<?php

/*

 * Nuggie

 * Version 0.1

 * 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.

 */

/**

 * Displays a planet as requested by a PageProcessor instance.

 * @param string The page_id from PageProcessor.

 */

function nuggie_planet_uri_handler($page)

{

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

  $planet_id = dirtify_page_id($page->page_id);

  $offset = 0;

  if ( preg_match('#/start=([0-9]+)$#', $planet_id, $match) )

  {

    $planet_id = substr($planet_id, 0, (strlen($planet_id) - strlen($match[0])));

    $offset = intval($match[1]);

  }

  //

  // VALIDATION

  //

  // Fetch ACLs

  $perms = $session->fetch_page_acl($planet_id, 'Planet');

  // Obtain planet info

  $q = $db->sql_query('SELECT p.planet_id, p.planet_name, p.planet_subtitle, p.planet_creator, p.planet_public, p.planet_visible, m.mapping_type, m.mapping_value ' . "\n"

                    . '  FROM ' . table_prefix . "planets AS p\n"

                    . "  LEFT JOIN " . table_prefix . "planets_mapping AS m\n"

                    . "    ON ( p.planet_id = m.planet_id )\n"

                    . "  WHERE p.planet_name = '" . $db->escape(sanitize_page_id($planet_id)) . "';");

  if ( !$q )

    $db->_die();

  if ( $db->numrows() < 1 )

  {

    // planet not found, fall out

    return $page->err_page_not_existent();

  }

  // fetch first row, then seek back to the first result to allow mapping fetching later

  $planet_data = $db->fetchrow();

  $db->sql_data_seek(0);

  // check author and publicity

  if ( $planet_data['planet_creator'] != $session->user_id && !$planet_data['planet_public'] )

  {

    return $page->err_access_denied();

  }

  // ACL check

  if ( !$perms->get_permissions('read') )

  {

    return $page->err_access_denied();

  }

  // Set page title

  $page_title = dirtify_page_id($planet_data['planet_name']);

  $template->assign_vars(array(

      'PAGE_NAME' => htmlspecialchars($page_title)

    ));

  // Try to grab the posts. The SQL tricks here are rather interesting, you'll have to look at it from a distance to grasp it.

  // Basically just using MySQL to apply all the filters in one go. Nuggie doesn't do PostgreSQL yet.

  $sql_base = "SELECT <columns>\n"

       . "  FROM " . table_prefix . "blog_posts AS p\n"

       . "  LEFT JOIN " . table_prefix . "blogs AS b\n"

       . "    ON ( b.user_id = p.post_author )\n"

       . "  LEFT JOIN " . table_prefix . "users AS u\n"

       . "    ON ( u.user_id = p.post_author )\n"

       . "  LEFT JOIN " . table_prefix . "comments AS c\n"

       . "    ON ( c.page_id = CAST(p.post_id AS char) AND c.namespace = 'BlogPost' )\n"

       . "  LEFT JOIN " . table_prefix . "tags AS t\n"

       . "    ON ( t.page_id = CAST(p.post_id AS char) AND t.namespace = 'BlogPost' )\n"

       . "  LEFT JOIN " . table_prefix . "planets_mapping AS m\n"

       . "    ON (\n"

       . "         ( m.mapping_type = " . NUGGIE_PLANET_FILTER_TAG . " AND m.mapping_value = t.tag_name  ) OR\n"

       . "         ( m.mapping_type = " . NUGGIE_PLANET_FILTER_AUTHOR . " AND CAST(m.mapping_value AS unsigned integer) = p.post_author ) OR\n"

       . "         ( m.mapping_type = " . NUGGIE_PLANET_FILTER_KEYWORD . " AND ( p.post_text LIKE CONCAT('%', m.mapping_value, '%') OR p.post_title LIKE CONCAT('%', m.mapping_value, '%') ) )\n"

       . "       )\n"

       . "  WHERE m.planet_id = {$planet_data['planet_id']}\n"

       . "    AND p.post_published = 1\n"

       . "  GROUP BY p.post_id\n"

       . "  ORDER BY p.post_timestamp DESC\n"

       . "  <limit>;";

  // pass 1: a test run to count the number of results

  $sql = str_replace('<columns>', 'p.post_id', $sql_base);

  $sql = str_replace('<limit>', "", $sql);

  $q = $db->sql_query($sql);

  if ( !$q )

    $db->_die();

  $count = $db->numrows();

  $db->free_result($sql);

  // pass 2: production run

  $columns = 'p.post_id, p.post_title, p.post_title_clean, p.post_author, p.post_timestamp, p.post_text, b.blog_name, b.blog_subtitle, b.blog_type, b.allowed_users, u.username, u.user_level, COUNT(c.comment_id) AS num_comments, \'' . $db->escape($planet_id) . '\' AS referring_planet';

  $sql = str_replace('<columns>', $columns, $sql_base);

  // yea. that was one query.

  $q = $db->sql_query($sql);

  if ( !$q )

    $db->_die();

  // just let the paginator do the rest

  $postbit = new NuggiePostbit();

  // $q, $tpl_text, $num_results, $result_url, $start = 0, $perpage = 10, $callers = Array(), $header = '', $footer = ''

  $html = paginate(

      $q,

      '{post_id}',

      $count,

      makeUrlNS('Planet', "$planet_id/start=%s", true),

      0,

      10,

      array( 'post_id' => array($postbit, 'paginate_handler') ),

      '<span class="menuclear"></span>'

    );

  $db->free_result($q);

  $template->add_header('<link rel="stylesheet" type="text/css" href="' . scriptPath . '/plugins/nuggie/style.css" />');

  $template->header();

  echo $planet_data['planet_subtitle'];

  echo $html;

  $template->footer();

}

?>