// -*- Mode: C++ -*-
//
// Copyright (C) 2013-2015 Red Hat, Inc.
//
// This file is part of the GNU Application Binary Interface Generic
// Analysis and Instrumentation Library (libabigail).  This library is
// free software; you can redistribute it and/or modify it under the
// terms of the GNU Lesser General Public License as published by the
// Free Software Foundation; either version 3, or (at your option) any
// later version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Lesser Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this program; see the file COPYING-LGPLV3.  If
// not, see <http://www.gnu.org/licenses/>.

///@file

#include <tr1/memory>
#include <string>
#include <ostream>
#include <istream>
#include <iostream>

namespace abigail
{

namespace tools_utils
{

using std::ostream;
using std::istream;
using std::ifstream;
using std::string;
using std::tr1::shared_ptr;

bool file_exists(const string&);
bool is_regular_file(const string&);
bool is_dir(const string&);
bool base_name(string const& path,
	       string& file_name);
bool ensure_dir_path_created(const string&);
bool ensure_parent_dir_created(const string&);
bool check_file(const string& path, ostream& out);

class temp_file;

/// Convenience typedef for a shared_ptr to @ref temp_file.
typedef shared_ptr<temp_file> temp_file_sptr;

/// A temporary file.
///
/// This is a helper file around the  mkstemp API.
///
/// Once the temporary file is created, users can interact with it
/// using an iostream.  They can also get the path to the newly
/// created temporary file.
///
/// When the instance of @ref temp_file is destroyed, the underlying
/// resources are de-allocated, the underlying temporary file is
/// closed and removed.
class temp_file
{
  struct priv;
  typedef shared_ptr<priv> priv_sptr;

  priv_sptr priv_;

  temp_file();

public:

  bool
  is_good() const;

  const char*
  get_path() const;

  std::iostream&
  get_stream();

  static temp_file_sptr
  create();
}; // end class temp_file

size_t
get_random_number();

string
get_random_number_as_string();

/// The different types of files understood the bi* suite of tools.
enum file_type
{
  /// A file type we don't know about.
  FILE_TYPE_UNKNOWN,
  /// The native xml file format representing a translation unit.
  FILE_TYPE_NATIVE_BI,
  /// An elf file.  Read this kind of file should yield an
  /// abigail::corpus type.
  FILE_TYPE_ELF,
  /// An archive (AR) file.
  FILE_TYPE_AR,
  // A native xml file format representing a corpus of one or several
  // translation units.
  FILE_TYPE_XML_CORPUS,
  // A zip file, possibly containing a corpus of one of several
  // translation units.
  FILE_TYPE_ZIP_CORPUS,
  /// An RPM (.rpm) binary file
  FILE_TYPE_RPM,
  /// An SRPM (.src.rpm) file
  FILE_TYPE_SRPM,
};

/// Exit status for abidiff and abicompat tools.
///
/// It's actually a bit mask.  The valu of each enumerator is a power
/// of two.
enum abidiff_status
{
  /// This is for when the compared ABIs are equal.
  ///
  /// Its numerical value is 0.
  ABIDIFF_OK = 0,

  /// This bit is set if there an application error.
  ///
  /// Its numerical value is 1.
  ABIDIFF_ERROR = 1,

  /// This bit is set if the tool is invoked in an non appropriate
  /// manner.
  ///
  /// Its numerical value is 2.
  ABIDIFF_USAGE_ERROR = 1 << 1,

  /// This bit is set if the ABIs being compared are different.
  ///
  /// Its numerical value is 4.
  ABIDIFF_ABI_CHANGE = 1 << 2,

  /// This bit is set if the ABIs being compared are different *and*
  /// are incompatible.
  ///
  /// Its numerical value is 8.
  ABIDIFF_ABI_INCOMPATIBLE_CHANGE = 1 << 3
};

abidiff_status
operator|(abidiff_status, abidiff_status);

abidiff_status
operator&(abidiff_status, abidiff_status);

abidiff_status&
operator|=(abidiff_status&l, abidiff_status r);
bool
abidiff_status_has_error(abidiff_status s);

bool
abidiff_status_has_abi_change(abidiff_status s);

bool
abidiff_status_has_incompatible_abi_change(abidiff_status s);

ostream&
operator<<(ostream& output, file_type r);

file_type guess_file_type(istream& in);
file_type guess_file_type(const string& file_path);

std::tr1::shared_ptr<char>
make_path_absolute(const char*p);

}// end namespace tools_utils
}//end namespace abigail