Enhance TrainingUnitSectionsEditor with new section management features

- Introduced functions to add and manage parallel phases and sections, allowing for more flexible training unit configurations.
- Implemented logic to handle the addition of whole group sections and parallel streams, improving the user experience in the editor.
- Added utility functions for reordering sections and checking for content within parallel stream buckets.
- Updated state management to ensure proper handling of section titles and removal of streams, enhancing overall functionality.

frontend/src/components/TrainingUnitSectionsEditor.jsx

@@ -1,5 +1,5 @@
 import React, { Fragment, useCallback, useEffect, useMemo, useState } from 'react'
-import { GripVertical, Pencil } from 'lucide-react'
+import { GripVertical, Pencil, X } from 'lucide-react'
 import CombinationMethodProfileEditor from './CombinationMethodProfileEditor'
 import CombinationPlanBracket from './CombinationPlanBracket'
 import { comboPlanningProfileJsonForEditor, effectiveComboMethodProfile } from '../utils/comboPlanningMethodProfile'
@@ -15,10 +15,12 @@ import {
   planLocKey,
   MAX_PARALLEL_STREAMS_PER_PHASE,
   parallelStreamVisual,
-  streamTabLabelFromIndices,
   streamsForParallelPhaseOrders,
   sectionIndicesForParallelStream,
   reorderWithinBucketIndices,
+  reorderWithoutIndices,
+  parallelStreamBucketHasContent,
+  dissolveParallelPhaseToWholeGroup,
   exerciseRow,
   noteRow,
   sectionPlannedMinutes,
@@ -270,27 +272,30 @@ export default function TrainingUnitSectionsEditor({
     })
   }
 
-  const addParallelPhase = () => {
+  const addParallelPhaseTwoStreams = () => {
     patch((prev) => {
       const nextPo = maxPhaseOrderIndexFromSections(prev) + 1
-      const pl = defaultPlanLocParallel(nextPo, 0)
-      const base = defaultSection(`Abschnitt ${prev.length + 1}`)
-      return [...prev, { ...base, planLoc: pl }]
+      const pl0 = defaultPlanLocParallel(nextPo, 0)
+      const pl1 = defaultPlanLocParallel(nextPo, 1)
+      const base0 = defaultSection(`Abschnitt ${prev.length + 1}`)
+      const base1 = defaultSection(`Abschnitt ${prev.length + 2}`)
+      return [...prev, { ...base0, planLoc: pl0 }, { ...base1, planLoc: pl1 }]
     })
   }
 
-  const addStreamToLastParallelPhase = () => {
+  const addStreamToParallelPhase = (phaseOrder) => {
     patch((prev) => {
-      const par = (prev || []).filter((s) => s?.planLoc?.phaseKind === 'parallel')
+      const po = Number(phaseOrder) || 0
+      const par = (prev || []).filter(
+        (s) => s?.planLoc?.phaseKind === 'parallel' && (s.planLoc.phaseOrderIndex ?? 0) === po
+      )
       if (!par.length) return prev
-      const maxP = Math.max(...par.map((s) => s.planLoc.phaseOrderIndex ?? 0))
-      const inPhase = par.filter((s) => (s.planLoc.phaseOrderIndex ?? 0) === maxP)
-      const distinctStreams = new Set(inPhase.map((s) => s.planLoc.parallelStreamOrderIndex ?? 0))
-      if (distinctStreams.size >= MAX_PARALLEL_STREAMS_PER_PHASE) return prev
-      const maxS = Math.max(...inPhase.map((s) => s.planLoc.parallelStreamOrderIndex ?? 0))
+      const distinct = new Set(par.map((s) => s.planLoc.parallelStreamOrderIndex ?? 0))
+      if (distinct.size >= MAX_PARALLEL_STREAMS_PER_PHASE) return prev
+      const maxS = Math.max(...par.map((s) => s.planLoc.parallelStreamOrderIndex ?? 0))
       const newSo = maxS + 1
       const tmpl = {
-        ...inPhase[0].planLoc,
+        ...par[0].planLoc,
         parallelStreamOrderIndex: newSo,
         streamTitle: null,
         streamNotes: null,
@@ -301,6 +306,110 @@ export default function TrainingUnitSectionsEditor({
     })
   }
 
+  const addWholeGroupSection = () => {
+    patch((prev) => {
+      const L = ensure(prev)
+      const wgs = L.filter((s) => s?.planLoc?.phaseKind === 'whole_group')
+      let pl
+      if (wgs.length) {
+        const maxPo = Math.max(...wgs.map((s) => s.planLoc.phaseOrderIndex ?? 0))
+        const sample = wgs.find((s) => (s.planLoc.phaseOrderIndex ?? 0) === maxPo)
+        pl = { ...sample.planLoc }
+      } else {
+        const nextPo = maxPhaseOrderIndexFromSections(L) + 1
+        pl = defaultPlanLocWholeGroup(nextPo)
+      }
+      const base = defaultSection(`Abschnitt ${L.length + 1}`)
+      return [...L, { ...base, planLoc: pl }]
+    })
+  }
+
+  const addSectionToParallelStream = (phaseOrder, streamOrder) => {
+    patch((prev) => {
+      const L = ensure(prev)
+      const po = Number(phaseOrder) || 0
+      const so = Number(streamOrder) || 0
+      const idxs = sectionIndicesForParallelStream(L, po, so)
+      const tmpl = idxs.length ? L[idxs[0]].planLoc : defaultPlanLocParallel(po, so)
+      const pl = {
+        ...tmpl,
+        phaseKind: 'parallel',
+        phaseOrderIndex: po,
+        parallelStreamOrderIndex: so,
+      }
+      const base = defaultSection(`Abschnitt ${L.length + 1}`)
+      if (!idxs.length) {
+        return [...L, { ...base, planLoc: pl }]
+      }
+      const insertAfter = Math.max(...idxs)
+      return [...L.slice(0, insertAfter + 1), { ...base, planLoc: pl }, ...L.slice(insertAfter + 1)]
+    })
+  }
+
+  const updateParallelPhaseTitleAll = (phaseOrder, title) => {
+    const po = Number(phaseOrder) || 0
+    const v = title.trim() ? title.trim() : null
+    patch((prev) =>
+      prev.map((s) => {
+        const L = s?.planLoc
+        if (L?.phaseKind !== 'parallel' || (L.phaseOrderIndex ?? 0) !== po) return s
+        return { ...s, planLoc: { ...L, phaseTitle: v } }
+      })
+    )
+  }
+
+  const updateParallelStreamTitleAll = (phaseOrder, streamOrder, title) => {
+    const po = Number(phaseOrder) || 0
+    const so = Number(streamOrder) || 0
+    const v = title.trim() ? title.trim() : null
+    patch((prev) =>
+      prev.map((s) => {
+        const L = s?.planLoc
+        if (
+          L?.phaseKind !== 'parallel' ||
+          (L.phaseOrderIndex ?? 0) !== po ||
+          (L.parallelStreamOrderIndex ?? 0) !== so
+        ) {
+          return s
+        }
+        return { ...s, planLoc: { ...L, streamTitle: v } }
+      })
+    )
+  }
+
+  const removeParallelStream = (phaseOrder, streamOrder) => {
+    const po = Number(phaseOrder) || 0
+    const so = Number(streamOrder) || 0
+    const idxs = sectionIndicesForParallelStream(list, po, so)
+    if (!idxs.length) return
+    if (
+      parallelStreamBucketHasContent(list, idxs, SECTION_INSERT_SEPARATOR_BODY) &&
+      !window.confirm(
+        'In diesem Stream sind Übungen oder Anmerkungen geplant. Stream wirklich löschen?'
+      )
+    ) {
+      return
+    }
+    patch((prev) => {
+      const L = ensure(prev)
+      const beforeOrders = streamsForParallelPhaseOrders(L, po)
+      const rm = sectionIndicesForParallelStream(L, po, so)
+      if (!rm.length) return prev
+      let next = reorderWithoutIndices(L, rm)
+      const afterOrders = streamsForParallelPhaseOrders(next, po)
+      if (beforeOrders.length >= 2 && afterOrders.length <= 1) {
+        if (
+          window.confirm(
+            'Nur noch eine Gruppe in dieser Phase übrig. Parallelen Aufbau auflösen und alle Abschnitte als gemeinsame Ganzgruppen-Phase weiterführen?'
+          )
+        ) {
+          next = dissolveParallelPhaseToWholeGroup(next, po)
+        }
+      }
+      return next
+    })
+  }
+
   const applySectionPlanTarget = (sIdx, rawKey) => {
     patch((prev) => {
       if (!rawKey) {
@@ -713,11 +822,6 @@ export default function TrainingUnitSectionsEditor({
 
   const list = ensure(sections)
 
-  const hasParallelPhase = useMemo(
-    () => list.some((s) => s?.planLoc?.phaseKind === 'parallel'),
-    [list]
-  )
-
   const firstSectionIndexByParallelPhase = useMemo(() => {
     const m = new Map()
     list.forEach((s, i) => {
@@ -737,15 +841,6 @@ export default function TrainingUnitSectionsEditor({
     return [...set].sort((a, b) => a - b)
   }, [list])
 
-  const cannotAddMoreStreams = useMemo(() => {
-    const par = list.filter((s) => s?.planLoc?.phaseKind === 'parallel')
-    if (!par.length) return true
-    const maxP = Math.max(...par.map((s) => s.planLoc.phaseOrderIndex ?? 0))
-    const inPhase = par.filter((s) => (s.planLoc.phaseOrderIndex ?? 0) === maxP)
-    const distinct = new Set(inPhase.map((s) => s.planLoc.parallelStreamOrderIndex ?? 0))
-    return distinct.size >= MAX_PARALLEL_STREAMS_PER_PHASE
-  }, [list])
-
   useEffect(() => {
     if (!enableParallelPhaseControls || !parallelPhaseOrdersPresent.length) return
     setParallelStreamTabByPhase((prev) => {
@@ -881,51 +976,6 @@ export default function TrainingUnitSectionsEditor({
           ) : null}
         </div>
       ) : null}
-      {enableParallelPhaseControls ? (
-        <div
-          className="card"
-          style={{
-            marginBottom: '1rem',
-            padding: '12px 14px',
-            background: 'var(--surface2)',
-            border: '1px solid var(--border, rgba(0,0,0,0.08))',
-            borderRadius: '10px',
-          }}
-        >
-          <div style={{ fontSize: '0.88rem', fontWeight: 600, marginBottom: '6px', color: 'var(--text1)' }}>
-            Breakout: Phasen und parallele Streams
-          </div>
-          <p style={{ margin: '0 0 12px', fontSize: '0.8rem', color: 'var(--text2)', lineHeight: 1.5 }}>
-            Legt fest, ob Abschnitte zur ganzen Gruppe oder zu parallelen Gruppen gehören. Pro paralleler Phase erscheinen
-            Reiter je Stream — nur der aktive Stream ist sichtbar (farbig am linken Rand). „Abschnitt hinzufügen“ übernimmt
-            die Zuordnung des letzten Abschnitts. Speichern erzeugt bei Bedarf automatisch den{' '}
-            <code style={{ fontSize: '0.78em' }}>phases</code>-Payload fürs Backend.
-          </p>
-          <div style={{ display: 'flex', flexWrap: 'wrap', gap: '8px', alignItems: 'center' }}>
-            <button type="button" className="btn btn-secondary" onClick={addWholeGroupPhase}>
-              Neue Ganzgruppen-Phase
-            </button>
-            <button type="button" className="btn btn-secondary" onClick={addParallelPhase}>
-              Neue parallele Phase
-            </button>
-            <button
-              type="button"
-              className="btn btn-secondary"
-              onClick={addStreamToLastParallelPhase}
-              disabled={!hasParallelPhase || cannotAddMoreStreams}
-              title={
-                !hasParallelPhase
-                  ? 'Zuerst eine parallele Phase anlegen'
-                  : cannotAddMoreStreams
-                    ? `Höchstens ${MAX_PARALLEL_STREAMS_PER_PHASE} Streams pro Phase`
-                    : 'Weiterer Stream in der letzten parallelen Phase (höchster Phasen-Index)'
-              }
-            >
-              Stream hinzufügen
-            </button>
-          </div>
-        </div>
-      ) : null}
       {list.map((sec, sIdx) => {
         const planMin = sectionPlannedMinutes(sec)
         const itemCount = sec.items?.length ?? 0
@@ -981,51 +1031,142 @@ export default function TrainingUnitSectionsEditor({
             enableParallelPhaseControls &&
             streamOrdersForParallelPhase.length ? (
               <div
-                role="tablist"
-                aria-label={`Parallele Streams · Phase ${parallelPhaseOrder}`}
                 style={{
-                  display: 'flex',
-                  flexWrap: 'wrap',
-                  gap: '6px',
-                  marginBottom: '10px',
-                  padding: '8px 10px',
+                  marginBottom: '12px',
+                  padding: '10px 12px',
                   background: 'var(--surface2)',
                   borderRadius: '10px',
                   border: '1px solid var(--border, rgba(0,0,0,0.08))',
                 }}
               >
-                {streamOrdersForParallelPhase.map((so) => {
-                  const sel =
-                    (parallelStreamTabByPhase[parallelPhaseOrder] ??
-                      streamOrdersForParallelPhase[0] ??
-                      0) === so
-                  const pv = parallelStreamVisual(so)
-                  const lab = streamTabLabelFromIndices(
-                    list,
-                    sectionIndicesForParallelStream(list, parallelPhaseOrder, so),
-                  )
-                  return (
-                    <button
-                      key={`p${parallelPhaseOrder}-tab-s${so}`}
-                      type="button"
-                      role="tab"
-                      aria-selected={sel}
-                      className="btn framework-ctrl framework-ctrl--xs"
-                      style={{
-                        margin: 0,
-                        border: sel ? `2px solid ${pv.border}` : `1px solid ${pv.border}`,
-                        background: sel ? pv.tabBgActive : pv.tabBg,
-                        color: 'var(--text1)',
-                        fontWeight: sel ? 600 : 500,
-                      }}
-                      onClick={() =>
-                        setParallelStreamTabByPhase((prev) => ({ ...prev, [parallelPhaseOrder]: so }))
-                      }
-                    >
-                      {lab}
-                    </button>
-                  )
-                })}
+                <div
+                  style={{
+                    display: 'flex',
+                    flexWrap: 'wrap',
+                    gap: '8px',
+                    alignItems: 'center',
+                    marginBottom: '10px',
+                  }}
+                >
+                  <label
+                    className="form-label"
+                    style={{ fontSize: '0.78rem', marginBottom: 0, flex: '0 0 auto' }}
+                  >
+                    Phase
+                  </label>
+                  <input
+                    className="form-input"
+                    style={{ flex: '2 1 160px', maxWidth: '280px', marginBottom: 0 }}
+                    value={
+                      (() => {
+                        const hi = firstSectionIndexByParallelPhase.get(parallelPhaseOrder)
+                        const t = hi != null ? list[hi]?.planLoc?.phaseTitle : null
+                        return t != null ? String(t) : ''
+                      })()
+                    }
+                    onChange={(e) => updateParallelPhaseTitleAll(parallelPhaseOrder, e.target.value)}
+                    placeholder={`Bezeichnung (z. B. Drill runden · Phase ${parallelPhaseOrder})`}
+                  />
+                  <button
+                    type="button"
+                    className="btn btn-secondary framework-ctrl framework-ctrl--xs"
+                    onClick={() => addStreamToParallelPhase(parallelPhaseOrder)}
+                    disabled={streamOrdersForParallelPhase.length >= MAX_PARALLEL_STREAMS_PER_PHASE}
+                    title={
+                      streamOrdersForParallelPhase.length >= MAX_PARALLEL_STREAMS_PER_PHASE
+                        ? `Höchstens ${MAX_PARALLEL_STREAMS_PER_PHASE} Streams`
+                        : 'Weitere parallele Gruppe'
+                    }
+                  >
+                    + Stream
+                  </button>
+                  <button
+                    type="button"
+                    className="btn btn-secondary framework-ctrl framework-ctrl--xs"
+                    onClick={() =>
+                      addSectionToParallelStream(parallelPhaseOrder, activeParallelStream ?? 0)
+                    }
+                    title="Neuer Abschnitt im gerade gewählten Stream"
+                  >
+                    + Abschnitt in diesem Stream
+                  </button>
+                </div>
+                <div
+                  role="tablist"
+                  aria-label={`Streams · Phase ${parallelPhaseOrder}`}
+                  style={{ display: 'flex', flexWrap: 'wrap', gap: '8px', alignItems: 'stretch' }}
+                >
+                  {streamOrdersForParallelPhase.map((so) => {
+                    const sel =
+                      (parallelStreamTabByPhase[parallelPhaseOrder] ??
+                        streamOrdersForParallelPhase[0] ??
+                        0) === so
+                    const pv = parallelStreamVisual(so)
+                    const si = sectionIndicesForParallelStream(list, parallelPhaseOrder, so)
+                    const titleSource = si.length ? list[si[0]]?.planLoc?.streamTitle : null
+                    const streamName = titleSource != null ? String(titleSource) : ''
+                    return (
+                      <div
+                        key={`p${parallelPhaseOrder}-chip-s${so}`}
+                        role="tab"
+                        aria-selected={sel}
+                        className={sel ? 'tu-stream-chip tu-stream-chip--active' : 'tu-stream-chip'}
+                        style={{
+                          display: 'inline-flex',
+                          alignItems: 'center',
+                          gap: '6px',
+                          padding: '4px 6px 4px 8px',
+                          borderRadius: '999px',
+                          cursor: 'pointer',
+                          border: sel ? `2px solid ${pv.border}` : `1px solid ${pv.border}`,
+                          background: sel ? pv.tabBgActive : pv.tabBg,
+                          maxWidth: '100%',
+                        }}
+                        onClick={() =>
+                          setParallelStreamTabByPhase((prev) => ({ ...prev, [parallelPhaseOrder]: so }))
+                        }
+                      >
+                        <input
+                          className="form-input"
+                          style={{
+                            minWidth: '5.5rem',
+                            maxWidth: '11rem',
+                            margin: 0,
+                            padding: '4px 8px',
+                            fontSize: '0.8rem',
+                            borderRadius: '8px',
+                            flex: '1 1 auto',
+                          }}
+                          value={streamName}
+                          onChange={(e) =>
+                            updateParallelStreamTitleAll(parallelPhaseOrder, so, e.target.value)
+                          }
+                          onClick={(e) => e.stopPropagation()}
+                          placeholder={`Gruppe ${so + 1}`}
+                          aria-label={`Name Stream ${so + 1}`}
+                        />
+                        <button
+                          type="button"
+                          className="tu-icon-btn"
+                          style={{
+                            flex: '0 0 auto',
+                            padding: '4px',
+                            color: 'var(--text2)',
+                            borderRadius: '8px',
+                          }}
+                          title="Stream entfernen"
+                          aria-label={`Stream ${so + 1} entfernen`}
+                          onClick={(e) => {
+                            e.stopPropagation()
+                            removeParallelStream(parallelPhaseOrder, so)
+                          }}
+                        >
+                          <X size={16} strokeWidth={2} aria-hidden />
+                        </button>
+                      </div>
+                    )
+                  })}
+                </div>
               </div>
             ) : null}
             {!hideParallelSection ? (
@@ -1115,8 +1256,24 @@ export default function TrainingUnitSectionsEditor({
                   }}
                 >
                   {sec.planLoc.phaseKind === 'whole_group'
-                    ? `Ganzgruppen-Phase ${sec.planLoc.phaseOrderIndex ?? 0}`
-                    : `Parallel · Phase ${sec.planLoc.phaseOrderIndex ?? 0} · Stream ${sec.planLoc.parallelStreamOrderIndex ?? 0}`}
+                    ? (() => {
+                        const pt = sec.planLoc.phaseTitle
+                        const po = sec.planLoc.phaseOrderIndex ?? 0
+                        return pt != null && String(pt).trim()
+                          ? `Ganzgruppe: ${String(pt).trim()} (Phase ${po})`
+                          : `Ganzgruppen-Phase ${po}`
+                      })()
+                    : (() => {
+                        const pt = sec.planLoc.phaseTitle
+                        const st = sec.planLoc.streamTitle
+                        const po = sec.planLoc.phaseOrderIndex ?? 0
+                        const so = sec.planLoc.parallelStreamOrderIndex ?? 0
+                        const phaseLbl =
+                          pt != null && String(pt).trim() ? String(pt).trim() : `Phase ${po}`
+                        const streamLbl =
+                          st != null && String(st).trim() ? String(st).trim() : `Gruppe ${so + 1}`
+                        return `Parallel · ${phaseLbl} · ${streamLbl}`
+                      })()}
                 </p>
               ) : null}
               <textarea
@@ -1696,13 +1853,46 @@ export default function TrainingUnitSectionsEditor({
         />
       ) : null}
 
-      <button
-        type="button"
-        className="btn btn-secondary framework-ctrl framework-ctrl--xs"
-        onClick={addSection}
+      <div
+        style={{
+          display: 'flex',
+          flexWrap: 'wrap',
+          gap: '8px',
+          alignItems: 'center',
+          marginTop: '0.75rem',
+        }}
       >
-        + Abschnitt hinzufügen
-      </button>
+        {enableParallelPhaseControls ? (
+          <>
+            <button type="button" className="btn btn-secondary framework-ctrl framework-ctrl--xs" onClick={addWholeGroupPhase}>
+              Neue Ganzgruppen-Phase
+            </button>
+            <button
+              type="button"
+              className="btn btn-secondary framework-ctrl framework-ctrl--xs"
+              onClick={addParallelPhaseTwoStreams}
+            >
+              Zwei Gruppen parallel
+            </button>
+            <button
+              type="button"
+              className="btn btn-secondary framework-ctrl framework-ctrl--xs"
+              onClick={addWholeGroupSection}
+              title="Neuer Abschnitt für die gemeinsame Gruppe (nicht für einen parallelen Stream)"
+            >
+              + Ganzgruppen-Abschnitt
+            </button>
+          </>
+        ) : null}
+        <button
+          type="button"
+          className="btn btn-secondary framework-ctrl framework-ctrl--xs"
+          onClick={addSection}
+          title="Letzte Zuordnung übernehmen (Phase / Stream)"
+        >
+          + Abschnitt hinzufügen
+        </button>
+      </div>
 
       {insertChooser ? (
         <div

frontend/src/utils/trainingUnitSectionsForm.js

@@ -139,7 +139,51 @@ export function sectionIndicesForParallelStream(sections, phaseOrderIndex, strea
   return out
 }
 
-/** Reihenfolge innerhalb eines Stream-Buckets (globale Indizes) ändern. */
+/** Abschnitte an den angegebenen globalen Indizes entfernen (mindestens ein Abschnitt bleibt). */
+export function reorderWithoutIndices(prev, removeGlobalIndices) {
+  const set = new Set(removeGlobalIndices || [])
+  const next = (prev || []).filter((_, i) => !set.has(i))
+  return next.length ? next : [defaultSection()]
+}
+
+/**
+ * Ob in den Abschnitten eines Stream-Buckets planerisch etwas steht (Übungen, Text-Anmerkungen).
+ * Trennlinien-Marker (---) zählen nicht als Inhalt.
+ */
+export function parallelStreamBucketHasContent(sections, globalIndices, separatorBody = '---') {
+  for (const gi of globalIndices || []) {
+    const sec = (sections || [])[gi]
+    if (!sec) continue
+    for (const it of sec.items || []) {
+      if ((it.item_type || '') === 'note') {
+        const b = (it.note_body || '').trim()
+        if (b && b !== separatorBody) return true
+      } else {
+        if (it.exercise_id) return true
+        if ((it.exercise_title || '').trim()) return true
+      }
+    }
+  }
+  return false
+}
+
+/** Parallele Phase auflösen: alle Abschnitte dieser Phase werden Ganzgruppe (gleicher phaseOrderIndex). */
+export function dissolveParallelPhaseToWholeGroup(sections, phaseOrderIndex) {
+  const po = Number(phaseOrderIndex) || 0
+  return (sections || []).map((s) => {
+    const L = s?.planLoc
+    if (L?.phaseKind !== 'parallel' || (L.phaseOrderIndex ?? 0) !== po) return s
+    return {
+      ...s,
+      planLoc: {
+        ...defaultPlanLocWholeGroup(po),
+        phaseTitle: L.phaseTitle ?? null,
+        phaseGuidanceNotes: L.phaseGuidanceNotes ?? null,
+      },
+    }
+  })
+}
+
 export function reorderWithinBucketIndices(prev, bucketGlobalIndicesSorted, oldPos, newPos) {
   const sortedIdx = [...bucketGlobalIndicesSorted].sort((a, b) => a - b)
   if (oldPos === newPos || oldPos < 0 || newPos < 0 || oldPos >= sortedIdx.length || newPos >= sortedIdx.length) {