local-currency.php

<?php
/**
 * Plugin Name: WC Local Currency Display
 * Plugin URI: https://example.com
 * Description: Displays WooCommerce product prices in the visitor's local currency based on their IP address.
 * Version: 1.0.0
 * Author: Your Name
 * Author URI: https://example.com
 * Text Domain: wc-local-currency
 * WC requires at least: 5.0
 * WC tested up to: 8.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class WC_Local_Currency_Display {

	private static $instance = null;
	private $api_url = 'https://api.exchangerate-api.com/v4/latest/';
	private $target_currency = '';
	private $base_currency = '';

	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action( 'plugins_loaded', [ $this, 'init' ] );
		add_action( 'before_woocommerce_init', [ $this, 'declare_hpos_compatibility' ] );
	}

	/**
	 * Declare compatibility with High-Performance Order Storage (HPOS).
	 */
	/**
	 * Declare compatibility with High-Performance Order Storage (HPOS).
	 * 
	 * HPOS is WooCommerce’s modern order-storage layer that moves orders from wp_posts into custom tables.
	 * By explicitly declaring this plugin compatible we:
	 * 1. Prevent WooCommerce from showing a “This plugin may not work with HPOS” warning.
	 * 2. Signal that we do NOT read/write postmeta for orders in a way that would break under HPOS.
	 * 3. Allow merchants to enable HPOS without fear of data corruption.
	 * 
	 * The check for FeaturesUtil::class guarantees we only call the API when WC 7.1+ is present.
	 */
	public function declare_hpos_compatibility() {
		if ( class_exists( \Automattic\WooCommerce\Utilities\FeaturesUtil::class ) ) {
			\Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility( 'custom_order_tables', __FILE__, true );
		}
	}

	public function init() {
		if ( ! class_exists( 'WooCommerce' ) ) {
			return;
		}

		$this->base_currency = get_woocommerce_currency();
		$this->target_currency = $this->get_visitor_currency();

		// Only apply if target currency is different from base currency
		if ( $this->target_currency !== $this->base_currency ) {
			add_filter( 'woocommerce_get_price_html', [ $this, 'format_local_price_html' ], 10, 2 );
			add_action( 'wp_enqueue_scripts', [ $this, 'enqueue_styles' ] );
		}
	}

	/**
	 * Detect visitor currency based on geolocation.
	 */
	private function get_visitor_currency() {
		if ( ! class_exists( 'WC_Geolocation' ) ) {
			return 'BDT'; // Default to BDT as requested
		}

		$location = WC_Geolocation::geolocate_ip();
		$country  = isset( $location['country'] ) ? strtoupper($location['country']) : 'BD';

		if ( empty( $country ) ) {
			$country = 'BD';
		}

		return $this->get_currency_by_country( $country );
	}

	/**
	 * Map country codes to currency codes.
	 */
	private function get_currency_by_country( $country ) {
		$currency = [
			'BD' => 'BDT',
			'US' => 'USD',
			'GB' => 'GBP',
			'FR' => 'EUR',
			'DE' => 'EUR',
			'IT' => 'EUR',
			'ES' => 'EUR',
			'NL' => 'EUR',
			'BE' => 'EUR',
			'AT' => 'EUR',
			'PT' => 'EUR',
			'IE' => 'EUR',
			'FI' => 'EUR',
			'GR' => 'EUR',
			'IN' => 'INR',
			'AU' => 'AUD',
			'CA' => 'CAD',
			'SG' => 'SGD',
			'MY' => 'MYR',
			'JP' => 'JPY',
			'CN' => 'CNY',
			'PK' => 'PKR',
			'LK' => 'LKR',
			'NP' => 'NPR',
			'AE' => 'AED',
			'SA' => 'SAR',
			'TR' => 'TRY',
			'ZA' => 'ZAR',
			'NZ' => 'NZD',
			'CH' => 'CHF',
			'SE' => 'SEK',
			'NO' => 'NOK',
			'DK' => 'DKK',
			'HK' => 'HKD',
		];

		return isset( $currency[ $country ] ) ? $currency[ $country ] : 'BDT';
	}

	/**
	 * Fetch exchange rates with caching.
	 */
	private function get_exchange_rate() {
		$cache_key = 'wc_local_currency_rate_' . $this->base_currency . '_' . $this->target_currency;
		$rate      = get_transient( $cache_key );

		if ( false === $rate ) {
			$response = wp_remote_get( $this->api_url . strtolower( $this->base_currency ) );

			if ( is_wp_error( $response ) ) {
				return 1;
			}

			$data = json_decode( wp_remote_retrieve_body( $response ), true );

			if ( isset( $data['rates'][ $this->target_currency ] ) ) {
				$rate = $data['rates'][ $this->target_currency ];
				set_transient( $cache_key, $rate, DAY_IN_SECONDS );
			} else {
				$rate = 1;
			}
		}

		return $rate;
	}

	/**
	 * Format the price HTML to include local currency.
	 */
	public function format_local_price_html( $price_html, $product ) {
		if ( is_admin() || is_cart() || is_checkout() ) {
			return $price_html;
		}

		$rate = $this->get_exchange_rate();
		if ( 1 == $rate ) {
			return $price_html;
		}

		if ( $product->is_type( 'variable' ) ) {
			$min_price = $product->get_variation_price( 'min' );
			$max_price = $product->get_variation_price( 'max' );

			if ( $min_price !== $max_price ) {
				$local_min = $min_price * $rate;
				$local_max = $max_price * $rate;
				
				$local_price_formatted = sprintf(
					'%s &ndash; %s',
					wc_price( $local_min, [ 'currency' => $this->target_currency ] ),
					wc_price( $local_max, [ 'currency' => $this->target_currency ] )
				);
			} else {
				$local_price_formatted = wc_price( $min_price * $rate, [ 'currency' => $this->target_currency ] );
			}
		} else {
			$price = $product->get_price();
			if ( ! $price ) {
				return $price_html;
			}
			$local_price_formatted = wc_price( $price * $rate, [ 'currency' => $this->target_currency ] );
		}

		return sprintf( 
			'<span class="wc-local-price">%s</span> <small class="wc-original-price-bracket">(%s)</small>',
			$local_price_formatted,
			$price_html
		);
	}

	/**
	 * Enqueue simple CSS for the bracketed price.
	 */
	public function enqueue_styles() {
		$css = "
			.wc-original-price-bracket {
				font-size: 0.8em;
				color: #777;
				margin-left: 5px;
			}
			.wc-original-price-bracket ins {
				text-decoration: none;
			}
			.wc-original-price-bracket del {
				display: none; /* Hide original sale price in bracket to keep it clean */
			}
		";
		wp_add_inline_style( 'woocommerce-general', $css );
	}
}

WC_Local_Currency_Display::get_instance();