<?php

class ModuleReferrer extends Module
{
  var $Excludes;

  function __construct(System $System)
  {
    parent::__construct($System);
    $this->Name = 'Referrer';
    $this->Version = '1.0';
    $this->Creator = 'Chronos';
    $this->License = 'GNU/GPL';
    $this->Description = 'Log visitor HTTP referrer URLs to database for later evaluation.';
    $this->Dependencies = array();

    $this->Excludes = array();
  }

  function DoStart(): void
  {
    $this->Excludes[] = Core::Cast($this->System)->Config['Web']['Host'];
    $this->Log();
    $this->System->RegisterPage(['referrer'], 'PageReferrer');
    Core::Cast($this->System)->RegisterMenuItem(array(
      'Title' => T('Promotion'),
      'Hint' => 'Informace k propagaci tohoto projektu',
      'Link' => $this->System->Link('/referrer/'),
      'Permission' => LICENCE_ANONYMOUS,
      'Icon' => '',
    ));
  }

  function Log()
  {
    if (array_key_exists('HTTP_REFERER', $_SERVER))
    {
      $Referrer = addslashes($_SERVER['HTTP_REFERER']);
      $HostName = substr($Referrer, strpos($Referrer, '/') + 2);
      $HostName = substr($HostName, 0, strpos($HostName, '/'));
      if (!in_array($HostName, $this->Excludes))
      {
        $IP = GetRemoteAddress();

        // Check if client IP is not blaclisted as spam source. If yes then add new referrer as invisible
        $DbResult = $this->System->Database->query('SELECT COUNT(*) FROM `BlackList` WHERE `IP` = "'.$IP.'"');
        $DbRow = $DbResult->fetch_row();
        if ($DbRow[0] == 0)
        {
          $Visible = '1';
          $Description = '';
        } else
        {
          $Visible = '0';
          $Description = 'Spam';
        }

        // Check if host name is already stored and need just to update hit counter
        $DbResult = $this->System->Database->query('SELECT `Id` FROM `Referrer` WHERE `Web` = "'.$HostName.'"');
        if ($DbResult->num_rows > 0)
        {
          $DbRow = $DbResult->fetch_assoc();
          $this->System->Database->query('UPDATE `Referrer` SET `Hits` = `Hits` + 1, `DateLast` = NOW(), `LastURL` = "'.
           addslashes($Referrer).'", `LastIP` = "'.$IP.'" WHERE `Id` = '.$DbRow['Id']);
        } else
        {
          $this->System->Database->query('INSERT INTO `Referrer` (`Web`, `DateFirst`, `DateLast`, `LastURL`, `Hits`, `LastIP`, `Visible`, `Description`) '.
          'VALUES ("'.$HostName.'", NOW(), NOW( ), "'.addslashes($Referrer).'", 1, "'.$IP.'", '.$Visible.', "'.$Description.'")');
        }
      }
    }
  }
}

class PageReferrer extends Page
{
  function ShowList()
  {
    $User = ModuleUser::Cast($this->System->GetModule('User'))->User;
    $Banner = '<a href="https://'.Core::Cast($this->System)->Config['Web']['Host'].$this->System->Link('/').'">'.
      '<img src="https://'.Core::Cast($this->System)->Config['Web']['Host'].$this->System->Link('/banners/wowpreklad_big.jpg').'" '.
      'alt="wowpreklad" title="Otevřený projekt překládání celé hry World of Warcraft" '.
      'class="banner" height="60" width="468" /></a>';

    $BannerSmall = '<a href="https://'.Core::Cast($this->System)->Config['Web']['Host'].$this->System->Link('/').'">'.
      '<img src="https://'.Core::Cast($this->System)->Config['Web']['Host'].$this->System->Link('/banners/wowpreklad_small.jpg').'" '.
      'alt="wowpreklad" title="Otevřený projekt překládání celé hry World of Warcraft" '.
      'class="banner" height="31" width="88" /></a>';

    $Output = '<strong>'.T('Banners').':</strong><br />';

    $Output .= $Banner.' &nbsp;&nbsp;<textarea rows="2" cols="30">'.htmlspecialchars($Banner).'</textarea><br />';
    $Output .= $BannerSmall.' &nbsp;&nbsp;<textarea rows="2" cols="30">'.htmlspecialchars($BannerSmall).'</textarea><br />';

    if ($User->Licence(LICENCE_ADMIN)) 
    {
      $MonthAge = 3;
      $YesNo = array('Ne', 'Ano');
      $Output .= '<br/><strong>'.T('Servers referring to us').':</strong> <br />'.
        '<div style="font-size: 10px;">Seznam je automaticky aktualizován a zobrazeny jsou servery, ze kterých přišli uživatelé během posledních třech měsíců řazený sestupně dle nejnovějších.</div><br />';

      if (!$User->Licence(LICENCE_ADMIN)) $Where = ' WHERE (`Visible`=1) AND (`Parent` IS NULL)';
        else $Where = '';
      $Query = 'SELECT *, (SELECT Web FROM `Referrer` AS T4 WHERE T4.Id = T3.Parent) AS ParentName '.
        'FROM (SELECT *, '.
        '(`Hits` + COALESCE((SELECT SUM(`Hits`) FROM '.
        '`Referrer` AS `T1` WHERE `T1`.`Parent` = `T2`.`Id`), 0)) AS `TotalHits`, '.
        'GREATEST(`DateLast`, COALESCE((SELECT MAX(`DateLast`) FROM '.
        '`Referrer` AS `T1` WHERE `T1`.`Parent` = `T2`.`Id`), 0)) AS `MaxDateLast` FROM '.
        '`Referrer` AS `T2` '.$Where.') AS `T3` '.
        'WHERE (`T3`.`MaxDateLast` > (NOW() - INTERVAL '.$MonthAge.' MONTH))';

      $DbResult = $this->Database->query('SELECT COUNT(*) FROM ('.$Query.') AS T');
      $DbRow = $DbResult->fetch_row();
      $PageList = GetPageList($DbRow[0]);

      $Output .= $PageList['Output'].
        '<table class="BaseTable">';

      $TableColumns = array(
        array('Name' => 'Web', 'Title' => T('Address')),
        array('Name' => 'MaxDateLast', 'Title' => T('Last visit')),
        array('Name' => 'TotalHits', 'Title' => T('Hits')),
      );
      if ($User->Licence(LICENCE_ADMIN))
      {
        $TableColumns[] = array('Name' => 'Visible', 'Title' => T('Visible'));
        $TableColumns[] = array('Name' => 'Parent', 'Title' => T('Parent'));
        $TableColumns[] = array('Name' => 'Description', 'Title' => T('Comment'));
        $TableColumns[] = array('Name' => 'LastIP', 'Title' => T('Last IP address'));
        $TableColumns[] = array('Name' => 'Action', 'Title' => T('Actions'));
      }
      $Order = GetOrderTableHeader($TableColumns, 'MaxDateLast', 1);
      $Output .= $Order['Output'];

      $Query .= $Order['SQL'].$PageList['SQLLimit'];

      $DbResult = $this->Database->query($Query);
      while ($Line = $DbResult->fetch_assoc())
      {
        $Output .= '<tr><td><a href="'.$Line['LastURL'].'">'.$Line['Web'].'</a></td>'.
          '<td>'.HumanDate($Line['MaxDateLast']).'</td>'.
          '<td>'.$Line['TotalHits'].'</td>';
        if ($User->Licence(LICENCE_ADMIN))
        {
          $Output .=
          '<td>'.$YesNo[$Line['Visible']].'</td>'.
          '<td>'.$Line['ParentName'].'</td>'.
          '<td>'.$Line['Description'].'</td>'.
          '<td>'.$Line['LastIP'].'</td>'.
          '<td><a href="?action=edit&amp;id='.$Line['Id'].'">'.T('Modify').'</a> '.
          '<a href="?action=spam&amp;id='.$Line['Id'].'">'.T('Spam').'</a></td>';
        }
        $Output .= '</tr>';
      }
      $Output .= '</table>';
      $Output .= $PageList['Output'];
    }
    return $Output;
  }

  function SelectParentItem($Selected, $Self)
  {
    $Output = '<select name="Parent">';
    $Output .= '<option value=""';
    if ($Selected == '')
      $Output .= ' selected="selected"';
    $Output .= '></option>';
    $DbResult = $this->Database->select('Referrer', '`Id`, `Web`', '`Parent` IS NULL ORDER BY `Web`');
    while ($Language = $DbResult->fetch_assoc())
    if ($Language['Id'] != $Self)
    {
      $Output .= '<option value="'.$Language['Id'].'"';
      if ($Selected == $Language['Id'])
        $Output .= ' selected="selected"';
      $Output .= '>'.$Language['Web'].'</option>';
    }
    $Output .= '</select>';
    return $Output;
  }

  function Spam()
  {
    $User = ModuleUser::Cast($this->System->GetModule('User'))->User;
    if ($User->Licence(LICENCE_ADMIN))
    {
      if (array_key_exists('id', $_GET))
      {
        $DbResult = $this->Database->select('Referrer', '*', 'Id='.$_GET['id']);
        if ($DbResult->num_rows > 0)
        {
          $Item = $DbResult->fetch_assoc();
          $this->Database->update('Referrer', 'Id='.$_GET['id'], array('Visible' => 0, 'Description' => 'Spam'));
          $DbResult2 = $this->Database->select('BlackList', '*', 'IP="'.$Item['LastIP'].'"');
          if ($DbResult2->num_rows == 0)
          {
            $this->Database->insert('BlackList', array('Time' => 'NOW()', 'IP' => $Item['LastIP']));
          }
          $Output = ShowMessage(T('Set as spam'), MESSAGE_CRITICAL);
          $Output .= $this->ShowList();
        } else $Output = ShowMessage(T('Item not found'), MESSAGE_CRITICAL);
      } else $Output = ShowMessage(T('Item not specified'), MESSAGE_CRITICAL);
    } else $Output = ShowMessage(T('Access denied'), MESSAGE_CRITICAL);
    return $Output;
  }

  function Edit()
  {
    $User = ModuleUser::Cast($this->System->GetModule('User'))->User;
    if ($User->Licence(LICENCE_ADMIN))
    {
      if (array_key_exists('id', $_GET))
      {
        $DbResult = $this->Database->select('Referrer', '*', 'Id='.$_GET['id']);
        if ($DbResult->num_rows > 0)
        {
          $Item = $DbResult->fetch_assoc();
          if ($Item['Visible'] == 1) $Visible = ' checked ';
            else $Visible = '';
          $Output = '<form action="?action=editsave&amp;id='.$_GET['id'].'" method="post"><table>'.
            '<tr><td>'.T('Web').'</td><td>'.$Item['Web'].'</td></tr>'.
            '<tr><td>'.T('Visible').'</td><td><input type="checkbox" name="Visible" '.$Visible.'/></td></tr>'.
            '<tr><td>'.T('Description').'</td><td><input type="text" name="Description" value="'.$Item['Description'].'"/></td></tr>'.
            '<tr><td>'.T('Parent item').'</td><td>'.$this->SelectParentItem($Item['Parent'], $Item['Id']).'</td></tr>'.
            '<tr><td>'.T('Last IP address').'</td><td><input type="text" name="LastIP" value="'.$Item['LastIP'].'"/></td></tr>'.
            '<tr><td colspan="2"><input type="submit" value="Uložit"/></td></tr></table></form>';
        } else $Output = ShowMessage(T('Item not found'), MESSAGE_CRITICAL);
      } else $Output = ShowMessage(T('Item not specified'), MESSAGE_CRITICAL);
    } else $Output = ShowMessage(T('Access denied'), MESSAGE_CRITICAL);
    return $Output;
  }

  function EditSave()
  {
    $User = ModuleUser::Cast($this->System->GetModule('User'))->User;
    if ($User->Licence(LICENCE_ADMIN))
    {
      if ($_POST['Parent'] == '') $_POST['Parent'] = null;
      $_POST['Visible'] = array_key_exists('Visible', $_POST);
      $DbResult = $this->Database->update('Referrer', 'Id='.$_GET['id'], array(
        'Visible' => $_POST['Visible'], 'LastIP' => $_POST['LastIP'],
        'Parent' => $_POST['Parent'], 'Description' => $_POST['Description']));
      $_SERVER['QUERY_STRING'] = '';
      $Output = ShowMessage(T('Settings saved'));
      $Output .= $this->ShowList();
    } else $Output = ShowMessage(T('Access denied'), MESSAGE_CRITICAL);
    return $Output;
  }

  function Show(): string
  {
    $this->Title = T('Promotion');
    if (array_key_exists('action', $_GET))
    {
      if ($_GET['action'] == 'edit') $Output = $this->Edit();
      else if ($_GET['action'] == 'spam') $Output = $this->Spam();
      else if ($_GET['action'] == 'editsave') $Output = $this->EditSave();
      else $Output = $this->ShowList();
    } else $Output = $this->ShowList();
    return $Output;
  }
}
