function calculate_tax_deduction($amount, $od_amount, $method)
{
global $customer_id, $order, $cc_id, $cart;
$coupon_query = smn_db_query("select coupon_code from " . TABLE_COUPONS . " where coupon_id = '" . $cc_id . "'");
if (smn_db_num_rows($coupon_query) != 0) {
$coupon_result = smn_db_fetch_array($coupon_query);
$coupon_get = smn_db_query("select coupon_amount, coupon_minimum_order, restrict_to_products, restrict_to_categories, coupon_type from " . TABLE_COUPONS . " where coupon_code = '" . $coupon_result['coupon_code'] . "'");
$get_result = smn_db_fetch_array($coupon_get);
if ($get_result['coupon_type'] != 'S') {
//RESTRICTION--------------------------------
if ($get_result['restrict_to_products'] || $get_result['restrict_to_categories']) {
// What to do here.
// Loop through all products and build a list of all product_ids, price, tax class
// at the same time create total net amount.
// then
// for percentage discounts. simply reduce tax group per product by discount percentage
// or
// for fixed payment amount
// calculate ratio based on total net
// for each product reduce tax group per product by ratio amount.
$products = $cart->get_products();
$valid_product = false;
for ($i = 0; $i < sizeof($products); $i++) {
$valid_product = false;
$t_prid = smn_get_prid($products[$i]['id']);
$cc_query = smn_db_query("select products_tax_class_id from " . TABLE_PRODUCTS . " where products_id = '" . $t_prid . "'");
$cc_result = smn_db_fetch_array($cc_query);
if ($get_result['restrict_to_products']) {
$pr_ids = split("[,]", $get_result['restrict_to_products']);
for ($p = 0; $p < sizeof($pr_ids); $p++) {
if ($pr_ids[$p] == $t_prid) {
$valid_product = true;
}
}
}
if ($get_result['restrict_to_categories']) {
$cat_ids = split("[,]", $get_result['restrict_to_categories']);
$my_path = smn_get_product_path($t_prid);
$sub_cat_ids = split("[_]", $my_path);
for ($iii = 0; $iii < count($sub_cat_ids); $iii++) {
for ($ii = 0; $ii < count($cat_ids); $ii++) {
if ($sub_cat_ids[$iii] == $cat_ids[$ii]) {
$valid_product = true;
continue 2;
}
}
}
}
if ($valid_product) {
$price_excl_vat = $products[$i]['final_price'] * $products[$i]['quantity'];
$price_incl_vat = $this->product_price($t_prid);
$valid_array[] = array('product_id' => $t_prid, 'products_price' => $price_excl_vat, 'products_tax_class' => $cc_result['products_tax_class_id']);
$total_price += $price_excl_vat;
}
}
if (sizeof($valid_array) > 0) {
if ($get_result['coupon_type'] == 'P') {
$ratio = $get_result['coupon_amount'] / 100;
} else {
$ratio = $od_amount / $total_price;
}
if ($get_result['coupon_type'] == 'S') {
$ratio = 1;
}
if ($method == 'Credit Note') {
$tax_rate = smn_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tax_desc = smn_get_tax_description($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
if ($get_result['coupon_type'] == 'P') {
$tod_amount = $od_amount / (100 + $tax_rate) * $tax_rate;
} else {
$tod_amount = $order->info['tax_groups'][$tax_desc] * $od_amount / 100;
}
$order->info['tax_groups'][$tax_desc] -= $tod_amount;
$order->info['total'] -= $tod_amount;
$order->info['tax'] -= $tod_amount;
} else {
for ($p = 0; $p < sizeof($valid_array); $p++) {
$tax_rate = smn_get_tax_rate($valid_array[$p]['products_tax_class'], $order->delivery['country']['id'], $order->delivery['zone_id']);
$tax_desc = smn_get_tax_description($valid_array[$p]['products_tax_class'], $order->delivery['country']['id'], $order->delivery['zone_id']);
if ($tax_rate > 0) {
$tod_amount = $valid_array[$p]['products_price'] * $tax_rate / 100 * $ratio;
$order->info['tax_groups'][$tax_desc] -= $valid_array[$p]['products_price'] * $tax_rate / 100 * $ratio;
$order->info['total'] -= $valid_array[$p]['products_price'] * $tax_rate / 100 * $ratio;
$order->info['tax'] -= $valid_array[$p]['products_price'] * $tax_rate / 100 * $ratio;
}
}
}
}
//NO RESTRICTION--------------------------------
} else {
if ($get_result['coupon_type'] == 'F') {
$tod_amount = 0;
if ($method == 'Credit Note') {
$tax_rate = smn_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tax_desc = smn_get_tax_description($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tod_amount = $od_amount / (100 + $tax_rate) * $tax_rate;
$order->info['tax_groups'][$tax_desc] -= $tod_amount;
} else {
reset($order->info['tax_groups']);
while (list($key, $value) = each($order->info['tax_groups'])) {
$ratio1 = $od_amount / ($amount - $order->info['tax_groups'][$key]);
$tax_rate = smn_get_tax_rate_from_desc($key);
$net = $tax_rate * $order->info['tax_groups'][$key];
if ($net > 0) {
$god_amount = $order->info['tax_groups'][$key] * $ratio1;
$tod_amount += $god_amount;
$order->info['tax_groups'][$key] = $order->info['tax_groups'][$key] - $god_amount;
}
}
}
$order->info['total'] -= $tod_amount;
$order->info['tax'] -= $tod_amount;
}
if ($get_result['coupon_type'] == 'P') {
$tod_amount = 0;
if ($method == 'Credit Note') {
$tax_desc = smn_get_tax_description($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tod_amount = $order->info['tax_groups'][$tax_desc] * $od_amount / 100;
$order->info['tax_groups'][$tax_desc] -= $tod_amount;
} else {
reset($order->info['tax_groups']);
while (list($key, $value) = each($order->info['tax_groups'])) {
$god_amount = 0;
$tax_rate = smn_get_tax_rate_from_desc($key);
$net = $tax_rate * $order->info['tax_groups'][$key];
if ($net > 0) {
$god_amount = $order->info['tax_groups'][$key] * $get_result['coupon_amount'] / 100;
$tod_amount += $god_amount;
$order->info['tax_groups'][$key] = $order->info['tax_groups'][$key] - $god_amount;
}
}
}
$order->info['total'] -= $tod_amount;
// have to modify total also
$order->info['tax'] -= $tod_amount;
}
}
}
}
return $tod_amount;
}
function calculate_tax_deduction($amount, $od_amount, $method)
{
global $order;
switch ($method) {
case 'Standard':
$ratio1 = $amount == 0 ? 0 : smn_round($od_amount / $amount, 2);
$tod_amount = 0;
reset($order->info['tax_groups']);
while (list($key, $value) = each($order->info['tax_groups'])) {
$tax_rate = smn_get_tax_rate_from_desc($key);
$total_net += $tax_rate * $order->info['tax_groups'][$key];
}
if ($od_amount > $total_net) {
$od_amount = $total_net;
}
reset($order->info['tax_groups']);
while (list($key, $value) = each($order->info['tax_groups'])) {
$tax_rate = smn_get_tax_rate_from_desc($key);
$net = $tax_rate * $order->info['tax_groups'][$key];
if ($net > 0) {
$god_amount = $order->info['tax_groups'][$key] * $ratio1;
$tod_amount += $god_amount;
$order->info['tax_groups'][$key] = $order->info['tax_groups'][$key] - $god_amount;
}
}
$order->info['tax'] -= $tod_amount;
$order->info['total'] -= $tod_amount;
break;
case 'Credit Note':
$tax_rate = smn_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tax_desc = smn_get_tax_description($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
$tod_amount = $this->deduction / (100 + $tax_rate) * $tax_rate;
$order->info['tax_groups'][$tax_desc] -= $tod_amount;
break;
default:
}
return $tod_amount;
}
