Fix compatibility issue with Curcy Multi Currency plugin on the Gift Card product page - By WebToffee (WebToffee Gift Cards plugin)

functions.php

<?php //Do no copy this line of code
//Currency converter function
if(! function_exists('convert_curcy_price')){
	function convert_curcy_price( $price, $selected_currency, $previous_currency='') {
		if(class_exists('WOOMULTI_CURRENCY_F') && method_exists('WOOMULTI_CURRENCY_F_Data','get_ins')){
			$curcy_currency_settings = WOOMULTI_CURRENCY_F_Data::get_ins();
			$currency_list = $curcy_currency_settings->get_list_currencies();
			
			$force_convert = false;
			if( ''!== $previous_currency && $previous_currency !== $selected_currency ){
				$force_convert = true;
			}

			if( ( $selected_currency !== get_option('woocommerce_currency') && $price > 0 ) || true === $force_convert ) {
				$woo_currencies = get_woocommerce_currencies();
					
				if( '' !== $previous_currency ){
					$price = $price / floatval( $currency_list[ $previous_currency ]['rate'] );	
					if( $selected_currency === $previous_currency ){
						return $price;
					}
				}
				if ( !empty( $woo_currencies[$selected_currency] ) && !empty( $currency_list[ $selected_currency ]['rate'] ) ) {
					$price = $price * floatval( $currency_list[ $selected_currency ]['rate'] );		
				}
			}	
		}
		return $price;
	}
}

// Gift card page predefined amounts
add_filter('wt_gc_alter_giftcard_predifined_amounts',function($predefined){

	if(class_exists('WOOMULTI_CURRENCY_F')
		&& method_exists('WOOMULTI_CURRENCY_F_Data', 'get_ins')
		&& function_exists('convert_curcy_price')	
	){
		$curcy_currency_settings = WOOMULTI_CURRENCY_F_Data::get_ins();
		$current_currency = $curcy_currency_settings->get_current_currency();
		
		foreach($predefined as $key => $value){
			$predefined[$key] = convert_curcy_price($value, $current_currency);
		}	
	}
	return $predefined;
});

// Cart addition validation
add_filter( 'woocommerce_add_cart_item_data', function($cart_item_data, $product_id, $variation_id ){
	
	if(class_exists('Wbte_Gc_Gift_Card_Free_Common') && method_exists('Wbte_Gc_Gift_Card_Free_Common','is_gift_card_product'))
	{
		if(! Wbte_Gc_Gift_Card_Free_Common::is_gift_card_product($product_id)) {
			return $cart_item_data;
		}
	
		if(isset($cart_item_data['wt_credit_amount']) && class_exists('WOOMULTI_CURRENCY_F')){
			$cart_item_data['wt_credit_currency'] = isset($_COOKIE['wmc_current_currency']) ? $_COOKIE['wmc_current_currency']: get_option('woocommerce_currency');
		}
	}
	return $cart_item_data;

}, 11, 3 );

// Cart item Gift card price in cart table
add_filter( 'woocommerce_cart_item_price', function($product_price, $cart_item, $cart_item_key ){
	if(isset($cart_item['wt_credit_amount']) ){
		$product_price = (float) $cart_item['wt_credit_amount'];
		if ((class_exists('WOOMULTI_CURRENCY_F'))
			&& method_exists('WOOMULTI_CURRENCY_F_Data', 'get_ins')
			&& function_exists('convert_curcy_price')	
			&& isset($cart_item['wt_credit_currency'])) {
			$curcy_currency_settings = WOOMULTI_CURRENCY_F_Data::get_ins();
			$current_currency = $curcy_currency_settings->get_current_currency();
			
			if($current_currency !== $cart_item['wt_credit_currency'] || $cart_item['wt_credit_currency'] === get_option('woocommerce_currency')){
				$product_price = convert_curcy_price($product_price, $current_currency, $cart_item['wt_credit_currency']);
				$cart_item['wt_credit_amount'] = $product_price;
			}
		}
		return wp_kses_post( wc_price( $product_price ) );
	}
	return wp_kses_post( wc_price( $product_price ) );
}, 12, 3 );

// Cart item data - subtotal
add_action( 'woocommerce_before_calculate_totals', function($cart_obj){

	if (is_admin()) {
		return;
	}
	if(class_exists('WOOMULTI_CURRENCY_F') 
		&& method_exists('WOOMULTI_CURRENCY_F_Data', 'get_ins')
		&& function_exists('convert_curcy_price')	
	) {
		foreach ($cart_obj->get_cart() as $key => $item) {
			if (! isset( $item['wt_credit_amount'])) {
				continue;
			}
			$product_price = (float) $item['wt_credit_amount'];
			$curcy_currency_settings = WOOMULTI_CURRENCY_F_Data::get_ins();
			$current_currency = $curcy_currency_settings->get_current_currency();

			if($item['wt_credit_currency'] === get_option('woocommerce_currency')){
				continue;
			}
			$product_price = convert_curcy_price($product_price, $current_currency, $item['wt_credit_currency']);
			$item['wt_credit_amount'] = $product_price;
			$item['data']->set_price( $product_price );

		}
	}
}, 999, 1 );
 
// Applied store credit coupon 
add_action( 'woocommerce_new_order', function($order){

	if(class_exists('WOOMULTI_CURRENCY_F') 
		&& class_exists('Wbte_Woocommerce_Gift_Cards_Free_Common')
		&& method_exists('Wbte_Woocommerce_Gift_Cards_Free_Common','is_store_credit_coupon')
		&& function_exists('convert_curcy_price')	
	){
		$order = ! is_object($order) ? wc_get_order($order) : $order;
		$cart  = WC()->cart;

		if(empty($cart))
		{
			return;
		}

		$applied_coupons = $cart->get_applied_coupons();
		if(empty($applied_coupons))
		{
			return;
		}
	
		foreach($applied_coupons as $coupon_code)
		{
			$coupon = new WC_Coupon($coupon_code);
			$coupon_id = $coupon->get_id();

			if(!$coupon || !Wbte_Woocommerce_Gift_Cards_Free_Common::is_store_credit_coupon($coupon))
			{
				continue;
			}
			$coupon_amount = get_post_meta($coupon_id, 'coupon_amount', true);
			if(0 < $coupon_amount){
				$order_currency = $order->get_currency();
				$coupon_amount = convert_curcy_price($coupon_amount, get_option('woocommerce_currency'), $order_currency);
				$coupon->set_amount(wc_format_decimal($coupon_amount, 2));
				$coupon->save();
			}
		}
	}
}, 11, 1 );

// Newly created store credit coupon
add_action( 'woocommerce_new_order_item', function($item_id, $item, $order_id){
	
	if(class_exists('WOOMULTI_CURRENCY_F') 
		&& function_exists('convert_curcy_price')){

		$order = wc_get_order($order_id);
		$order_currency = $order->get_currency();
		$legacy_values = $item->legacy_values;

		if (!isset($legacy_values['wt_credit_amount']) || 0 >= floatval($legacy_values['wt_credit_amount'])) {
			return;
		}

		if(isset($legacy_values['wt_credit_currency']) && $legacy_values['wt_credit_currency'] !== get_option('woocommerce_currency')){
			
			$coupon_datas = wc_get_order_item_meta( $item_id, 'wt_credit_coupon_generated', true );
			foreach($coupon_datas as $coupon_data){
				$coupon_id = $coupon_data['coupon_id'];
				$coupon_amount = $coupon_data['credited_amount'];
				$coupon_obj = new WC_Coupon( $coupon_id );
				
				$coupon_updated_amount = convert_curcy_price($coupon_amount,$order_currency, $legacy_values['wt_credit_currency']);
				
				$coupon_obj->set_amount(wc_format_decimal($coupon_updated_amount,2));
				$coupon_obj->save();
			}
		}
	}
}, 999, 3 );

/**
 *  Convert currency in Order edit page , emails and PDFs according to order currency
 */
add_filter('wbte_gc_alter_prices_on_giftcard',function($price,$args){
	
	if(class_exists('WOOMULTI_CURRENCY_F') 
		&& method_exists('WOOMULTI_CURRENCY_F_Data','get_ins') 
		&& function_exists('convert_curcy_price')	
	){
		if( $args['order'] ){
			
			$order_currency = $args['order']->get_currency();

			$curcy_currency_settings = WOOMULTI_CURRENCY_F_Data::get_ins();
			$currency_list = $curcy_currency_settings->get_list_currencies(); //get list currency
			$order_currency_rate = floatval( $currency_list[ $order_currency ]['rate'] ); 
			if( $order_currency_rate ){
				$coupon_amount = get_post_meta( $args['coupon']->get_id(), 'coupon_amount' )[0];
				$amount = $coupon_amount * $order_currency_rate;
				return wc_price( $amount, array( 'currency' => $order_currency ) );
			}
		}
	}
	return $price;

}, 10, 2);