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<?php
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// $Id:$
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if (module_exist('views')) {
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include_once('node_recommendation_views.inc');
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}
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function node_recommedation_help($section) {
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switch ($section) {
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case 'admin/modules#description':
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return t("Provides blocks and an api to display Recommended Nodes");
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case 'admin/settings/cre':
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return t("Provides several different ways to display Recommended Nodes to users");
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}
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}
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/*
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* implementation of hook_block()
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*/
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function node_recommedation_block($op = 'list', $delta = 0, $edit = array()) {
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// LOCAL VARIABLES!! FIX THIS TO THE ACTUAL USER AND n
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global $user;
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$uid = $user->uid;
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$name = $user->name;
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// The $op parameter determines what piece of information is being requested.
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switch ($op) {
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case 'list':
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// If $op is "list", we just need to return a list of block descriptions.
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// This is used to provide a list of possible blocks to the administrator,
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// end users will not see these descriptions.
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$blocks[0]['info'] = t('General node Recomendation Engine block');
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$blocks[1]['info']= t('Similarly Rated Nodes');
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return $blocks;
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case 'configure':
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// If $op is "configure", we need to provide the administrator with a
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// configuration form. The $delta parameter tells us which block is being
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// configured. In this example, we'll allow the administrator to customize
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// the text of the first block.
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$form = array();
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if ($delta == 0) {
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// All we need to provide is a text field, Drupal will take care of
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// the other block configuration options and the save button.
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$form['node_recommedation_general_title'] = array(
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'#type' => 'textfield',
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'#title' => t('Title'),
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'#size' => 20,
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'#description' => t('This string will the title of the General Recommendation Block'),
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'#default_value' =>
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variable_get('node_recommedation_general_title', t('Recommended Nodes')),
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);
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// now add the value for n
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$form['n_value'] = array(
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'#type' => 'textfield',
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'#title' => t('Maximum number of nodes to recommend'),
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'#size' => 2,
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'#description' => t('This sets the max number of recommended nodes presented within the general block'),
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'#default_value' => 2,
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);
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}
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else if ($delta == 1)
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{
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$form['node_recommedation_similar_title'] = array(
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'#type' => 'textfield',
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'#title' => t('Title for the similar rated block'),
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'#size' => 20,
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'#description' => t('This sets the title for this block'),
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'#default_value' => variable_get('node_recommedation_similar_title', t('Similarly Rated Nodes')),
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);
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// n_value for this block
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$form['node_recommedation_similar_n_value'] = array(
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'#type' => 'textfield',
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'#title' => t('Maximum number of nodes to recommend'),
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'#size' => 2,
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'#description' => t('This sets the max number of nodes to recommend'),
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'#default_value' => variable_get('node_recommedation_similar_n_value', 4),
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);
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}
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return $form;
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case 'save':
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// If $op is "save", we need to save settings from the configuration form.
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// Since the first block is the only one that allows configuration, we
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// need to check $delta to make sure we only save it.
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if ($delta == 0) {
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// Have Drupal save the string to the database.
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variable_set('node_recommedation_general_title', $edit['node_recommedation_general_title']);
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variable_set('cre_n_value', $edit['n_value']);
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}
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else if ($delta == 1)
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{
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variable_set('node_recommedation_similar_title', $edit['node_recommedation_similar_title']);
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variable_set('node_recommedation_similar_n_value', $edit['node_recommedation_similar_n_value']);
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}
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return;
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case 'view': default:
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// If $op is "view", then we need to generate the block for display
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// purposes. The $delta parameter tells us which block is being requested.
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switch ($delta) {
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case 0:
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//Personalized recommendations
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$n=variable_get('cre_n_value',1);
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$block['subject'] = t(variable_get('node_recommedation_general_title', t('Recommended Nodes')));
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$block['content'] = node_recommedation_get_top_n($uid, $n);
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break;
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case 1: // call for the general similar block
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$n = variable_get('node_recommedation_similar_n_value', 3);
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$block['subject'] = t(variable_get('node_recommedation_similar_title', t('Those that like this also liked')));
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$block['content'] = t(node_recommedation_get_similar($n));
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break;
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}
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return $block;
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}
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}
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/*
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* implementation of node's hook_nodeapi()
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*/
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function node_recommedation_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL)
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{
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if($op == 'delete') {
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// remove all references in cre_avg_node_diff table where both $nid1 == &$node->nid and $nid2 == &$node->nid
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db_query("DELETE FROM {cre_similarity_matrix} WHERE nid1=%d OR nid2=%d",$node->nid,$node->nid);
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}
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}
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/*
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* Formats and prints the top n nodes
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*
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* @param $uid
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* uid for the personalized recommendations
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*
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* @param $n
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* specifies the number of recommendations to return
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*/
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function node_recommedation_get_top_n($uid,$n) {
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// do something special if user not logged in????
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if($uid == 0) {
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return;
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}
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//fetch nids
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$recommedations = cre_top($uid, $n, 'node','vote');
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if ($recommedations == NULL) {
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return;
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}
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foreach($recommedations as $nodeobj) {
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// format and return the html
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$node = db_fetch_object(db_query("SELECT title, nid FROM {node} WHERE nid=%d",$nodeobj->content_id));
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$return_value.= l($node->title,"node/".$node->nid) /*." score = ".$nodeobj->score*/ ."<br>";
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}
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return $return_value;
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}
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/*
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* formats the nodes that were rated similar according to the currently
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* viewed node
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*
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* @param $n
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* Specifies the number of recommendatios to print
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*/
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function node_recommedation_get_similar($n) {
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if (arg(0) == 'node') {
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$nid = arg(1);
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if($nid <= 0) {
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// May want to do something here if it's not a node
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// highest rated nodes?
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return;
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}
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}
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else {
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return;
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}
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// now get the similar nodes
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$related_nodes = cre_similar($n,$nid,'node','vote');
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if ($related_nodes == NULL) {
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// no one has rated this node yet
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// therefore, there are no 'similars'
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// optionally display some msg (Be the first to rate this node something like that )
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return;
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}
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foreach($related_nodes as $recommended) {
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// format the output html
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$node = db_fetch_object(db_query("SELECT title, nid FROM {node} WHERE nid=%d",$recommended->content_id));
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$return_value .= l($node->title, "node/".$node->nid) . "<br>";
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}
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return $return_value;
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}
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