From 79f260d62e309219defb5e0a21b0a3b3ede0a135 Mon Sep 17 00:00:00 2001
From: Gulum <gulum@rismer.de>
Date: Sat, 6 Jun 2026 00:31:19 +0200
Subject: [PATCH] FEAT-3: Wurf detail workspace (parents, juveniles, Jungtier
 erfassen prefill, expected Farbschlag via breed)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .../src/pages/GerbilFormPage.tsx              |  18 ++-
 .../src/pages/WurfDetailPage.tsx              | 133 +++++++++++++++++-
 2 files changed, 148 insertions(+), 3 deletions(-)

diff --git a/gerbil-manager-web/src/pages/GerbilFormPage.tsx b/gerbil-manager-web/src/pages/GerbilFormPage.tsx
index 7356c86..4bb3b27 100644
--- a/gerbil-manager-web/src/pages/GerbilFormPage.tsx
+++ b/gerbil-manager-web/src/pages/GerbilFormPage.tsx
@@ -1,5 +1,5 @@
 import { useState, type FormEvent } from 'react'
-import { Link, useNavigate, useParams } from 'react-router-dom'
+import { Link, useNavigate, useParams, useSearchParams } from 'react-router-dom'
 import { de } from '../strings/de'
 import { createGerbil, getGerbil, updateGerbil } from '../api/gerbils'
 import { listColorVarieties, listContacts, listEnclosures, listLitters } from '../api/lookups'
@@ -112,6 +112,22 @@ export default function GerbilFormPage() {
     setForm(formFromGerbil(existing.data))
   }
 
+  // Create-mode prefill from query params (?litterId, ?dob) — used by the Wurf
+  // workspace's "Jungtier erfassen" action to register a pup in one tap.
+  const [searchParams] = useSearchParams()
+  if (!isEdit && initializedFor === null) {
+    const litterId = searchParams.get('litterId')
+    const dob = searchParams.get('dob')
+    if (litterId || dob) {
+      setInitializedFor('new')
+      setForm((f) => ({
+        ...f,
+        litterId: litterId ?? f.litterId,
+        dateOfBirth: dob ?? f.dateOfBirth,
+      }))
+    }
+  }
+
   const set = <K extends keyof FormState>(key: K, value: FormState[K]) =>
     setForm((f) => ({ ...f, [key]: value }))
 
diff --git a/gerbil-manager-web/src/pages/WurfDetailPage.tsx b/gerbil-manager-web/src/pages/WurfDetailPage.tsx
index 0da05ca..5ecd556 100644
--- a/gerbil-manager-web/src/pages/WurfDetailPage.tsx
+++ b/gerbil-manager-web/src/pages/WurfDetailPage.tsx
@@ -1,10 +1,139 @@
+import { useMemo } from 'react'
+import { Link, useParams } from 'react-router-dom'
 import { de } from '../strings/de'
+import { getLitter } from '../api/litters'
+import { getGerbil, listGerbils } from '../api/gerbils'
+import { condition } from '../api/gridify'
+import { useApi } from '../hooks/useApi'
+import { formatDate } from '../format/labels'
+import { isValidGenotype } from '../format/genotypeText'
+import { breed, fromDisplayString, type BreedingResult } from '../genetics'
+import BreedingResultView from '../components/BreedingResultView'
 
 export default function WurfDetailPage() {
-  // Fleshed out in a later FEAT-3 increment (litter workspace + Jungtier erfassen).
+  const t = de.pages.litters
+  const { id = '' } = useParams()
+
+  const litter = useApi(() => getLitter(id), [id])
+  const fatherId = litter.data?.fatherId ?? null
+  const motherId = litter.data?.motherId ?? null
+
+  const father = useApi(() => (fatherId ? getGerbil(fatherId) : Promise.resolve(null)), [fatherId])
+  const mother = useApi(() => (motherId ? getGerbil(motherId) : Promise.resolve(null)), [motherId])
+
+  // Juveniles = gerbils whose litterId is this litter.
+  const juveniles = useApi(
+    () =>
+      id
+        ? listGerbils({
+            filter: condition({ field: 'litterId', op: '==', value: id }),
+            orderBy: 'name',
+            page: 1,
+            pageSize: 1000,
+          })
+        : Promise.resolve(null),
+    [id],
+  )
+
+  // Expected Farbschlag distribution for this pairing (client-side GEN-1).
+  const expected: BreedingResult | null = useMemo(() => {
+    const fg = father.data?.genotype
+    const mg = mother.data?.genotype
+    if (!fg || !mg || !isValidGenotype(fg) || !isValidGenotype(mg)) return null
+    return breed(fromDisplayString(fg), fromDisplayString(mg))
+  }, [father.data, mother.data])
+
+  if (litter.loading) return <p className="muted">{de.common.loading}</p>
+  if (litter.error || !litter.data) {
+    return (
+      <section className="page">
+        <p className="muted">{litter.error ?? t.detail.notFound}</p>
+        <Link to="/wuerfe" className="btn">
+          {t.detail.back}
+        </Link>
+      </section>
+    )
+  }
+
+  const l = litter.data
+  const registered = juveniles.data?.totalCount ?? 0
+  const parentLink = (id: string | null, g: { name: string } | null) =>
+    id && g ? <Link to={`/rennmaeuse/${id}`}>{g.name}</Link> : t.detail.unknownParent
+
   return (
     <section className="page">
-      <h2>{de.pages.litters.title}</h2>
+      <header className="page-head">
+        <h2>{l.name}</h2>
+        <div className="head-actions">
+          <Link to={`/wuerfe/${l.id}/bearbeiten`} className="btn btn--primary">
+            {t.detail.edit}
+          </Link>
+          <Link to="/wuerfe" className="btn">
+            {t.detail.back}
+          </Link>
+        </div>
+      </header>
+
+      <dl className="def-list">
+        <div className="def-row">
+          <dt>{t.fields.date}</dt>
+          <dd>{formatDate(l.date)}</dd>
+        </div>
+        <div className="def-row">
+          <dt>{t.detail.parents}</dt>
+          <dd>
+            {parentLink(fatherId, father.data)} × {parentLink(motherId, mother.data)}
+          </dd>
+        </div>
+        <div className="def-row">
+          <dt>{t.detail.registered}</dt>
+          <dd>
+            {registered}
+            {l.totalBorn != null ? ` / ${l.totalBorn}` : ''}
+          </dd>
+        </div>
+        <div className="def-row">
+          <dt>{t.fields.expectedGoHomeDate}</dt>
+          <dd>{formatDate(l.expectedGoHomeDate)}</dd>
+        </div>
+        {l.notes && (
+          <div className="def-row">
+            <dt>{t.fields.notes}</dt>
+            <dd>{l.notes}</dd>
+          </div>
+        )}
+      </dl>
+
+      <div className="page-head">
+        <h3>{t.detail.juveniles}</h3>
+        <Link
+          to={`/rennmaeuse/neu?litterId=${l.id}${l.date ? `&dob=${l.date}` : ''}`}
+          className="btn btn--primary"
+        >
+          + {t.detail.registerJuvenile}
+        </Link>
+      </div>
+      {juveniles.loading && <p className="muted">{de.common.loading}</p>}
+      {!juveniles.loading && registered === 0 && <p className="muted">{t.detail.noJuveniles}</p>}
+      {registered > 0 && (
+        <ul className="card-list">
+          {(juveniles.data?.items ?? []).map((g) => (
+            <li key={g.id}>
+              <Link to={`/rennmaeuse/${g.id}`} className="gerbil-card">
+                <span className="gerbil-card__name">{g.name}</span>
+                <span className="gerbil-card__meta">{de.pages.gerbils.genderLabels[g.gender]}</span>
+              </Link>
+            </li>
+          ))}
+        </ul>
+      )}
+
+      <h3>{t.detail.expectedColors}</h3>
+      {expected ? (
+        <BreedingResultView result={expected} title={t.detail.expectedColors} />
+      ) : (
+        <p className="muted">{t.detail.needParentsGenotype}</p>
+      )}
     </section>
   )
 }