<?
authorize();

$UserID = $LoggedUser['ID'];
$Artist1ID = db_string($_POST['artistid']);
$Artist2Name = db_string($_POST['artistname']);

if (!is_number($Artist1ID)) {
	error(0);
}

if (empty($Artist2Name)) {
	error('Blank artist name.');
}

$DB->query("SELECT ag.ArtistID FROM artists_group AS ag WHERE ag.Name LIKE '$Artist2Name'");
list($Artist2ID) = $DB->next_record();

if (!empty($Artist2ID)) { // artist was found in the database

	// Let's see if there's already a similar artists field for these two
	$DB->query("SELECT
		s1.SimilarID
		FROM artists_similar AS s1
		JOIN artists_similar AS s2 ON s1.SimilarID=s2.SimilarID
		WHERE s1.ArtistID='$Artist1ID' AND s2.ArtistID='$Artist2ID'");
	list($SimilarID) = $DB->next_record();

	if ($SimilarID) { // The similar artists field already exists, just update the score
		$DB->query("UPDATE artists_similar_scores SET Score=Score+200 WHERE SimilarID='$SimilarID'");
	} else { // No, it doesn't exist - create it
		$DB->query("INSERT INTO artists_similar_scores (Score) VALUES ('200')");
		$SimilarID = $DB->inserted_id();
		$DB->query("INSERT INTO artists_similar (ArtistID, SimilarID) VALUES ('$Artist1ID', '$SimilarID')");
		$DB->query("INSERT INTO artists_similar (ArtistID, SimilarID) VALUES ('$Artist2ID', '$SimilarID')");
	}

	$DB->query("SELECT SimilarID FROM artists_similar_votes WHERE SimilarID='$SimilarID' AND UserID='$UserID' AND Way='up'");
	if (!$DB->has_results()) {
		$DB->query("INSERT INTO artists_similar_votes (SimilarID, UserID, way) VALUES ('$SimilarID', '$UserID', 'up')");
	}

	$Cache->delete_value('artist_'.$Artist1ID); // Delete artist cache
	$Cache->delete_value('artist_'.$Artist2ID); // Delete artist cache
	$Cache->delete_value('similar_positions_'.$Artist1ID); // Delete artist's similar map cache
	$Cache->delete_value('similar_positions_'.$Artist2ID); // Delete artist's similar map cache
}


header('Location: '.$_SERVER['HTTP_REFERER']);
?>