/*

 * 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 GSList *option;

static GSList *alias;

static GSList *binding;

typedef struct {

  gchar *name;

  gchar *value;

} T_setting;

static inline GSList **get_list_ptr(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;

}

// Return a pointer to the node with the requested key, or NULL if none found

static GSList *settings_find(GSList *list, const gchar *key)

{

  GSList *ptr;

  if (!list) return NULL;

  for (ptr = list ; ptr; ptr = g_slist_next(ptr))

    if (!strcasecmp(key, ((T_setting*)ptr->data)->name))

      break;

  return ptr;

}

/* -- */

//  cfg_read_file(filename)

// Read and parse config file "filename".  If filename is NULL,

// try to open the configuration file at the default locations.

//

int cfg_read_file(char *filename)

{

  FILE *fp;

  char *buf;

  char *line, *eol;

  unsigned int ln = 0;

  int err = 0;

  if (!filename) {

    // Use default config file locations

    char *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);

    // 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);

  } else {

    if ((fp = fopen(filename, "r")) == NULL) {

      perror("Cannot open configuration file");

      return -2;

    }

    // Check configuration file permissions (see above)

    checkset_perm(filename, TRUE);

  }

  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;

    if ((strchr(line, '=') != NULL)) {

      // Only accept the set, alias and bind commands

      if (strncmp(line, "set ", strlen("set ")) &&

          strncmp(line, "bind ", strlen("bind ")) &&

          strncmp(line, "alias ", strlen("alias "))) {

        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);

    } else {

      scr_LogPrint(LPRINT_LOGNORM,

                   "Error in configuration file (l. %d): no assignment", ln);

      err++;

    }

  }

  g_free(buf);

  fclose(fp);

  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, const gchar **pkey, const 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)

{

  GSList **plist;

  GSList *sptr;

  T_setting *setting;

  plist = get_list_ptr(type);

  if (!plist) return;

  sptr = settings_find(*plist, key);

  if (sptr) {

    // The setting has been found.  We will update it or delete it.

    setting = (T_setting*)sptr->data;

    g_free(setting->value);

    if (!value) {

      // Let's remove the setting

      g_free(setting->name);

      *plist = g_slist_delete_link(*plist, sptr);

    } else {

      // Let's update the setting

      setting->value = g_strdup(value);

    }

  } else if (value) {

    setting = g_new(T_setting, 1);

    setting->name  = g_strdup(key);

    setting->value = g_strdup(value);

    *plist = g_slist_append(*plist, setting);

  }

}

void settings_del(guint type, const gchar *key)

{

  settings_set(type, key, NULL);

}

const gchar *settings_get(guint type, const gchar *key)

{

  GSList **plist;

  GSList *sptr;

  T_setting *setting;

  plist = get_list_ptr(type);

  sptr = settings_find(*plist, key);

  if (!sptr) return NULL;

  setting = (T_setting*)sptr->data;

  return setting->value;

}

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)(void *param, char *k, char *v),

                      void *param)

{

  GSList **plist;

  GSList *ptr;

  T_setting *setting;

  plist = get_list_ptr(type);

  if (!*plist) return;

  for (ptr = *plist ; ptr; ptr = g_slist_next(ptr)) {

    setting = ptr->data;

    pfunc(param, setting->name, setting->value);

  }

}

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