/* A program to enquire about the configuration of the PPL  -*- C++ -*-
   and of the applications using it.
   Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
   Copyright (C) 2010-2016 BUGSENG srl (http://bugseng.com)

This file is part of the Parma Polyhedra Library (PPL).

The PPL is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The PPL 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 Public License
for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.

For the most up-to-date information see the Parma Polyhedra Library
site: http://bugseng.com/products/ppl/ . */

#include "ppl.hh"
#include "BUGS.hh"
#include "COPYING.hh"
#include "CREDITS.hh"

namespace PPL = Parma_Polyhedra_Library;

#if PPL_VERSION_MAJOR == 0 && PPL_VERSION_MINOR < 8
#error "PPL version 0.8 or following is required"
#endif

#include <cstdarg>
#include <cstring>
#include <cctype>
#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <stdexcept>
#include <string>

#ifdef PPL_HAVE_GETOPT_H
#include <getopt.h>

// Try to accommodate non-GNU implementations of `getopt()'.
#if !defined(no_argument) && defined(NO_ARG)
#define no_argument NO_ARG
#endif

#if !defined(required_argument) && defined(REQUIRED_ARG)
#define required_argument REQUIRED_ARG
#endif

#if !defined(optional_argument) && defined(OPTIONAL_ARG)
#define optional_argument OPTIONAL_ARG
#endif

#endif // defined(PPL_HAVE_GETOPT_H)

#ifdef PPL_HAVE_UNISTD_H
// Include this for `getopt()': especially important if we do not have
// <getopt.h>.
#include <unistd.h>
#endif


namespace {

enum Format {
  NO_FORMAT,
  PLAIN,
  MAKEFILE,
  SH,
  CSH
};

enum Interface {
  NO_INTERFACE,
  CXX,
  C,
  CIAO_PROLOG,
  GNU_PROLOG,
  SICSTUS_PROLOG,
  SWI_PROLOG,
  XSB_PROLOG,
  YAP_PROLOG,
  OCAML,
  JAVA
};

Format required_format = NO_FORMAT;

Interface required_interface = NO_INTERFACE;

#define PPL_LICENSE "GNU GENERAL PUBLIC LICENSE, Version 3"

std::string prefix;
std::string exec_prefix;

bool required_application = false;
bool required_library = false;
bool required_prefix = false;
bool required_exec_prefix = false;
bool required_configure_options = false;
bool required_version = false;
bool required_version_major = false;
bool required_version_minor = false;
bool required_version_revision = false;
bool required_version_beta = false;
bool required_banner = false;
bool required_coefficients = false;
bool required_includedir = false;
bool required_bindir = false;
bool required_libdir = false;
bool required_cppflags = false;
bool required_cflags = false;
bool required_cxxflags = false;
bool required_ldflags = false;
bool required_license = false;
bool required_copying = false;
bool required_bugs = false;
bool required_credits = false;

unsigned num_required_items = 0;


#define OPTION_LETTERS "hF:I:ALp::e::OVMNRBEniblPCXDgcur"

const char* program_name = 0;

void
fatal(const char* format, ...) __attribute__((__noreturn__));

void
fatal(const char* format, ...) {
  va_list ap;
  va_start(ap, format);
  fprintf(stderr, "%s: ", program_name);
  vfprintf(stderr, format, ap);
  fprintf(stderr, "\n");
  va_end(ap);
  exit(1);
}

void
internal_error() __attribute__((__noreturn__));

void
internal_error() {
  fatal("internal error: please submit a bug report to ppl-devel@cs.unipr.it");
}

inline char
to_lower(char c) {
  return
    static_cast<char>(tolower(static_cast<int>(static_cast<unsigned char>(c))));
}

bool
strcaseeq(const char* s1, const char* s2) {
  while (*s1 != '\0') {
    if (*s2 == '\0' || to_lower(*s1) != to_lower(*s2))
      return false;
    ++s1;
    ++s2;
  }
  return *s2 == '\0';
}

void
process_options(int argc, char* argv[]) {

  bool exec_prefix_set = false;

#ifdef PPL_HAVE_GETOPT_H
struct option long_options[] = {
  {"help",              no_argument,       0, 'h'},
  {"format",            required_argument, 0, 'F'},
  {"interface",         required_argument, 0, 'I'},
  {"application",       no_argument,       0, 'A'},
  {"library",           no_argument,       0, 'L'},
  {"prefix",            optional_argument, 0, 'p'},
  {"exec-prefix",       optional_argument, 0, 'e'},
  {"configure-options", no_argument,       0, 'O'},
  {"version",           no_argument,       0, 'V'},
  {"version-major",     no_argument,       0, 'M'},
  {"version-minor",     no_argument,       0, 'N'},
  {"version-revision",  no_argument,       0, 'R'},
  {"version-beta",      no_argument,       0, 'B'},
  {"banner",            no_argument,       0, 'E'},
  {"coefficients",      no_argument,       0, 'n'},
  {"includedir",        no_argument,       0, 'i'},
  {"bindir",            no_argument,       0, 'b'},
  {"libdir",            no_argument,       0, 'l'},
  {"cppflags",          no_argument,       0, 'P'},
  {"cflags",            no_argument,       0, 'C'},
  {"cxxflags",          no_argument,       0, 'X'},
  {"ldflags",           no_argument,       0, 'D'},
  {"license",           no_argument,       0, 'g'},
  {"copying",           no_argument,       0, 'c'},
  {"bugs",              no_argument,       0, 'u'},
  {"credits",           no_argument,       0, 'r'},
  {0, 0, 0, 0}
};
#endif

  static const char* usage_string
  = "Usage: %s [OPTION]...\n"
"Displays information, in various formats, about an installation\n"
"of the Parma Polyhedra Library.\n\n"
"Options:\n"
"  -h, --help               prints this help text to stdout\n"
"  -FFMT, --format=FMT      sets the output format to FMT\n"
"                           (one of `plain', `makefile', `sh' or `csh')\n"
"  -IINT, --interface=INT   selects a library interface (one of `C++', `C',\n"
"                           `Ciao-Prolog', `GNU-Prolog', `SICStus-Prolog',\n"
"                           `SWI-Prolog', `XSB-Prolog', `YAP-Prolog',\n"
"                           `OCaml' or `Java')\n"
"  -A, --application        selects output for building an application\n"
"  -L, --library            selects output for building a library\n"
"  -p[PFX], --prefix[=PFX]  prints or sets library prefix information\n"
"  -e[PFX], --exec-prefix[=PFX]\n"
"                           prints or sets library exec-prefix information\n"
"  -O, --configure-options  prints configuration options\n"
"  -V, --version            prints version information\n"
"  -M, --version-major      prints version major number\n"
"  -N, --version-minor      prints version minor number\n"
"  -R, --version-revision   prints version revision number\n"
"  -B, --version-beta       prints version beta number\n"
"  -E, --banner             prints library banner\n"
"  -n, --coefficients       prints type of library coefficients\n"
"  -i, --includedir         prints include files directory\n"
"  -b, --bindir             prints binary executables directory\n"
"  -l, --libdir             prints library files directory\n"
"  -P, --cppflags           prints preprocessor flags\n"
"  -C, --cflags             prints C compiler flags\n"
"  -X, --cxxflags           prints C++ compiler flags\n"
"  -D, --ldflags            prints linker flags\n"
"  -g, --license            prints synthetic licensing information\n"
"  -c, --copying            prints detailed licensing information\n"
"  -u, --bugs               prints bug reporting information\n"
"  -r, --credits            prints credits\n"
#ifndef PPL_HAVE_GETOPT_H
"\n"
"NOTE: this version does not support long options.\n"
#endif
"\n"
"Report bugs to <ppl-devel@cs.unipr.it>.\n";

  while (true) {
#ifdef PPL_HAVE_GETOPT_H
    int option_index = 0;
    int c = getopt_long(argc, argv, OPTION_LETTERS, long_options,
                        &option_index);
#else
    int c = getopt(argc, argv, OPTION_LETTERS);
#endif

    if (c == EOF)
      break;

    switch (c) {
    case 0:
      break;

    case '?':
    case 'h':
      fprintf(stdout, usage_string, argv[0]);
      exit(0);
      break;

      // --format
    case 'F':
      if (strcaseeq(optarg, "plain"))
        required_format = PLAIN;
      else if (strcaseeq(optarg, "makefile"))
        required_format = MAKEFILE;
      else if (strcaseeq(optarg, "sh"))
        required_format = SH;
      else if (strcaseeq(optarg, "csh"))
        required_format = CSH;
      else
        fatal("invalid argument `%s' to --format: "
              "must be `plain', `makefile', `sh' or `csh'",
              optarg);
      break;

      // --interface
    case 'I':
      if (strcaseeq(optarg, "C++"))
        required_interface = CXX;
      else if (strcaseeq(optarg, "C"))
        required_interface = C;
      else if (strcaseeq(optarg, "Ciao-Prolog"))
        required_interface = CIAO_PROLOG;
      else if (strcaseeq(optarg, "GNU-Prolog"))
        required_interface = GNU_PROLOG;
      else if (strcaseeq(optarg, "SICStus-Prolog"))
        required_interface = SICSTUS_PROLOG;
      else if (strcaseeq(optarg, "SWI-Prolog"))
        required_interface = SWI_PROLOG;
      else if (strcaseeq(optarg, "XSB-Prolog"))
        required_interface = XSB_PROLOG;
      else if (strcaseeq(optarg, "YAP-Prolog"))
        required_interface = YAP_PROLOG;
      else if (strcaseeq(optarg, "OCaml"))
        required_interface = OCAML;
      else if (strcaseeq(optarg, "Java"))
        required_interface = JAVA;
      else
        fatal("invalid argument `%s' to --interface: "
              "must be `C++', `C', `Ciao-Prolog', `GNU-Prolog', "
              "`SICStus-Prolog', `SWI-Prolog', `XSB-Prolog', `YAP-Prolog', "
              "`OCaml' or `Java'",
              optarg);
      break;

      // --application
    case 'A':
      required_application = true;
      break;

      // --library
    case 'L':
      required_library = true;
      break;

      // --prefix
    case 'p':
      if (optarg != 0) {
        prefix = optarg;
        if (!exec_prefix_set) {
          exec_prefix = optarg;
          exec_prefix_set = true;
        }
      }
      else {
        required_prefix = true;
        ++num_required_items;
      }
      break;

      // --exec_prefix
    case 'e':
      if (optarg != 0) {
        exec_prefix = optarg;
        exec_prefix_set = true;
      }
      else {
        required_exec_prefix = true;
        ++num_required_items;
      }
      break;

      // --configure-options
    case 'O':
      required_configure_options = true;
      ++num_required_items;
      break;

      // --version
    case 'V':
      required_version = true;
      ++num_required_items;
      break;

      // --version-major
    case 'M':
      required_version_major = true;
      ++num_required_items;
      break;

      // --version-minor
    case 'N':
      required_version_minor = true;
      ++num_required_items;
      break;

      // --version-revision
    case 'R':
      required_version_revision = true;
      ++num_required_items;
      break;

      // --version-beta
    case 'B':
      required_version_beta = true;
      ++num_required_items;
      break;

      // --banner
    case 'E':
      required_banner = true;
      ++num_required_items;
      break;

      // --coefficients
    case 'n':
      required_coefficients = true;
      ++num_required_items;
      break;

      // --includedir
    case 'i':
      required_includedir = true;
      ++num_required_items;
      break;

      // --bindir
    case 'b':
      required_bindir = true;
      ++num_required_items;
      break;

      // --libdir
    case 'l':
      required_libdir = true;
      ++num_required_items;
      break;

      // --cppflags
    case 'P':
      required_cppflags = true;
      ++num_required_items;
      break;

      // --cflags
    case 'C':
      required_cflags = true;
      ++num_required_items;
      break;

      // --cxxflags
    case 'X':
      required_cxxflags = true;
      ++num_required_items;
      break;

      // --ldflags
    case 'D':
      required_ldflags = true;
      ++num_required_items;
      break;

      // --license
    case 'g':
      required_license = true;
      ++num_required_items;
      break;

      // --copying
    case 'c':
      required_copying = true;
      ++num_required_items;
      break;

      // --bugs
    case 'u':
      required_bugs = true;
      ++num_required_items;
      break;

      // --credits
    case 'r':
      required_credits = true;
      ++num_required_items;
      break;

    default:
      abort();
    }
  }

  if (argc != optind)
    // We have a spurious argument.
    fatal("no arguments besides options are accepted");

  if (required_application && required_library)
    fatal("the --application and --library are mutually exclusive");

  if (!required_application && !required_library)
    required_application = true;

  if (required_format == NO_FORMAT)
    required_format = PLAIN;

  if (required_interface == NO_INTERFACE)
    required_interface = CXX;
}

void
portray_name(const char* name) {
  const char* variable_prefix = "PPL_";
  switch (required_format) {
  case PLAIN:
    if (num_required_items > 1)
      std::cout << variable_prefix << name << ": ";
    break;
  case MAKEFILE:
    std::cout << variable_prefix << name << '=';
    break;
  case SH:
    std::cout << "export " << variable_prefix << name << '=';
    break;
  case CSH:
    std::cout << "setenv " << variable_prefix << name << ' ';
    break;
  default:
    internal_error();
  }
}

void
portray(const char* const array[]) {
  for (unsigned i = 0; array[i] != 0; ++i)
    std::cout << array[i] << std::endl;
}

void
portray(const char* string) {
  std::cout << string;
}

void
portray(long n) {
  std::cout << n;
}

void
portray(const char* name, const char* const array[]) {
  portray_name(name);
  portray(array);
  std::cout << std::endl;
}

void
portray(const char* name, const char* string) {
  portray_name(name);
  portray(string);
  std::cout << std::endl;
}

void
portray(const char* name, std::string s) {
  portray(name, s.c_str());
}

void
portray(const char* name, long n) {
  portray_name(name);
  portray(n);
  std::cout << std::endl;
}

void
replace(std::string& s,
        const std::string& pattern, const std::string& replacement) {
  std::string::size_type pos = 0;
  while (true) {
    pos = s.find(pattern, pos);
    if (pos == std::string::npos)
      break;
    s.replace(pos, pattern.size(), replacement);
    pos += replacement.length();
  }
}

void
replace_prefixes(std::string& s) {
  static const std::string prefix_reference = "${prefix}";
  static const std::string exec_prefix_reference = "${exec_prefix}";
  replace(s, prefix_reference, prefix);
  replace(s, exec_prefix_reference, exec_prefix);
}

void
portray_with_prefixes(const char* name, std::string s) {
  replace_prefixes(s);
  portray(name, s);
}

} // namespace

int
main(int argc, char* argv[]) try {
  program_name = argv[0];

  if (strcmp(PPL_VERSION, PPL::version()) != 0)
    fatal("was compiled with PPL version %s, but linked with version %s",
          PPL_VERSION, PPL::version());

  // Initialize prefixes.
  prefix = "@prefix@";
  exec_prefix = "@exec_prefix@";
  replace_prefixes(prefix);
  replace_prefixes(exec_prefix);

  // Process command line options.
  process_options(argc, argv);

  if (required_prefix)
    portray("PREFIX", prefix);

  if (required_exec_prefix)
    portray("EXEC_PREFIX", exec_prefix);

  if (required_configure_options)
    portray("CONFIGURE_OPTIONS", PPL_CONFIGURE_OPTIONS);

  if (required_version)
    portray("VERSION", PPL_VERSION);

  if (required_version_major)
    portray("VERSION_MAJOR", static_cast<long>(PPL_VERSION_MAJOR));

  if (required_version_minor)
    portray("VERSION_MINOR", static_cast<long>(PPL_VERSION_MINOR));

  if (required_version_revision)
    portray("VERSION_REVISION", static_cast<long>(PPL_VERSION_REVISION));

  if (required_version_beta)
    portray("VERSION_BETA", static_cast<long>(PPL_VERSION_BETA));

  if (required_banner)
    portray("BANNER", PPL::banner());

  if (required_coefficients)
    portray("COEFFICIENTS", "@coefficient_mnemonic@");

  if (required_includedir)
    portray_with_prefixes("INCLUDEDIR", "@includedir@");

  if (required_bindir)
    portray_with_prefixes("BINDIR", "@bindir@");

  if (required_libdir)
    portray_with_prefixes("LIBDIR", "@libdir@");

  if (required_cppflags) {
    if (required_application) {
      std::string cppflags = "@CPPFLAGS@";
      std::string s = "@includedir@";
      replace_prefixes(s);
      // `/usr/include' is the standard include directory:
      // thus it needs not be specified.
      if (s == "/usr/include")
        s = cppflags;
      else {
        s = "-I" + s;
        // Avoid duplicating the -I options.
        if (cppflags.find(s) != std::string::npos)
          s = "";
        if (s.length() > 0 && strlen("@CPPFLAGS@") > 0)
          s += ' ';
        s += "@CPPFLAGS@";
      }
      if (s.length() > 0 && strlen("@extra_includes@") > 0)
          s += ' ';
      s += "@extra_includes@";
      portray("CPPFLAGS", s);
    }
    else
      portray("CPPFLAGS", "@CPPFLAGS@");
  }

  if (required_cflags)
    portray("CFLAGS", "@CFLAGS@");

  if (required_cxxflags)
    portray("CXXFLAGS", "@CXXFLAGS@");

  if (required_ldflags) {
    std::string s = "@libdir@";
    replace_prefixes(s);
    const std::string ldflags = "@LDFLAGS@";
    // `/usr/lib' is the standard library directory:
    // thus it needs not be specified.
    if (s == "/usr/lib")
      s = ldflags;
    else {
      s = "-L" + s;
      // Avoid duplicating the -L options.
      if (ldflags.find(s) != std::string::npos)
        s = "";
      if (s.length() > 0 && ldflags.length() > 0)
        s += ' ';
      s += ldflags;
    }
    if (required_library) {
      if (s.length() > 0 && strlen("@extra_libraries@") > 0)
        s += ' ';
      s += "@extra_libraries@";
    }
    else {
      assert(required_application);
      if (s.length() > 0)
        s += ' ';
      s += "-lppl";
      if (required_interface == C)
        s += " -lppl_c";
      s += " -lgmpxx -lgmp";
    }
    portray("LDFLAGS", s);
  }

  if (required_license)
    portray("LICENSE", PPL_LICENSE);

  if (required_copying)
    portray("COPYING", COPYING_array);

  if (required_bugs)
    portray("BUGS", BUGS_array);

  if (required_credits)
    portray("CREDITS", CREDITS_array);

  return 0;
}
catch (const std::bad_alloc&) {
  fatal("out of memory");
  exit(1);
}
catch (const std::overflow_error& e) {
  fatal("arithmetic overflow (%s)", e.what());
  exit(1);
}
catch (...) {
  internal_error();
}