Auto apply rank rewards

functions.php

<?php

// 1. Auto 10% discount for users in a specific rank (e.g. Silver or higher)
add_action('woocommerce_cart_calculate_fees', function ($cart) {
	if (is_admin() && !defined('DOING_AJAX')) return;
	$user_id = get_current_user_id();
	if (!$user_id || !class_exists('WPGL_Ranks_Core')) return;

	$rank_slug_or_id = 'silver'; // slug or rank ID; true = this rank or higher
	if (!WPGL_Ranks_Core::check_user_rank($user_id, $rank_slug_or_id, true)) return;

	$user_rank = WPGL_Ranks_Core::get_user_rank($user_id);
	$subtotal = (float) $cart->get_subtotal();
	if ($subtotal <= 0) return;

	$percent = 10;
	$discount_amount = -1 * round($subtotal * ($percent / 100), wc_get_price_decimals());
	$rank_name = $user_rank && isset($user_rank->name) ? $user_rank->name : 'Member';
	$cart->add_fee(sprintf('%1$s discount (%2$d%%)', $rank_name, $percent), $discount_amount, true);
});



// 2. Auto-apply rank reward coupons (discount/shipping from rank rewards)
add_action('woocommerce_before_cart', 'wpgl_auto_apply_rank_reward_coupons');
add_action('woocommerce_before_checkout_form', 'wpgl_auto_apply_rank_reward_coupons');
add_action('woocommerce_add_to_cart', 'wpgl_auto_apply_rank_reward_coupons');
add_action('woocommerce_cart_loaded_from_session', 'wpgl_auto_apply_rank_reward_coupons');

function wpgl_auto_apply_rank_reward_coupons() {
	if (!function_exists('WC') || !WC()->cart || WC()->cart->cart_contents_count < 1) return;
	$user_id = get_current_user_id();
	if (!$user_id || !class_exists('WPGL_Ranks_Database')) return;

	$claimed = WPGL_Ranks_Database::get_user_claimed_rewards($user_id);
	if (empty($claimed)) return;

	$coupon_codes = [];
	foreach ($claimed as $row) {
		$data = isset($row->reward_data) ? json_decode($row->reward_data, true) : [];
		if (!is_array($data)) continue;
		$type = isset($data['type']) ? $data['type'] : '';
		if ($type !== 'discount' && $type !== 'shipping') continue;
		if (!empty($data['coupon_code'])) $coupon_codes[] = $data['coupon_code'];
	}
	if (empty($coupon_codes)) return;

	$applied = WC()->cart->get_applied_coupons();
	foreach ($coupon_codes as $code) {
		if (in_array($code, $applied, true)) return;
		$coupon = new WC_Coupon($code);
		if ($coupon->get_id() && wpgl_is_coupon_valid_for_cart($coupon)) {
			WC()->cart->add_discount($code);
			return;
		}
	}
}

function wpgl_is_coupon_valid_for_cart($coupon) {
	if (!$coupon->get_id()) return false;
	if ($coupon->get_date_expires() && $coupon->get_date_expires()->getTimestamp() < time()) return false;
	$user_id = get_current_user_id();
	if ($user_id) {
		$limit = $coupon->get_usage_limit();
		if ($limit > 0 && $coupon->get_usage_count() >= $limit) return false;
		$limit_per_user = $coupon->get_usage_limit_per_user();
		if ($limit_per_user !== null && $limit_per_user > 0) {
			$used_by = $coupon->get_used_by();
			$n = 0;
			foreach ($used_by as $uid) { if ((int) $uid === $user_id) $n++; }
			if ($n >= $limit_per_user) return false;
		}
		$emails = $coupon->get_email_restrictions();
		if (!empty($emails)) {
			$user = get_userdata($user_id);
			if ($user && !in_array($user->user_email, $emails, true)) return false;
		}
	}
	return true;
}