<?php
// $Id: domain_source.module,v 1.41 2011-01-04 15:08:32 agentken Exp $

/**
 * @defgroup domain_source Domain Source: editor-defined links.
 *
 * Creates a canonical source domain for linking to content from other domains.
 */

/**
 * @file
 * Creates a source domain for linking to content from other domains.
 *
 * @ingroup domain_source
 */

define('DOMAIN_SOURCE_USE_ACTIVE', -5);
define('DOMAIN_SOURCE_IGNORE', -10);

/**
 * Implements hook_form_alter()
 */
function domain_source_form_alter(&$form, &$form_state, $form_id) {
  // Apply to all node editing forms only.
  if (empty($form['#node_edit_form'])) {
    return;
  }
  global $user;
  $_domain = domain_get_domain();
  if (!empty($form['#node']->nid)) {
    $default_source = db_query("SELECT domain_id FROM {domain_source} WHERE nid = :nid", array(':nid' => $form['#node']->nid))->fetchField();
  }
  if (!isset($default_source)) {
    $default_source = $_domain['domain_id'];
  }
  // Prevent invalid domains from being used.
  $lookup = domain_lookup($default_source);
  if ($default_source != DOMAIN_SOURCE_USE_ACTIVE && empty($lookup['valid'])) {
    $default_source = NULL;
  }
  $account = $user;
  domain_get_user_domains($account);
  // Only uses with 'set domain access' can assign content to all affilaites, so they get a new option.
  // This option allows domain source to be ignored on a per-node basis.
  $options = array();
  $domains = domain_domains();
  $show = FALSE;
  if (user_access('set domain access')) {
    $show = TRUE;
    $options[DOMAIN_SOURCE_USE_ACTIVE] = t('Use active domain');
    foreach ($domains as $domain) {
      if ($domain['valid'] || user_access('access inactive domains')) {
        $options[$domain['domain_id']] = $domain['sitename'];
      }
    }
  }
  // In the case of users with limited permissions, option 3 is the "show options" value.
  elseif (user_access('publish to any assigned domain') && !empty($account->domain_user)) {
    $show = FALSE;
    $options[DOMAIN_SOURCE_USE_ACTIVE] = t('Use active domain');
    // Get the user's allowed domains.
    foreach ($domains as $domain) {
      $key = $domain['domain_id'];
      if (!empty($user->domain_user[$key]) && ($domain['valid'] || user_access('access inactive domains'))) {
        $options[$key] = $domain['sitename'];
      }
    }
    // Is this node assigned to a source that the user can control?
    if (isset($form['#node']->domain_source)) {
      $source = $form['#node']->domain_source;
    }
    else {
      $source = NULL;
      $show = TRUE;
    }
    if (!is_null($source) && isset($account->domain_user[$source])) {
      if ($account->domain_user[$source] == $source) {
        $show = TRUE;
      }
      else {
        $name = ($source != -5) ? $domains[$source]['sitename'] : t('the active domain');
        $form['domain']['domain_source_notes'] = array(
          '#type' => 'item',
          '#title' => t('Source domain'),
          '#markup' => t('This content is assigned to %domain and cannot be reassigned.', array('%domain' => $name)),
        );
      }
    }
  }
  // Determine how to show the form element.
  if ($show) {
    $form['domain']['domain_source'] = array(
      '#type' => 'select',
      '#title' => t('Source domain'),
      '#options' => $options,
      '#default_value' => $default_source,
      '#description' => t('This affiliate will be used to write links to this content from other affiliates, as needed.')
    );
  }
  // Non-privileged users just have the current domain assigned.
  else {
    $form['domain']['domain_source'] = array(
      '#type' => 'value',
      '#value' => $default_source,
    );
  }
}

/**
 * Integrate with Domain Content.
 */
function domain_source_form_domain_content_admin_alter(&$form, &$form_state) {
  $_domain = domain_get_domain();
  if (!user_access('set domain access')) {
    return;
  }
  $options = array();
  $domains = domain_domains();
  // Options.
  $options[DOMAIN_SOURCE_IGNORE] = t('Do not change');
  $options[DOMAIN_SOURCE_USE_ACTIVE] = t('Use active domain');
  foreach ($domains as $domain) {
    $options[$domain['domain_id']] = $domain['sitename'];
  }
  $form['domain']['domain_source'] = array(
    '#type' => 'select',
    '#title' => t('Source domain'),
    '#options' => $options,
    '#default_value' => $_domain['domain_id'],
    '#description' => t('The canonical domain for the selected content. This element replaces existing settings for all selections.')
  );
  $form['admin']['options']['submit']['#validate'][] = 'domain_source_validate';
  $form['admin']['options']['submit']['#submit'][] = 'domain_source_update_nodes';
}

/**
 * Form integration with Administer nodes.
 */
function domain_source_form_node_admin_content_alter(&$form, &$form_state) {
  // Do nothing on the delete screen.
  if (isset($form['operation']['#value']) && $form['operation']['#value'] == 'delete') {
    return;
  }
  domain_source_form_domain_content_admin_alter($form, $form_state);
}

/**
 * Implements hook_node_validate().
 */
function domain_source_node_validate($node, $form) {
  // If not set, we ignore.
  if (!isset($node->domain_source)) {
    return;
  }
  $key = $node->domain_source;
  $default = domain_default_id();
  // Check the domain and domains_raw variables to set up the allowed source list.
  $allowed = array();
  if (!empty($node->domains)) {
    $allowed = $node->domains;
  }
  if (!empty($node->domains_raw)) {
    $allowed = array_merge($allowed, $node->domains_raw);
  }
  if ($node->domain_site && $key == $default) {
    // This case is acceptable, so we let it pass.
    // I find this code easier to read than a compound IF statement.
  }
  // Here we account for both the 'domains_raw' and 'domains' options.
  elseif ($node->domain_source != DOMAIN_SOURCE_USE_ACTIVE && !in_array($key, $allowed)) {
    form_set_error('domain_source', t('The source affiliate must be selected as a publishing option.'));
  }
}

/**
 * Implements hook_node_load().
 */
function domain_source_node_load($nodes, $types) {
  $source = domain_source_lookup($nodes);
  foreach ($nodes as $node) {
    // Cannot load if the node has not been created yet.
    if (!isset($node->nid)) {
      continue;
    }
    $nodes[$node->nid]->domain_source = $source[$node->nid]['domain_id'];
  }
}

/**
 * Implements hook_node_insert()
 */
function domain_source_node_insert($node) {
  // If not set, we ignore.
  if (!isset($node->domain_source) || is_null($node->domain_source)) {
    return;
  }
  domain_source_node_delete($node);
  db_insert('domain_source')
    ->fields(array(
      'nid' => $node->nid,
      'domain_id' => $node->domain_source,
    ))
    ->execute();
  // Clear the cache.
  domain_source_lookup($node->nid, array(), NULL, TRUE);
}

/**
 * Implements hook_node_update()
 */
function domain_source_node_update($node) {
  domain_source_node_insert($node);
}

/**
 * Implements hook_node_delete()
 */
function domain_source_node_delete($node) {
  db_delete('domain_source')
    ->condition('nid', $node->nid)
    ->execute();
}

/**
 * Implements hook_node_view()
 *
 * Display debugging information for a node.
 */
function domain_source_node_view($node, $view_mode) {
  if (empty($node->nid) || !in_array($view_mode, array('full', 'teaser'))) {
    return;
  }
  if (variable_get('domain_debug', 0) && user_access('set domain access') && isset($node->domain_source)) {
    $source = domain_get_node_match($node->nid);
    $extra = ' ';
    $use_active = db_query("SELECT domain_id FROM {domain_source} WHERE nid = :nid", array(':nid' => $node->nid))->fetchField();
    if ($use_active === FALSE) {
      $extra .= t('(determined automatically)');
    }
    elseif ($use_active == DOMAIN_SOURCE_USE_ACTIVE) {
      $extra .= t('(using active domain)');
    }
    if (!isset($node->content['domain']['#markup'])) {
      $node->content['domain']['#markup'] = '';
    }
    $node->content['domain']['#markup'] .= '<p>' . t('<strong>Source domain</strong>: %source', array('%source' => $source['sitename'])) . $extra . '</p>';
  }
}

/**
 * Get the source domains for multiple matches, mimicking node_load().
 *
 * @param $nodes
 *   An array of nodes, keyed by node id, or a single node id.
 * @param $domains
 *   An optional array of domain ids; can only be used for a single node.
 * @param $domain_site
 *   Optional flag indicating that the node is assigned to all domains.
 * @param $reset
 *   Force a reset of the static data lookup.
 * @return
 *   An associative array of data, keyed by node id, or a single array.
 *   The data array is the active source domain to use, as returned by domain_lookup().
 */
function domain_source_lookup($nodes, $domains = array(), $domain_site = FALSE, $reset = FALSE) {
  global $_domain;
  static $lookups;
  // Reset?
  if ($reset) {
    $lookups = array();
  }
  // Ensure we format the lookup correctly.
  if (!is_array($nodes)) {
    $nid = $nodes;
    $node_ids = array($nid);
    $array = FALSE;
  }
  else {
    $node_ids = array_keys($nodes);
    $array = TRUE;
  }
  // Static cache.
  if (!$reset && isset($nid) && isset($lookups[$nid])) {
    return $lookups[$nid];
  }

  $result = db_query("SELECT nid, domain_id FROM {domain_source} WHERE nid IN (:nid)", array(':nid' => $node_ids))->fetchAll();

  foreach ($result as $data) {
    $source = $data->domain_id;

    // DOMAIN_SOURCE_USE_ACTIVE is the status for 'Use active domain.'
    if ($source == DOMAIN_SOURCE_USE_ACTIVE) {
      $source = $_domain['domain_id'];
    }
    // When called from url_rewrite_outbound(), we have no data.
    if (empty($domains)) {
      $lookup = domain_get_node_domains($data->nid);
      $domain_site = $lookup['domain_site'];
      $domains = $lookup['domain_id'];
    }
    // If no valid source is found, take the first match from the $domains array.
    if (empty($domain_site) && !empty($domains) && !in_array($source, $domains)) {
      $source = current($domains);
    }
    // Lookup the source domain.
    $lookups[$data->nid] = domain_lookup($source);
  }
  // Make sure we found something for every requested node.
  $no_records = $node_ids;
  if (!empty($lookups)) {
    $no_records = array_diff($node_ids, array_keys($lookups));
  }
  foreach ($no_records as $nid) {
    $default_source = variable_get('domain_default_source', 0);
    // Global setting for 'do not change domain.'
    if ($default_source == -1) {
      $lookups[$nid] = $_domain;
    }
    else {
      $lookups[$nid] = domain_lookup($default_source);
    }
  }
  if ($array) {
    return $lookups;
  }
  return $lookups[$nid];
}

/**
 * FormAPI function that lets us update access rules.
 */
function domain_source_update_nodes($form, &$form_state) {
  // If our operation is flagged, then we have to manually change the
  // {node_access} table.  The rest of the process will clear the cache,
  // so this should be a safe operation.
  if ($form_state['values']['operation'] == 'domain') {
    $source = $form_state['values']['domain_source'];
    foreach ($form_state['values']['nodes'] as $key => $value) {
      if ($key == $value) {
        db_delete('domain_source')
          ->condition('nid', $key)
          ->execute();
        db_insert('domain_source')
          ->fields(array(
            'nid' => $key,
            'domain_id' => $source,
          ))
          ->execute();
      }
    }
  }
}

/**
 * Form validation step
 */
function domain_source_validate($form, &$form_state) {
  if ($form_state['values']['operation'] == 'domain') {
    $default = domain_default_id();
    $key = $form_state['values']['domain_source'];
    if ($form_state['values']['domain_site'] && $key == $default || $key == DOMAIN_SOURCE_USE_ACTIVE) {
      // These cases are acceptable, so we let them pass.
      // I find this code easier to read than a compound negative IF statement.
    }
    elseif ($key == DOMAIN_SOURCE_IGNORE) {
      // In this case, we need to check all the selected nodes, which is resource intensive.
      $nodes = array_filter($form_state['values']['nodes']);
      foreach ($nodes as $nid) {
        $source = domain_source_lookup($nid, array(), $form_state['values']['domain_site'], TRUE);
        $key = $source['domain_id'];
        // Test for the first two behaviors, which add domains to the node.
        $behavior = $form_state['values']['behavior'];
        if ($behavior < 2) {
          if (empty($form_state['values']['domains'][$key])) {
            $node = node_load($nid);
            form_set_error('domain_source', t('The source affiliate must be selected as a publishing option. %title is assigned to %domain.', array('%title' => $node->title, '%domain' => $source['sitename'])));
          }
        }
        // Do not allow removal of the source domain when removing domains from the node.
        elseif (!empty($form_state['values']['domains'][$key])) {
          $node = node_load($nid);
          form_set_error('domain_source', t('The source affiliate must be selected as a publishing option. %title is assigned to %domain.', array('%title' => $node->title, '%domain' => $source['sitename'])));
        }
      }
    }
    // The source domain must have been selected.
    elseif (empty($form_state['values']['domains'][$key])) {
      form_set_error('domain_source', t('The source affiliate must be selected as a publishing option.'));
    }
  }
}

/**
 * Implements hook_views_api().
 */
function domain_source_views_api() {
  if (module_exists('domain_views')) {
    return array('api' => 2.0);
  }
}