/* status.c - Status message and command-fd interface 
 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
 *               2004, 2005, 2006 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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.
 *
 * GnuPG 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 <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>

#include "gpg.h"
#include "util.h"
#include "status.h"
#include "ttyio.h"
#include "options.h"
#include "main.h"
#include "i18n.h"
#include "cipher.h" /* for progress functions */

#define CONTROL_D ('D' - 'A' + 1)



static FILE *statusfp;


static void
progress_cb (void *ctx, const char *what, int printchar,
             int current, int total)
{
  char buf[50];

  (void)ctx;

  if ( printchar == '\n' && !strcmp (what, "primegen") )
    snprintf (buf, sizeof buf -1, "%.20s X 100 100", what );
  else
    snprintf (buf, sizeof buf -1, "%.20s %c %d %d",
              what, printchar=='\n'?'X':printchar, current, total );
  write_status_text (STATUS_PROGRESS, buf);
}


/* Return true if the status message NO may currently be issued.  We
   need this to avoid syncronisation problem while auto retrieving a
   key.  There it may happen that a status NODATA is issued for a non
   available key and the user may falsely interpret this has a missing
   signature. */
static int
status_currently_allowed (int no)
{
  if (!glo_ctrl.in_auto_key_retrieve)
    return 1; /* Yes. */

  /* We allow some statis anyway, so that import statistics are
     correct and to avoid problems if the retriebval subsystem will
     prompt the user. */
  switch (no)
    {
    case STATUS_GET_BOOL:	 
    case STATUS_GET_LINE:	 
    case STATUS_GET_HIDDEN:	 
    case STATUS_GOT_IT:	 
    case STATUS_IMPORTED:
    case STATUS_IMPORT_OK:	
    case STATUS_IMPORT_CHECK:  
    case STATUS_IMPORT_RES:
      return 1; /* Yes. */
    default:
      break;
    }
  return 0; /* No. */
}


void
set_status_fd ( int fd )
{
    static int last_fd = -1;

    if ( fd != -1 && last_fd == fd )
        return;

    if ( statusfp && statusfp != stdout && statusfp != stderr )
        fclose (statusfp);
    statusfp = NULL;
    if ( fd == -1 ) 
        return;

    if( fd == 1 )
	statusfp = stdout;
    else if( fd == 2 )
	statusfp = stderr;
    else
	statusfp = fdopen( fd, "w" );
    if( !statusfp ) {
	log_fatal("can't open fd %d for status output: %s\n",
                  fd, strerror(errno));
    }
    last_fd = fd;

    gcry_set_progress_handler ( progress_cb, NULL );
}

int
is_status_enabled()
{
    return !!statusfp;
}

void
write_status ( int no )
{
    write_status_text( no, NULL );
}

void
write_status_text ( int no, const char *text)
{
    if( !statusfp || !status_currently_allowed (no) )
	return;  /* Not enabled or allowed. */

    fputs ( "[GNUPG:] ", statusfp );
    fputs ( get_status_string (no), statusfp );
    if( text ) {
        putc ( ' ', statusfp );
        for (; *text; text++) {
            if (*text == '\n')
                fputs ( "\\n", statusfp );
            else if (*text == '\r')
                fputs ( "\\r", statusfp );
            else 
                putc ( *(const byte *)text,  statusfp );
        }
    }
    putc ('\n',statusfp);
    if ( fflush (statusfp) && opt.exit_on_status_write_error )
      g10_exit (0);
}


void
write_status_error (const char *where, int errcode)
{
  if (!statusfp || !status_currently_allowed (STATUS_ERROR))
    return;  /* Not enabled or allowed. */

  fprintf (statusfp, "[GNUPG:] %s %s %u\n", 
           get_status_string (STATUS_ERROR), where, gpg_err_code (errcode));
  if (fflush (statusfp) && opt.exit_on_status_write_error)
    g10_exit (0);
}


/*
 * Write a status line with a buffer using %XX escapes.  If WRAP is >
 * 0 wrap the line after this length.  If STRING is not NULL it will
 * be prepended to the buffer, no escaping is done for string.
 * A wrap of -1 forces spaces not to be encoded as %20.
 */
void
write_status_text_and_buffer ( int no, const char *string,
                               const char *buffer, size_t len, int wrap )
{
    const char *s, *text;
    int esc, first;
    int lower_limit = ' ';
    size_t n, count, dowrap;

    if( !statusfp || !status_currently_allowed (no) )
	return;  /* Not enabled or allowed. */
    
    if (wrap == -1) {
        lower_limit--;
        wrap = 0;
    }

    text = get_status_string (no);
    count = dowrap = first = 1;
    do {
        if (dowrap) {
            fprintf (statusfp, "[GNUPG:] %s ", text );
            count = dowrap = 0;
            if (first && string) {
                fputs (string, statusfp);
                count += strlen (string);
            }
            first = 0;
        }
        for (esc=0, s=buffer, n=len; n && !esc; s++, n-- ) {
            if ( *s == '%' || *(const byte*)s <= lower_limit 
                           || *(const byte*)s == 127 ) 
                esc = 1;
            if ( wrap && ++count > wrap ) {
                dowrap=1;
                break;
            }
        }
        if (esc) {
            s--; n++;
        }
        if (s != buffer) 
            fwrite (buffer, s-buffer, 1, statusfp );
        if ( esc ) {
            fprintf (statusfp, "%%%02X", *(const byte*)s );
            s++; n--;
        }
        buffer = s;
        len = n;
        if ( dowrap && len )
            putc ( '\n', statusfp );
    } while ( len );

    putc ('\n',statusfp);
    if ( fflush (statusfp) && opt.exit_on_status_write_error )
      g10_exit (0);
}

void
write_status_buffer ( int no, const char *buffer, size_t len, int wrap )
{
    write_status_text_and_buffer (no, NULL, buffer, len, wrap);
}


/* Print the BEGIN_SIGNING status message.  If MD is not NULL it is
   used to retrieve the hash algorithms used for the message. */
void
write_status_begin_signing (gcry_md_hd_t md)
{
  if (md)
    {
      char buf[100];
      size_t buflen;
      int i;
      
      /* We use a hard coded list of possible algorithms.  Using other
         algorithms than specified by OpenPGP does not make sense
         anyway.  We do this out of performance reasons: Walking all
         the 110 allowed Ids is not a good idea given the way the
         check is implemented in libgcrypt.  Recall that the only use
         of this status code is to create the micalg algorithm for
         PGP/MIME. */
      buflen = 0;
      for (i=1; i <= 11; i++)
        if (i < 4 || i > 7)
          if ( gcry_md_is_enabled (md, i) && buflen < DIM(buf) )
            {
              snprintf (buf+buflen, DIM(buf) - buflen - 1, 
                        "%sH%d", buflen? " ":"",i);
              buflen += strlen (buf+buflen);
            }
      write_status_text ( STATUS_BEGIN_SIGNING, buf );
    }
  else
    write_status ( STATUS_BEGIN_SIGNING );
}


static int
myread(int fd, void *buf, size_t count)
{
    int rc;
    do {
        rc = read( fd, buf, count );
    } while ( rc == -1 && errno == EINTR );
    if ( !rc && count ) {
        static int eof_emmited=0;
        if ( eof_emmited < 3 ) {
            *(char*)buf = CONTROL_D;
            rc = 1;
            eof_emmited++;
        }
        else { /* Ctrl-D not caught - do something reasonable */
#ifdef HAVE_DOSISH_SYSTEM
            raise (SIGINT);  /* nothing to hangup under DOS */
#else
            raise (SIGHUP); /* no more input data */
#endif
        }
    }    
    return rc;
}



/* Request a string from the client over the command-fd.  If GETBOOL
   is set the function returns a static string (do not free) if the
   netered value was true or NULL if the entered value was false.  */
static char *
do_get_from_fd ( const char *keyword, int hidden, int getbool )
{
  int i, len;
  char *string;
  
  if (statusfp != stdout)
    fflush (stdout);
  
  write_status_text (getbool? STATUS_GET_BOOL :
                     hidden? STATUS_GET_HIDDEN : STATUS_GET_LINE, keyword);

  for (string = NULL, i = len = 200; ; i++ ) 
    {
      if (i >= len-1 ) 
        {
          char *save = string;
          len += 100;
          string = hidden? xmalloc_secure ( len ) : xmalloc ( len );
          if (save)
            memcpy (string, save, i );
          else
            i = 0;
	}
      /* Fixme: why not use our read_line function here? */
      if ( myread( opt.command_fd, string+i, 1) != 1 || string[i] == '\n'  )
        break;
      else if ( string[i] == CONTROL_D ) 
        {
          /* Found ETX - Cancel the line and return a sole ETX.  */
          string[0] = CONTROL_D;
          i = 1;
          break;
        }
    }
  string[i] = 0;

  write_status (STATUS_GOT_IT);

  if (getbool)	 /* Fixme: is this correct??? */
    return (string[0] == 'Y' || string[0] == 'y') ? "" : NULL;

  return string;
}



int
cpr_enabled()
{
    if( opt.command_fd != -1 )
	return 1;
    return 0;
}

char *
cpr_get_no_help( const char *keyword, const char *prompt )
{
    char *p;

    if( opt.command_fd != -1 )
	return do_get_from_fd ( keyword, 0, 0 );
    for(;;) {
	p = tty_get( prompt );
        return p;
    }
}

char *
cpr_get( const char *keyword, const char *prompt )
{
    char *p;

    if( opt.command_fd != -1 )
	return do_get_from_fd ( keyword, 0, 0 );
    for(;;) {
	p = tty_get( prompt );
	if( *p=='?' && !p[1] && !(keyword && !*keyword)) {
	    xfree(p);
	    display_online_help( keyword );
	}
	else
	    return p;
    }
}


char *
cpr_get_utf8( const char *keyword, const char *prompt )
{
    char *p;
    p = cpr_get( keyword, prompt );
    if( p ) {
	char *utf8 = native_to_utf8( p );
	xfree( p );
	p = utf8;
    }
    return p;
}

char *
cpr_get_hidden( const char *keyword, const char *prompt )
{
    char *p;

    if( opt.command_fd != -1 )
	return do_get_from_fd ( keyword, 1, 0 );
    for(;;) {
	p = tty_get_hidden( prompt );
	if( *p == '?' && !p[1] ) {
	    xfree(p);
	    display_online_help( keyword );
	}
	else
	    return p;
    }
}

void
cpr_kill_prompt(void)
{
    if( opt.command_fd != -1 )
	return;
    tty_kill_prompt();
    return;
}

int
cpr_get_answer_is_yes( const char *keyword, const char *prompt )
{
    int yes;
    char *p;

    if( opt.command_fd != -1 )
	return !!do_get_from_fd ( keyword, 0, 1 );
    for(;;) {
	p = tty_get( prompt );
	trim_spaces(p); /* it is okay to do this here */
	if( *p == '?' && !p[1] ) {
	    xfree(p);
	    display_online_help( keyword );
	}
	else {
	    tty_kill_prompt();
	    yes = answer_is_yes(p);
	    xfree(p);
	    return yes;
	}
    }
}

int
cpr_get_answer_yes_no_quit( const char *keyword, const char *prompt )
{
    int yes;
    char *p;

    if( opt.command_fd != -1 )
	return !!do_get_from_fd ( keyword, 0, 1 );
    for(;;) {
	p = tty_get( prompt );
	trim_spaces(p); /* it is okay to do this here */
	if( *p == '?' && !p[1] ) {
	    xfree(p);
	    display_online_help( keyword );
	}
	else {
	    tty_kill_prompt();
	    yes = answer_is_yes_no_quit(p);
	    xfree(p);
	    return yes;
	}
    }
}


int
cpr_get_answer_okay_cancel (const char *keyword,
                            const char *prompt,
                            int def_answer)
{
  int yes;
  char *answer = NULL;
  char *p;

  if( opt.command_fd != -1 )
    answer = do_get_from_fd ( keyword, 0, 0 );

  if (answer)
    {
      yes = answer_is_okay_cancel (answer, def_answer);
      xfree (answer);
      return yes;
    }

  for(;;)
    {
      p = tty_get( prompt );
      trim_spaces(p); /* it is okay to do this here */
      if (*p == '?' && !p[1])
        {
          xfree(p);
          display_online_help (keyword);
	}
      else
        {
          tty_kill_prompt();
          yes = answer_is_okay_cancel (p, def_answer);
          xfree(p);
          return yes;
	}
    }
}