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<?php

use Automattic\WooCommerce\Utilities\NumberUtil;
defined('ABSPATH') || exit;
class WC_Discounts
{
    protected $object;
    protected $items = array();
    protected $discounts = array();
    public function __construct($object = null)
    {
        if (is_a($object, 'WC_Cart')) {
            $this->set_items_from_cart($object);
        } elseif (is_a($object, 'WC_Order')) {
            $this->set_items_from_order($object);
        }
    }
    public function set_items($items)
    {
        $this->items = $items;
        $this->discounts = array();
        uasort($this->items, array($this, 'sort_by_price'));
    }
    public function set_items_from_cart($cart)
    {
        $this->items = array();
        $this->discounts = array();
        if (!is_a($cart, 'WC_Cart')) {
            return;
        }
        $this->object = $cart;
        foreach ($cart->get_cart() as $key => $cart_item) {
            $item = new stdClass();
            $item->key = $key;
            $item->object = $cart_item;
            $item->product = $cart_item['data'];
            $item->quantity = $cart_item['quantity'];
            $item->price = wc_add_number_precision_deep((float) $item->product->get_price() * (float) $item->quantity);
            $this->items[$key] = $item;
        }
        uasort($this->items, array($this, 'sort_by_price'));
    }
    public function set_items_from_order($order)
    {
        $this->items = array();
        $this->discounts = array();
        if (!is_a($order, 'WC_Order')) {
            return;
        }
        $this->object = $order;
        foreach ($order->get_items() as $order_item) {
            $item = new stdClass();
            $item->key = $order_item->get_id();
            $item->object = $order_item;
            $item->product = $order_item->get_product();
            $item->quantity = $order_item->get_quantity();
            $item->price = wc_add_number_precision_deep($order_item->get_subtotal());
            if ($order->get_prices_include_tax()) {
                $item->price += wc_add_number_precision_deep($order_item->get_subtotal_tax());
            }
            $this->items[$order_item->get_id()] = $item;
        }
        uasort($this->items, array($this, 'sort_by_price'));
    }
    public function get_object()
    {
        return $this->object;
    }
    public function get_items()
    {
        return $this->items;
    }
    public function get_items_to_validate()
    {
        return apply_filters('woocommerce_coupon_get_items_to_validate', $this->get_items(), $this);
    }
    public function get_discount($key, $in_cents = false)
    {
        $item_discount_totals = $this->get_discounts_by_item($in_cents);
        return isset($item_discount_totals[$key]) ? $item_discount_totals[$key] : 0;
    }
    public function get_discounts($in_cents = false)
    {
        $discounts = $this->discounts;
        return $in_cents ? $discounts : wc_remove_number_precision_deep($discounts);
    }
    public function get_discounts_by_item($in_cents = false)
    {
        $discounts = $this->discounts;
        $item_discount_totals = (array) array_shift($discounts);
        foreach ($discounts as $item_discounts) {
            foreach ($item_discounts as $item_key => $item_discount) {
                $item_discount_totals[$item_key] += $item_discount;
            }
        }
        return $in_cents ? $item_discount_totals : wc_remove_number_precision_deep($item_discount_totals);
    }
    public function get_discounts_by_coupon($in_cents = false)
    {
        $coupon_discount_totals = array_map('array_sum', $this->discounts);
        return $in_cents ? $coupon_discount_totals : wc_remove_number_precision_deep($coupon_discount_totals);
    }
    public function get_discounted_price($item)
    {
        return wc_remove_number_precision_deep($this->get_discounted_price_in_cents($item));
    }
    public function get_discounted_price_in_cents($item)
    {
        return absint(NumberUtil::round($item->price - $this->get_discount($item->key, true)));
    }
    public function apply_coupon($coupon, $validate = true)
    {
        if (!is_a($coupon, 'WC_Coupon')) {
            return new WP_Error('invalid_coupon', __('Invalid coupon', 'woocommerce'));
        }
        $is_coupon_valid = $validate ? $this->is_coupon_valid($coupon) : true;
        if (is_wp_error($is_coupon_valid)) {
            return $is_coupon_valid;
        }
        if (!isset($this->discounts[$coupon->get_code()])) {
            $this->discounts[$coupon->get_code()] = array_fill_keys(array_keys($this->items), 0);
        }
        $items_to_apply = $this->get_items_to_apply_coupon($coupon);
        switch ($coupon->get_discount_type()) {
            case 'percent':
                $this->apply_coupon_percent($coupon, $items_to_apply);
                break;
            case 'fixed_product':
                $this->apply_coupon_fixed_product($coupon, $items_to_apply);
                break;
            case 'fixed_cart':
                $this->apply_coupon_fixed_cart($coupon, $items_to_apply);
                break;
            default:
                $this->apply_coupon_custom($coupon, $items_to_apply);
                break;
        }
        return true;
    }
    protected function sort_by_price($a, $b)
    {
        $price_1 = $a->price * $a->quantity;
        $price_2 = $b->price * $b->quantity;
        if ($price_1 === $price_2) {
            return 0;
        }
        return $price_1 < $price_2 ? 1 : -1;
    }
    protected function filter_products_with_price($item)
    {
        return $this->get_discounted_price_in_cents($item) > 0;
    }
    protected function get_items_to_apply_coupon($coupon)
    {
        $items_to_apply = array();
        foreach ($this->get_items_to_validate() as $item) {
            $item_to_apply = clone $item;
            if (0 === $this->get_discounted_price_in_cents($item_to_apply) || 0 >= $item_to_apply->quantity) {
                continue;
            }
            if (!$coupon->is_valid_for_product($item_to_apply->product, $item_to_apply->object) && !$coupon->is_valid_for_cart()) {
                continue;
            }
            $items_to_apply[] = $item_to_apply;
        }
        return $items_to_apply;
    }
    protected function apply_coupon_percent($coupon, $items_to_apply)
    {
        $total_discount = 0;
        $cart_total = 0;
        $limit_usage_qty = 0;
        $applied_count = 0;
        $adjust_final_discount = true;
        if (null !== $coupon->get_limit_usage_to_x_items()) {
            $limit_usage_qty = $coupon->get_limit_usage_to_x_items();
        }
        $coupon_amount = $coupon->get_amount();
        foreach ($items_to_apply as $item) {
            $discounted_price = $this->get_discounted_price_in_cents($item);
            $price_to_discount = 'yes' === get_option('woocommerce_calc_discounts_sequentially', 'no') ? $discounted_price : NumberUtil::round($item->price);
            $apply_quantity = $limit_usage_qty && $limit_usage_qty - $applied_count < $item->quantity ? $limit_usage_qty - $applied_count : $item->quantity;
            $apply_quantity = max(0, apply_filters('woocommerce_coupon_get_apply_quantity', $apply_quantity, $item, $coupon, $this));
            $price_to_discount = $price_to_discount / $item->quantity * $apply_quantity;
            $discount = floor($price_to_discount * ($coupon_amount / 100));
            if (is_a($this->object, 'WC_Cart') && has_filter('woocommerce_coupon_get_discount_amount')) {
                $filtered_discount = wc_add_number_precision(apply_filters('woocommerce_coupon_get_discount_amount', wc_remove_number_precision($discount), wc_remove_number_precision($price_to_discount), $item->object, false, $coupon));
                if ($filtered_discount !== $discount) {
                    $discount = $filtered_discount;
                    $adjust_final_discount = false;
                }
            }
            $discount = wc_round_discount(min($discounted_price, $discount), 0);
            $cart_total = $cart_total + $price_to_discount;
            $total_discount = $total_discount + $discount;
            $applied_count = $applied_count + $apply_quantity;
            $this->discounts[$coupon->get_code()][$item->key] += $discount;
        }
        $cart_total_discount = wc_round_discount($cart_total * ($coupon_amount / 100), 0);
        if ($total_discount < $cart_total_discount && $adjust_final_discount) {
            $total_discount += $this->apply_coupon_remainder($coupon, $items_to_apply, $cart_total_discount - $total_discount);
        }
        return $total_discount;
    }
    protected function apply_coupon_fixed_product($coupon, $items_to_apply, $amount = null)
    {
        $total_discount = 0;
        $amount = $amount ? $amount : wc_add_number_precision($coupon->get_amount());
        $limit_usage_qty = 0;
        $applied_count = 0;
        if (null !== $coupon->get_limit_usage_to_x_items()) {
            $limit_usage_qty = $coupon->get_limit_usage_to_x_items();
        }
        foreach ($items_to_apply as $item) {
            $discounted_price = $this->get_discounted_price_in_cents($item);
            $price_to_discount = 'yes' === get_option('woocommerce_calc_discounts_sequentially', 'no') ? $discounted_price : $item->price;
            if ($limit_usage_qty) {
                $apply_quantity = $limit_usage_qty - $applied_count < $item->quantity ? $limit_usage_qty - $applied_count : $item->quantity;
                $apply_quantity = max(0, apply_filters('woocommerce_coupon_get_apply_quantity', $apply_quantity, $item, $coupon, $this));
                $discount = min($amount, $item->price / $item->quantity) * $apply_quantity;
            } else {
                $apply_quantity = apply_filters('woocommerce_coupon_get_apply_quantity', $item->quantity, $item, $coupon, $this);
                $discount = $amount * $apply_quantity;
            }
            if (is_a($this->object, 'WC_Cart') && has_filter('woocommerce_coupon_get_discount_amount')) {
                $discount = wc_add_number_precision(apply_filters('woocommerce_coupon_get_discount_amount', wc_remove_number_precision($discount), wc_remove_number_precision($price_to_discount), $item->object, false, $coupon));
            }
            $discount = min($discounted_price, $discount);
            $total_discount = $total_discount + $discount;
            $applied_count = $applied_count + $apply_quantity;
            $this->discounts[$coupon->get_code()][$item->key] += $discount;
        }
        return $total_discount;
    }
    protected function apply_coupon_fixed_cart($coupon, $items_to_apply, $amount = null)
    {
        $total_discount = 0;
        $amount = $amount ? $amount : wc_add_number_precision($coupon->get_amount());
        $items_to_apply = array_filter($items_to_apply, array($this, 'filter_products_with_price'));
        $item_count = array_sum(wp_list_pluck($items_to_apply, 'quantity'));
        if (!$item_count) {
            return $total_discount;
        }
        if (!$amount) {
            $total_discount = $this->apply_coupon_fixed_product($coupon, $items_to_apply, 0);
        } else {
            $per_item_discount = absint($amount / $item_count);
            if ($per_item_discount > 0) {
                $total_discount = $this->apply_coupon_fixed_product($coupon, $items_to_apply, $per_item_discount);
                if ($total_discount > 0 && $total_discount < $amount) {
                    $total_discount += $this->apply_coupon_fixed_cart($coupon, $items_to_apply, $amount - $total_discount);
                }
            } elseif ($amount > 0) {
                $total_discount += $this->apply_coupon_remainder($coupon, $items_to_apply, $amount);
            }
        }
        return $total_discount;
    }
    protected function apply_coupon_custom($coupon, $items_to_apply)
    {
        $limit_usage_qty = 0;
        $applied_count = 0;
        if (null !== $coupon->get_limit_usage_to_x_items()) {
            $limit_usage_qty = $coupon->get_limit_usage_to_x_items();
        }
        foreach ($items_to_apply as $item) {
            $discounted_price = $this->get_discounted_price_in_cents($item);
            $price_to_discount = wc_remove_number_precision('yes' === get_option('woocommerce_calc_discounts_sequentially', 'no') ? $discounted_price : $item->price);
            $apply_quantity = $limit_usage_qty && $limit_usage_qty - $applied_count < $item->quantity ? $limit_usage_qty - $applied_count : $item->quantity;
            $apply_quantity = max(0, apply_filters('woocommerce_coupon_get_apply_quantity', $apply_quantity, $item, $coupon, $this));
            $discount = wc_add_number_precision($coupon->get_discount_amount($price_to_discount / $item->quantity, $item->object, true)) * $apply_quantity;
            $discount = wc_round_discount(min($discounted_price, $discount), 0);
            $applied_count = $applied_count + $apply_quantity;
            $this->discounts[$coupon->get_code()][$item->key] += $discount;
        }
        $this->discounts[$coupon->get_code()] = apply_filters('woocommerce_coupon_custom_discounts_array', $this->discounts[$coupon->get_code()], $coupon);
        return array_sum($this->discounts[$coupon->get_code()]);
    }
    protected function apply_coupon_remainder($coupon, $items_to_apply, $amount)
    {
        $total_discount = 0;
        foreach ($items_to_apply as $item) {
            for ($i = 0; $i < $item->quantity; $i++) {
                $price_to_discount = $this->get_discounted_price_in_cents($item);
                $discount = min($price_to_discount, 1);
                $total_discount += $discount;
                $this->discounts[$coupon->get_code()][$item->key] += $discount;
                if ($total_discount >= $amount) {
                    break 2;
                }
            }
            if ($total_discount >= $amount) {
                break;
            }
        }
        return $total_discount;
    }
    protected function validate_coupon_exists($coupon)
    {
        if (!$coupon->get_id() && !$coupon->get_virtual()) {
            throw new Exception(sprintf(__('Coupon "%s" does not exist!', 'woocommerce'), esc_html($coupon->get_code())), 105);
        }
        return true;
    }
    protected function validate_coupon_usage_limit($coupon)
    {
        if (!$coupon->get_usage_limit()) {
            return true;
        }
        $usage_count = $coupon->get_usage_count();
        $data_store = $coupon->get_data_store();
        $tentative_usage_count = is_callable(array($data_store, 'get_tentative_usage_count')) ? $data_store->get_tentative_usage_count($coupon->get_id()) : 0;
        if ($usage_count + $tentative_usage_count < $coupon->get_usage_limit()) {
            return true;
        }
        if (0 === $tentative_usage_count) {
            $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_REACHED;
        } elseif (is_user_logged_in()) {
            $recent_pending_orders = wc_get_orders(array('limit' => 1, 'post_status' => array('wc-failed', 'wc-pending'), 'customer' => get_current_user_id(), 'return' => 'ids'));
            if (count($recent_pending_orders) > 0) {
                $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_COUPON_STUCK;
            } else {
                $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_REACHED;
            }
        } else {
            $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_COUPON_STUCK_GUEST;
        }
        throw new Exception($coupon->get_coupon_error($error_code), $error_code);
    }
    protected function validate_coupon_user_usage_limit($coupon, $user_id = 0)
    {
        if (empty($user_id)) {
            if ($this->object instanceof WC_Order) {
                $user_id = $this->object->get_customer_id();
            } else {
                $user_id = get_current_user_id();
            }
        }
        if ($coupon && $user_id && apply_filters('woocommerce_coupon_validate_user_usage_limit', $coupon->get_usage_limit_per_user() > 0, $user_id, $coupon, $this) && $coupon->get_id() && $coupon->get_data_store()) {
            $data_store = $coupon->get_data_store();
            $usage_count = $data_store->get_usage_by_user_id($coupon, $user_id);
            if ($usage_count >= $coupon->get_usage_limit_per_user()) {
                if ($data_store->get_tentative_usages_for_user($coupon->get_id(), array($user_id)) > 0) {
                    $error_message = $coupon->get_coupon_error(WC_Coupon::E_WC_COUPON_USAGE_LIMIT_COUPON_STUCK);
                    $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_COUPON_STUCK;
                } else {
                    $error_message = $coupon->get_coupon_error(WC_Coupon::E_WC_COUPON_USAGE_LIMIT_REACHED);
                    $error_code = WC_Coupon::E_WC_COUPON_USAGE_LIMIT_REACHED;
                }
                throw new Exception($error_message, $error_code);
            }
        }
        return true;
    }
    protected function validate_coupon_expiry_date($coupon)
    {
        if ($coupon->get_date_expires() && apply_filters('woocommerce_coupon_validate_expiry_date', time() > $coupon->get_date_expires()->getTimestamp(), $coupon, $this)) {
            throw new Exception(__('This coupon has expired.', 'woocommerce'), 107);
        }
        return true;
    }
    protected function validate_coupon_minimum_amount($coupon)
    {
        $subtotal = wc_remove_number_precision($this->get_object_subtotal());
        if ($coupon->get_minimum_amount() > 0 && apply_filters('woocommerce_coupon_validate_minimum_amount', $coupon->get_minimum_amount() > $subtotal, $coupon, $subtotal)) {
            throw new Exception(sprintf(__('The minimum spend for this coupon is %s.', 'woocommerce'), wc_price($coupon->get_minimum_amount())), 108);
        }
        return true;
    }
    protected function validate_coupon_maximum_amount($coupon)
    {
        $subtotal = wc_remove_number_precision($this->get_object_subtotal());
        if ($coupon->get_maximum_amount() > 0 && apply_filters('woocommerce_coupon_validate_maximum_amount', $coupon->get_maximum_amount() < $subtotal, $coupon)) {
            throw new Exception(sprintf(__('The maximum spend for this coupon is %s.', 'woocommerce'), wc_price($coupon->get_maximum_amount())), 112);
        }
        return true;
    }
    protected function validate_coupon_product_ids($coupon)
    {
        if (count($coupon->get_product_ids()) > 0) {
            $valid = false;
            foreach ($this->get_items_to_validate() as $item) {
                if ($item->product && in_array($item->product->get_id(), $coupon->get_product_ids(), true) || in_array($item->product->get_parent_id(), $coupon->get_product_ids(), true)) {
                    $valid = true;
                    break;
                }
            }
            if (!$valid) {
                throw new Exception(__('Sorry, this coupon is not applicable to selected products.', 'woocommerce'), 109);
            }
        }
        return true;
    }
    protected function validate_coupon_product_categories($coupon)
    {
        if (count($coupon->get_product_categories()) > 0) {
            $valid = false;
            foreach ($this->get_items_to_validate() as $item) {
                if ($coupon->get_exclude_sale_items() && $item->product && $item->product->is_on_sale()) {
                    continue;
                }
                $product_cats = wc_get_product_cat_ids($item->product->get_id());
                if ($item->product->get_parent_id()) {
                    $product_cats = array_merge($product_cats, wc_get_product_cat_ids($item->product->get_parent_id()));
                }
                if (count(array_intersect($product_cats, $coupon->get_product_categories())) > 0) {
                    $valid = true;
                    break;
                }
            }
            if (!$valid) {
                throw new Exception(__('Sorry, this coupon is not applicable to selected products.', 'woocommerce'), 109);
            }
        }
        return true;
    }
    protected function validate_coupon_sale_items($coupon)
    {
        if ($coupon->get_exclude_sale_items()) {
            $valid = true;
            foreach ($this->get_items_to_validate() as $item) {
                if ($item->product && $item->product->is_on_sale()) {
                    $valid = false;
                    break;
                }
            }
            if (!$valid) {
                throw new Exception(__('Sorry, this coupon is not valid for sale items.', 'woocommerce'), 110);
            }
        }
        return true;
    }
    protected function validate_coupon_excluded_items($coupon)
    {
        $items = $this->get_items_to_validate();
        if (!empty($items) && $coupon->is_type(wc_get_product_coupon_types())) {
            $valid = false;
            foreach ($items as $item) {
                if ($item->product && $coupon->is_valid_for_product($item->product, $item->object)) {
                    $valid = true;
                    break;
                }
            }
            if (!$valid) {
                throw new Exception(__('Sorry, this coupon is not applicable to selected products.', 'woocommerce'), 109);
            }
        }
        return true;
    }
    protected function validate_coupon_eligible_items($coupon)
    {
        if (!$coupon->is_type(wc_get_product_coupon_types())) {
            $this->validate_coupon_sale_items($coupon);
            $this->validate_coupon_excluded_product_ids($coupon);
            $this->validate_coupon_excluded_product_categories($coupon);
        }
        return true;
    }
    protected function validate_coupon_excluded_product_ids($coupon)
    {
        if (count($coupon->get_excluded_product_ids()) > 0) {
            $products = array();
            foreach ($this->get_items_to_validate() as $item) {
                if ($item->product && in_array($item->product->get_id(), $coupon->get_excluded_product_ids(), true) || in_array($item->product->get_parent_id(), $coupon->get_excluded_product_ids(), true)) {
                    $products[] = $item->product->get_name();
                }
            }
            if (!empty($products)) {
                throw new Exception(sprintf(__('Sorry, this coupon is not applicable to the products: %s.', 'woocommerce'), implode(', ', $products)), 113);
            }
        }
        return true;
    }
    protected function validate_coupon_excluded_product_categories($coupon)
    {
        if (count($coupon->get_excluded_product_categories()) > 0) {
            $categories = array();
            foreach ($this->get_items_to_validate() as $item) {
                if (!$item->product) {
                    continue;
                }
                $product_cats = wc_get_product_cat_ids($item->product->get_id());
                if ($item->product->get_parent_id()) {
                    $product_cats = array_merge($product_cats, wc_get_product_cat_ids($item->product->get_parent_id()));
                }
                $cat_id_list = array_intersect($product_cats, $coupon->get_excluded_product_categories());
                if (count($cat_id_list) > 0) {
                    foreach ($cat_id_list as $cat_id) {
                        $cat = get_term($cat_id, 'product_cat');
                        $categories[] = $cat->name;
                    }
                }
            }
            if (!empty($categories)) {
                throw new Exception(sprintf(__('Sorry, this coupon is not applicable to the categories: %s.', 'woocommerce'), implode(', ', array_unique($categories))), 114);
            }
        }
        return true;
    }
    protected function get_object_subtotal()
    {
        if (is_a($this->object, 'WC_Cart')) {
            return wc_add_number_precision($this->object->get_displayed_subtotal());
        } elseif (is_a($this->object, 'WC_Order')) {
            $subtotal = wc_add_number_precision($this->object->get_subtotal());
            if ($this->object->get_prices_include_tax()) {
                $subtotal = $subtotal + wc_add_number_precision(NumberUtil::round($this->object->get_total_tax(), wc_get_price_decimals()));
            }
            return $subtotal;
        } else {
            return array_sum(wp_list_pluck($this->items, 'price'));
        }
    }
    public function is_coupon_valid($coupon)
    {
        try {
            $this->validate_coupon_exists($coupon);
            $this->validate_coupon_usage_limit($coupon);
            $this->validate_coupon_user_usage_limit($coupon);
            $this->validate_coupon_expiry_date($coupon);
            $this->validate_coupon_minimum_amount($coupon);
            $this->validate_coupon_maximum_amount($coupon);
            $this->validate_coupon_product_ids($coupon);
            $this->validate_coupon_product_categories($coupon);
            $this->validate_coupon_excluded_items($coupon);
            $this->validate_coupon_eligible_items($coupon);
            if (!apply_filters('woocommerce_coupon_is_valid', true, $coupon, $this)) {
                throw new Exception(__('Coupon is not valid.', 'woocommerce'), 100);
            }
        } catch (Exception $e) {
            $message = apply_filters('woocommerce_coupon_error', is_numeric($e->getMessage()) ? $coupon->get_coupon_error($e->getMessage()) : $e->getMessage(), $e->getCode(), $coupon);
            return new WP_Error('invalid_coupon', $message, array('status' => 400));
        }
        return true;
    }
}