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<?php

class ActionScheduler_Versions
{
    private static $instance = NULL;
    private $versions = array();
    public function register($version_string, $initialization_callback)
    {
        if (isset($this->versions[$version_string])) {
            return FALSE;
        }
        $this->versions[$version_string] = $initialization_callback;
        return TRUE;
    }
    public function get_versions()
    {
        return $this->versions;
    }
    public function latest_version()
    {
        $keys = array_keys($this->versions);
        if (empty($keys)) {
            return false;
        }
        uasort($keys, 'version_compare');
        return end($keys);
    }
    public function latest_version_callback()
    {
        $latest = $this->latest_version();
        if (empty($latest) || !isset($this->versions[$latest])) {
            return '__return_null';
        }
        return $this->versions[$latest];
    }
    public static function instance()
    {
        if (empty(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    public static function initialize_latest_version()
    {
        $self = self::instance();
        call_user_func($self->latest_version_callback());
    }
}