<?php
class BookmarkService {
    var $db;

    function & getInstance(& $db) {
        static $instance;
        if (!isset ($instance))
            $instance = & new BookmarkService($db);
        return $instance;
    }

    function BookmarkService(& $db) {
        $this->db = & $db;
    }

    function _getbookmark($fieldname, $value, $all = false) {
        if (!$all) {
            $userservice = & ServiceFactory :: getServiceInstance('UserService');
            $sId = $userservice->getCurrentUserId();
            $range = ' AND uId = '. $sId;
        }

        $query = 'SELECT * FROM '. $GLOBALS['tableprefix'] .'bookmarks WHERE '. $fieldname .' = "'. $this->db->sql_escape($value) .'"'. $range;

        if (!($dbresult = & $this->db->sql_query_limit($query, 1, 0))) {
            message_die(GENERAL_ERROR, 'Could not get bookmark', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        if ($row =& $this->db->sql_fetchrow($dbresult)) {
            return $row;
        } else {
            return false;
        }
    }

    function & getBookmark($bid, $include_tags = false) {
        if (!is_numeric($bid))
            return;

        $sql = 'SELECT * FROM '. $GLOBALS['tableprefix'] .'bookmarks WHERE bId = '. $this->db->sql_escape($bid);

        if (!($dbresult = & $this->db->sql_query($sql)))
            message_die(GENERAL_ERROR, 'Could not get vars', '', __LINE__, __FILE__, $sql, $this->db);

        if ($row = & $this->db->sql_fetchrow($dbresult)) {
            if ($include_tags) {
                $tagservice = & ServiceFactory :: getServiceInstance('TagService');
                $row['tags'] = $tagservice->getTagsForBookmark($bid);
            }
            return $row;
        } else {
            return false;
        }
    }

    function getBookmarkByAddress($address) {
        $hash = md5($address);
        return $this->getBookmarkByHash($hash);
    }

    function getBookmarkByHash($hash) {
        return $this->_getbookmark('bHash', $hash, true);
    }

    function editAllowed($bookmark) {
        if (!is_numeric($bookmark) && (!is_array($bookmark) || !is_numeric($bookmark['bId'])))
            return false;

        if (!is_array($bookmark))
            if (!($bookmark = $this->getBookmark($bookmark)))
                return false;

        $userservice = & ServiceFactory :: getServiceInstance('UserService');
        $userid = $userservice->getCurrentUserId();
        if ($userservice->isAdmin($userid))
            return true;
        else
            return ($bookmark['uId'] == $userid);
    }

    function bookmarkExists($address = false, $uid = NULL) {
        if (!$address) {
            return;
        }

        // If address doesn't contain ":", add "http://" as the default protocol
        if (strpos($address, ':') === false) {
            $address = 'http://'. $address;
        }

        $crit = array ('bHash' => md5($address));
        if (isset ($uid)) {
            $crit['uId'] = $uid;
        }

        $sql = 'SELECT COUNT(*) FROM '. $GLOBALS['tableprefix'] .'bookmarks WHERE '. $this->db->sql_build_array('SELECT', $crit);
        if (!($dbresult = & $this->db->sql_query($sql))) {
            message_die(GENERAL_ERROR, 'Could not get vars', '', __LINE__, __FILE__, $sql, $this->db);
        }
        return ($this->db->sql_fetchfield(0, 0) > 0);
    }

    // Adds a bookmark to the database.
    // Note that date is expected to be a string that's interpretable by strtotime().
    function addBookmark($address, $title, $description, $status, $categories, $date = NULL, $fromApi = false, $fromImport = false) {
        $userservice = & ServiceFactory :: getServiceInstance('UserService');
        $sId = $userservice->getCurrentUserId();

        // If bookmark address doesn't contain ":", add "http://" to the start as a default protocol
        if (strpos($address, ':') === false) {
            $address = 'http://'. $address;
        }

        // Get the client's IP address and the date; note that the date is in GMT.
        if (getenv('HTTP_CLIENT_IP'))
            $ip = getenv('HTTP_CLIENT_IP');
        else
            if (getenv('REMOTE_ADDR'))
                $ip = getenv('REMOTE_ADDR');
            else
                $ip = getenv('HTTP_X_FORWARDED_FOR');

        // Note that if date is NULL, then it's added with a date and time of now, and if it's present,
        // it's expected to be a string that's interpretable by strtotime().
        if (is_null($date))
            $time = time();
        else
            $time = strtotime($date);
        $datetime = gmdate('Y-m-d H:i:s', $time);

        // Set up the SQL insert statement and execute it.
        $values = array('uId' => intval($sId), 'bIp' => $ip, 'bDatetime' => $datetime, 'bModified' => $datetime, 'bTitle' => $title, 'bAddress' => $address, 'bDescription' => $description, 'bStatus' => intval($status), 'bHash' => md5($address));
        $sql = 'INSERT INTO '. $GLOBALS['tableprefix'] .'bookmarks '. $this->db->sql_build_array('INSERT', $values);
        $this->db->sql_transaction('begin');
        if (!($dbresult = & $this->db->sql_query($sql))) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not insert bookmark', '', __LINE__, __FILE__, $sql, $this->db);
            return false;
        }
        // Get the resultant row ID for the bookmark.
        $bId = $this->db->sql_nextid($dbresult);
        if (!isset($bId) || !is_int($bId)) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not insert bookmark', '', __LINE__, __FILE__, $sql, $this->db);
            return false;
        }

        $uriparts = explode('.', $address);
        $extension = end($uriparts);
        unset($uriparts);

        $tagservice = & ServiceFactory :: getServiceInstance('TagService');
        if (!$tagservice->attachTags($bId, $categories, $fromApi, $extension, false, $fromImport)) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not insert bookmark', '', __LINE__, __FILE__, $sql, $this->db);
            return false;
        }
        $this->db->sql_transaction('commit');
        // Everything worked out, so return the new bookmark's bId.
        return $bId;
    }

    function updateBookmark($bId, $address, $title, $description, $status, $categories, $date = NULL, $fromApi = false) {
        if (!is_numeric($bId))
            return false;

        // Get the client's IP address and the date; note that the date is in GMT.
        if (getenv('HTTP_CLIENT_IP'))
            $ip = getenv('HTTP_CLIENT_IP');
        else
            if (getenv('REMOTE_ADDR'))
                $ip = getenv('REMOTE_ADDR');
            else
                $ip = getenv('HTTP_X_FORWARDED_FOR');

        $moddatetime = gmdate('Y-m-d H:i:s', time());

        // Set up the SQL update statement and execute it.
        $updates = array('bModified' => $moddatetime, 'bTitle' => $title, 'bAddress' => $address, 'bDescription' => $description, 'bStatus' => $status, 'bHash' => md5($address));

        if (!is_null($date)) {
            $updates['bDateTime'] = gmdate('Y-m-d H:i:s', strtotime($date));
        }

        $sql = 'UPDATE '. $GLOBALS['tableprefix'] .'bookmarks SET '. $this->db->sql_build_array('UPDATE', $updates) .' WHERE bId = '. intval($bId);
        $this->db->sql_transaction('begin');

        if (!($dbresult = & $this->db->sql_query($sql))) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not update bookmark', '', __LINE__, __FILE__, $sql, $this->db);
            return false;
        }

        $uriparts = explode('.', $address);
        $extension = end($uriparts);
        unset($uriparts);

        $tagservice = & ServiceFactory :: getServiceInstance('TagService');
        if (!$tagservice->attachTags($bId, $categories, $fromApi, $extension)) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not update bookmark', '', __LINE__, __FILE__, $sql, $this->db);
            return false;
        }

        $this->db->sql_transaction('commit');
        // Everything worked out, so return true.
        return true;
    }

    function & getBookmarks($start = 0, $perpage = NULL, $user = NULL, $tags = NULL, $terms = NULL, $sortOrder = NULL, $watched = NULL, $startdate = NULL, $enddate = NULL, $hash = NULL) {
        // Only get the bookmarks that are visible to the current user.  Our rules:
        //  - if the $user is NULL, that means get bookmarks from ALL users, so we need to make
        //    sure to check the logged-in user's watchlist and get the contacts-only bookmarks from
        //    those users. If the user isn't logged-in, just get the public bookmarks.
        //  - if the $user is set and isn't the logged-in user, then get that user's bookmarks, and
        //    if that user is on the logged-in user's watchlist, get the public AND contacts-only
        //    bookmarks; otherwise, just get the public bookmarks.
        //  - if the $user is set and IS the logged-in user, then get all bookmarks.
        $userservice =& ServiceFactory::getServiceInstance('UserService');
        $tagservice =& ServiceFactory::getServiceInstance('TagService');
        $sId = $userservice->getCurrentUserId();

        if ($userservice->isLoggedOn()) {
            // All public bookmarks, user's own bookmarks and any shared with user
            $privacy = ' AND ((B.bStatus = 0) OR (B.uId = '. $sId .')';
            $watchnames = $userservice->getWatchNames($sId, true);
            foreach($watchnames as $watchuser) {
                $privacy .= ' OR (U.username = "'. $watchuser .'" AND B.bStatus = 1)'; 
            }
            $privacy .= ')';
        } else {
            // Just public bookmarks
            $privacy = ' AND B.bStatus = 0';
        }

        // Set up the tags, if need be.
        if (!is_array($tags) && !is_null($tags)) {
            $tags = explode('+', trim($tags));
        }

        $tagcount = count($tags);
        for ($i = 0; $i < $tagcount; $i ++) {
            $tags[$i] = trim($tags[$i]);
        }

        // Set up the SQL query.
        $query_1 = 'SELECT DISTINCT ';
        if (SQL_LAYER == 'mysql4') {
            $query_1 .= 'SQL_CALC_FOUND_ROWS ';
        }
        $query_1 .= 'B.*, U.'. $userservice->getFieldName('username');

        $query_2 = ' FROM '. $userservice->getTableName() .' AS U, '. $GLOBALS['tableprefix'] .'bookmarks AS B';

        $query_3 = ' WHERE B.uId = U.'. $userservice->getFieldName('primary') . $privacy;
        if (is_null($watched)) {
            if (!is_null($user)) {
                $query_3 .= ' AND B.uId = '. $user;
            }
        } else {
            $arrWatch = $userservice->getWatchlist($user);
            if (count($arrWatch) > 0) {
                foreach($arrWatch as $row) {
                    $query_3_1 .= 'B.uId = '. intval($row) .' OR ';
                }
                $query_3_1 = substr($query_3_1, 0, -3);
            } else {
                $query_3_1 = 'B.uId = -1';
            }
            $query_3 .= ' AND ('. $query_3_1 .') AND B.bStatus IN (0, 1)';
        }

        switch($sortOrder) {
            case 'date_asc':
                $query_5 = ' ORDER BY B.bDatetime ASC ';
                break;
            case 'title_desc':
                $query_5 = ' ORDER BY B.bTitle DESC ';
                break;
            case 'title_asc':
                $query_5 = ' ORDER BY B.bTitle ASC ';
                break;
            case 'url_desc':
                $query_5 = ' ORDER BY B.bAddress DESC ';
                break;
            case 'url_asc':
                $query_5 = ' ORDER BY B.bAddress ASC ';
                break;
            default:
                $query_5 = ' ORDER BY B.bDatetime DESC ';
        }

        // Handle the parts of the query that depend on any tags that are present.
        $query_4 = '';
        for ($i = 0; $i < $tagcount; $i ++) {
            $query_2 .= ', '. $GLOBALS['tableprefix'] .'tags AS T'. $i;
            $query_4 .= ' AND T'. $i .'.tag = "'. $this->db->sql_escape($tags[$i]) .'" AND T'. $i .'.bId = B.bId';
        }

        // Search terms
        if ($terms) {
            // Multiple search terms okay
            $aTerms = explode(' ', $terms);
            $aTerms = array_map('trim', $aTerms);

            // Search terms in tags as well when none given
            if (!count($tags)) {
                $query_2 .= ' LEFT JOIN '. $GLOBALS['tableprefix'] .'tags AS T ON B.bId = T.bId';
                $dotags = true;
            } else {
                $dotags = false;
            }

            $query_4 = '';
            for ($i = 0; $i < count($aTerms); $i++) {
                $query_4 .= ' AND (B.bTitle LIKE "%'. $this->db->sql_escape($aTerms[$i]) .'%"';
                $query_4 .= ' OR B.bDescription LIKE "%'. $this->db->sql_escape($aTerms[$i]) .'%"';
                if ($dotags) {
                    $query_4 .= ' OR T.tag = "'. $this->db->sql_escape($aTerms[$i]) .'"';
                }
                $query_4 .= ')';
            }
        }

        // Start and end dates
        if ($startdate) {
            $query_4 .= ' AND B.bDatetime > "'. $startdate .'"';
        }
        if ($enddate) {
            $query_4 .= ' AND B.bDatetime < "'. $enddate .'"';
        }

        // Hash
        if ($hash) {
            $query_4 .= ' AND B.bHash = "'. $hash .'"';
        }

        $query = $query_1 . $query_2 . $query_3 . $query_4 . $query_5;
        if (!($dbresult = & $this->db->sql_query_limit($query, intval($perpage), intval($start)))) {
            message_die(GENERAL_ERROR, 'Could not get bookmarks', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        if (SQL_LAYER == 'mysql4') {
            $totalquery = 'SELECT FOUND_ROWS() AS total';
        } else {
            $totalquery = 'SELECT COUNT(*) AS total'. $query_2 . $query_3 . $query_4;
        }

        if (!($totalresult = & $this->db->sql_query($totalquery)) || (!($row = & $this->db->sql_fetchrow($totalresult)))) {
            message_die(GENERAL_ERROR, 'Could not get total bookmarks', '', __LINE__, __FILE__, $totalquery, $this->db);
            return false;
        }

        $total = $row['total'];

        $bookmarks = array();
        while ($row = & $this->db->sql_fetchrow($dbresult)) {
            $row['tags'] = $tagservice->getTagsForBookmark(intval($row['bId']));
            $bookmarks[] = $row;
        }
        return array ('bookmarks' => $bookmarks, 'total' => $total);
    }

    function deleteBookmark($bookmarkid) {
        $query = 'DELETE FROM '. $GLOBALS['tableprefix'] .'bookmarks WHERE bId = '. intval($bookmarkid);
        $this->db->sql_transaction('begin');
        if (!($dbresult = & $this->db->sql_query($query))) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not delete bookmarks', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        $query = 'DELETE FROM '. $GLOBALS['tableprefix'] .'tags WHERE bId = '. intval($bookmarkid);
        $this->db->sql_transaction('begin');
        if (!($dbresult = & $this->db->sql_query($query))) {
            $this->db->sql_transaction('rollback');
            message_die(GENERAL_ERROR, 'Could not delete bookmarks', '', __LINE__, __FILE__, $query, $this->db);
            return false;
        }

        $this->db->sql_transaction('commit');
        return true;
    }

    function countOthers($address) {
        if (!$address) {
            return false;
        }

        $userservice = & ServiceFactory :: getServiceInstance('UserService');
        $sId = $userservice->getCurrentUserId();

        if ($userservice->isLoggedOn()) {
            // All public bookmarks, user's own bookmarks and any shared with user
            $privacy = ' AND ((B.bStatus = 0) OR (B.uId = '. $sId .')';
            $watchnames = $userservice->getWatchNames($sId, true);
            foreach($watchnames as $watchuser) {
                $privacy .= ' OR (U.username = "'. $watchuser .'" AND B.bStatus = 1)'; 
            }
            $privacy .= ')';
        } else {
            // Just public bookmarks
            $privacy = ' AND B.bStatus = 0';
        }

        $sql = 'SELECT COUNT(*) FROM '. $userservice->getTableName() .' AS U, '. $GLOBALS['tableprefix'] .'bookmarks AS B WHERE U.'. $userservice->getFieldName('primary') .' = B.uId AND B.bHash = "'. md5($address) .'"'. $privacy;
        if (!($dbresult = & $this->db->sql_query($sql))) {
            message_die(GENERAL_ERROR, 'Could not get vars', '', __LINE__, __FILE__, $sql, $this->db);
        }
        return $this->db->sql_fetchfield(0, 0) - 1;
    }
}
?>