<?php

namespace WPMailSMTP;

/**
 * Class Geo to work with location, domain, IPs etc.
 *
 * @since 1.5.0
 */
class Geo {

	/**
	 * Get the current site hostname.
	 * Examples: example.com, localhost.
	 *
	 * @since 1.5.0
	 *
	 * @return string
	 */
	public static function get_site_domain() {

		return ! empty( $_SERVER['SERVER_NAME'] ) ? $_SERVER['SERVER_NAME'] : wp_parse_url( get_home_url( get_current_blog_id() ), PHP_URL_HOST );
	}

	/**
	 * Get the domain IP address.
	 * Uses gethostbyname() which is quite slow, but this is done only one time.
	 *
	 * @since 1.5.0
	 *
	 * @param string $domain
	 *
	 * @return string
	 */
	public static function get_ip_by_domain( $domain ) {

		if ( $domain === 'localhost' ) {
			return '127.0.0.1';
		}

		return gethostbyname( $domain );
	}

	/**
	 * Get the location coordinates by IP address.
	 * We make a request to 3rd party services.
	 *
	 * @since 1.5.0
	 *
	 * @param string $ip
	 *
	 * @return array Empty array for localhost.
	 */
	public static function get_location_by_ip( $ip ) {

		// Check for a non-local IP.
		if ( empty( $ip ) || in_array( $ip, array( '127.0.0.1', '::1' ), true ) ) {
			return array();
		}

		$request = wp_remote_get( 'https://ipapi.co/' . $ip . '/json' );

		if ( ! is_wp_error( $request ) ) {

			$request = json_decode( wp_remote_retrieve_body( $request ), true );

			if ( ! empty( $request['latitude'] ) && ! empty( $request['longitude'] ) ) {

				$data = array(
					'latitude'  => sanitize_text_field( $request['latitude'] ),
					'longitude' => sanitize_text_field( $request['longitude'] ),
					'city'      => sanitize_text_field( $request['city'] ),
					'region'    => sanitize_text_field( $request['region'] ),
					'country'   => sanitize_text_field( $request['country'] ),
					'postal'    => sanitize_text_field( $request['postal'] ),
				);

				return $data;
			}
		}

		$request = wp_remote_get( 'https://tools.keycdn.com/geo.json?host=' . $ip );

		if ( ! is_wp_error( $request ) ) {

			$request = json_decode( wp_remote_retrieve_body( $request ), true );

			if ( ! empty( $request['data']['geo']['latitude'] ) && ! empty( $request['data']['geo']['longitude'] ) ) {

				$data = array(
					'latitude'  => sanitize_text_field( $request['data']['geo']['latitude'] ),
					'longitude' => sanitize_text_field( $request['data']['geo']['longitude'] ),
					'city'      => sanitize_text_field( $request['data']['geo']['city'] ),
					'region'    => sanitize_text_field( $request['data']['geo']['region_name'] ),
					'country'   => sanitize_text_field( $request['data']['geo']['country_code'] ),
					'postal'    => sanitize_text_field( $request['data']['geo']['postal_code'] ),
				);

				return $data;
			}
		}

		return array();
	}

	/**
	 * This routine calculates the distance between two points (given the latitude/longitude of those points).
	 * Definitions: South latitudes are negative, east longitudes are positive.
	 *
	 * @see   https://www.geodatasource.com/developers/php
	 *
	 * @since 1.5.0
	 *
	 * @param float  $lat1 Latitude of point 1 (in decimal degrees).
	 * @param float  $lon1 Longitude of point 1 (in decimal degrees).
	 * @param float  $lat2 Latitude of point 2 (in decimal degrees).
	 * @param float  $lon2 Longitude of point 2 (in decimal degrees).
	 * @param string $unit Supported values: M, K, N. Miles by default.
	 *
	 * @return float|int
	 */
	public static function get_distance_between( $lat1, $lon1, $lat2, $lon2, $unit = 'M' ) {

		if ( ( $lat1 === $lat2 ) && ( $lon1 === $lon2 ) ) {
			return 0;
		}

		$theta = $lon1 - $lon2;
		$dist  = sin( deg2rad( $lat1 ) ) * sin( deg2rad( $lat2 ) ) + cos( deg2rad( $lat1 ) ) * cos( deg2rad( $lat2 ) ) * cos( deg2rad( $theta ) );
		$dist  = acos( $dist );
		$dist  = rad2deg( $dist );
		$miles = $dist * 60 * 1.1515;
		$unit  = strtoupper( $unit );

		if ( $unit === 'K' ) {
			return ( $miles * 1.609344 );
		} elseif ( $unit === 'N' ) {
			return ( $miles * 0.8684 );
		}

		return $miles;
	}
}