<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\console\controllers;

use Yii;
use yii\console\Controller;
use yii\console\Exception;
use yii\caching\Cache;

/**
 * Allows you to flush cache.
 *
 * @author Alexander Makarov <sam@rmcreative.ru>
 * @since 2.0
 */
class CacheController extends Controller
{
    /**
     * Lists the caches that can be flushed.
     */
    public function actionIndex()
    {
        $caches = [];
        $components = Yii::$app->getComponents();
        foreach ($components as $name => $component) {
            if ($component instanceof Cache) {
                $caches[$name] = get_class($component);
            } elseif (is_array($component) && isset($component['class']) && strpos($component['class'], 'Cache') !== false) {
                $caches[$name] = $component['class'];
            }
        }
        if (!empty($caches)) {
            echo "The following caches can be flushed:\n\n";
            foreach ($caches as $name => $class) {
                echo " * $name: $class\n";
            }
        } else {
            echo "No cache is used.\n";
        }
    }

    /**
     * Flushes cache.
     * @param string $component Name of the cache application component to use.
     *
     * @throws \yii\console\Exception
     */
    public function actionFlush($component = 'cache')
    {
        /* @var $cache Cache */
        $cache = Yii::$app->get($component, false);
        if (!$cache || !$cache instanceof Cache) {
            throw new Exception('Application component "'.$component.'" is not defined or not a cache.');
        }

        if (!$cache->flush()) {
            throw new Exception('Unable to flush cache.');
        }

        echo "\nDone.\n";
    }
}