<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2009 Dan Fuhry

 *

 * This program is Free Software; you can redistribute 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 details.

 */

/**

 * Fetch a value from the site configuration.

 * @param string The identifier of the value ("site_name" etc.)

 * @param string If specified, this is the "default" value for the configuration entry. Defaults to false.

 * @return string Configuration value, or bool(false) if the value is not set

 */

function getConfig($n, $default = false)

{

  global $enano_config;

  if ( isset( $enano_config[ $n ] ) )

  {

    return $enano_config[$n];

  }

  else

  {

    return $default;

  }

}

/**

 * Update or change a configuration value.

 * @param string The identifier of the value ("site_name" etc.)

 * @param string The new value

 * @return null

 */

function setConfig($n, $v)

{

  global $enano_config, $db;

  if ( isset($enano_config[$n]) )

  {

    if ( $enano_config[$n] === $v )

    {

      // configuration already matches this value

      return true;

    }

  }

  $enano_config[$n] = $v;

  if ( $v === false )

    unset($enano_config[$n]);

  $v = $db->escape($v);

  $e = $db->sql_query('DELETE FROM '.table_prefix.'config WHERE config_name=\''.$n.'\';');

  if ( !$e )

  {

    $db->_die('Error during generic setConfig() call row deletion.');

  }

  if ( $v !== false )

  {

    $e = $db->sql_query('INSERT INTO '.table_prefix.'config(config_name, config_value) VALUES(\''.$n.'\', \''.$v.'\')');

    if ( !$e )

    {

      $db->_die('Error during generic setConfig() call row insertion.');

    }

  }

}

/**

 * Create a URI for an internal link.

 * @param string The full identifier of the page to link to (Special:Administration)

 * @param string The GET query string to append

 * @param bool   If true, perform htmlspecialchars() on the return value to make it HTML-safe

 * @return string

 */

if ( !function_exists('makeUrl') )

{

  function makeUrl($t, $query = false, $escape = false)

  {

    global $db, $session, $paths, $template, $plugins; // Common objects

    $flags = '';

    $sep = urlSeparator;

    $t = sanitize_page_id($t);

    if ( isset($_GET['printable'] ) )

    {

      $flags .= $sep . 'printable=yes';

      $sep = '&';

    }

    if ( isset($_GET['theme'] ) )

    {

      $flags .= $sep . 'theme='.$session->theme;

      $sep = '&';

    }

    if ( isset($_GET['style'] ) )

    {

      $flags .= $sep . 'style='.$session->style;

      $sep = '&';

    }

    if ( isset($_GET['lang']) && preg_match('/^[a-z0-9_]+$/', @$_GET['lang']) )

    {

      $flags .= $sep . 'lang=' . urlencode($_GET['lang']);

      $sep = '&';

    }

    $url = is_object($session) ? $session->append_sid(contentPath.$t.$flags) : contentPath . $t . $flags;

    if($query)

    {

      $sep = strstr($url, '?') ? '&' : '?';

      $url = $url . $sep . $query;

    }

    return ($escape) ? htmlspecialchars($url) : $url;

  }

}

/**

 * Create a URI for an internal link, and be namespace-friendly. Watch out for this one because it's different from most other Enano functions, in that the namespace is the first parameter.

 * @param string The namespace ID

 * @param string The page ID

 * @param string The GET query string to append

 * @param bool   If true, perform htmlspecialchars() on the return value to make it HTML-safe

 * @return string

 */

if ( !function_exists('makeUrlNS') )

{

  function makeUrlNS($n, $t, $query = false, $escape = false)

  {

    global $db, $session, $paths, $template, $plugins; // Common objects

    $flags = '';

    if(defined('ENANO_BASE_CLASSES_INITIALIZED'))

    {

      $sep = urlSeparator;

    }

    else

    {

      $sep = (strstr($_SERVER['REQUEST_URI'], '?')) ? '&' : '?';

    }

    if ( isset( $_GET['printable'] ) ) {

      $flags .= $sep . 'printable';

      $sep = '&';

    }

    if ( isset( $_GET['theme'] ) )

    {

      $flags .= $sep . 'theme='.$session->theme;

      $sep = '&';

    }

    if ( isset( $_GET['style'] ) )

    {

      $flags .= $sep . 'style='.$session->style;

      $sep = '&';

    }

    if ( isset($_GET['lang']) && preg_match('/^[a-z0-9_]+$/', @$_GET['lang']) )

    {

      $flags .= $sep . 'lang=' . urlencode($_GET['lang']);

      $sep = '&';

    }

    $ns_prefix = "$n:";

    if(defined('ENANO_BASE_CLASSES_INITIALIZED'))

    {

      $ns_prefix = ( isset($paths->nslist[$n]) ) ? $paths->nslist[$n] : $n . substr($paths->nslist['Special'], -1);

      $url = contentPath . $ns_prefix . $t . $flags;

    }

    else

    {

      // If the path manager hasn't been initted yet, take an educated guess at what the URI should be

      $url = contentPath . $n . ':' . $t . $flags;

    }

    if($query)

    {

      if(strstr($url, '?'))

      {

        $sep =  '&';

      }

      else

      {

        $sep = '?';

      }

      $url = $url . $sep . $query . $flags;

    }

    if(defined('ENANO_BASE_CLASSES_INITIALIZED'))

    {

      $url = $session->append_sid($url);

    }

    return ($escape) ? htmlspecialchars($url) : $url;

  }

}

/**

 * Create a URI for an internal link, be namespace-friendly, and add http://hostname/scriptpath to the beginning if possible. Watch out for this one because it's different from most other Enano functions, in that the namespace is the first parameter.

 * @param string The namespace ID

 * @param string The page ID

 * @param string The GET query string to append

 * @param bool   If true, perform htmlspecialchars() on the return value to make it HTML-safe

 * @return string

 */

function makeUrlComplete($n, $t, $query = false, $escape = false)

{

  return get_server_url() . makeUrlNS($n, $t, $query, $escape);

}

/**

 * Returns an http:// URL for this server.

 * @return string

 */

function get_server_url()

{

  return 'http' . ( $GLOBALS['is_https'] ) . '://' . $_SERVER['HTTP_HOST'];

}

/**

 * Returns the full page ID string of the main page.

 * @return string

 */

function get_main_page($force_logged_in = false)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  $logged_in = false;

  if ( is_object($session) && !$force_logged_in )

  {

    $logged_in = $session->user_logged_in;

  }

  else if ( $force_logged_in )

  {

    $logged_in = true;

  }

  return $logged_in && getConfig('main_page_alt_enable', '0') == '1' ? getConfig('main_page_alt', getConfig('main_page', 'Main_Page')) : getConfig('main_page', 'Main_Page');

}

/**

 * Enano replacement for date(). Accounts for individual users' timezone preferences.

 * @param string Date-formatted string

 * @param int Optional - UNIX timestamp value to use. If omitted, the current time is used.

 * @return string Formatted string

 */

function enano_date($string, $timestamp = false)

{

  if ( !is_int($timestamp) && !is_double($timestamp) && strval(intval($timestamp)) !== $timestamp )

    $timestamp = time();

  if ( is_int($string) )

  {

    global $session, $lang;

    $date_fmt = is_object($session) ? $session->date_format : DATE_4;

    $time_fmt = is_object($session) ? $session->time_format : TIME_24_NS;

    // within a week? use a relative date

    if ( $timestamp + ( 86400 * 7 ) >= time() && $string & ED_DATE && is_object($lang) && is_object($session) )

    {

      $relative_date = get_relative_date($timestamp);

      if ( $string === ED_DATE )

        // why do more work if we're done?

        return $relative_date;

    }

    $flags = $string;

    $string = array();

    if ( $flags & ED_DATE && !isset($relative_date) )

      $string[] = $date_fmt;

    if ( $flags & ED_TIME )

      $string[] = $time_fmt;

    $string = implode(' ', $string);

  }

  // perform timestamp offset

  global $timezone;

  // it's gonna be in minutes, so multiply by 60 to offset the unix timestamp

  $timestamp = $timestamp + ( $timezone * 60 );

  // are we in DST?

  global $dst_params;

  if ( check_timestamp_dst($timestamp, $dst_params[0], $dst_params[1], $dst_params[2], $dst_params[3]) )

  {

    // offset for DST

    $timestamp += ( $dst_params[4] * 60 );

  }

  // Let PHP do the work for us =)

  $result = gmdate($string, $timestamp);

  if ( isset($relative_date) )

  {

    $result = "$relative_date, $result";

  }

  return $result;

}

/**

 * Get a relative date ("Today"/"Yesterday"/"N days ago")

 * @param int Timestamp

 * @return string

 */

function get_relative_date($time)

{

  global $lang, $session;

  // Our formatting string to pass to enano_date()

  // This should not include minute/second info, only today's date in whatever format suits your fancy

  $formatstring = $session->date_format;

  // Today's date

  $today = enano_date($formatstring);

  // Yesterday's date

  $yesterday = enano_date($formatstring, (time() - (24*60*60)));

  // Date on the input

  $then = enano_date($formatstring, $time);

  // "X days ago" logic

  for ( $i = 2; $i <= 6; $i++ )

  {

    // hours_in_day * minutes_in_hour * seconds_in_minute * num_days

    $offset = 24 * 60 * 60 * $i;

    $days_ago = enano_date($formatstring, (time() - $offset));

    // so does the input timestamp match the date from $i days ago?

    if ( $then == $days_ago )

    {

      // yes, return $i

      return $lang->get('userfuncs_ml_date_daysago', array('days_ago' => $i));

    }

  }

  // either yesterday, today, or before 6 days ago

  switch($then)

  {

    case $today:

      return $lang->get('userfuncs_ml_date_today');

    case $yesterday:

      return $lang->get('userfuncs_ml_date_yesterday');

    default:

      return $then;

  }

  //     .--.

  //    |o_o |

  //    |!_/ |

  //   //   \ \

  //  (|     | )

  // /'\_   _/`\

  // \___)=(___/

  return 'Linux rocks!';

}

/**

 * Determine if a timestamp is within DST.

 * @param int Timestamp

 * @param int Start month (1-12) of DST

 * @param int Which Sunday DST starts on (*_SUNDAY constants)

 * @param int End month of DST

 * @param int Which Sunday DST ends on

 * @return bool

 */

function check_timestamp_dst($time, $start_month, $start_sunday, $end_month, $end_sunday)

{

  static $sundays = array(FIRST_SUNDAY, SECOND_SUNDAY, THIRD_SUNDAY, LAST_SUNDAY);

  // perform timestamp offset

  global $timezone;

  // it's gonna be in minutes, so multiply by 60 to offset the unix timestamp

  $time = $time + ( $timezone * 60 );

  $year = intval(gmdate('Y', $time));

  // one-pass validation

  if ( !in_array($start_sunday, $sundays) || !in_array($end_sunday, $sundays) ||

       $start_month < 1 || $start_month > 12 || $end_month < 1 || $end_month > 12 )

    return false;

  // get timestamp of the selected sunday (start)

  $dst_start = get_sunday_timestamp($start_month, $start_sunday, $year);

  $dst_end   = get_sunday_timestamp($end_month, $end_sunday, $year);

  if ( $dst_start > $dst_end )

  {

    // start time is past the end time, this means we're in the southern hemisphere

    // as a result, if we're within the range, DST is NOT in progress.

    return !( $time >= $dst_start && $time <= $dst_end );

  }

  return $time >= $dst_start && $time <= $dst_end;

}

/**

 * Returns a timestamp for the given *_SUNDAY index.

 * @param int Month

 * @param int Which Sunday (FIRST, SECOND, THIRD, or LAST)

 * @param int Year that we're doing our calculations in

 * @return int

 */

function get_sunday_timestamp($month, $sunday, $year)

{

  $days_in_month = array(

    1 => 31,

    2 => $year % 4 == 0 && ( $year % 100 != 0 || ( $year % 100 == 0 && $year % 400 == 0 ) ) ? 29 : 28,

    3 => 31,

    4 => 30,

    5 => 31,

    6 => 30,

    7 => 31,

    8 => 31,

    9 => 30,

    10 => 31,

    11 => 30,

    12 => 31

  );

  $result = mktime(0, 0, 0, $month, 1, $year);

  // hack. allows a specific day of the month to be set instead of a sunday. not a good place to do this.

  if ( is_string($sunday) && substr($sunday, -1) === 'd' )

  {

    $result += 86400 * ( intval($sunday) - 1);

    return $result;

  }

  $tick = 0;

  $days_remaining = $days_in_month[$month];

  while ( true )

  {

    if ( date('D', $result) == 'Sun' )

    {

      $tick++;

      if ( ( $tick == 1 && $sunday == FIRST_SUNDAY ) ||

           ( $tick == 2 && $sunday == SECOND_SUNDAY ) ||

           ( $tick == 3 && $sunday == THIRD_SUNDAY ) ||

           ( $sunday == LAST_SUNDAY && $days_remaining < 7 ) )

        break;

    }

    $days_remaining--;

    $result += 86400;

  }

  return $result;

}

/**

 * Tells you the title for the given page ID string

 * @param string Page ID string (ex: Special:Administration)

 * @param bool Optional. If true, and if the namespace turns out to be something other than Article, the namespace prefix will be prepended to the return value.

 * @return string

 */

function get_page_title($page_id, $show_ns = true)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  $idata = RenderMan::strToPageID($page_id);

  return get_page_title_ns($idata[0], $idata[1]);

}

/**

 * Tells you the title for the given page ID and namespace

 * @param string Page ID

 * @param string Namespace

 * @return string

 */

function get_page_title_ns($page_id, $namespace)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  $ns = namespace_factory($page_id, $namespace);

  return $ns->title;

}

/**

 * Redirect the user to the specified URL.

 * @param string $url The URL, either relative or absolute.

 * @param string $title The title of the message

 * @param string $message A short message to show to the user

 * @param string $timeout Timeout, in seconds, to delay the redirect. Defaults to 3. If 0, sends a 307 Temporary Redirect.

 */

function redirect($url, $title = 'etc_redirect_title', $message = 'etc_redirect_body', $timeout = 3)

{

  global $db, $session, $paths, $template, $plugins; // Common objects

  global $lang;