<?php
/*
 * Suggest words to search
 */
require_once dirname(__FILE__) . '/../inc/global.inc.php';

function get_suggestions_from_search_engine($q) {
    if (strlen($q)<2) { return null;}
    global $charset;
	$table_sfv     = Database :: get_main_table(TABLE_MAIN_SPECIFIC_FIELD_VALUES);
	$q = Database::escape_string($q);
    $cid = api_get_course_id();
    $sql_add = '';
    if ($cid != -1) {
    	$sql_add = " AND course_code = '".$cid."' ";
    }
	$sql = "SELECT * FROM $table_sfv where value LIKE '%$q%'".$sql_add." ORDER BY course_code, tool_id, ref_id, field_id";
	$sql_result = api_sql_query($sql,__FILE__,__LINE__);
	$data = array();
    $i = 0;
    while ($row = Database::fetch_array($sql_result)) {
        echo mb_convert_encoding($row['value'],'UTF-8',$charset)."| value\n";
        if ($i<20) {
            $data[ $row['course_code'] ] [ $row['tool_id'] ] [ $row['ref_id'] ] = 1;
        }
        $i++;
    }
    // now that we have all the values corresponding to this search, we want to
    // make sure we get all the associated values that could match this one
    // initial value...
    $more_sugg = array();
    foreach ($data as $cc => $course_id) {
    	foreach ($course_id as $ti => $item_tool_id) {
    		foreach ($item_tool_id as $ri => $item_ref_id) {
    			//natsort($item_ref_id);
                $output = array();
                $field_val = array();
                $sql2 = "SELECT * FROM $table_sfv where course_code = '$cc' AND tool_id = '$ti' AND ref_id = '$ri' ORDER BY field_id";
                $res2 = api_sql_query($sql2,__FILE__,__LINE__);
                // TODO this code doesn't manage multiple terms in one same field just yet (should duplicate results in this case) 
                $field_id = 0;
                while ($row2 = Database::fetch_array($res2)) {
                    //TODO : this code is not perfect yet. It overrides the
                    // first match set, so having 1:Yannick,Julio;2:Rectum;3:LASER
                    // will actually never return: Yannick - Rectum - LASER
                    // because it is overwriteen by Julio - Rectum - LASER
                    // We should have recursivity here to avoid this problem!
                    //Store the new set of results (only one per combination
                    // of all fields)
                    $field_val[$row2['field_id']] = $row2['value'];
                    $current_field_val = '';
                    foreach ($field_val as $id => $val) {
                    	$current_field_val .= $val.' - ';
                    }
                    //Check whether we have a field repetition or not. Results
                    // have been ordered by field_id, so we should catch them
                    // all here
                    if ($field_id == $row2['field_id']) {
                    	//We found the same field id twice, split the output
                        // array to allow for two sets of results (copy all
                        // existing array elements into copies and update the
                        // copies) eg. Yannick - Car - Driving in $output[1] 
                        // will create a copy as Yannick - Car - Speed 
                        // in $output[3]
                        $c = count($output);
                        for ($i=0;$i<$c; $i++) {
                        	$output[($c+$i)] = $current_field_val;
                        }
                    } else {
                        //no identical field id, continue as usual
                        $c = count($output);
                        if ($c == 0) {
                            $output[] = $row2['value'].' - ';
                        } else {
                            foreach ($output as $i=>$out) {
                                //use the latest combination of fields
                                $output[$i] .= $row2['value'].' - ';
                            }
                        }
                        $field_id = $row2['field_id'];
                    }
                }
                foreach ($output as $i=>$out) {
                    if (stristr($out,$q) === false) {continue;}
                    $s = mb_convert_encoding(substr($out,0,-3),'UTF-8',$charset) . "| value\n";
                    if (!in_array($s,$more_sugg)) {
        			    $more_sugg[] = $s;
                    }
                }
    		}
    	}
    }
    foreach ($more_sugg as $sugg) {
        echo $sugg;
    }
}

$q = strtolower($_GET["q"]);
if (!$q) return;
//echo $q . "| value\n";
get_suggestions_from_search_engine($q);
?>