/* GNU mailutils - a suite of utilities for electronic mail
   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Library Public License as published by
   the Free Software Foundation; either version 2, 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 Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

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

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>

#include <mailutils/argcv.h>
#include <mailutils/libsieve.h>
#include <mailutils/argp.h>
#include <mailutils/auth.h>
#include <mailutils/errno.h>
#include <mailutils/folder.h>
#include <mailutils/list.h>
#include <mailutils/mailbox.h>
#include <mailutils/mutil.h>
#include <mailutils/registrar.h>
#include <mailutils/stream.h>

void mutil_register_all_mbox_formats (void);

const char *argp_program_version = "sieve (" PACKAGE_STRING ")";

static char doc[] =
"GNU sieve -- a mail filtering tool\n"
"\v"
"Debug flags:\n"
"  g - main parser traces\n"
"  T - mailutil traces (MU_DEBUG_TRACE)\n"
"  P - network protocols (MU_DEBUG_PROT)\n"
"  t - sieve trace (MU_SIEVE_DEBUG_TRACE)\n"
"  i - sieve instructions trace (MU_SIEVE_DEBUG_INSTR)\n";

#define D_DEFAULT "TPt"

static struct argp_option options[] =
{
  {"no-actions", 'n', 0, 0,
   "No actions executed, just print what would be done", 0},

  {"keep-going", 'k', 0, 0,
   "Keep on going if execution fails on a message", 0},

  {"compile-only", 'c', 0, 0,
   "Compile script and exit", 0},

  {"dump", 'D', 0, 0,
   "Compile script, dump disasembled sieve code on terminal and exit", 0 },
  
  {"mbox-url", 'f', "MBOX", 0,
   "Mailbox to sieve (defaults to user's mail spool)", 0},

  {"ticket", 't', "TICKET", 0,
   "Ticket file for mailbox authentication", 0},

  {"mailer-url", 'M', "MAILER", 0,
   "Mailer URL (defaults to \"sendmail:\"). Use `--mailer-url none' to disable creating the mailer (it will disable reject and redirect actions as well)", 0},

  {"debug", 'd', "FLAGS", OPTION_ARG_OPTIONAL,
   "Debug flags (defaults to \"" D_DEFAULT "\")", 0},

  {"verbose", 'v', NULL, 0,
   "Log all actions", 0},
  
  {"email", 'e', "ADDRESS", 0,
   "Override user email address", 0},
  
  {0}
};

struct options {
  int keep_going;
  int compile_only;
  char *mbox;
  char *tickets;
  int debug_level;
  int sieve_debug;
  int verbose;
  char *mailer;
  char *script;
};

static error_t
parser (int key, char *arg, struct argp_state *state)
{
  struct options *opts = state->input;
  int rc;
  
  switch (key)
    {
    case ARGP_KEY_INIT:
      if (!opts->tickets)
	opts->tickets = mu_tilde_expansion ("~/.tickets", "/", NULL);
      if (!opts->mailer)
	opts->mailer = strdup ("sendmail:");
      if (!opts->debug_level)
	opts->debug_level = MU_DEBUG_ERROR;
      log_facility = 0;
      break;

    case 'e':
      rc = mu_set_user_email (arg);
      if (rc)
	argp_error (state, "invalid email: %s", mu_errstring (rc));
      break;
      
    case 'n':
      opts->sieve_debug |= MU_SIEVE_DRY_RUN;
      break;

    case 'k':
      opts->keep_going = 1;
      break;

    case 'c':
      opts->compile_only = 1;
      break;

    case 'D':
      opts->compile_only = 2;
      break;
      
    case 'f':
      if (opts->mbox)
	argp_error (state, "only one MBOX can be specified");
      opts->mbox = strdup (arg);
      break;
      
    case 't':
      free (opts->tickets);
      opts->tickets = mu_tilde_expansion (arg, "/", NULL);
      break;
      
    case 'M':
      free (opts->mailer);
      opts->mailer = strdup (arg);
      break;
      
    case 'd':
      if (!arg)
	arg = D_DEFAULT;
      for (; *arg; arg++)
	{
	  switch (*arg)
	    {
	    case 'T':
	      opts->debug_level |= MU_DEBUG_TRACE;
	      break;

	    case 'P':
	      opts->debug_level |= MU_DEBUG_PROT;
	      break;

	    case 'g':
	      sieve_yydebug = 1;
	      break;

	    case 't':
	      opts->sieve_debug |= MU_SIEVE_DEBUG_TRACE;
	      break;
	      
	    case 'i':
	      opts->sieve_debug |= MU_SIEVE_DEBUG_INSTR;
	      break;
	      
	    default:
	      argp_error (state, "%c is not a valid debug flag", *arg);
	      break;
	    }
	}
      break;

    case 'v':
      opts->verbose = 1;
      break;
      
    case ARGP_KEY_ARG:
      if (opts->script)
	argp_error (state, "only one SCRIPT can be specified");
      opts->script = mu_tilde_expansion (arg, "/", NULL);
      break;

    case ARGP_KEY_NO_ARGS:
      argp_error (state, "SCRIPT must be specified");

    default:
      return ARGP_ERR_UNKNOWN;
    }

  return 0;
}

static struct argp argp =
{
  options,
  parser,
  "SCRIPT",
  doc
};

static const char *sieve_argp_capa[] =
{
  "common",
  "mailbox",
  "license",
  "logging",
  NULL
};

static int
sieve_stderr_debug_printer (void *unused, const char *fmt, va_list ap)
{
  vfprintf (stderr, fmt, ap);
  return 0;
}

static int
sieve_syslog_debug_printer (void *unused, const char *fmt, va_list ap)
{
  vsyslog (LOG_DEBUG, fmt, ap);
  return 0;
}

static int
stderr_debug_print (mu_debug_t unused, size_t level, const char *fmt,
		    va_list ap)
{
  vfprintf ((level == MU_DEBUG_ERROR) ? stderr : stdout, fmt, ap);
  return 0;
}

static int
syslog_debug_print (mu_debug_t unused, size_t level, const char *fmt,
		    va_list ap)
{
  vsyslog ((level == MU_DEBUG_ERROR) ? LOG_ERR : LOG_DEBUG, fmt, ap);
  return 0;
}

static void
stdout_action_log (void *unused,
		   const char *script, size_t msgno, message_t msg,
		   const char *action, const char *fmt, va_list ap)
{
  size_t uid = 0;

  message_get_uid (msg, &uid);

  fprintf (stdout, "%s on msg uid %d", action, uid);
  if (fmt && strlen (fmt))
    {
      fprintf (stdout, ": ");
      vfprintf (stdout, fmt, ap);
    }
  fprintf (stdout, "\n");
}

static void
syslog_action_log (void *unused,
		   const char *script, size_t msgno, message_t msg,
		   const char *action, const char *fmt, va_list ap)
{
  size_t uid = 0;
  char *text = NULL;
  
  message_get_uid (msg, &uid);

  asprintf (&text, "%s on msg uid %d", action, uid);
  if (fmt && strlen (fmt))
    {
      char *diag = NULL;
      asprintf (&diag, fmt, ap);
      syslog (LOG_NOTICE, "%s: %s", text, diag);
      free (diag);
    }
  else
    syslog (LOG_NOTICE, "%s", text);
  free (text);
}

int
main (int argc, char *argv[])
{
  sieve_machine_t mach;
  wicket_t wicket = 0;
  ticket_t ticket = 0;
  mu_debug_t debug = 0;
  mailer_t mailer = 0;
  mailbox_t mbox = 0;
  int rc;
  struct options opts = {0};
  int (*debugfp) __P ((mu_debug_t, size_t level, const char *, va_list));
    
  rc = mu_argp_parse (&argp, &argc, &argv, ARGP_IN_ORDER, sieve_argp_capa,
		      0, &opts);

  if (rc)
    return 1;

  mutil_register_all_mbox_formats ();

  /* Sieve interpreter setup. */
  rc = sieve_machine_init (&mach, NULL);
  if (rc)
    {
      mu_error ("can't initialize sieve machine: %s", mu_errstring (rc));
      return 1;
    }

  if (log_facility)
    {
      openlog ("sieve", LOG_PID, log_facility);
      mu_error_set_print (mu_syslog_error_printer);
      sieve_set_debug (mach, sieve_syslog_debug_printer);
      if (opts.verbose)
	sieve_set_logger (mach, syslog_action_log);
      debugfp = syslog_debug_print;
    }
  else
    {
      sieve_set_debug (mach, sieve_stderr_debug_printer);
      if (opts.verbose)
	sieve_set_logger (mach, stdout_action_log);
      debugfp = stderr_debug_print;
    }
  
  rc = sieve_compile (mach, opts.script);
  if (rc)
    return 1;

  /* We can finish if its only a compilation check. */
  if (opts.compile_only)
    {
      if (opts.compile_only == 2)
	sieve_disass (mach);
      return 0;
    }

  /* Create a ticket, if we can. */
  if (opts.tickets)
    {
      if ((rc = wicket_create (&wicket, opts.tickets)) != 0)
	{
	  mu_error ("wicket create <%s> failed: %s\n",
		   opts.tickets, mu_errstring (rc));
	  goto cleanup;
	}
      if ((rc = wicket_get_ticket (wicket, &ticket, 0, 0)) != 0)
	{
	  mu_error ("ticket get failed: %s\n", mu_errstring (rc));
	  goto cleanup;
	}
      sieve_set_ticket (mach, ticket);
    }

  /* Create a debug object, if needed. */
  if (opts.debug_level)
    {
      if ((rc = mu_debug_create (&debug, mach)))
	{
	  mu_error ("mu_debug_create failed: %s\n", mu_errstring (rc));
	  goto cleanup;
	}
      if ((rc = mu_debug_set_level (debug, opts.debug_level)))
	{
	  mu_error ("mu_debug_set_level failed: %s\n",
		    mu_errstring (rc));
	  goto cleanup;
	}
      if ((rc = mu_debug_set_print (debug, debugfp, mach)))
	{
	  mu_error ("mu_debug_set_print failed: %s\n",
		    mu_errstring (rc));
	  goto cleanup;
	}
    }
  
  sieve_set_debug_level (mach, debug, opts.sieve_debug);
    
  /* Create a mailer. */
  if (strcmp (opts.mailer, "none"))
    {
      if ((rc = mailer_create (&mailer, opts.mailer)))
	{
	  mu_error ("mailer create <%s> failed: %s\n",
		   opts.mailer, mu_errstring (rc));
	  goto cleanup;
	}
      if (debug && (rc = mailer_set_debug (mailer, debug)))
	{
	  mu_error ("mailer_set_debug failed: %s\n",
		   mu_errstring (rc));
	  goto cleanup;
	}
      sieve_set_mailer (mach, mailer);
    }
  /* Create, give a ticket to, and open the mailbox. */
  if ((rc = mailbox_create_default (&mbox, opts.mbox)) != 0)
    {
      mu_error ("mailbox create <%s> failed: %s\n",
	       opts.mbox ? opts.mbox : "default", mu_errstring (rc));
      goto cleanup;
    }

  if (debug && (rc = mailbox_set_debug (mbox, debug)))
    {
      mu_error ("mailbox_set_debug failed: %s\n", mu_errstring (rc));
      goto cleanup;
    }

  if (ticket)
    {
      folder_t folder = NULL;
      authority_t auth = NULL;

      if ((rc = mailbox_get_folder (mbox, &folder)))
	{
	  mu_error ("mailbox_get_folder failed: %s",
		   mu_errstring (rc));
	  goto cleanup;
	}

      if ((rc = folder_get_authority (folder, &auth)))
	{
	  mu_error ("folder_get_authority failed: %s",
		   mu_errstring (rc));
	  goto cleanup;
	}

      /* Authentication-less folders don't have authorities. */
      if (auth && (rc = authority_set_ticket (auth, ticket)))
	{
	  mu_error ("authority_set_ticket failed: %s",
		   mu_errstring (rc));
	  goto cleanup;
	}
    }

  /* Open the mailbox read-only if we aren't going to modify it. */
  if (opts.sieve_debug & MU_SIEVE_DRY_RUN)
    rc = mailbox_open (mbox, MU_STREAM_READ);
  else
    rc = mailbox_open (mbox, MU_STREAM_RDWR);

  if (rc != 0)
    {
      mu_error ("open on %s failed: %s\n",
	       opts.mbox ? opts.mbox : "default", mu_errstring (rc));
      goto cleanup;
    }

  /* Process the mailbox */
  rc = sieve_mailbox (mach, mbox);
  if (rc)
    {
      goto cleanup;
    }

cleanup:
  if (mbox && !(opts.sieve_debug & MU_SIEVE_DRY_RUN))
    {
      int e;

      /* A message won't be marked deleted unless the script executed
         succesfully on it, so we always do an expunge, it will delete
         any messages that were marked DELETED even if execution failed
         on a later message. */
      if ((e = mailbox_expunge (mbox)) != 0)
	mu_error ("expunge on %s failed: %s\n",
		  opts.mbox ? opts.mbox : "default", mu_errstring (e));

      if (e && !rc)
	rc = e;
    }

  mailbox_close (mbox);
  mailbox_destroy (&mbox);
  mu_debug_destroy (&debug, mach);

  return rc ? 1 : 0;
}

void
mutil_register_all_mbox_formats (void)
{
  list_t bookie = 0;
  registrar_get_list (&bookie);
  list_append (bookie, path_record);
  list_append (bookie, file_record);
  list_append (bookie, mbox_record);
  list_append (bookie, pop_record);
  list_append (bookie, imap_record);
  list_append (bookie, mh_record);
  list_append (bookie, sendmail_record);
  list_append (bookie, smtp_record);
}