<?php

namespace WP_Statistics\Service\Geolocation;

use WP_Error;
use WP_STATISTICS\Option;
use WP_Statistics\Service\Geolocation\Provider\CloudflareGeolocationProvider;
use WP_Statistics\Service\Geolocation\Provider\DbIpProvider;
use WP_Statistics\Service\Geolocation\Provider\MaxmindGeoIPProvider;

class GeolocationFactory
{
    /**
     * Holds a provider set to override the default provider.
     *
     * @var GeoServiceProviderInterface|null
     */
    private static $forcedProvider = null;

    /**
     * Get geolocation data for a given IP address using the configured provider.
     *
     * @param string $ipAddress
     * @return array
     */
    public static function getLocation(string $ipAddress, $provider = null)
    {
        self::$forcedProvider = $provider;

        $provider           = self::getProviderInstance();
        $geolocationService = new GeolocationService($provider);

        return $geolocationService->getGeolocation($ipAddress);
    }

    /**
     * Download the geolocation database using the configured provider.
     *
     * @return bool|WP_Error
     */
    public static function downloadDatabase($provider = null)
    {
        self::$forcedProvider = $provider;
        
        $provider           = self::getProviderInstance();
        $geolocationService = new GeolocationService($provider);

        return $geolocationService->downloadDatabase();
    }

    /**
     * Get an instance of the configured geolocation provider.
     *
     * @return MaxmindGeoIPProvider
     */
    public static function getProviderInstance()
    {
        $locationDetection = Option::get('geoip_location_detection_method', 'maxmind');

        if (
            'cf' === $locationDetection &&
            method_exists(CloudflareGeolocationProvider::class, 'isAvailable') &&
            CloudflareGeolocationProvider::isAvailable()
        ) {
            $geoIpProvider = CloudflareGeolocationProvider::class;
        } else {
            $geoIpProvider = 'dbip' === $locationDetection ? DbIpProvider::class : MaxmindGeoIPProvider::class;
        }

        if (! is_null(self::$forcedProvider)) {
            $geoIpProvider = self::$forcedProvider;
        }

        /**
         * Filter the geolocation provider name. This allows developers to change the provider used for geolocation.
         */
        $providerName = apply_filters('wp_statistics_geolocation_provider', $geoIpProvider);

        // If the provider class exists, instantiate it
        if (class_exists($providerName)) {
            return new $providerName();
        }

        return new MaxmindGeoIPProvider();
    }
}