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/* This file is part of tagr.
   Copyright (C) 2000, 2005, 2009 Max Bouglacoff, Sergey Poznyakoff

   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, 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 <http://www.gnu.org/licenses/>. */

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

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <syslog.h>
#define obstack_chunk_alloc malloc
#define obstack_chunk_free free
#include <obstack.h>
#include <c-strcase.h>
#include <tagr.h>

#define ARG_UNUSED __attribute__ ((__unused__))

static struct obstack mon_stack;
static struct monitor *mon_base;
static size_t mon_count;

static struct obstack pp_cmd_stack;
static int pp_cmd_stack_init;

struct monitor *
find_monitor (const char *name)
{
  struct monitor *mon;
  
  for (mon = mon_base; mon < mon_base + mon_count; mon++)
    if (strcmp (mon->name, name) == 0)
      return mon;
  return NULL; 
}

struct monitor *
find_monitor_id (const char *id)
{
  struct monitor *mon;

  for (mon = mon_base; mon < mon_base + mon_count; mon++)
    if (strcmp (mon->id, id) == 0)
      return mon;
  return NULL; 
}

void
free_monitors ()
{
  struct monitor *mon;
  
  for (mon = mon_base; mon < mon_base + mon_count; mon++)
    {
      free (mon->id);
      free (mon->name);
      free (mon->dir);
    }
  obstack_free (&mon_stack, mon_base);
  mon_count = 0;
}


static int
cb_monitor (enum grecs_callback_command cmd,
	   grecs_locus_t *locus,
	   void *varptr,
	   grecs_value_t *value,
	   void *cb_data)
{
  int rc;
  struct monitor *mon;
  void **pdata = cb_data;
  
  switch (cmd)
    {
    case grecs_callback_section_begin:
      if (!value
	  || value->type != GCONF_TYPE_STRING
	  || value->v.string == NULL)
	{
	  grecs_error (locus, 0, _("tag must be a string"));
	  return 1;
	}
      mon = xzalloc (sizeof (*mon));
      *mon = default_monitor;
      mon->id = strdup (value->v.string);
      mon->name = NULL;
      mon->dir = NULL;
      *pdata = mon;
      break;

    case grecs_callback_section_end:
      mon = *pdata;
      if (strcmp (mon->id, "default") == 0)
	default_monitor = *mon;
      else
	{
	  if (mon->max_rate == 0 && mon->max_adjust == 0)
	    {
	      grecs_error (locus, 0, _("maximum speed not set"));
	      free (mon);
	      return 0;
	    }
	  if (!mon->name)
	    mon->name = strdup (mon->id);
	  if (!mon->dir)
	    mon->dir = strdup (mon->id);
	  if (mon_count == 0)
	    obstack_init (&mon_stack);

	  obstack_grow (&mon_stack, mon, sizeof *mon);
	  mon_count++;
	}
      free (mon);
      *pdata = NULL;
      break;

    case grecs_callback_set_value:
      grecs_error (locus, 0, _("invalid use of block statement"));
  }
  return 0;
}

static int
cb_double (enum grecs_callback_command cmd,
	   grecs_locus_t *locus,
	   void *varptr,
	   grecs_value_t *value,
	   void *cb_data)
{
  double d, *dptr = varptr;
  char *p;
  
  if (cmd != grecs_callback_set_value)
    {
      grecs_error (locus, 0, _("unexpected block statement"));
      return 1;
    }
  if (value->type != GCONF_TYPE_STRING)
    {
      grecs_error (locus, 0, _("expected scalar value but found list"));
      return 1;
    }
  d = strtod (value->v.string, &p);
  if (*p)
    {
      grecs_error (locus, 0, _("not a valid double precision value"));
      return 1;
    }
  if (d < 0)
    {
      grecs_error (locus, 0, _("negative values not allowed"));
      return 1;
    }
  *dptr = d;

  return 0;
}

static struct grecs_keyword monitor_kw[] = {
  { "host", NULL, N_("Host name or IP address"),
    grecs_type_string, NULL, offsetof(struct monitor, name) },
  { "directory", N_("name"), N_("Subdirectory name"),
    grecs_type_string, NULL, offsetof(struct monitor, dir) },
  { "max-speed", NULL, N_("Maximum speed"),
    grecs_type_ulong, NULL, offsetof(struct monitor, max_rate) },
  { "max-adjust", NULL, N_("Adjust maximum by this value when needed"),
    grecs_type_ulong, NULL, offsetof(struct monitor, max_adjust) },
  { "rate-units", NULL, N_("Name of rate units"),
    grecs_type_string, NULL, offsetof(struct monitor, rate_unit) },
  { "scale", N_("arg: double"), N_("Scaling factor"),
    grecs_type_string, NULL, offsetof(struct monitor, scale),
    cb_double },
  { "y-step", N_("arg: double"), N_("Step for Y axis"),
    grecs_type_string, NULL, offsetof(struct monitor, ystep),
    cb_double},
  { "y-step-absolute", NULL, N_("y-step is an absolute value"),
    grecs_type_bool, NULL, offsetof(struct monitor, ystep_absolute) },
  { "swap", NULL, N_("Swap in and out rates"),
    grecs_type_bool, NULL, offsetof(struct monitor, swap) },
  { NULL }
};


static int
cb_number_suffixes (enum grecs_callback_command cmd,
		    grecs_locus_t *locus,
		    void *varptr,
		    grecs_value_t *value,
		    void *cb_data)
{
  switch (value->type)
    {
    case GCONF_TYPE_STRING:
        number_suffix_count = 2;
	number_suffix = xcalloc (2, sizeof (number_suffix[0]));
	number_suffix[0] = "";
	number_suffix[1] = value->v.string;
	break;

    case GCONF_TYPE_ARRAY:
      {
	int i;
	
	number_suffix_count = value->v.arg.c + 1;
	number_suffix = xcalloc (number_suffix_count,
				 sizeof (number_suffix[0]));
	number_suffix[0] = "";
      
	for (i = 0; i < value->v.arg.c; i++)
	  {
	    grecs_value_t *pv = &value->v.arg.v[i];
	    if (pv->type != GCONF_TYPE_STRING)
	      {
		grecs_error (locus, 0,
			     _("expected scalar value but found list"));
		return 1;
	      }
	    number_suffix[i] = pv->v.string;
	  }
      }
      break;
	
    case GCONF_TYPE_LIST:
      {
	const void *p;
	int i = 1;
	gl_list_iterator_t itr = gl_list_iterator (value->v.list);
	
	while (gl_list_iterator_next (&itr, &p, NULL))
	  {
	    const grecs_value_t *vp = p;
	    if (vp->type != GCONF_TYPE_STRING)
	      {
		grecs_error (locus, 0,
			     _("expected scalar value but found list"));
		return 1;
	      }
	    number_suffix[i++] = vp->v.string;
	  }
	gl_list_iterator_free (&itr);
      }
    }
  return 0;
}


static int
cb_color (enum grecs_callback_command cmd,
	  grecs_locus_t *locus,
	  void *varptr,
	  grecs_value_t *value,
	  void *cb_data)
{
  unsigned n;
  char *p;
  int *array = varptr;
  
  if (cmd != grecs_callback_set_value)
    {
      grecs_error (locus, 0, _("unexpected block statement"));
      return 1;
    }
  if (!value || value->type != GCONF_TYPE_STRING)
    {
      grecs_error (locus, 0, _("expected scalar value"));
      return 1;
    }

  /* FIXME: allow to use some predefined color names */
  n = strtoul (value->v.string, &p, 0);
  if (*p)
    {
      grecs_error (locus, 0, _("invalid number"));
      return 1;
    }
  array[0] = (n >> 16) & 0xff;
  array[1] = (n >> 8) & 0xff;
  array[2] = n & 0xff;
  return 0;
}



static int
cb_facility (enum grecs_callback_command cmd,
	  grecs_locus_t *locus,
	  void *varptr,
	  grecs_value_t *value,
	  void *cb_data)
{
  int *iptr = varptr;
  const char *str;
  int i;
  static struct log_xlat
  {
    const char *name;
    int facility;
  } xlat_tab[] = {
    { "USER",    LOG_USER },   
    { "DAEMON",  LOG_DAEMON },
    { "AUTH",    LOG_AUTH },
    { "AUTHPRIV",LOG_AUTHPRIV },
    { "MAIL",    LOG_MAIL },
    { "CRON",    LOG_CRON },
    { "LOCAL0",  LOG_LOCAL0 },
    { "LOCAL1",  LOG_LOCAL1 },
    { "LOCAL2",  LOG_LOCAL2 },
    { "LOCAL3",  LOG_LOCAL3 },
    { "LOCAL4",  LOG_LOCAL4 },
    { "LOCAL5",  LOG_LOCAL5 },
    { "LOCAL6",  LOG_LOCAL6 },
    { "LOCAL7",  LOG_LOCAL7 },
    { NULL }
  };
  
  if (cmd != grecs_callback_set_value)
    {
      grecs_error (locus, 0, _("unexpected block statement"));
      return 1;
    }
  if (value->type != GCONF_TYPE_STRING)
    {
      grecs_error (locus, 0, _("expected scalar value but found list"));
      return 1;
    }
  str = value->v.string;
  if (strncasecmp (str, "LOG_", 4) == 0)
    str += 4;
  
  for (i = 0; xlat_tab[i].name; i++)
    if (c_strcasecmp (str, xlat_tab[i].name) == 0)
      {
	*iptr = xlat_tab[i].facility;
	return 0;
      }

  grecs_error (locus, 0, _("unknown syslog facility"));
  return 0;
}


struct cfg_server
{
  const char *id;
  enum tagr_server_type type;
  struct grecs_sockaddr addr;
};

static int
cb_server_type (enum grecs_callback_command cmd,
		grecs_locus_t *locus,
		void *varptr,
		grecs_value_t *value,
		void *cb_data)
{
  enum tagr_server_type *typeptr = varptr;
  if (cmd != grecs_callback_set_value)
    {
      grecs_error (locus, 0, _("unexpected block statement"));
      return 1;
    }
  if (value->type != GCONF_TYPE_STRING)
    {
      grecs_error (locus, 0, _("expected scalar value but found list"));
      return 1;
    }
  if (strcmp (value->v.string, "udp") == 0)
    *typeptr = tagr_udp_server;
  else if (strcmp (value->v.string, "tcp") == 0)
    *typeptr = tagr_tcp_server;
  else
    grecs_error (locus, 0, _("unknown server type"));
  return 0;
}

static struct grecs_keyword server_kw[] = {
  { "type", N_("{udp|tcp}"), N_("Server type"),
    grecs_type_string, NULL, offsetof (struct cfg_server, type),
    cb_server_type },
  { "listen", N_("socket"), N_("Listen on this address"),
    grecs_type_sockaddr, NULL, offsetof (struct cfg_server, addr), },
  { NULL }
};

static int
cb_server (enum grecs_callback_command cmd,
	   grecs_locus_t *locus,
	   void *varptr,
	   grecs_value_t *value,
	   void *cb_data)
{
  int rc;
  struct cfg_server *cfg;
  void **pdata = cb_data;
  
  switch (cmd)
    {
    case grecs_callback_section_begin:
      if (!value || value->type != GCONF_TYPE_STRING
	  || !value->v.string)
	{
	  grecs_error (locus, 0, _("tag must be a string"));
	  return 1;
	}
      cfg = xzalloc (sizeof (*cfg));
      cfg->id = value->v.string;
      *pdata = cfg;
      break;

    case grecs_callback_section_end:
      cfg = *pdata;
      if (cfg->addr.sa == NULL)
	grecs_error (locus, 0, _("listener address is not configured"));
      else
	register_server (cfg->id, cfg->type, cfg->addr);
      free (cfg);
      *pdata = NULL;
      break;
      
    case grecs_callback_set_value:
      grecs_error (locus, 0, _("invalid use of block statement"));
  }
  return 0;
}



static struct grecs_keyword log_kw[] = {
  { "tag", N_("arg"),  N_("Tag syslog diagnostics with this tag."),
    grecs_type_string, &log_tag, 0 },
  { "log-facility", N_("arg"),
    N_("Set syslog facility. Arg is one of the following: user, daemon, "
       "auth, authpriv, mail, cron, local0 through local7 "
       "(case-insensitive), or a facility number."),
    grecs_type_string, NULL, 0, cb_facility },
  { "print-severity", N_("arg"),
    N_("Prefix diagnostics messages with their severity."),
    grecs_type_bool, &log_print_severity, 0 },
  { NULL }
};



static struct grecs_keyword tagr_kw[] = {
  { "basedir", NULL, N_("Set base directory name"),
    grecs_type_string, &basedir },
  { "user", NULL, N_("Run with this user privileges"),
    grecs_type_string, &user },
  { "template", NULL, N_("HTML page template"),
    grecs_type_string, &html_template },
  { "pidfile", NULL, N_("Set pid file name"),
    grecs_type_string, &pidfile },
  { "hostname", NULL, N_("Set host name"),
    grecs_type_string, &hostname },
  { "udb-file", N_("name"), N_("Name of the user database file"),
    grecs_type_string, &tagr_udb_name },
  
  { "server", N_("id: string"), N_("Configure server"),
    grecs_type_section, NULL, 0,
    cb_server, NULL, server_kw },
  
  { "update-interval", NULL, N_("Set graph update interval"),
    grecs_type_uint, &update_interval },
  
  { "monitor", N_("id: string"), N_("Configure a monitor"),
    grecs_type_section, NULL, 0,
    cb_monitor, NULL, monitor_kw },

  { "log", NULL, N_("Configure logging"),
    grecs_type_section, NULL, 0,
    NULL, NULL, log_kw },

  { "lock-count", NULL,
    N_("Set maximum number of attempts to acquire the lock on a database"),
    grecs_type_uint, &lock_retry_count_option },
  { "lock-timeout", N_("seconds"),
    N_("Set the time span between the two locking attempts"),
    grecs_type_uint, &lock_retry_timeout_option },

  { "idle-timeout", N_("seconds"),
    N_("Idle timeout for stream connections"),
    grecs_type_uint, &stream_idle_timeout },
  
  { "number-suffixes", N_("suffixes"),
    N_("Not implemented") /* FIXME */,
    grecs_type_string, NULL, 0, cb_number_suffixes },
  
  { "transparent", NULL, N_("Transparent graphs"),
    grecs_type_bool, &transparent_option },
  { "percent", NULL,
    N_("Draw in/out percent graph (not implemented)"), /* FIXME */
    grecs_type_bool, &percent_option },
  { "zero-unknown", NULL,
    N_("Zero-out missing samples (not implemented)") /* FIXME */,
    grecs_type_bool, &zero_unknown_option },
  { "cut-out-fraction", N_("arg: double"), NULL, /* FIXME */
    grecs_type_string, &cut_out_fraction, 0,
    cb_double },
  { "fill-incoming", NULL, N_("Fill incoming graph"),
    grecs_type_bool, &fill_incoming_option },

  { "color-background", NULL, N_("Set background color"),
    grecs_type_int, color_background, 0, cb_color },
  { "color-light", NULL, N_("`Light' color (for the border)"),
    grecs_type_int, color_light, 0, cb_color },
  { "color-dark", NULL, N_("`Dark' color (for the border)"),
    grecs_type_int, color_dark, 0, cb_color },
  { "color-major", NULL,
    N_("`Major' color (boundaries, max. values, zero mark, etc.)"),
    grecs_type_int, color_major, 0, cb_color },
  { "color-in", NULL, N_("Color for the input graph"),
    grecs_type_int, color_in, 0, cb_color },
  { "color-out", NULL, N_("Color for the output graph"),
    grecs_type_int, color_out, 0, cb_color },
  { "color-percent", NULL, N_("Color for the i/o percent graph"),
    grecs_type_int, color_percent, 0, cb_color },
  { "color-grid", NULL, N_("Grid and axes color"),
    grecs_type_int, color_grid, 0, cb_color },
  { "color-in-max", NULL, N_("Not implemented") /* FIXME */,
    grecs_type_int, color_in_max, 0, cb_color },
  { "color-out-max", NULL, N_("Not implemented") /* FIXME */,
    grecs_type_int, color_out_max, 0, cb_color },

  { NULL }
};

void
config_help ()
{
    static char docstring[] =
      N_("Configuration file structure for tagr.\n");
    /* FIXME:
       "For more information, use `info tagr configuration'."); */
    grecs_format_docstring (stdout, docstring, 0);
    grecs_format_statement_array (stdout, tagr_kw, 1, 0);
}

int
readconfig ()
{
  int rc;
  
  grecs_set_keywords (tagr_kw);
  grecs_include_path_setup (DEFAULT_VERSION_INCLUDE_DIR,
			    DEFAULT_INCLUDE_DIR, NULL);
  grecs_preprocessor = DEFAULT_PREPROCESSOR;
  grecs_log_to_stderr = log_to_stderr;

  if (pp_cmd_stack_init && grecs_preprocessor)
    {
      char *defs = obstack_finish (&pp_cmd_stack);
      char *cmd = xmalloc (strlen (grecs_preprocessor) + strlen (defs) + 1);
      strcpy (cmd, grecs_preprocessor);
      strcat (cmd, defs);
      grecs_preprocessor = cmd;
      obstack_free (&pp_cmd_stack, NULL);
    }
  if (preprocess_only)
    exit (grecs_preproc_run (configfile, grecs_preprocessor) ? EX_CONFIG : 0);
  rc = grecs_parse (configfile);
  if (rc == 0)
    mon_base = obstack_finish (&mon_stack);
  if (cut_out_fraction < 1.0)
    cut_out_fraction = TAGR_CUT_OUT;
  return rc;
}

void
define_symbol (char *p)
{
  if (!pp_cmd_stack_init)
    {
      obstack_init (&pp_cmd_stack);
      pp_cmd_stack_init = 1;
    }
  obstack_grow (&pp_cmd_stack, " \"-D", 4);
  for (p = optarg; *p; p++)
    {
      if (*p == '\\' || *p == '"')
	obstack_1grow (&pp_cmd_stack, '\\');
      obstack_1grow (&pp_cmd_stack, *p);
    }
  obstack_1grow (&pp_cmd_stack, '"');  
}

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