<?php



/**

 * W3 DbCache plugin

 */

if (!defined('W3TC')) {

    die();

}



w3_require_once(W3TC_LIB_W3_DIR . '/Plugin.php');



/**

 * Class W3_Plugin_DbCache

 */

class W3_Plugin_DbCache extends W3_Plugin {

    /**

     * Runs plugin

     */

    function run() {

        add_filter('cron_schedules', array(

            &$this,

            'cron_schedules'

        ));



        if ($this->_config->get_string('dbcache.engine') == 'file') {

            add_action('w3_dbcache_cleanup', array(

                &$this,

                'cleanup'

            ));

        }



        add_action('publish_phone', array(

            &$this,

            'on_change'

        ), 0);



        add_action('wp_trash_post', array(

            &$this,

            'on_change'

        ), 0);



        add_action('save_post', array(

            &$this,

            'on_change'

        ), 0);



        global $wp_version;

        if (version_compare($wp_version,'3.5', '>=')) {

            add_action('clean_post_cache', array(

            &$this,

            'on_change'

            ), 0, 2);

        }



        add_action('comment_post', array(

            &$this,

            'on_change'

        ), 0);



        add_action('edit_comment', array(

            &$this,

            'on_change'

        ), 0);



        add_action('delete_comment', array(

            &$this,

            'on_change'

        ), 0);



        add_action('wp_set_comment_status', array(

            &$this,

            'on_change'

        ), 0);



        add_action('trackback_post', array(

            &$this,

            'on_change'

        ), 0);



        add_action('pingback_post', array(

            &$this,

            'on_change'

        ), 0);



        add_action('switch_theme', array(

            &$this,

            'on_change'

        ), 0);



        add_action('edit_user_profile_update', array(

            &$this,

            'on_change'

        ), 0);



        if (w3_is_multisite()) {

            add_action('delete_blog', array(

                &$this,

                'on_change'

            ), 0);

        }



        add_action('delete_post', array(

            &$this,

            'on_change'

        ), 0);

    }



    /**

     * Activate plugin action (called by W3_Plugins)

     */

    function activate() {

        w3_require_once(W3TC_INC_DIR . '/functions/activation.php');



        $this->create_required_files(true);

        

        $this->schedule();

    }

    

    /**

     * Deactivate plugin action (called by W3_Plugins)

     */

    function deactivate() {

        $this->unschedule();

        return null;

    }



    /**

     * Called after configuration change

     */

    function after_config_change() {

        $this->create_required_files();

        $this->schedule();

    }

    

    /**

     * Creates addin files

     * 

     * @param $force_overwrite boolean

     */

    function create_required_files($force_overwrite = false) {

        w3_require_once(W3TC_INC_DIR . '/functions/activation.php');

        

        if (!file_exists(W3TC_ADDIN_FILE_DB) || $force_overwrite) {

            try{

                w3_copy_if_not_equal(W3TC_INSTALL_FILE_DB, W3TC_ADDIN_FILE_DB);

            } catch (Exception $ex){}

        }

    }



    /**

     * Schedules events

     */

    function schedule() {

        if ($this->_config->get_boolean('dbcache.enabled') && $this->_config->get_string('dbcache.engine') == 'file') {

            if (!wp_next_scheduled('w3_dbcache_cleanup')) {

                wp_schedule_event(current_time('timestamp'), 'w3_dbcache_cleanup', 'w3_dbcache_cleanup');

            }

        } else {

            $this->unschedule();

        }

    }

    

    /**

     * Unschedules events

     */

    function unschedule() {

        if (wp_next_scheduled('w3_dbcache_cleanup')) {

            wp_clear_scheduled_hook('w3_dbcache_cleanup');

        }

    }

    

    /**

     * Does disk cache cleanup

     *

     * @return void

     */

    function cleanup() {

        w3_require_once(W3TC_LIB_W3_DIR . '/Cache/File/Cleaner.php');

        

        $w3_cache_file_cleaner = new W3_Cache_File_Cleaner(array(

            'cache_dir' => w3_cache_blog_dir('db'),

            'clean_timelimit' => $this->_config->get_integer('timelimit.cache_gc')

        ));

        

        $w3_cache_file_cleaner->clean();

    }

    

    /**

     * Cron schedules filter

     *

     * @param array $schedules

     * @return array

     */

    function cron_schedules($schedules) {

        $gc = $this->_config->get_integer('dbcache.file.gc');



        return array_merge($schedules, array(

            'w3_dbcache_cleanup' => array(

                'interval' => $gc,

                'display' => sprintf('[W3TC] Database Cache file GC (every %d seconds)', $gc)

            )

        ));

    }



    /**

     * Change action

     */

    function on_change($post_id = 0, $post = null) {

        static $flushed = false;



        if (!$flushed) {

            if (is_null($post))

                $post = $post_id;



            if ($post_id>0 && !w3_is_flushable_post($post, 'dbcache', $this->_config)) {

                return;

            }



            $flusher = w3_instance('W3_CacheFlush');

            $flusher->dbcache_flush();

            

            $flushed = true;

        }

    }

}

