<?php defined("SYSPATH") or die("No direct script access.");
/**
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2012 Bharat Mediratta
 *
 * 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., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */
class message_Core {
  const SUCCESS = 1;
  const INFO    = 2;
  const WARNING = 3;
  const ERROR   = 4;

  /**
   * Report a successful event.
   * @param string  $msg           a detailed message
   */
  static function success($msg) {
    self::_add($msg, message::SUCCESS);
  }

  /**
   * Report an informational event.
   * @param string  $msg           a detailed message
   */
  static function info($msg) {
    self::_add($msg, message::INFO);
  }

  /**
   * Report that something went wrong, not fatal, but worth investigation.
   * @param string  $msg           a detailed message
   */
  static function warning($msg) {
    self::_add($msg, message::WARNING);
  }

  /**
   * Report that something went wrong that should be fixed.
   * @param string  $msg           a detailed message
   */
  static function error($msg) {
    self::_add($msg, message::ERROR);
  }

  /**
   * Save a message in the session for our next page load.
   * @param string  $msg           a detailed message
   * @param integer $severity      one of the severity constants
   */
  private static function _add($msg, $severity) {
    $session = Session::instance();
    $status = $session->get("messages");
    $status[] = array($msg, $severity);
    $session->set("messages", $status);
  }

  /**
   * Get any pending messages.  There are two types of messages, transient and permanent.
   * Permanent messages are used to let the admin know that there are pending administrative
   * issues that need to be resolved.  Transient ones are only displayed once.
   * @return html text
   */
  static function get() {
    $buf = array();

    $messages = Session::instance()->get_once("messages", array());
    foreach ($messages as $msg) {
      $msg[0] = str_replace("__CSRF__", access::csrf_token(), $msg[0]);
      $buf[] = "<li class=\"" . message::severity_class($msg[1]) . "\">$msg[0]</li>";
    }
    if ($buf) {
      return "<ul id=\"g-action-status\" class=\"g-message-block\">" . implode("", $buf) . "</ul>";
    }
  }

  /**
   * Convert a message severity to a CSS class
   * @param  integer $severity
   * @return string
   */
  static function severity_class($severity) {
    switch($severity) {
    case message::SUCCESS:
      return "g-success";

    case message::INFO:
      return "g-info";

    case message::WARNING:
      return "g-warning";

    case message::ERROR:
      return "g-error";
    }
  }
}
