FEAT-3: Zuchtpaar-Übersicht tab (derive pairs from litters) + ?vater/&mutter pair prefill in Probeverpaarung

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

gerbil-manager-web/src/pages/GenetikPage.tsx

@@ -16,20 +16,34 @@ export default function GenetikPage() {
   const [father, setFather] = useState<ParentValue>(EMPTY_PARENT)
   const [mother, setMother] = useState<ParentValue>(EMPTY_PARENT)
 
-  // Pre-fill a parent when arriving from an animal's detail page (?parent=<id>).
-  // Gender decides the side: female -> Mutter, otherwise Vater.
+  // Pre-fill parents from query params:
+  //  ?parent=<id>          single animal from its detail page (gender picks side)
+  //  ?vater=<id>&mutter=<id>  a whole pair, e.g. from the Zuchtpaar overview
   const [searchParams] = useSearchParams()
   const parentId = searchParams.get('parent')
-  const prefill = useApi(
-    () => (parentId ? getGerbil(parentId) : Promise.resolve(null)),
-    [parentId],
-  )
-  const [prefilledFor, setPrefilledFor] = useState<string | null>(null)
-  if (prefill.data && prefilledFor !== prefill.data.id) {
-    setPrefilledFor(prefill.data.id)
-    const value: ParentValue = { genotype: prefill.data.genotype ?? '', animalName: prefill.data.name }
-    if (prefill.data.gender === 'female') setMother(value)
-    else setFather(value)
+  const vaterId = searchParams.get('vater')
+  const mutterId = searchParams.get('mutter')
+
+  const prefill = useApi(() => (parentId ? getGerbil(parentId) : Promise.resolve(null)), [parentId])
+  const prefillVater = useApi(() => (vaterId ? getGerbil(vaterId) : Promise.resolve(null)), [vaterId])
+  const prefillMutter = useApi(() => (mutterId ? getGerbil(mutterId) : Promise.resolve(null)), [mutterId])
+
+  const [prefilledKey, setPrefilledKey] = useState<string | null>(null)
+  const prefillKey = `${parentId ?? ''}|${vaterId ?? ''}|${mutterId ?? ''}`
+  const allReady =
+    (!parentId || prefill.data) && (!vaterId || prefillVater.data) && (!mutterId || prefillMutter.data)
+  if (prefillKey !== '||' && allReady && prefilledKey !== prefillKey) {
+    setPrefilledKey(prefillKey)
+    const toValue = (g: { genotype: string | null; name: string }): ParentValue => ({
+      genotype: g.genotype ?? '',
+      animalName: g.name,
+    })
+    if (prefillVater.data) setFather(toValue(prefillVater.data))
+    if (prefillMutter.data) setMother(toValue(prefillMutter.data))
+    if (prefill.data) {
+      if (prefill.data.gender === 'female') setMother(toValue(prefill.data))
+      else setFather(toValue(prefill.data))
+    }
   }
 
   const bothValid = isValidGenotype(father.genotype) && isValidGenotype(mother.genotype)

gerbil-manager-web/src/pages/WuerfeListPage.tsx

@@ -4,37 +4,62 @@ import { de } from '../strings/de'
 import { listLitters } from '../api/litters'
 import { listGerbils } from '../api/gerbils'
 import { andFilter, condition, type GridifyQuery } from '../api/gridify'
+import type { Litter } from '../api/types'
 import { useApi } from '../hooks/useApi'
 import { formatDate } from '../format/labels'
 
 const PAGE_SIZE = 20
 
+type Tab = 'litters' | 'pairs'
 type SortKey = 'dateDesc' | 'dateAsc'
-const SORT_ORDER_BY: Record<SortKey, string> = {
-  dateDesc: 'date desc',
-  dateAsc: 'date',
-}
+const SORT_ORDER_BY: Record<SortKey, string> = { dateDesc: 'date desc', dateAsc: 'date' }
 
-/** Years offered in the filter: current year back through 15 years. */
 function yearOptions(): number[] {
   const current = new Date().getFullYear()
   return Array.from({ length: 16 }, (_, i) => current - i)
 }
 
+interface Pair {
+  fatherId: string
+  motherId: string
+  count: number
+  lastDate: string
+}
+
+/** Group litters (with both parents known) by (father, mother). */
+function derivePairs(litters: Litter[]): Pair[] {
+  const map = new Map<string, Pair>()
+  for (const l of litters) {
+    if (!l.fatherId || !l.motherId) continue
+    const key = `${l.fatherId}|${l.motherId}`
+    const existing = map.get(key)
+    if (existing) {
+      existing.count += 1
+      if (l.date > existing.lastDate) existing.lastDate = l.date
+    } else {
+      map.set(key, { fatherId: l.fatherId, motherId: l.motherId, count: 1, lastDate: l.date })
+    }
+  }
+  return Array.from(map.values()).sort((a, b) => b.lastDate.localeCompare(a.lastDate))
+}
+
 export default function WuerfeListPage() {
   const t = de.pages.litters
+  const [tab, setTab] = useState<Tab>('litters')
   const [year, setYear] = useState('')
   const [sort, setSort] = useState<SortKey>('dateDesc')
   const [page, setPage] = useState(1)
 
-  // Resolve parent names for the list rows.
+  // Parent names (shared by both tabs).
   const gerbils = useApi(() => listGerbils({ page: 1, pageSize: 1000, orderBy: 'name' }), [])
   const nameById = useMemo(() => {
     const map = new Map<string, string>()
     for (const g of gerbils.data?.items ?? []) map.set(g.id, g.name)
     return map
   }, [gerbils.data])
+  const parentName = (id: string | null) => (id ? (nameById.get(id) ?? t.detail.unknownParent) : '—')
 
+  // Litters tab (paged, filtered).
   const filter = andFilter(
     year && condition({ field: 'date', op: '>=', value: `${year}-01-01` }),
     year && condition({ field: 'date', op: '<=', value: `${year}-12-31` }),
@@ -43,109 +68,159 @@ export default function WuerfeListPage() {
   const query: GridifyQuery = { filter: filter || undefined, orderBy, page, pageSize: PAGE_SIZE }
   const litters = useApi(() => listLitters(query), [filter, orderBy, page])
 
+  // Pairs tab: all litters, grouped client-side.
+  const allLitters = useApi(
+    () => (tab === 'pairs' ? listLitters({ page: 1, pageSize: 1000, orderBy: 'date desc' }) : Promise.resolve(null)),
+    [tab],
+  )
+  const pairs = useMemo(() => derivePairs(allLitters.data?.items ?? []), [allLitters.data])
+
   const total = litters.data?.totalCount ?? 0
   const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
   const items = litters.data?.items ?? []
-  const parentName = (id: string | null) => (id ? (nameById.get(id) ?? t.detail.unknownParent) : '—')
 
   return (
     <section className="page">
       <header className="page-head">
-        <div>
-          <h2>{t.title}</h2>
-          {litters.data && (
-            <p className="muted">
-              {total} {t.countLabel}
-            </p>
-          )}
-        </div>
+        <h2>{t.title}</h2>
         <Link to="/wuerfe/neu" className="btn btn--primary">
           + {t.newButton}
         </Link>
       </header>
 
-      <div className="filters">
-        <label className="field">
-          <span>{t.filterYear}</span>
-          <select
-            value={year}
-            onChange={(e) => {
-              setYear(e.target.value)
-              setPage(1)
-            }}
-          >
-            <option value="">{t.allYears}</option>
-            {yearOptions().map((y) => (
-              <option key={y} value={y}>
-                {y}
-              </option>
-            ))}
-          </select>
-        </label>
-        <label className="field">
-          <span>{de.pages.gerbils.filters.sortBy}</span>
-          <select value={sort} onChange={(e) => setSort(e.target.value as SortKey)}>
-            <option value="dateDesc">{t.sort.dateDesc}</option>
-            <option value="dateAsc">{t.sort.dateAsc}</option>
-          </select>
-        </label>
+      <div className="tabs" role="tablist">
+        <button
+          type="button"
+          role="tab"
+          aria-selected={tab === 'litters'}
+          className={tab === 'litters' ? 'tab tab--active' : 'tab'}
+          onClick={() => setTab('litters')}
+        >
+          {t.tabs.litters}
+        </button>
+        <button
+          type="button"
+          role="tab"
+          aria-selected={tab === 'pairs'}
+          className={tab === 'pairs' ? 'tab tab--active' : 'tab'}
+          onClick={() => setTab('pairs')}
+        >
+          {t.tabs.pairs}
+        </button>
       </div>
 
-      {litters.loading && <p className="muted">{de.common.loading}</p>}
-      {litters.error && (
-        <div className="alert alert--error">
-          <span>{litters.error}</span>
-          <button type="button" className="btn" onClick={litters.reload}>
-            {de.common.retry}
-          </button>
-        </div>
+      {tab === 'litters' && (
+        <>
+          <div className="filters">
+            <label className="field">
+              <span>{t.filterYear}</span>
+              <select
+                value={year}
+                onChange={(e) => {
+                  setYear(e.target.value)
+                  setPage(1)
+                }}
+              >
+                <option value="">{t.allYears}</option>
+                {yearOptions().map((y) => (
+                  <option key={y} value={y}>
+                    {y}
+                  </option>
+                ))}
+              </select>
+            </label>
+            <label className="field">
+              <span>{de.pages.gerbils.filters.sortBy}</span>
+              <select value={sort} onChange={(e) => setSort(e.target.value as SortKey)}>
+                <option value="dateDesc">{t.sort.dateDesc}</option>
+                <option value="dateAsc">{t.sort.dateAsc}</option>
+              </select>
+            </label>
+          </div>
+
+          {litters.loading && <p className="muted">{de.common.loading}</p>}
+          {litters.error && (
+            <div className="alert alert--error">
+              <span>{litters.error}</span>
+              <button type="button" className="btn" onClick={litters.reload}>
+                {de.common.retry}
+              </button>
+            </div>
+          )}
+          {!litters.loading && !litters.error && items.length === 0 && (
+            <p className="muted">{t.empty}</p>
+          )}
+
+          {items.length > 0 && (
+            <ul className="card-list">
+              {items.map((l) => (
+                <li key={l.id}>
+                  <Link to={`/wuerfe/${l.id}`} className="gerbil-card">
+                    <span className="gerbil-card__name">{l.name}</span>
+                    <span className="gerbil-card__meta">{formatDate(l.date)}</span>
+                    <span className="gerbil-card__meta">
+                      {parentName(l.fatherId)} × {parentName(l.motherId)}
+                    </span>
+                    <span className="gerbil-card__meta">
+                      {l.totalBorn != null ? `${l.totalBorn} ${t.fields.totalBorn}` : '—'}
+                    </span>
+                  </Link>
+                </li>
+              ))}
+            </ul>
+          )}
+
+          {totalPages > 1 && (
+            <nav className="pager" aria-label="Seitennavigation">
+              <button
+                type="button"
+                className="btn"
+                disabled={page <= 1}
+                onClick={() => setPage((p) => Math.max(1, p - 1))}
+              >
+                {de.common.previous}
+              </button>
+              <span className="muted">
+                {de.common.page} {page} {de.common.of} {totalPages}
+              </span>
+              <button
+                type="button"
+                className="btn"
+                disabled={page >= totalPages}
+                onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
+              >
+                {de.common.next}
+              </button>
+            </nav>
+          )}
+        </>
       )}
 
-      {!litters.loading && !litters.error && items.length === 0 && (
-        <p className="muted">{t.empty}</p>
-      )}
-
-      {items.length > 0 && (
-        <ul className="card-list">
-          {items.map((l) => (
-            <li key={l.id}>
-              <Link to={`/wuerfe/${l.id}`} className="gerbil-card">
-                <span className="gerbil-card__name">{l.name}</span>
-                <span className="gerbil-card__meta">{formatDate(l.date)}</span>
-                <span className="gerbil-card__meta">
-                  {parentName(l.fatherId)} × {parentName(l.motherId)}
-                </span>
-                <span className="gerbil-card__meta">
-                  {l.totalBorn != null ? `${l.totalBorn} ${t.fields.totalBorn}` : '—'}
-                </span>
-              </Link>
-            </li>
-          ))}
-        </ul>
-      )}
-
-      {totalPages > 1 && (
-        <nav className="pager" aria-label="Seitennavigation">
-          <button
-            type="button"
-            className="btn"
-            disabled={page <= 1}
-            onClick={() => setPage((p) => Math.max(1, p - 1))}
-          >
-            {de.common.previous}
-          </button>
-          <span className="muted">
-            {de.common.page} {page} {de.common.of} {totalPages}
-          </span>
-          <button
-            type="button"
-            className="btn"
-            disabled={page >= totalPages}
-            onClick={() => setPage((p) => Math.min(totalPages, p + 1))}
-          >
-            {de.common.next}
-          </button>
-        </nav>
+      {tab === 'pairs' && (
+        <>
+          {allLitters.loading && <p className="muted">{de.common.loading}</p>}
+          {!allLitters.loading && pairs.length === 0 && <p className="muted">{t.pairs.empty}</p>}
+          {pairs.length > 0 && (
+            <ul className="card-list">
+              {pairs.map((p) => (
+                <li key={`${p.fatherId}|${p.motherId}`} className="gerbil-card">
+                  <span className="gerbil-card__name">
+                    {parentName(p.fatherId)} × {parentName(p.motherId)}
+                  </span>
+                  <span className="gerbil-card__meta">
+                    {p.count} {t.pairs.litterCount}
+                  </span>
+                  <span className="gerbil-card__meta">
+                    {t.pairs.lastLitter}: {formatDate(p.lastDate)}
+                  </span>
+                  <Link to={`/genetik?vater=${p.fatherId}&mutter=${p.motherId}`} className="link-btn">
+                    {t.pairs.testMating}
+                  </Link>
+                </li>
+              ))}
+            </ul>
+          )}
+        </>
       )}
     </section>
   )