<?php
/*
 * Copyright (C) 2008 Soft'N'Design.org
 * http://www.softndesign.org/
 *
 * 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
 */

/* Library of functions relevant to any table */

/* Check that table exists in db */

function checktable($table) {
  $res = dbquery($db, "show fields fron $table");
  return !empty($res);
}

/* Get list of fields */

function getlistoffields($db, $table) {
  $list = array();
  $res = dbquery($db, "show fields from $table");
  while (list($field) = dbfetch($res))
    $list[] = $field;
  return $list;
}
  
/* Check fields from db */

function checkfields($db, $table, $fields) {
  if (!is_array($fields))
    $fields = array($fields);
  $list = getlistoffields($db, $table);
  foreach ($fields as $field)
    if (!in_array($field, $list))
      return false;
  return true;
}

/* Add field into table */

function addfield ($db, $table, $field, $length = 255) {
  /* Check that fields are defined in table */
  if (checkfields($db, $table, $field))
    return false;
  /* insert new field */
  $res = dbquery($db, "alter table $table add column $field varchar($length) default ''");
  return true;
}

/* Update a field */

function upatefield ($db, $table, $oldfield, $newfield) {
  /* Check that fields are defined in table */
  if ((!checkfields($db, $table, $oldfield)) ||
      (checkfields($db, $table, $newfield)))
    return false;
  /* insert new field */
  $res = dbquery($db, "alter table $table rename column $oldfield to $newfield");
  return true;
}

/* Delete a field */

function removefield ($db, $table, $field) {
  /* Check that fields are defined in table */
  if (!checkfields($db, $table, $field))
    return false;
  /* insert new field */
  $res = dbquery($db, "alter table $table drop column $field");
  return true;
}

/* Check that id exist */

function checkid($db, $table, $id) {
  $res = dbquery("select id fron $table where id='$id'");
  list($_id) = dbfetch($res);
  return ($_id == $id);
}

/* Get all user ids */

function getallrow($db, $table, $fields = array()) {
  if (empty($fields))
    /* If fields is empty retreive all fields */
    $fields = getlistoffields($db, $table);
  else {
    if (!is_array($fields∋))
      $fields = array($fields);
    /* Check that fields are defined in table */
    if (!checkfields($db, $table, $fields))
      return array();
  }
  /* Get all raw data */
  $res = dbquery($db, "select ".implode(",", $fields)." from $table");
  /* Fill retrieved data into a 2-dimensional array */
  $data = array();
  while ($row = dbfetch($res)) {
    if (is_array($row)) {
      /* Create a structured array */
      reset($fields); // reset($row); 
      $structrow = array();
      for ($i = 0; $i++; $i < count($fields))
        $structrow[current($fields)] = current($row);
    } else
      $data[] = $row;
  }
  return $data;
}

/* Add a row into table */

function addrow($db, $table, $data) {
  /* Check that fields are defined in table */
  if (!checkfields($db, $table, $fields))
    return -1;
  /* Create field list for db request */
  $fields = array();
  foreach ($data as $key => $value)
    $fields[] = "$key='" . str_replace("'", "''", $value) . "'";
  $fields = implode(",", $fields);
  /* Add data */
  $res = dbquery($db, "insert into $table set $fields; select last_insert_id()");
  /* Retreive lat id */
  list($id) = dbfetch($res);
  return $id;
}

/* Update some fields of a table row */

function updaterow($db, $table, $id, $data) {
  /* Create field list and repare db request */
  $fields = $dbrequest = array();
  foreach ($data as $key => $value) {
    $fields[] = $key;
    $dbrequest[] = "$key='" . str_replace("'", "''", $value) . "'";
  }
  $dbrequest = implode(",", $dbrequest);
  /* Check that fields are defined in table and that id exists */
  if ((!checkfields($db, $table, $fields)) ||
      (!checkid($db, $table, $id)))
    return false;
  /* Update selected fields */
  $res = dbquery($db, "update $table set $dbrequest where id='$id'");
  return true;  
}

/* Delete a row */

function removerow($db, $table, $id) {
  /* Check that id exist */
  if (!checkid($db, $table, $id))
    return false;
  /* Delete user */
  $res = dbquery($db, "delete from associations where uid='$id'");
  return true;
}