<?php

namespace Zotlabs\Extend;

use App;

/**
 * @brief Hook class.
 *
 */
class Hook
{

    public static function register($hook, $file, $function, $version = 1, $priority = 0)
    {
        if (is_array($function)) {
            $function = serialize($function);
        }

        $r = q(
            "SELECT * FROM hook WHERE hook = '%s' AND file = '%s' AND fn = '%s' and priority = %d and hook_version = %d LIMIT 1",
            dbesc($hook),
            dbesc($file),
            dbesc($function),
            intval($priority),
            intval($version)
        );
        if ($r) {
            return true;
        }

        // To aid in upgrade and transition, remove old settings for any registered hooks that match in all respects except
        // for priority or hook_version

        $r = q(
            "DELETE FROM hook where hook = '%s' and file = '%s' and fn = '%s'",
            dbesc($hook),
            dbesc($file),
            dbesc($function)
        );

        $r = q(
            "INSERT INTO hook (hook, file, fn, priority, hook_version) VALUES ( '%s', '%s', '%s', %d, %d )",
            dbesc($hook),
            dbesc($file),
            dbesc($function),
            intval($priority),
            intval($version)
        );

        return $r;
    }

    public static function register_array($file, $arr)
    {
        if ($arr) {
            foreach ($arr as $k => $v) {
                self::register($k, $file, $v);
            }
        }
    }


    public static function unregister($hook, $file, $function, $version = 1, $priority = 0)
    {
        if (is_array($function)) {
            $function = serialize($function);
        }
        $r = q(
            "DELETE FROM hook WHERE hook = '%s' AND file = '%s' AND fn = '%s' and priority = %d and hook_version = %d",
            dbesc($hook),
            dbesc($file),
            dbesc($function),
            intval($priority),
            intval($version)
        );

        return $r;
    }

    /**
     * @brief Unregister all hooks with this file component.
     *
     * Useful for addon upgrades where you want to clean out old interfaces.
     *
     * @param string $file
     */

    public static function unregister_by_file($file)
    {
        $r = q(
            "DELETE FROM hook WHERE file = '%s' ",
            dbesc($file)
        );

        return $r;
    }

    /**
     * @brief Inserts a hook into a page request.
     *
     * Insert a short-lived hook into the running page request.
     * Hooks are normally persistent so that they can be called
     * across asynchronous processes such as delivery and poll
     * processes.
     *
     * insert_hook lets you attach a hook callback immediately
     * which will not persist beyond the life of this page request
     * or the current process.
     *
     * @param string $hook
     *     name of hook to attach callback
     * @param string $fn
     *     function name of callback handler
     * @param int $version
     *     hook interface version, 0 uses two callback params, 1 uses one callback param
     * @param int $priority
     *     currently not implemented in this function, would require the hook array to be resorted
     */
    public static function insert($hook, $fn, $version = 0, $priority = 0)
    {
        if (is_array($fn)) {
            $fn = serialize($fn);
        }

        if (! is_array(App::$hooks)) {
            App::$hooks = [];
        }

        if (! array_key_exists($hook, App::$hooks)) {
            App::$hooks[$hook] = [];
        }

        App::$hooks[$hook][] = [ '', $fn, $priority, $version ];
    }
}