if ok, false if there was an error (such as dirname not being
/// found or not actually being a directory).
OIIO_API bool get_directory_entries (const std::string &dirname,
                               std::vector<std::string> &filenames,
                               bool recursive = false,
                               const std::string &filter_regex=std::string());

/// Return true if the path is an "absolute" (not relative) path.
/// If 'dot_is_absolute' is true, consider "./foo" absolute.
OIIO_API bool path_is_absolute (const std::string &path,
                                 bool dot_is_absolute=false);

/// Return true if the file exists.
///
OIIO_API bool exists (const std::string &path);


/// Return true if the file exists and is a directory.
///
OIIO_API bool is_directory (const std::string &path);

/// Return true if the file exists and is a regular file.
///
OIIO_API bool is_regular (const std::string &path);

/// Version of fopen that can handle UTF-8 paths even on Windows
///
OIIO_API FILE *fopen (string_view path, string_view mode);

/// Version of std::ifstream.open that can handle UTF-8 paths
///
OIIO_API void open (std::ifstream &stream, string_view path,
                    std::ios_base::openmode mode = std::ios_base::in);

/// Version of std::ofstream.open that can handle UTF-8 paths
///
OIIO_API void open (std::ofstream &stream, string_view path,
                    std::ios_base::openmode mode = std::ios_base::out);

/// Get last modified time of file
///
OIIO_API std::time_t last_write_time (const std::string& path);

/// Set last modified time on file
///
OIIO_API void last_write_time (const std::string& path, std::time_t time);

/// Ensure command line arguments are UTF-8 everywhere
///
OIIO_API void convert_native_arguments (int argc, const char *argv[]);

/// Turn a sequence description string into a vector of integers.
/// The sequence description can be any of the following
///  * A value (e.g., "3")
///  * A value range ("1-10", "10-1", "1-10x3", "1-10y3"):
///     START-FINISH        A range, inclusive of start & finish
///     START-FINISHxSTEP   A range with step size
///     START-FINISHySTEP   The complement of a stepped range, that is,
///                           all numbers within the range that would
///                           NOT have been selected by 'x'.
///     Note that START may be > FINISH, or STEP may be negative.
///  * Multiple values or ranges, separated by a comma (e.g., "3,4,10-20x2")
/// Retrn true upon success, false if the description was too malformed
/// to generate a sequence.
OIIO_API bool enumerate_sequence (string_view desc,
                                  std::vector<int> &numbers);

/// Given a pattern (such as "foo.#.tif" or "bar.1-10#.exr"), return a
/// normalized pattern in printf format (such as "foo.%04d.tif") and a
/// framespec (such as "1-10").
///
/// If framepadding_override is > 0, it overrides any specific padding amount
/// in the original pattern.
///
/// Return true upon success, false if the description was too malformed
/// to generate a sequence.
OIIO_API bool parse_pattern (const char *pattern,
                             int framepadding_override,
                             std::string &normalized_pattern,
                             std::string &framespec);


/// Given a normalized pattern (such as "foo.%04d.tif") and a list of frame
/// numbers, generate a list of filenames.
///
/// Return true upon success, false if the description was too malformed
/// to generate a sequence.
OIIO_API bool enumerate_file_sequence (const std::string &pattern,
                                       const std::vector<int> &numbers,
                                       std::vector<std::string> &filenames);

/// Given a normalized pattern (such as "foo_%V.%04d.tif") and a list of frame
/// numbers, generate a list of filenames. "views" is list of per-frame
/// views, or empty. In each frame filename, "%V" is replaced with the view,
/// and "%v" is replaced with the first character of the view.
///
/// Return true upon success, false if the description was too malformed
/// to generate a sequence.
OIIO_API bool enumerate_file_sequence (const std::string &pattern,
                                       const std::vector<int> &numbers,
                                       const std::vector<string_view> &views,
                                       std::vector<std::string> &filenames);

/// Given a normalized pattern (such as "/path/to/foo.%04d.tif") scan the
/// containing directory (/path/to) for matching frame numbers, views and files.
/// "%V" in the pattern matches views, while "%v" matches the first character
/// of each entry in views.
///
/// Return true upon success, false if the directory doesn't exist or the
/// pattern can't be parsed.
OIIO_API bool scan_for_matching_filenames (const std::string &pattern,
                                           const std::vector<string_view> &views,
                                           std::vector<int> &frame_numbers,
                                           std::vector<string_view> &frame_views,
                                           std::vector<std::string> &filenames);

/// Given a normalized pattern (such as "/path/to/foo.%04d.tif") scan the
/// containing directory (/path/to) for matching frame numbers and files.
///
/// Return true upon success, false if the directory doesn't exist or the
/// pattern can't be parsed.
OIIO_API bool scan_for_matching_filenames (const std::string &pattern,
                                           std::vector<int> &numbers,
                                           std::vector<std::string> &filenames);

};  // namespace Filesystem

}
OIIO_NAMESPACE_EXIT

#endif // OPENIMAGEIO_FILESYSTEM_H
