<?php

namespace Questo\Service;

class CacheService
{
    /**
     * Clear existing plugins
     */
    public function clearCachePlugins()
    {
        // Check if get_plugins() function exists. This is required on the front end of the
        // site, since it is in a file that is normally only loaded in the admin.
        if (!function_exists('get_plugins')) {
            require_once ABSPATH . 'wp-admin/includes/plugin.php';
        }

        $pluginsToClear = array(
            array(
                'name'   => 'W3 Total Cache',
                'method' => 'w3tc_flush_all',
            ),
            array(
                'name'   => 'WP Super Cache',
                'method' => 'wp_cache_clean_cache',
            ),
            array(
                'name'   => 'WP Fastest Cache',
                'class'  => 'wpFastestCache',
                'method' => 'deleteCache',
            ),
            array(
                'name'   => 'Comet Cache',
                'class'  => 'WebSharks\CometCache\Classes\ApiBase',
                'method' => 'clear',
            ),
        );

        $installedPlugins = get_plugins();
        $pluginNames = array();

        foreach ($installedPlugins as $installedPlugin) {
            $pluginNames[$installedPlugin['Name']] = $installedPlugin;
        }
        foreach ($pluginsToClear as $plugin) {
            $currentPlugin = (isset($pluginNames[$plugin['name']]) ? $pluginNames[$plugin['name']] : false);
            if ($currentPlugin) {
                switch ($plugin['name']) {
                    case 'W3 Total Cache':
                        $method = $plugin['method'];

                        if (function_exists($method)) {
                            $method();
                        }

                        break;
                    case 'WP Super Cache':
                        global $file_prefix;
                        $method = $plugin['method'];

                        if (function_exists($method)) {
                            $method($file_prefix);
                        }

                        break;
                    case 'WP Fastest Cache':
                    case 'Comet Cache':
                        $object = $this->createCacheObject($plugin['class']);
                        if ($object) {
                            $this->clearCache($object, $plugin['method']);
                        }
                        break;
                }
            }
        }
    }

    /**
     * @param string $class
     * @return object|bool
     */
    public function createCacheObject($class)
    {
        return (class_exists($class) ? new $class() : false);
    }

    /**
     * @param object $object
     * @param string $method
     */
    public function clearCache($object, $method)
    {
        if (method_exists($object, $method)) {
            $object->$method();
        }
    }
}