<?php
/*
Plugin Name: Group control panel
Plugin URI: http://enanocms.org/
Description: Provides group moderators and site administrators with the ability to control who is part of their groups. 
Author: Dan Fuhry
Version: 1.0.1
Author URI: http://enanocms.org/
*/

/*
 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
 * Version 1.0 release candidate 2
 * Copyright (C) 2007 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.
 */

$plugins->attachHook('base_classes_initted', '
  global $paths;
    $paths->add_page(Array(
      \'name\'=>\'Group Membership\',
      \'urlname\'=>\'Usergroups\',
      \'namespace\'=>\'Special\',
      \'special\'=>0,\'visible\'=>1,\'comments_on\'=>0,\'protected\'=>1,\'delvotes\'=>0,\'delvote_ips\'=>\'\',
      ));
    ');

function page_Special_Usergroups()
{
  global $db, $session, $paths, $template, $plugins; // Common objects
  global $email; // Import e-mail encryption functions
  
  if ( !$session->user_logged_in )
  {
    header('Location: ' . makeUrlComplete('Special', 'Login/' . $paths->page));
    $db->close();
    exit;
  }
  
  $template->header();
  if ( isset($_POST['do_view']) || isset($_POST['do_view_n']) || ( isset($_GET['act']) && isset($_POST['group_id']) ) )
  {
    $gid = ( isset ( $_POST['do_view_n'] ) ) ? intval($_POST['group_id_n']) : intval($_POST['group_id']);
    if ( empty($gid) || $gid < 1 )
    {
      die_friendly('Error', '<p>Hacking attempt</p>');
    }
    $q = $db->sql_query('SELECT group_name,group_type FROM '.table_prefix.'groups WHERE group_id=' . $gid . ';');
    if ( !$q )
    {
      $db->_die();
    }
    $row = $db->fetchrow();
    $db->free_result();
    $members = array();
    $pending = array();
    $q = $db->sql_query('SELECT u.username,u.email,u.reg_time,m.member_id,m.user_id,m.is_mod,m.pending,COUNT(c.comment_id)
                           FROM '.table_prefix.'users AS u
                           LEFT JOIN '.table_prefix.'group_members AS m
                             ON ( m.user_id = u.user_id )
                           LEFT JOIN '.table_prefix.'comments AS c
                             ON ( c.name = u.username )
                           WHERE m.group_id=' . $gid . '
                           GROUP BY u.user_id
                           ORDER BY m.is_mod DESC,u.username ASC;');
    if ( !$q )
    {
      $db->_die();
    }
    
    $is_member = false;
    $is_mod = false;
    $is_pending = false;
    
    while ( $mr = $db->fetchrow() )
    {
      if ( $mr['pending'] == 1 )
      {
        $pending[] = $mr;
        if ( $mr['user_id'] == $session->user_id )
        {
          $is_pending = true;
        }
      }
      else
      {
        $members[] = $mr;
        if ( $mr['user_id'] == $session->user_id )
        {
          $is_member = true;
          if ( $mr['is_mod'] == 1 )
          {
            $is_mod = true;
          }
        }
      }
    }
    
    $status = ( $is_member && $is_mod )
      ? 'You are a moderator of this group.'
      : ( ( $is_member && !$is_mod ) 
        ? 'You are a member of this group.'
        : 'You are not a member of this group.'
        );
      
    $can_do_admin_stuff = ( $is_mod || $session->user_level >= USER_LEVEL_ADMIN );
      
    switch ( $row['group_type'] )
    {
      case GROUP_HIDDEN:  $g_state = 'Hidden group';                break;
      case GROUP_CLOSED:  $g_state = 'Closed group';                break;
      case GROUP_REQUEST: $g_state = 'Members can request to join'; break;
      case GROUP_OPEN:    $g_state = 'Anyone can join';             break;
    }
    
    if ( isset($_GET['act']) && $can_do_admin_stuff )
    {
      switch($_GET['act'])
      {
        case 'update':
          if(!in_array(intval($_POST['group_state']), Array(GROUP_CLOSED, GROUP_OPEN, GROUP_HIDDEN, GROUP_REQUEST)))
          {
            die_friendly('ERROR', '<p>Hacking attempt</p>');
          }
          $q = $db->sql_query('UPDATE '.table_prefix.'groups SET group_type=' . intval($_POST['group_state']) . ' WHERE group_id=' . intval( $_POST['group_id']) . ';');
          if (!$q)
            $db->_die();
          $row['group_type'] = $_POST['group_state'];
          echo '<div class="info-box" style="margin-left: 0;">The group state was updated.</div>';
          break;
        case 'adduser':
          $username = $_POST['add_username'];
          $mod = ( isset($_POST['add_mod']) ) ? '1' : '0';
          
          $q = $db->sql_query('SELECT user_id FROM '.table_prefix.'users WHERE username=\'' . $db->escape($username) . '\';');
          if (!$q)
            $db->_die();
          if ($db->numrows() < 1)
          {
            echo '<div class="error-box">The username you entered could not be found.</div>';
            break;
          }
          $r = $db->fetchrow();
          $db->free_result();
          $uid = intval($r['user_id']);

          // Check if the user is already in the group, and if so, only update modship
          $q = $db->sql_query('SELECT member_id,is_mod FROM '.table_prefix.'group_members WHERE user_id=' . $uid . ' AND group_id=' . intval($_POST['group_id']) . ';');
          if ( !$q )
            $db->_die();
          if ( $db->numrows() > 0 )
          {
            $r = $db->fetchrow();
            if ( (string) $r['is_mod'] != $mod )
            {
              $q = $db->sql_query('UPDATE '.table_prefix.'group_members SET is_mod=' . $mod . ' WHERE member_id=' . $r['member_id'] . ';');
              if ( !$q )
                $db->_die();
              foreach ( $members as $i => $member )
              {
                if ( $member['member_id'] == $r['member_id'] )
                  $members[$i]['is_mod'] = (int)$mod;
              }
              echo '<div class="info-box">The user "' . $username . '" is already in this group, so their moderator status was updated.</div>';
            }
            else
            {
              echo '<div class="info-box">The user "' . $username . '" is already in this group.</div>';
            }
            break;
          }
          
          $db->free_result();
          
          $q = $db->sql_query('INSERT INTO '.table_prefix.'group_members(group_id,user_id,is_mod) VALUES(' . intval($_POST['group_id']) . ', ' . $uid . ', ' . $mod . ');');
          if (!$q)
            $db->_die();
          echo '<div class="info-box">The user "' . $username . '" has been added to this usergroup.</div>';
          
          $q = $db->sql_query('SELECT u.username,u.email,u.reg_time,m.member_id,m.user_id,m.is_mod,COUNT(c.comment_id)
                                 FROM '.table_prefix.'users AS u
                                 LEFT JOIN '.table_prefix.'group_members AS m
                                   ON ( m.user_id = u.user_id )
                                 LEFT JOIN '.table_prefix.'comments AS c
                                   ON ( c.name = u.username )
                                 WHERE m.group_id=' . $gid . '
                                   AND m.pending!=1
                                   AND u.user_id=' . $uid . '
                                 GROUP BY u.user_id
                                 ORDER BY m.is_mod DESC,u.username ASC
                                 LIMIT 1;');
          if ( !$q )
            $db->_die();
          
          $r = $db->fetchrow();
          $members[] = $r;
          $db->free_result();
          
          break;
        case 'del_users':
          foreach ( $members as $i => $member )
          {
            if ( isset($_POST['del_user'][$member['member_id']]) )
            {
              $q = $db->sql_query('DELETE FROM '.table_prefix.'group_members WHERE member_id=' . $member['member_id'] . ';');
              if (!$q)
                $db->_die();
              unset($members[$i]);
            }
          }
          break;
        case 'pending':
          foreach ( $pending as $i => $member )
          {
            if ( isset( $_POST['with_user'][$member['member_id']]) )
            {
              if ( isset ( $_POST['do_appr_pending'] ) )
              {
                $q = $db->sql_query('UPDATE '.table_prefix.'group_members SET pending=0 WHERE member_id=' . $member['member_id'] . ';');
                if (!$q)
                  $db->_die();
                $members[] = $member;
                unset($pending[$i]);
                continue;
              }
              elseif ( isset ( $_POST['do_reject_pending'] ) )
              {
                $q = $db->sql_query('DELETE FROM '.table_prefix.'group_members WHERE member_id=' . $member['member_id'] . ';');
                if (!$q)
                  $db->_die();
                unset($pending[$i]);
              }
            }
          }
          echo '<div class="info-box">Pending members status updated successfully.</div>';
          break;
      }
    }
    
    if ( isset($_GET['act']) && $_GET['act'] == 'update' && !$is_member && $row['group_type'] == GROUP_OPEN )
    {
      $q = $db->sql_query('INSERT INTO '.table_prefix.'group_members(group_id,user_id) VALUES(' . $gid . ', ' . $session->user_id . ');');
      if (!$q)
        $db->_die();
      echo '<div class="info-box">You have been added to this group.</div>';
      
      $q = $db->sql_query('SELECT u.username,u.email,u.reg_time,m.member_id,m.user_id,m.is_mod,COUNT(c.comment_id)
                             FROM '.table_prefix.'users AS u
                             LEFT JOIN '.table_prefix.'group_members AS m
                               ON ( m.user_id = u.user_id )
                             LEFT JOIN '.table_prefix.'comments AS c
                               ON ( c.name = u.username )
                             WHERE m.group_id=' . $gid . '
                               AND m.pending!=1
                               AND u.user_id=' . $session->user_id . '
                             GROUP BY u.user_id
                             ORDER BY m.is_mod DESC,u.username ASC
                             LIMIT 1;');
      if ( !$q )
        $db->_die();
      
      $r = $db->fetchrow();
      $members[] = $r;
      $db->free_result();
      
    }
    
    if ( isset($_GET['act']) && $_GET['act'] == 'update' && !$is_member && $row['group_type'] == GROUP_REQUEST && !$is_pending )
    {
      $q = $db->sql_query('INSERT INTO '.table_prefix.'group_members(group_id,user_id,pending) VALUES(' . $gid . ', ' . $session->user_id . ', 1);');
      if (!$q)
        $db->_die();
      echo '<div class="info-box">A request has been sent to the moderator(s) of this group to add you.</div>';
    }
    
    $state_btns = ( $can_do_admin_stuff ) ?
                  '<label><input type="radio" name="group_state" value="' . GROUP_HIDDEN . '" ' . (( $row['group_type'] == GROUP_HIDDEN ) ? 'checked="checked"' : '' ) . ' /> Hidden group</label>
                   <label><input type="radio" name="group_state" value="' . GROUP_CLOSED . '" ' . (( $row['group_type'] == GROUP_CLOSED ) ? 'checked="checked"' : '' ) . ' /> Closed group</label>
                   <label><input type="radio" name="group_state" value="' . GROUP_REQUEST. '" ' . (( $row['group_type'] == GROUP_REQUEST) ? 'checked="checked"' : '' ) . ' /> Members can request to join</label>
                   <label><input type="radio" name="group_state" value="' . GROUP_OPEN   . '" ' . (( $row['group_type'] == GROUP_OPEN   ) ? 'checked="checked"' : '' ) . ' /> Anybody can join</label>'
                   : $g_state;
    if ( !$can_do_admin_stuff && $row['group_type'] == GROUP_REQUEST && !$is_member )
    {
      if ( $is_pending )
        $state_btns .= ' (Your request to join is awaiting approval)';
      else
        $state_btns .= ' <input type="submit" value="Request membership" />';
    }
    
    if ( !$can_do_admin_stuff && $row['group_type'] == GROUP_OPEN && !$is_member )
    {
      $state_btns .= ' <input type="submit" value="Join this group" />';
    }
    
    echo '<form action="' . makeUrl($paths->page, 'act=update') . '" method="post" enctype="multipart/form-data">
          <div class="tblholder">
            <table border="0" cellspacing="1" cellpadding="4">
              <tr>
                <th colspan="2">Group information</th>
              </tr>
              <tr>
                <td class="row2">Group name:</td>
                <td class="row1">' . $row['group_name'] . '</td>
              </tr>
              <tr>
                <td class="row2">Membership status:</td>
                <td class="row1">' . $status . '</td>
              </tr>
              <tr>
                <td class="row2">Group state:</td>
                <td class="row1">' . $state_btns . '</td>
              </tr>   
              ' . ( ( $is_mod || $session->user_level >= USER_LEVEL_ADMIN ) ? '
              <tr>
                <th class="subhead" colspan="2">
                  <input type="submit" value="Save changes" />
                </th>
              </tr>
              ' : '' ) . '
            </table>
          </div>
          <input name="group_id" value="' . $gid . '" type="hidden" />
          </form>';
    if ( sizeof ( $pending ) > 0 && $can_do_admin_stuff )
    {
      echo '<form action="' . makeUrl($paths->page, 'act=pending') . '" method="post" enctype="multipart/form-data">
            <input name="group_id" value="' . $gid . '" type="hidden" />
            <h2>Pending memberships</h2>
            <div class="tblholder">
            <table border="0" cellspacing="1" cellpadding="4">
              <tr>
                <th>Username</th>
                <th>E-mail</th>
                <th>Registered</th>
                <th>Total comments</th>
                <th>Select</th>
              </tr>';
      $cls = 'row2';
      foreach ( $pending as $member )
      {
        
        $date = date('F d, Y', $member['reg_time']);
        $cls = ( $cls == 'row2' ) ? 'row1' : 'row2';
        $addy = $email->encryptEmail($member['email']);
        
        echo "<tr>
                <td class='{$cls}'>{$member['username']}</td>
                <td class='{$cls}'>{$addy}</td>
                <td class='{$cls}'>{$date}</td>
                <td class='{$cls}'>{$member['COUNT(c.comment_id)']}</td>
                <td class='{$cls}' style='text-align: center;'><input type='checkbox' name='with_user[{$member['member_id']}]' /></td>
              </tr>";
      }
      echo '</table>
            </div>
            <div style="margin: 10px 0 0 auto;">
              With selected: 
              <input type="submit" name="do_appr_pending" value="Approve membership" />
              <input type="submit" name="do_reject_pending" value="Reject membership" />
            </div>
            </form>';
    }
    echo '<form action="' . makeUrl($paths->page, 'act=del_users') . '" method="post" enctype="multipart/form-data">
          <h2>Group members</h2>
          <div class="tblholder">
            <table border="0" cellspacing="1" cellpadding="4">
              <tr>
                <th>Username</th>
                <th>E-mail</th>
                <th>Registered</th>
                <th>Total comments</th>
                ' . ( ( $can_do_admin_stuff ) ? "
                <th>Remove?</th>
                " : '' ) . '
              </tr>
              <tr>
                <th colspan="5" class="subhead">Group moderators</th>
              </tr>';
    $mod_printed = false;
    $mem_printed = false;
    $cls = 'row2';
    
    foreach ( $members as $member )
    {
      if ( $member['is_mod'] != 1 )
        break;
      
      $date = date('F d, Y', $member['reg_time']);
      $cls = ( $cls == 'row2' ) ? 'row1' : 'row2';
      $addy = $email->encryptEmail($member['email']);
      
      $mod_printed = true;
      
      echo "<tr>
              <td class='{$cls}'>{$member['username']}</td>
              <td class='{$cls}'>{$addy}</td>
              <td class='{$cls}'>{$date}</td>
              <td class='{$cls}'>{$member['COUNT(c.comment_id)']}</td>
              " . ( ( $can_do_admin_stuff ) ? "
              <td class='{$cls}' style='text-align: center;'><input type='checkbox' name='del_user[{$member['member_id']}]' /></td>
              " : '' ) . "
            </tr>";
    }
    if (!$mod_printed)
      echo '<tr><td class="' . $cls . '" colspan="5">This group has no moderators.</td></th>';
    echo '<tr><th class="subhead" colspan="5">Group members</th></tr>';
    foreach ( $members as $member )
    {
      if ( $member['is_mod'] == 1 )
        continue;
      
      $date = date('F d, Y', $member['reg_time']);
      $cls = ( $cls == 'row2' ) ? 'row1' : 'row2';
      $addy = $email->encryptEmail($member['email']);
      
      $mem_printed = true;
      
      echo "<tr>
              <td class='{$cls}'>{$member['username']}</td>
              <td class='{$cls}'>{$addy}</td>
              <td class='{$cls}'>{$date}</td>
              <td class='{$cls}'>{$member['COUNT(c.comment_id)']}</td>
              " . ( ( $can_do_admin_stuff ) ? "
              <td class='{$cls}' style='text-align: center;'><input type='checkbox' name='del_user[{$member['member_id']}]' /></td>
              " : '' ) . "
            </tr>";
    }
    if (!$mem_printed)
      echo '<tr><td class="' . $cls . '" colspan="5">This group has no members.</td></th>';
    echo '  </table>
          </div>';
    if ( $can_do_admin_stuff )
    {
      echo "<div style='margin: 10px 0 0 auto;'><input type='submit' name='do_del_user' value='Remove selected users' /></div>";
    }
    echo '<input name="group_id" value="' . $gid . '" type="hidden" />
          </form>';
    if ( $can_do_admin_stuff )
    {
      echo '<form action="' . makeUrl($paths->page, 'act=adduser') . '" method="post" enctype="multipart/form-data" onsubmit="if(!submitAuthorized) return false;">
              <div class="tblholder">
                <table border="0" cellspacing="1" cellpadding="4">
                  <tr>
                    <th colspan="2">Add a new member to this group</th>
                  </tr>
                  <tr>
                    <td class="row2">Username:</td><td class="row1">' . $template->username_field('add_username') . '</td>
                  </tr>
                  <tr>
                    <td class="row2">Group moderator:</td><td class="row1"><label><input type="checkbox" name="add_mod" /> User is a group moderator</label></td>
                  </tr>
                  <tr>
                    <th class="subhead" colspan="2">
                      <input type="submit" value="Add member" />
                    </th>
                  </tr>
                </table>
              </div>
              <input name="group_id" value="' . $gid . '" type="hidden" />
            </form>';
    }
  }
  else
  {
    echo '<form action="'.makeUrlNS('Special', 'Usergroups').'" method="post" onsubmit="if(!submitAuthorized) return false;" enctype="multipart/form-data">';
    echo '<div class="tblholder">
          <table border="0" style="width: 100%;" cellspacing="1" cellpadding="4">
            <tr>
              <th colspan="2">Group membership details</th>
            </tr>
            <tr>
              <td class="row2" style="text-align: right; width: 50%;">
                Current group memberships:
              </td>
              <td class="row1" style="width: 50%;">';
    $taboo = Array('Everyone');
    if ( sizeof ( $session->groups ) > count($taboo) )
    {
      echo '<select name="group_id">';
      foreach ( $session->groups as $id => $group )
      {
        $taboo[] = $group;
        if ( $group != 'Everyone' )
        {
          echo '<option value="' . $id . '">' . $group . '</option>';
        }
      }
      echo '</select>
            <input type="submit" name="do_view" value="View information" />';
    }
    else
    {
      echo 'None';
    }
    
    echo '</td>
        </tr>';
    $taboo = 'WHERE group_name != \'' . implode('\' AND group_name != \'', $taboo) . '\'';
    $q = $db->sql_query('SELECT group_id,group_name FROM '.table_prefix.'groups '.$taboo.' AND group_type != ' . GROUP_HIDDEN . ' ORDER BY group_name ASC;');
    if(!$q)
    {
      echo $db->get_error();
      $template->footer();
      return;
    }
    if($db->numrows() > 0)
    {
      echo '<tr>
              <td class="row2" style="text-align: right;">
                Non-memberships:
              </td>
              <td class="row1">
              <select name="group_id_n">';
      while ( $row = $db->fetchrow() )
      {
        if ( $row['group_name'] != 'Everyone' )
        {
          echo '<option value="' . $row['group_id'] . '">' . $row['group_name'] . '</option>';
        }
      }
      echo '</select>
            <input type="submit" name="do_view_n" value="View information" />
          </td>
        </tr>
      ';
    }
    $db->free_result();
    echo '</table>
        </div>
        </form>';
  }
  $template->footer();
}

?>