<?php
class randomImage
{
    /**
     * Usage:
     *
     * $imgSet = new randomImage($WikiTheme->file("images/pictures"));
     * $imgFile = "pictures/" . $imgSet->filename;
     */
    function randomImage($dirname)
    {

        $this->filename = ""; // Pick up your filename here.

        $_imageSet = new imageSet($dirname);
        $this->imageList = $_imageSet->getFiles();
        unset($_imageSet);

        if (empty($this->imageList)) {
            trigger_error(sprintf(_("%s is empty."), $dirname),
                E_USER_NOTICE);
        } else {
            $dummy = $this->pickRandom();
        }
    }

    function pickRandom()
    {
        better_srand(); // Start with a good seed.
        $this->filename = $this->imageList[array_rand($this->imageList)];
        //trigger_error(sprintf(_("random image chosen: %s"),
        //                      $this->filename),
        //              E_USER_NOTICE); //debugging
        return $this->filename;
    }
}

class imageSet extends fileSet
{
    /**
     * A file is considered an image when the suffix matches one from
     * $InlineImages.
     */
    function _filenameSelector($filename)
    {
        return preg_match("/(" . INLINE_IMAGES . ")$/i", $filename);
    }
}

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