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<?php

/**
 * Common functions used in the controller for getting/setting current classes,
 * redirecting URLs, and working with the context.
 * @package core
 * @subpackage functions\functions-controller
 */
// force UTF-8 Ø

/**
 * Creates a "REWRITE" url given the query parameters that represent the link
 *
 * @param type $query
 * @return string
 */
function zpRewriteURL($query) {
    $redirectURL = '';
    if (isset($query['p'])) {
        sanitize($query);
        switch ($query['p']) {
            case 'news':
                $redirectURL = _NEWS_;
                if (isset($query['category'])) {
                    $obj = new ZenpageCategory($query['category'], false);
                    if (!$obj->loaded)
                        return '';
                    $redirectURL = $obj->getLink();
                    unset($query['category']);
                } else if (isset($query['date'])) {
                    $redirectURL = _NEWS_ARCHIVE_ . '/' . $query['date'];
                    unset($query['date']);
                }
                if (isset($query['title'])) {
                    $obj = new ZenpageNews($query['title'], false);
                    if (!$obj->loaded)
                        return '';
                    $redirectURL = $obj->getLink();
                    unset($query['title']);
                }
                break;
            case 'pages':
                $redirectURL = _PAGES_;
                if (isset($query['title'])) {
                    $obj = new ZenpagePage($query['title'], false);
                    if (!$obj->loaded)
                        return '';
                    $redirectURL = $obj->getLink();
                    unset($query['title']);
                }
                break;
            case'search':
                $redirectURL = _SEARCH_;
                if (isset($query['date'])) {
                    $redirectURL = _ARCHIVE_ . '/' . $query['date'];
                    unset($query['date']);
                } else if (isset($query['searchfields']) && $query['searchfields'] == 'tags') {
                    $redirectURL = _TAGS_;
                    unset($query['searchfields']);
                }
                if (isset($query['words'])) {
                    $redirectURL .= '/' . $query['words'];
                    unset($query['words']);
                }
                break;
            default:
                $redirectURL = getCustomPageURL($query['p']);
                break;
        }
        unset($query['p']);
        $redirectURL = preg_replace('~^' . WEBPATH . '/~', '', $redirectURL);
        if (isset($query['page'])) {
            $redirectURL.='/' . $query['page'];
            unset($query['page']);
        }
        $q = http_build_query($query);
        if ($q)
            $redirectURL .= '?' . $q;
    } else if (isset($query['album'])) {
        if (isset($query['image'])) {
            $obj = newImage(NULL, array('folder' => $query['album'], 'filename' => $query['image']), true);
            unset($query['image']);
        } else {
            $obj = newAlbum($query['album'], NULL, true);
        }
        unset($query['album']);
        if (!$obj->exists)
            return '';
        $redirectURL = preg_replace('~^' . WEBPATH . '/~', '', $obj->getLink());
        $q = http_build_query($query);
        if ($q)
            $redirectURL .= '?' . $q;
    }
    return $redirectURL;
}

/**
 * Checks to see if the current URL is a query string url when mod_rewrite is active.
 * If so it will redirects to the rewritten URL with a 301 Moved Permanently.
 */
function fix_path_redirect() {
    if (MOD_REWRITE) {
        $request_uri = getRequestURI();
        $parts = parse_url($request_uri);
        if (isset($parts['query'])) {
            parse_str($parts['query'], $query);
            $redirectURL = zpRewriteURL($query);
            if ($redirectURL) {
                redirectURL($redirectURL, '301');
            }
        }
    }
}

function zp_load_page($pagenum = NULL) {
    global $_zp_page;
    if (!is_numeric($pagenum)) {
        $_zp_page = isset($_GET['page']) ? $_GET['page'] : 1;
    } else {
        $_zp_page = round($pagenum);
    }
}

/**
 * initializes the gallery.
 */
function zp_load_gallery() {
    global $_zp_current_album, $_zp_current_album_restore, $_zp_albums,
    $_zp_current_image, $_zp_current_image_restore, $_zp_images, $_zp_current_comment,
    $_zp_comments, $_zp_current_context, $_zp_current_search, $_zp_current_zenpage_new,
    $_zp_current_zenpage_page, $_zp_current_category, $_zp_post_date, $_zp_pre_authorization;
    $_zp_current_album = NULL;
    $_zp_current_album_restore = NULL;
    $_zp_albums = NULL;
    $_zp_current_image = NULL;
    $_zp_current_image_restore = NULL;
    $_zp_images = NULL;
    $_zp_current_comment = NULL;
    $_zp_comments = NULL;
    $_zp_current_context = 0;
    $_zp_current_search = NULL;
    $_zp_current_zenpage_news = NULL;
    $_zp_current_zenpage_page = NULL;
    $_zp_current_category = NULL;
    $_zp_post_date = NULL;
    $_zp_pre_authorization = array();
    set_context(ZP_INDEX);
}

/**
 * Loads the search object.
 */
function zp_load_search() {
    global $_zp_current_search;
    zp_clearCookie("zpcms_search_params");
    if (!is_object($_zp_current_search)) {
        $_zp_current_search = new SearchEngine();
    }
    add_context(ZP_SEARCH);
    $params = $_zp_current_search->getSearchParams();
    zp_setCookie("zpcms_search_params", $params, SEARCH_DURATION);
    return $_zp_current_search;
}

/**
 * zp_load_album - loads the album given by the folder name $folder into the
 * global context, and sets the context appropriately.
 * @param $folder the folder name of the album to load. Ex: 'testalbum', 'test/subalbum', etc.
 * @param $force_cache whether to force the use of the global object cache.
 * @return the loaded album object on success, or (===false) on failure.
 */
function zp_load_album($folder, $force_nocache = false) {
    global $_zp_current_album, $_zp_gallery;
    $_zp_current_album = newAlbum($folder, !$force_nocache, true);
    if (!is_object($_zp_current_album) || !$_zp_current_album->exists)
        return false;
    add_context(ZP_ALBUM);
    return $_zp_current_album;
}

/**
 * zp_load_image - loads the image given by the $folder and $filename into the
 * global context, and sets the context appropriately.
 * @param $folder is the folder name of the album this image is in. Ex: 'testalbum'
 * @param $filename is the filename of the image to load.
 * @return the loaded album object on success, or (===false) on failure.
 */
function zp_load_image($folder, $filename) {
    global $_zp_current_image, $_zp_current_album, $_zp_current_search;
    if (!is_object($_zp_current_album) || $_zp_current_album->name != $folder) {
        $album = zp_load_album($folder, true);
    } else {
        $album = $_zp_current_album;
    }
    if (!is_object($album) || !$album->exists)
        return false;
    $_zp_current_image = newImage($album, $filename, true);
    if (is_null($_zp_current_image) || !$_zp_current_image->exists) {
        return false;
    }
    add_context(ZP_IMAGE | ZP_ALBUM);
    return $_zp_current_image;
}

/**
 * Loads a zenpage pages page
 * Sets up $_zp_current_zenpage_page and returns it as the function result.
 * @param $titlelink the titlelink of a zenpage page to setup a page object directly. Used for custom
 * page scripts based on a zenpage page.
 *
 * @return object
 */
function load_zenpage_pages($titlelink) {
    global $_zp_current_zenpage_page;
    if (!ZP_PAGES_ENABLED) {
        return false;
    }
    $_zp_current_zenpage_page = new ZenpagePage($titlelink);
    if ($_zp_current_zenpage_page->loaded) {
        add_context(ZP_ZENPAGE_PAGE | ZP_ZENPAGE_SINGLE);
    } else {
        $_GET['p'] = 'PAGES:' . $titlelink;
        return false;
    }
    return $_zp_current_zenpage_page;
}

/**
 * Loads a zenpage news article
 * Sets up $_zp_current_zenpage_news and returns it as the function result.
 *
 * @param array $request an array with one member: the key is "date", "category", or "title" and specifies
 * what you want loaded. The value is the date or title of the article wanted
 *
 * @return object
 */
function load_zenpage_news($request) {
    global $_zp_current_zenpage_news, $_zp_current_category, $_zp_post_date;
    if (!ZP_NEWS_ENABLED) {
        return false;
    }
    if (isset($request['date'])) {
        add_context(ZP_ZENPAGE_NEWS_DATE);
        $_zp_post_date = removeTrailingSlash(sanitize($request['date']));
    }
    if (isset($request['category'])) {
        $titlelink = sanitize(rtrim($request['category'], '/'));
        $_zp_current_category = new ZenpageCategory($titlelink);
        if ($_zp_current_category->loaded) {
            add_context(ZP_ZENPAGE_NEWS_CATEGORY);
        } else {
            $_GET['p'] = 'CATEGORY:' . $titlelink;
            unset($_GET['category']);
            return false;
        }
    }
    if (isset($request['title'])) {
        $titlelink = sanitize(rtrim($request['title'], '/'));
        $sql = 'SELECT `id` FROM ' . prefix('news') . ' WHERE `titlelink`=' . db_quote($titlelink);
        $result = query_single_row($sql);
        if (is_array($result)) {
            add_context(ZP_ZENPAGE_NEWS_ARTICLE | ZP_ZENPAGE_SINGLE);
            $_zp_current_zenpage_news = new ZenpageNews($titlelink);
        } else {
            $_GET['p'] = 'NEWS:' . $titlelink;
        }
        return $_zp_current_zenpage_news;
    }
    return true;
}

/**
 * Figures out what is being accessed and calls the appropriate load function
 *
 * @return bool
 */
function zp_load_request() {
    if ($success = zp_apply_filter('load_request', true)) { // filter allowed the load
        zp_load_page();
        if (isset($_GET['p'])) {
            $page = str_replace(array('/', '\\', '.'), '', sanitize($_GET['p']));
            switch ($page) {
                case 'search':
                    return zp_load_search();
                    break;
                case 'pages':
                    if (extensionEnabled('zenpage')) {
                        return load_zenpage_pages(sanitize(rtrim(@$_GET['title'], '/')));
                    }
                    break;
                case 'news':
                    if (extensionEnabled('zenpage')) {
                        return load_zenpage_news(sanitize($_GET));
                    }
                    break;
            }
        }
        //  may need image and album parameters processed
        list($album, $image) = rewrite_get_album_image('album', 'image');
        if (!empty($image)) {
            return zp_load_image($album, $image);
        } else if (!empty($album)) {
            return zp_load_album($album);
        }
    }
    return $success;
}

/**
 *
 * sets up for loading the index page
 * @return string
 */
function prepareIndexPage() {
    global $_zp_gallery_page, $_zp_script;
    handleSearchParms('index');
    $theme = setupTheme();
    $_zp_gallery_page = basename($_zp_script = THEMEFOLDER . "/$theme/index.php");
    return $theme;
}

/**
 *
 * sets up for loading an album page
 */
function prepareAlbumPage() {
    global $_zp_current_album, $_zp_gallery_page, $_zp_script;
    $theme = setupTheme();
    $_zp_gallery_page = "album.php";
    $_zp_script = THEMEFOLDER . "/$theme/album.php";
    if ($search = $_zp_current_album->getSearchEngine()) {
        zp_setCookie("zpcms_search_params", $search->getSearchParams(), SEARCH_DURATION);
    } else {
        handleSearchParms('album', $_zp_current_album);
    }
    return $theme;
}

/**
 *
 * sets up for loading an image page
 * @return string
 */
function prepareImagePage() {
    global $_zp_current_album, $_zp_current_image, $_zp_gallery_page, $_zp_script;
    handleSearchParms('image', $_zp_current_album, $_zp_current_image);
    $theme = setupTheme();
    $_zp_gallery_page = basename($_zp_script = THEMEFOLDER . "/$theme/image.php");
    // re-initialize video dimensions if needed
    if (isImageVideo()) {
        $_zp_current_image->updateDimensions();
    }
    return $theme;
}

/**
 *
 * sets up for loading p=page pages
 * @return string
 */
function prepareCustomPage() {
    global $_zp_current_album, $_zp_current_image, $_zp_gallery_page, $_zp_script, $_zp_current_search;
    $searchalbums = handleSearchParms('page', $_zp_current_album, $_zp_current_image);
    $album = NULL;
    $replace = array('/', '\\', '.');
    $page = str_replace($replace, '', sanitize($_GET['p']));
    if (isset($_GET['z'])) { // system page
        if ($subfolder = str_replace($replace, '', sanitize($_GET['z']))) {
            $subfolder .= '/';
        }
        $_zp_gallery_page = $page . '.php';
        $_zp_script = ZENFOLDER . '/' . $subfolder . $page . '.php';
    } else {
        $_zp_gallery_page = $page . '.php';
        switch ($_zp_gallery_page) {
            case 'search.php':
                if (!empty($searchalbums)) { // we are within a search of a specific album(s)
                    $albums = array();
                    foreach ($searchalbums as $analbum) {
                        $parent = getUrAlbum(newAlbum($analbum));
                        $albums[$parent->getID()] = $parent;
                    }
                    if (count($albums) == 1) { // there is only one parent album for the search
                        $album = array_shift($albums);
                    }
                }
                break;
        }
    }
    $theme = setupTheme($album);
    if (empty($_zp_script)) {
        $_zp_script = THEMEFOLDER . "/$theme/$page.php";
    }
    return $theme;
}

/**
 * Handles redirections via filter hook "redirection_handler".
 * It is meant to perform redirections of pages that have been removed or renamed.
 * 
 * @since ZenphotoCMS 1.5.2
 */
function redirectionHandler() {
    if (zp_has_filter('redirection_handler')) {
        $url = SERVER_HTTP_HOST . getRequestURI();
        $redirect_url = zp_apply_filter('redirection_handler', $url);
        if ($redirect_url != $url) {
            redirectURL($redirect_url, '301');
        }
    }
}

//force license page if not acknowledged
if (!getOption('license_accepted')) {
    if (isset($_GET['z']) && $_GET['z'] != 'setup') {
// License needs agreement
        $_GET['p'] = 'license';
        $_GET['z'] = '';
    }
}
?>