<?php

/**
 * @file
 * User page callbacks for the linkchecker module.
 */

/**
 * Menu callback for general reporting.
 *
 * @return string
 *   Themed report page.
 */
function linkchecker_admin_report_page() {

  $ignore_response_codes = preg_split('/(\r\n?|\n)/', variable_get('linkchecker_ignore_response_codes', "200\n206\n302\n304\n401\n403"));

  // Search for broken links in nodes and comments and blocks of all users.
  // @todo Try to make UNION'ed subselect resultset smaller.
  $subquery4 = db_select('linkchecker_node', 'ln')
    ->distinct()
    ->fields('ln', array('lid'));

  $subquery3 = db_select('linkchecker_comment', 'lc')
    ->distinct()
    ->fields('lc', array('lid'));

  $subquery2 = db_select('linkchecker_block_custom', 'lb')
    ->distinct()
    ->fields('lb', array('lid'));

  // UNION all linkchecker type tables.
  $subquery1 = db_select($subquery2->union($subquery3)->union($subquery4), 'q1')->fields('q1', array('lid'));

  // Build pager query.
  $query = db_select('linkchecker_link', 'll')->extend('PagerDefault')->extend('TableSort');
  $query->innerJoin($subquery1, 'q2', 'q2.lid = ll.lid');
  $query->fields('ll');
  $query->condition('ll.last_checked', 0, '<>');
  $query->condition('ll.status', 1);
  $query->condition('ll.code', $ignore_response_codes, 'NOT IN');

  return _linkchecker_report_page($query);
}

/**
 * Menu callback for author specific reporting.
 *
 * @param object $account
 *   The user account.
 *
 * @return string
 *   Themed report page.
 */
function linkchecker_user_report_page($account) {
  drupal_set_title($account->name);

  $ignore_response_codes = preg_split('/(\r\n?|\n)/', variable_get('linkchecker_ignore_response_codes', "200\n206\n302\n304\n401\n403"));

  // Build query for broken links in nodes of the current user.
  $subquery2 = db_select('node', 'n');
  $subquery2->innerJoin('node_revision', 'r', 'r.vid = n.vid');
  $subquery2->innerJoin('linkchecker_node', 'ln', 'ln.nid = n.nid');
  $subquery2->innerJoin('linkchecker_link', 'll', 'll.lid = ln.lid');
  $subquery2->condition('ll.last_checked', 0, '<>');
  $subquery2->condition('ll.status', 1);
  $subquery2->condition('ll.code', $ignore_response_codes, 'NOT IN');
  $subquery2->condition(db_or()
    ->condition('n.uid', $account->uid)
    ->condition('r.uid', $account->uid)
  );
  $subquery2->distinct();
  $subquery2->fields('ll', array('lid'));

  $comment_types = linkchecker_scan_comment_types();
  if (!empty($comment_types)) {
    // Build query for broken links in nodes and comments of the current user.
    $subquery3 = db_select('comment', 'c');
    $subquery3->innerJoin('linkchecker_comment', 'lc', 'lc.cid = c.cid');
    $subquery3->innerJoin('linkchecker_link', 'll', 'll.lid = lc.lid');
    $subquery3->condition('ll.last_checked', 0, '<>');
    $subquery3->condition('ll.status', 1);
    $subquery3->condition('ll.code', $ignore_response_codes, 'NOT IN');
    $subquery3->condition('c.uid', $account->uid);
    $subquery3->distinct();
    $subquery3->fields('ll', array('lid'));

    // UNION the linkchecker_node and linkchecker_comment tables.
    $subquery1 = db_select($subquery2->union($subquery3), 'q1')->fields('q1', array('lid'));
  }
  else {
    // Build query for broken links in nodes of the current user.
    $subquery1 = db_select($subquery2, 'q1')->fields('q1', array('lid'));
  }

  // Build pager query.
  $query = db_select('linkchecker_link', 'll')->extend('PagerDefault')->extend('TableSort');
  $query->innerJoin($subquery1, 'q2', 'q2.lid = ll.lid');
  $query->fields('ll');
  $query->condition('ll.last_checked', 0, '<>');
  $query->condition('ll.status', 1);
  $query->condition('ll.code', $ignore_response_codes, 'NOT IN');

  return _linkchecker_report_page($query, $account);
}

/**
 * Builds the HTML report page table with pager.
 *
 * @param SelectQueryInterface $query
 *   The pager query for the report page. Can be per user report or global.
 * @param object|null $account
 *   The user account object.
 *
 * @return string
 *   Themed report page.
 */
function _linkchecker_report_page($query, $account = NULL) {

  $links_unchecked = db_query('SELECT COUNT(1) FROM {linkchecker_link} WHERE last_checked = :last_checked AND status = :status', array(':last_checked' => 0, ':status' => 1))->fetchField();
  if ($links_unchecked > 0) {
    $links_all = db_query('SELECT COUNT(1) FROM {linkchecker_link} WHERE status = :status', array(':status' => 1))->fetchField();
    drupal_set_message(format_plural($links_unchecked,
      'There is 1 unchecked link of about @links_all links in the database. Please be patient until all links have been checked via cron.',
      'There are @count unchecked links of about @links_all links in the database. Please be patient until all links have been checked via cron.',
      array('@links_all' => $links_all)), 'warning');
  }

  $header = array(
    array('data' => t('URL'), 'field' => 'url', 'sort' => 'desc'),
    array('data' => t('Response'), 'field' => 'code', 'sort' => 'desc'),
    array('data' => t('Error'), 'field' => 'error'),
    array('data' => t('Operations')),
  );

  $result = $query
    ->limit(50)
    ->orderByHeader($header)
    ->execute();

  // Evaluate permission once for performance reasons.
  $access_edit_link_settings = user_access('edit link settings');
  $access_administer_blocks = user_access('administer blocks');
  $access_administer_redirects = user_access('administer redirects');

  $rows = array();
  foreach ($result as $link) {
    // Get the node, block and comment IDs that refer to this broken link and
    // that the current user has access to.
    $nids = _linkchecker_link_node_ids($link, $account);
    $cids = _linkchecker_link_comment_ids($link, $account);
    $bids = _linkchecker_link_block_ids($link);

    // If the user does not have access to see this link anywhere, do not
    // display it, for reasons explained in _linkchecker_link_access(). We
    // still need to fill the table row, though, so as not to throw off the
    // number of items in the pager.
    if (empty($nids) && empty($cids) && empty($bids)) {
      $rows[] = array(array('data' => t('Permission restrictions deny you access to this broken link.'), 'colspan' => count($header)));
      continue;
    }

    $links = array();

    // Show links to link settings.
    if ($access_edit_link_settings) {
      $links[] = l(t('Edit link settings'), 'linkchecker/' . $link->lid . '/edit', array('query' => drupal_get_destination()));
    }

    // Show link to nodes having this broken link.
    foreach ($nids as $nid) {
      $links[] = l(t('Edit node @node', array('@node' => $nid)), 'node/' . $nid . '/edit', array('query' => drupal_get_destination()));
    }

    // Show link to comments having this broken link.
    $comment_types = linkchecker_scan_comment_types();
    if (module_exists('comment') && !empty($comment_types)) {
      foreach ($cids as $cid) {
        $links[] = l(t('Edit comment @comment', array('@comment' => $cid)), 'comment/' . $cid . '/edit', array('query' => drupal_get_destination()));
      }
    }

    // Show link to blocks having this broken link.
    if ($access_administer_blocks) {
      foreach ($bids as $bid) {
        $links[] = l(t('Edit block @block', array('@block' => $bid)), 'admin/structure/block/manage/block/' . $bid . '/configure', array('query' => drupal_get_destination()));
      }
    }

    // Show link to redirect this broken internal link.
    if (module_exists('redirect') && $access_administer_redirects && _linkchecker_is_internal_url($link)) {
      $links[] = l(t('Create redirection'), 'admin/config/search/redirect/add', array('query' => array('source' => $link->internal, drupal_get_destination())));
    }

    // Create table data for output.
    $rows[] = array(
      'data' => array(
        l(_filter_url_trim($link->url, 40), $link->url),
        $link->code,
        check_plain($link->error),
        theme('item_list', array('items' => $links)),
      ),
    );
  }

  $build['linkchecker_table'] = array(
    '#theme' => 'table',
    '#header' => $header,
    '#rows' => $rows,
    '#empty' => t('No broken links have been found.'),
  );
  $build['linkchecker_pager'] = array('#theme' => 'pager');

  return $build;
}

/**
 * Check if the link is an internal URL or not.
 *
 * @param object $link
 *   Link object.
 *
 * @return bool
 *   TRUE if link is internal, otherwise FALSE.
 */
function _linkchecker_is_internal_url(&$link) {
  global $base_url;

  if (strpos($link->url, $base_url) === 0) {
    $link->internal = trim(substr($link->url, strlen($base_url)), " \t\r\n\0\\/");
    return TRUE;
  }
}