/* Writing C# .resources files.
   Copyright (C) 2003-2005, 2007-2009, 2010-2011, 2016, 2020 Free Software
   Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2003.

   This program 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.

   This program 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, see <https://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include "write-resources.h"

#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "error.h"
#include "xerror.h"
#include "relocatable.h"
#include "csharpexec.h"
#include "spawn-pipe.h"
#include "wait-process.h"
#include "message.h"
#include "msgfmt.h"
#include "msgl-iconv.h"
#include "msgl-header.h"
#include "po-charset.h"
#include "xalloc.h"
#include "concat-filename.h"
#include "fwriteerror.h"
#include "gettext.h"

#define _(str) gettext (str)


/* A .resources file has such a complex format that it's most easily generated
   through the C# class ResourceWriter.  So we start a C# process to execute
   the WriteResource program, sending it the msgid/msgstr pairs as
   NUL-terminated UTF-8 encoded strings.  */

struct locals
{
  /* IN */
  message_list_ty *mlp;
};

static bool
execute_writing_input (const char *progname,
                       const char *prog_path, const char * const *prog_argv,
                       void *private_data)
{
  struct locals *l = (struct locals *) private_data;
  pid_t child;
  int fd[1];
  FILE *fp;
  int exitstatus;

  /* Open a pipe to the C# execution engine.  */
  child = create_pipe_out (progname, prog_path, prog_argv, NULL,
                           NULL, false, true, true, fd);

  fp = fdopen (fd[0], "wb");
  if (fp == NULL)
    error (EXIT_FAILURE, errno, _("fdopen() failed"));

  /* Write the message list.  */
  {
    message_list_ty *mlp = l->mlp;
    size_t j;

    for (j = 0; j < mlp->nitems; j++)
      {
        message_ty *mp = mlp->item[j];

        fwrite (mp->msgid, 1, strlen (mp->msgid) + 1, fp);
        fwrite (mp->msgstr, 1, strlen (mp->msgstr) + 1, fp);
      }
  }

  if (fwriteerror (fp))
    error (EXIT_FAILURE, 0, _("error while writing to %s subprocess"),
           progname);

  /* Remove zombie process from process list, and retrieve exit status.  */
  /* He we can ignore SIGPIPE because WriteResource either writes to a file
     - then it never gets SIGPIPE - or to standard output, and in the latter
     case it has no side effects other than writing to standard output.  */
  exitstatus =
    wait_subprocess (child, progname, true, false, true, true, NULL);
  if (exitstatus != 0)
    error (EXIT_FAILURE, 0, _("%s subprocess failed with exit code %d"),
           progname, exitstatus);

  return false;
}

int
msgdomain_write_csharp_resources (message_list_ty *mlp,
                                  const char *canon_encoding,
                                  const char *domain_name,
                                  const char *file_name)
{
  /* If no entry for this domain don't even create the file.  */
  if (mlp->nitems != 0)
    {
      /* Determine whether mlp has entries with context.  */
      {
        bool has_context;
        size_t j;

        has_context = false;
        for (j = 0; j < mlp->nitems; j++)
          if (mlp->item[j]->msgctxt != NULL)
            has_context = true;
        if (has_context)
          {
            multiline_error (xstrdup (""),
                             xstrdup (_("\
message catalog has context dependent translations\n\
but the C# .resources format doesn't support contexts\n")));
            return 1;
          }
      }

      /* Determine whether mlp has plural entries.  */
      {
        bool has_plural;
        size_t j;

        has_plural = false;
        for (j = 0; j < mlp->nitems; j++)
          if (mlp->item[j]->msgid_plural != NULL)
            has_plural = true;
        if (has_plural)
          {
            multiline_error (xstrdup (""),
                             xstrdup (_("\
message catalog has plural form translations\n\
but the C# .resources format doesn't support plural handling\n")));
            return 1;
          }
      }

      /* Convert the messages to Unicode.  */
      iconv_message_list (mlp, canon_encoding, po_charset_utf8, NULL);

      /* Support for "reproducible builds": Delete information that may vary
         between builds in the same conditions.  */
      message_list_delete_header_field (mlp, "POT-Creation-Date:");

      /* Execute the WriteResource program.  */
      {
        const char *args[2];
        const char *gettextexedir;
        char *assembly_path;
        struct locals locals;

        /* Prepare arguments.  */
        args[0] = file_name;
        args[1] = NULL;

        /* Make it possible to override the .exe location.  This is
           necessary for running the testsuite before "make install".  */
        gettextexedir = getenv ("GETTEXTCSHARPEXEDIR");
        if (gettextexedir == NULL || gettextexedir[0] == '\0')
          gettextexedir = relocate (LIBDIR "/gettext");

        assembly_path =
          xconcatenated_filename (gettextexedir, "msgfmt.net", ".exe");

        locals.mlp = mlp;

        if (execute_csharp_program (assembly_path, NULL, 0,
                                    args,
                                    verbose > 0, false,
                                    execute_writing_input, &locals))
          /* An error message should already have been provided.  */
          exit (EXIT_FAILURE);

        free (assembly_path);
      }
    }

  return 0;
}