/*
 * settings.c   -- Configuration stuff
 *
 * Copyright (C) 2005, 2006 Mikael Berthe <bmikael@lists.lilotux.net>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#include <strings.h>
#include <stdlib.h>
#include <ctype.h>

#include "settings.h"
#include "commands.h"
#include "utils.h"
#include "logprint.h"

static GHashTable *option;
static GHashTable *alias;
static GHashTable *binding;

#ifdef HAVE_GPGME     /* PGP settings */
static GHashTable *pgpopt;

typedef struct {
  gchar *pgp_keyid;   /* KeyId the contact is supposed to use */
  guint pgp_disabled; /* If TRUE, PGP is disabled for outgoing messages */
  guint pgp_force;    /* If TRUE, PGP is used w/o negotiation */
} T_pgpopt;
#endif

static inline GHashTable *get_hash(guint type)
{
  if      (type == SETTINGS_TYPE_OPTION)  return option;
  else if (type == SETTINGS_TYPE_ALIAS)   return alias;
  else if (type == SETTINGS_TYPE_BINDING) return binding;
  return NULL;
}

/* -- */

void settings_init(void)
{
  option  = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);
  alias   = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);
  binding = g_hash_table_new_full(&g_str_hash, &g_str_equal, &g_free, &g_free);
#ifdef HAVE_GPGME
  pgpopt = g_hash_table_new(&g_str_hash, &g_str_equal);
#endif
}

//  cfg_read_file(filename, mainfile)
// Read and parse config file "filename".  If filename is NULL,
// try to open the configuration file at the default locations.
// mainfile must be set to TRUE for the startup config file.
// If mainfile is TRUE, the permissions of the configuration file will
// be fixed if they're insecure.
//
int cfg_read_file(char *filename, guint mainfile)
{
  FILE *fp;
  char *buf;
  char *line, *eol;
  unsigned int ln = 0;
  int err = 0;

  if (!filename) {
    // Use default config file locations
    char *home;

    if (!mainfile) {
      scr_LogPrint(LPRINT_LOGNORM, "No file name provided");
      return -1;
    }

    home = getenv("HOME");
    if (!home) {
      scr_LogPrint(LPRINT_LOG, "Can't find home dir!");
      fprintf(stderr, "Can't find home dir!\n");
      return -1;
    }
    filename = g_new(char, strlen(home)+24);
    sprintf(filename, "%s/.mcabber/mcabberrc", home);
    if ((fp = fopen(filename, "r")) == NULL) {
      // 2nd try...
      sprintf(filename, "%s/.mcabberrc", home);
      if ((fp = fopen(filename, "r")) == NULL) {
        fprintf(stderr, "Cannot open config file!\n");
        g_free(filename);
        return -1;
      }
    }
    // Check configuration file permissions
    // As it could contain sensitive data, we make it user-readable only
    checkset_perm(filename, TRUE);
    scr_LogPrint(LPRINT_LOGNORM, "Reading %s", filename);
    // Check mcabber dir.  There we just warn, we don't change the modes
    sprintf(filename, "%s/.mcabber/", home);
    checkset_perm(filename, FALSE);
    g_free(filename);
    filename = NULL;
  } else {
    if ((fp = fopen(filename, "r")) == NULL) {
      const char *msg = "Cannot open configuration file";
      if (mainfile)
        perror(msg);
      else
        scr_LogPrint(LPRINT_LOGNORM, "%s (%s).", msg, filename);
      return -2;
    }
    // Check configuration file permissions (see above)
    // We don't change the permissions if that's not the main file.
    checkset_perm(filename, mainfile);
    scr_LogPrint(LPRINT_LOGNORM, "Reading %s", filename);
  }

  buf = g_new(char, 512);

  while (fgets(buf+1, 511, fp) != NULL) {
    // The first char is reserved to add a '/', to make a command line
    line = buf+1;
    ln++;

    // Strip leading spaces
    while (isspace(*line))
      line++;

    // Make eol point to the last char of the line
    for (eol = line ; *eol ; eol++)
      ;
    if (eol > line)
      eol--;

    // Strip trailing spaces
    while (eol > line && isspace(*eol))
      *eol-- = 0;

    // Ignore empty lines and comments
    if ((*line == '\n') || (*line == '\0') || (*line == '#'))
      continue;

    // We only allow assignments line, except for commands "pgp" and "source"
    if ((strchr(line, '=') != NULL) ||
        startswith(line, "pgp ") || startswith(line, "source ")) {
      // Only accept the set, alias, bind, pgp and source commands
      if (!startswith(line, "set ")   && !startswith(line, "bind ") &&
          !startswith(line, "alias ") && !startswith(line, "pgp ")  &&
          !startswith(line, "source ")) {
        scr_LogPrint(LPRINT_LOGNORM,
                     "Error in configuration file (l. %d): bad command", ln);
        err++;
        continue;
      }
      // Set the leading COMMAND_CHAR to build a command line
      // and process the command
      *(--line) = COMMAND_CHAR;
      process_command(line, TRUE);
    } else {
      scr_LogPrint(LPRINT_LOGNORM,
                   "Error in configuration file (l. %d): no assignment", ln);
      err++;
    }
  }
  g_free(buf);
  fclose(fp);

  if (filename)
    scr_LogPrint(LPRINT_LOGNORM, "Loaded %s.", filename);
  return err;
}

//  parse_assigment(assignment, pkey, pval)
// Read assignment and split it to key, value
//
// If this is an assignment, the function will return TRUE and
// set *pkey and *pval (*pval is set to NULL if value field is empty).
//
// If this isn't a assignment (no = char), the function will set *pval
// to NULL and return FALSE.
//
// The caller should g_free() *pkey and *pval (if not NULL) after use.
guint parse_assigment(gchar *assignment, gchar **pkey, gchar **pval)
{
  char *key, *val, *t, *p;

  *pkey = *pval = NULL;

  key = assignment;
  // Remove leading spaces in option name
  while ((!isalnum(*key)) && (*key != '=') && *key) {
    //if (!isblank(*key))
    //  scr_LogPrint("Error in assignment parsing!");
    key++;
  }
  if (!*key) return FALSE; // Empty assignment

  if (*key == '=') {
    //scr_LogPrint("Cannot parse assignment!");
    return FALSE;
  }
  // Ok, key points to the option name

  for (val = key+1 ; *val && (*val != '=') ; val++)
    if (!isalnum(*val) && !isblank(*val) && (*val != '_') && (*val != '-')) {
      // Key should only have alnum chars...
      //scr_LogPrint("Error in assignment parsing!");
      return FALSE;
    }
  // Remove trailing spaces in option name:
  for (t = val-1 ; t > key && isblank(*t) ; t--)
    ;
  // Check for embedded whitespace characters
  for (p = key; p < t; p++) {
    if (isblank(*p)) {
      //scr_LogPrint("Error in assignment parsing!"
      //             " (Name should not contain space chars)");
      return FALSE;
    }
  }

  *pkey = g_strndup(key, t+1-key);

  if (!*val) return FALSE; // Not an assignment

  // Remove leading and trailing spaces in option value:
  for (val++; *val && isblank(*val) ; val++) ;
  for (t = val ; *t ; t++) ;
  for (t-- ; t >= val && isblank(*t) ; t--) ;

  if (t < val) return TRUE; // no value (variable reset for example)

  // If the value begins and ends with quotes ("), these quotes are
  // removed and whitespace is not stripped
  if ((t>val) && (*val == '"' && *t == '"')) {
    val++;
    t--;
  }
  *pval = g_strndup(val, t+1-val);
  return TRUE;
}

void settings_set(guint type, const gchar *key, const gchar *value)
{
  GHashTable *hash;

  hash = get_hash(type);
  if (!hash)
    return;

  if (!value) {
    g_hash_table_remove(hash, key);
  } else {
    g_hash_table_insert(hash, g_strdup(key), g_strdup(value));
  }
}

void settings_del(guint type, const gchar *key)
{
  settings_set(type, key, NULL);
}

const gchar *settings_get(guint type, const gchar *key)
{
  GHashTable *hash;

  hash = get_hash(type);
  if (!hash)
    return NULL;

  return g_hash_table_lookup(hash, key);
}

int settings_get_int(guint type, const gchar *key)
{
  const gchar *setval = settings_get(type, key);

  if (setval) return atoi(setval);
  return 0;
}

//  settings_get_status_msg(status)
// Return a string with the current status message:
// - if there is a user-defined message ("message" option),
//   return this message
// - if there is a user-defined message for the given status (and no
//   generic user message), it is returned
// - if no message is found, return NULL
const gchar *settings_get_status_msg(enum imstatus status)
{
  const gchar *rstatus = settings_opt_get("message");

  if (rstatus) return rstatus;

  switch(status) {
    case available:
        rstatus = settings_opt_get("message_avail");
        break;

    case freeforchat:
        rstatus = settings_opt_get("message_free");
        break;

    case dontdisturb:
        rstatus = settings_opt_get("message_dnd");
        break;

    case notavail:
        rstatus = settings_opt_get("message_notavail");
        break;

    case away:
        rstatus = settings_opt_get("message_away");
        break;

    default: // offline, invisible
        break;
  }
  return rstatus;
}

//  settings_foreach(type, pfunction, param)
// Call pfunction(param, key, value) for each setting with requested type.
void settings_foreach(guint type, void (*pfunc)(char *k, char *v, void *param),
                      void *param)
{
  GHashTable *hash;

  hash = get_hash(type);
  if (!hash)
    return;

  g_hash_table_foreach(hash, (GHFunc)pfunc, param);
}


//  default_muc_nickname()
// Return the user's default nickname
// The caller should free the string after use
char *default_muc_nickname(void)
{
  char *nick;

  // We try the "nickname" option, then the username part of the jid.
  nick = (char*)settings_opt_get("nickname");
  if (nick)
    return g_strdup(nick);

  nick = g_strdup(settings_opt_get("username"));
  if (nick) {
    char *p = strchr(nick, JID_DOMAIN_SEPARATOR);
    if (p > nick)
      *p = 0;
  }
  return nick;
}


/* PGP settings */

//  settings_pgp_setdisabled(jid, value)
// Enable/disable PGP encryption for jid.
// (Set value to TRUE to disable encryption)
void settings_pgp_setdisabled(const char *bjid, guint value)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (!pgpdata) {
    // If value is 0, we do not need to create a structure (that's
    // the default value).
    if (value) {
      pgpdata = g_new0(T_pgpopt, 1);
      pgpdata->pgp_disabled = value;
      g_hash_table_insert(pgpopt, g_strdup(bjid), pgpdata);
    }
  } else {
    pgpdata->pgp_disabled = value;
    // We could remove the key/value if pgp_disabled is 0 and
    // pgp_keyid is NULL, actually.
  }
#endif
}

//  settings_pgp_getdisabled(jid)
// Return TRUE if PGP encryption should be disabled for jid.
guint settings_pgp_getdisabled(const char *bjid)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (pgpdata)
    return pgpdata->pgp_disabled;
  else
    return FALSE; // Default: not disabled
#else
  return TRUE;    // No PGP support, let's say it's disabled.
#endif
}

//  settings_pgp_setforce(jid, value)
// Force (or not) PGP encryption for jid.
// When value is TRUE, PGP support will be assumed for the remote client.
void settings_pgp_setforce(const char *bjid, guint value)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (!pgpdata) {
    // If value is 0, we do not need to create a structure (that's
    // the default value).
    if (value) {
      pgpdata = g_new0(T_pgpopt, 1);
      pgpdata->pgp_force = value;
      g_hash_table_insert(pgpopt, g_strdup(bjid), pgpdata);
    }
  } else {
    pgpdata->pgp_force = value;
  }
  if (!pgpdata->pgp_keyid)
    scr_LogPrint(LPRINT_NORMAL, "Warning: the Key Id is not set!");
#endif
}

//  settings_pgp_getforce(jid)
// Return TRUE if PGP enforcement is set for jid.
guint settings_pgp_getforce(const char *bjid)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (pgpdata)
    return pgpdata->pgp_force;
  else
    return FALSE; // Default
#else
  return FALSE;   // No PGP support
#endif
}

//  settings_pgp_setkeyid(jid, keyid)
// Set the PGP KeyId for user jid.
// Use keyid = NULL to erase the previous KeyId.
void settings_pgp_setkeyid(const char *bjid, const char *keyid)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (!pgpdata) {
    // If keyid is NULL, we do not need to create a structure (that's
    // the default value).
    if (keyid) {
      pgpdata = g_new0(T_pgpopt, 1);
      pgpdata->pgp_keyid = g_strdup(keyid);
      g_hash_table_insert(pgpopt, g_strdup(bjid), pgpdata);
    }
  } else {
    g_free(pgpdata->pgp_keyid);
    if (keyid)
      pgpdata->pgp_keyid = g_strdup(keyid);
    else
      pgpdata->pgp_keyid = NULL;
    // We could remove the key/value if pgp_disabled is 0 and
    // pgp_keyid is NULL, actually.
  }
#endif
}

//  settings_pgp_getkeyid(jid)
// Get the PGP KeyId for user jid.
const char *settings_pgp_getkeyid(const char *bjid)
{
#ifdef HAVE_GPGME
  T_pgpopt *pgpdata;
  pgpdata = g_hash_table_lookup(pgpopt, bjid);
  if (pgpdata)
    return pgpdata->pgp_keyid;
#endif
  return NULL;
}

guint get_max_history_blocks(void)
{
  int max_num_of_blocks = settings_opt_get_int("max_history_blocks");
  if (max_num_of_blocks < 0)
    max_num_of_blocks = 0;
  else if (max_num_of_blocks == 1)
    max_num_of_blocks = 2;
  return (guint)max_num_of_blocks;
}

/* vim: set expandtab cindent cinoptions=>2\:2(0:  For Vim users... */