<?php

namespace Podlove;

class Geo_Ip
{
    const GEO_FILENAME = 'GeoLite2-City_20180206/GeoLite2-City.mmdb';
    const SOURCE_URL = 'http://cdn.podlove.org/publisher/GeoLite2-City_20180206.tar.gz';
    const TAR_NAME = '/tmp/GeoLite2-City_20180206.tar';

    /**
     * Register hooks.
     */
    public static function init()
    {
        add_filter('cron_schedules', [__CLASS__, 'cron_add_monthly']);
        add_action('podlove_geoip_db_update', [__CLASS__, 'update_database']);

        register_deactivation_hook(\Podlove\PLUGIN_FILE, [__CLASS__, 'stop_updater_cron']);
        register_activation_hook(\Podlove\PLUGIN_FILE, [__CLASS__, 'register_updater_cron']);
    }

    public static function register_updater_cron()
    {
        if (!wp_next_scheduled('podlove_geoip_db_update')) {
            wp_schedule_event(time(), 'monthly', 'podlove_geoip_db_update');
        }
    }

    public static function stop_updater_cron()
    {
        wp_clear_scheduled_hook('podlove_geoip_db_update');
    }

    public static function cron_add_monthly($schedules)
    {
        if (!isset($schedules['monthly'])) {
            $schedules['monthly'] = [
                'interval' => 2635200,
                'display' => __('Once a month', 'podlove-podcasting-plugin-for-wordpress'),
            ];
        }

        return $schedules;
    }

    /**
     * Is tracking enabled?
     *
     * @hook podlove_geo_tracking_is_enabled
     *
     * @return bool
     */
    public static function is_enabled()
    {
        $enabled = get_option('podlove_geo_tracking', 'on') === 'on';

        return apply_filters('podlove_geo_tracking_is_enabled', $enabled);
    }

    public static function disable_tracking()
    {
        update_option('podlove_geo_tracking', 'off');
    }

    public static function enable_tracking()
    {
        update_option('podlove_geo_tracking', 'on');
    }

    public static function is_db_valid()
    {
        try {
            $reader = new \GeoIp2\Database\Reader(self::get_upload_file_path());

            return true;
        } catch (\Exception $e) {
            return false;
        }
    }

    public static function get_upload_file_path()
    {
        return self::get_upload_file_dir().DIRECTORY_SEPARATOR.self::GEO_FILENAME;
    }

    public static function get_upload_file_dir()
    {
        $upload_dir = wp_upload_dir();

        return $upload_dir['basedir'];
    }

    public static function update_database()
    {
        set_time_limit(0);

        // for download_url()
        require_once ABSPATH.'wp-admin/includes/file.php';

        $tmpFile = \download_url(self::SOURCE_URL);

        if (is_wp_error($tmpFile)) {
            exit($tmpFile->get_error_message());
        }

        if (file_exists(self::TAR_NAME)) {
            unlink(self::TAR_NAME);
        }

        try {
            // decompress from gz
            $p = new \PharData($tmpFile);
            $file = $p->decompress(); // creates files.tar

            // unarchive from the tar
            $phar = new \PharData($file->getPath());
            $phar->extractTo(self::get_upload_file_dir(), null, true);
        } catch (Exception $e) {
            exit($e->getMessage());
        } catch (PharException $e) {
            exit($e->getMessage());
        }

        self::enable_tracking();
    }
}