<?
//NumTorrents is actually the number of things in the collage, the name just isn't generic.

authorize();

include(SERVER_ROOT.'/classes/validate.class.php');
$Val = new VALIDATE;

function add_artist($CollageID, $ArtistID) {
	global $Cache, $LoggedUser, $DB;

	$DB->query("
		SELECT MAX(Sort)
		FROM collages_artists
		WHERE CollageID = '$CollageID'");
	list($Sort) = $DB->next_record();
	$Sort += 10;

	$DB->query("
		SELECT ArtistID
		FROM collages_artists
		WHERE CollageID = '$CollageID'
			AND ArtistID = '$ArtistID'");
	if (!$DB->has_results()) {
		$DB->query("
			INSERT IGNORE INTO collages_artists
				(CollageID, ArtistID, UserID, Sort, AddedOn)
			VALUES
				('$CollageID', '$ArtistID', '$LoggedUser[ID]', '$Sort', '" . sqltime() . "')");

		$DB->query("
			UPDATE collages
			SET NumTorrents = NumTorrents + 1, Updated = '" . sqltime() . "'
			WHERE ID = '$CollageID'");

		$Cache->delete_value("collage_$CollageID");
		$Cache->delete_value("artists_collages_$ArtistID");
		$Cache->delete_value("artists_collages_personal_$ArtistID");

		$DB->query("
			SELECT UserID
			FROM users_collage_subs
			WHERE CollageID = $CollageID");
		while (list($CacheUserID) = $DB->next_record()) {
			$Cache->delete_value("collage_subs_user_new_$CacheUserID");
		}
	}
}

$CollageID = $_POST['collageid'];
if (!is_number($CollageID)) {
	error(404);
}
$DB->query("
	SELECT UserID, CategoryID, Locked, NumTorrents, MaxGroups, MaxGroupsPerUser
	FROM collages
	WHERE ID = '$CollageID'");
list($UserID, $CategoryID, $Locked, $NumTorrents, $MaxGroups, $MaxGroupsPerUser) = $DB->next_record();

if (!check_perms('site_collages_delete')) {
	if ($Locked) {
		$Err = 'This collage is locked';
	}
	if ($CategoryID == 0 && $UserID != $LoggedUser['ID']) {
		$Err = 'You cannot edit someone else\'s personal collage.';
	}
	if ($MaxGroups > 0 && $NumTorrents >= $MaxGroups) {
		$Err = 'This collage already holds its maximum allowed number of artists.';
	}

	if (isset($Err)) {
		error($Err);
	}
}

if ($MaxGroupsPerUser > 0) {
	$DB->query("
		SELECT COUNT(*)
		FROM collages_artists
		WHERE CollageID = '$CollageID'
			AND UserID = '$LoggedUser[ID]'");
	list($GroupsForUser) = $DB->next_record();
	if (!check_perms('site_collages_delete') && $GroupsForUser >= $MaxGroupsPerUser) {
		error(403);
	}
}

if ($_REQUEST['action'] == 'add_artist') {
	$Val->SetFields('url', '1', 'regex', 'The URL must be a link to a artist on the site.', array('regex' => '/^'.ARTIST_REGEX.'/i'));
	$Err = $Val->ValidateForm($_POST);

	if ($Err) {
		error($Err);
	}

	$URL = $_POST['url'];

	// Get artist ID
	preg_match('/^'.ARTIST_REGEX.'/i', $URL, $Matches);
	$ArtistID = $Matches[4];
	if (!$ArtistID || (int) $ArtistID == 0) {
		error(404);
	}

	$DB->query("
		SELECT ArtistID
		FROM artists_group
		WHERE ArtistID = '$ArtistID'");
	list($ArtistID) = $DB->next_record();
	if (!$ArtistID) {
		error('The artist was not found in the database.');
	}

	add_artist($CollageID, $ArtistID);
} else {
	$URLs = explode("\n", $_REQUEST['urls']);
	$ArtistIDs = array();
	$Err = '';
	foreach ($URLs as $Key => &$URL) {
		$URL = trim($URL);
		if ($URL == '') {
			unset($URLs[$Key]);
		}
	}
	unset($URL);

	if (!check_perms('site_collages_delete')) {
		if ($MaxGroups > 0 && ($NumTorrents + count($URLs) > $MaxGroups)) {
			$Err = "This collage can only hold $MaxGroups artists.";
		}
		if ($MaxGroupsPerUser > 0 && ($GroupsForUser + count($URLs) > $MaxGroupsPerUser)) {
			$Err = "You may only have $MaxGroupsPerUser artists in this collage.";
		}
	}

	foreach ($URLs as $URL) {
		$Matches = array();
		if (preg_match('/^'.ARTIST_REGEX.'/i', $URL, $Matches)) {
			$ArtistIDs[] = $Matches[4];
			$ArtistID = $Matches[4];
		} else {
			$Err = "One of the entered URLs ($URL) does not correspond to an artist on the site.";
			break;
		}

		$DB->query("
			SELECT ArtistID
			FROM artists_group
			WHERE ArtistID = '$ArtistID'");
		if (!$DB->has_results()) {
			$Err = "One of the entered URLs ($URL) does not correspond to an artist on the site.";
			break;
		}
	}

	if ($Err) {
		error($Err);
	}

	foreach ($ArtistIDs as $ArtistID) {
		add_artist($CollageID, $ArtistID);
	}
}
header('Location: collages.php?id='.$CollageID);