feat: podpora neplatících osob u objednávek

client/src/components/modals/PayForGroupModal.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from "react";
 import { Modal, Button, Form, Table, Alert } from "react-bootstrap";
 import { generateQr, OrderGroup, OrderGroupMember, QrRecipient } from "../../../../types";
 import { sanitizeQrMessage } from "../../Utils";
+import { computeFeeShare, computeMemberTotal, countActiveMembers, isActiveMember } from "../../utils/groupFees";
 
 type Props = {
     isOpen: boolean;
@@ -31,32 +32,25 @@ export default function PayForGroupModal({ isOpen, onClose, onSuccess, group, pa
         const entries: DinerEntry[] = (Object.entries(group.members) as [string, OrderGroupMember][]).map(([login, member]) => ({
             login,
             member,
-            included: login !== payerLogin,
+            // Standardně zahrnout všechny, kdo nejsou plátce a něco si objednali.
+            included: login !== payerLogin && isActiveMember(member),
         }));
         setDiners(entries);
         setError(null);
         setSuccess(false);
     }, [isOpen, group, payerLogin]);
 
-    const memberCount = diners.length;
     const fees = group.fees ?? 0;
     const shipping = group.shipping ?? 0;
     const tip = group.tip ?? 0;
     const totalFees = fees + shipping + tip;
-    const feeShare = memberCount > 0 ? Math.round(totalFees / memberCount) : 0;
+    // Poplatky se dělí jen mezi aktivní strávníky (kdo si reálně něco objednal).
+    const activeCount = countActiveMembers(group.members);
+    const feeShare = computeFeeShare(totalFees, activeCount);
+    const feeParams = { totalFees, discountType: group.discountType, discountValue: group.discountValue ?? 0 };
 
-    const getMemberTotal = (entry: DinerEntry): number => {
-        const base = entry.member.amount ?? 0;
-        const surcharge = entry.member.surchargeAmount ?? 0;
-        const discountType = group.discountType;
-        const discountValue = group.discountValue ?? 0;
-        const discount = discountValue > 0
-            ? (discountType === 'percent'
-                ? Math.round((base + surcharge) * discountValue / 100)
-                : Math.round(discountValue / memberCount))
-            : 0;
-        return base + surcharge + feeShare - discount;
-    };
+    const getMemberTotal = (entry: DinerEntry): number =>
+        computeMemberTotal(entry.member, feeParams, feeShare, activeCount);
 
     const includedNonPayers = diners.filter(d => d.included && d.login !== payerLogin);
 
@@ -157,13 +151,16 @@ export default function PayForGroupModal({ isOpen, onClose, onSuccess, group, pa
                             <tbody>
                                 {diners.map(d => {
                                     const isPayer = d.login === payerLogin;
+                                    const active = isActiveMember(d.member);
                                     const total = getMemberTotal(d);
                                     const surcharge = d.member.surchargeAmount ?? 0;
                                     return (
-                                        <tr key={d.login} className={!d.included && !isPayer ? 'text-muted' : ''}>
+                                        <tr key={d.login} className={(!d.included && !isPayer) || !active ? 'text-muted' : ''}>
                                             <td className="text-center">
                                                 {isPayer ? (
                                                     <small className="text-muted">plátce</small>
+                                                ) : !active ? (
+                                                    <small className="text-muted">jen objednává</small>
                                                 ) : (
                                                     <Form.Check
                                                         type="checkbox"
@@ -186,7 +183,7 @@ export default function PayForGroupModal({ isOpen, onClose, onSuccess, group, pa
                                             </td>
                                             {hasFees && (
                                                 <td className="text-end">
-                                                    {feeShare > 0 ? `${feeShare / 100} Kč` : '—'}
+                                                    {active && feeShare > 0 ? `${feeShare / 100} Kč` : '—'}
                                                 </td>
                                             )}
                                             <td className="text-end fw-bold">