<?php
// File name:	userpref.inc.php
// Description:	PHP subroutines to obtain user preferences
// Date:	2002-11-13
// Author:	imacat <imacat@pristine.com.tw>
// Copyright:	Copyright (C) 2002-2007 Pristine Communications

// Set the include path
if (!defined("INCPATH_SET")) {
    require_once dirname(__FILE__) . "/incpath.inc.php";
}
// Referenced subroutines
require_once "monica/guest.inc.php";
require_once "monica/login.inc.php";
require_once "monica/requri.inc.php";
require_once "monica/sql.inc.php";

// userpref: Obtain the specified user preference
function userpref($name, $domain = null)
{
    // Cache the result
    static $cache = array();
    // Set the default domain
    if (is_null($domain)) {
        $domain = REQUEST_PATH;
    }
    // Initialize the cache
    if (!array_key_exists($domain, $cache)) {
        $cache[$domain] = array();
    }
    // Return the cache
    if (array_key_exists($name, $cache[$domain])) {
        return $cache[$domain][$name];
    }
    
    // User system not available
    if (!use_users() || !isset($_SESSION)) {
        if (    array_key_exists("USERPREF", $GLOBALS)
                && array_key_exists($domain, $GLOBALS["USERPREF"])
                && array_key_exists($name, $GLOBALS["USERPREF"][$domain])) {
            $cache[$domain][$name] = $GLOBALS["USERPREF"][$domain][$name];
            return $cache[$domain][$name];
        }
        $cache[$domain][$name] = null;
        return null;
    }
    
    // User system is in use
    // Check guest preferences in $_SESSION
    if (is_guest()) {
        // Check the preference on this domain
        if (    array_key_exists("userpref", $_SESSION)
                && array_key_exists($domain, $_SESSION["userpref"])
                && array_key_exists($name, $_SESSION["userpref"][$domain])) {
            $cache[$domain][$name] = $_SESSION["userpref"][$domain][$name];
            return $cache[$domain][$name];
        }
        // Check the default preference
        if (    array_key_exists("userpref", $_SESSION)
                && array_key_exists("*", $_SESSION["userpref"])
                && array_key_exists($name, $_SESSION["userpref"]["*"])) {
            $cache[$domain][$name] = $_SESSION["userpref"]["*"][$name];
            return $cache[$domain][$name];
        }
    }
    
    // Already logged in -- check the user preference
    if (!is_null(get_login_sn())) {
        // Check the user preference on this domain
        $select = "SELECT value FROM userpref"
            . " WHERE usr=" . get_login_sn()
            . " AND domain='" . sql_esctext($domain) . "'"
            . " AND name='" . sql_esctext($name) . "';\n";
        $result = sql_query($select);
        if (sql_num_rows($result) == 1) {
            $row = sql_fetch_assoc($result);
            $cache[$domain][$name] = $row["value"];
            return $cache[$domain][$name];
        }
        
        // Check the default preference of this user
        $select = "SELECT value FROM userpref"
            . " WHERE usr=" . get_login_sn()
            . " AND domain IS NULL"
            . " AND name='" . sql_esctext($name) . "';\n";
        $result = sql_query($select);
        if (sql_num_rows($result) == 1) {
            $row = sql_fetch_assoc($result);
            $cache[$domain][$name] = $row["value"];
            return $cache[$domain][$name];
        }
    }
    
    // Check the default preference on this domain
    $select = "SELECT value FROM userpref"
        . " WHERE usr IS NULL"
        . " AND domain='" . sql_esctext($domain) . "'"
        . " AND name='" . sql_esctext($name) . "';\n";
    $result = sql_query($select);
    if (sql_num_rows($result) == 1) {
        $row = sql_fetch_assoc($result);
        $cache[$domain][$name] = $row["value"];
        return $cache[$domain][$name];
    }
    
    // Check the default preference for everything
    $select = "SELECT value FROM userpref"
        . " WHERE usr IS NULL"
        . " AND domain IS NULL"
        . " AND name='" . sql_esctext($name) . "';\n";
    $result = sql_query($select);
    if (sql_num_rows($result) == 1) {
        $row = sql_fetch_assoc($result);
        $cache[$domain][$name] = $row["value"];
        return $cache[$domain][$name];
    }
    
    // Preference not found
    $cache[$domain][$name] = null;
    return null;
}

?>