<?php

require_once($lib_dir."transaction.php");

/* Category management */

function nb_categories() {
  global $cat;

  return count($cat);
}

function get_all_categories() {
  global $cat;

  return $cat;
}

function get_category($id) {
  global $cat;

  if (count($cat))
    foreach ($cat as $c)
      if ($c["id"] == $id)
        return $c["description"];

  return "";
}

function get_category_maxlength() {
  global $cat;

  $maxlength = 0;
  if (count($cat))
    foreach ($cat as $c)
      if (strlen($c["description"]) > $maxlength)
        $maxlength = strlen($c["description"]);

  return $maxlength;
}

function add_category($desc) {
  global $cat;
 
  if (strlen($desc) == 0)
    return false;
 
  $id = "";
  if (count($cat))
    foreach ($cat as $c)
      if ($c["id"] > $id)
        $id = $c["id"];

  $cat[] = array("id" => ++$id, "description" => $desc);
  return store_category($id);
}

function modify_category($id, $desc) {
  global $cat;
 
  if (strlen($desc) == 0)
    return false;
  
  if (count($cat))
    foreach ($cat as $key => $c)
      if ($c["id"] == $id) {
	$cat[$key]["description"] = $desc;
	return store_category($id);
      }

  return false;
}

function delete_category($id) {
  global $cat;
  global $trans;

  /* check consistance before category deletion */
  if (count($trans)) {
    $t_id = array();
    foreach ($trans as $key => $t)
      if ($t["catid"] == $id) {
	$trans[$key]["catid"] = 0;
	$t_id[] = $t["id"];
      }
    if (count($t_id))
      store_transaction($t_id);
  }
  
  if (count($cat))
    foreach ($cat as $key => $c)
      if ($c["id"] == $id) {
	unset($cat[$key]);
	return store_category($id);
      }

  return false;
}

/* Initialization */

include($lib_dir.$db_type."/category.php");

?>