extract and test the four-step GIS workflow

Extracted for its error paths, not its size. Every step can fail or return
nothing, and each outcome has to leave the operator with a status that says
where the chain stopped — a workflow reporting "afgerond" after a step produced
nothing tells them a result exists when it does not. Inline in the component,
none of that was exercised; it now has fourteen tests covering each stopping
point, both rejection kinds, the reuse path and the preconditions.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/src/components/map/MapWorkspace.tsx

@@ -7,6 +7,7 @@ import { useOfficialMapProducts } from '../../hooks/useOfficialMapProducts'
 import { useTemporalComparison } from '../../hooks/useTemporalComparison'
 import { isValueRampRasterSource, useMapImageOverlays } from '../../hooks/useMapImageOverlays'
 import { useMapRectangleSelection } from '../../hooks/useMapRectangleSelection'
+import { useFullGisWorkflow } from '../../hooks/useFullGisWorkflow'
 import { getDatasetDisplayName, getDatasetSourceDisplayName } from '../../lib/datasetDisplay'
 import { TemporalTrendChart } from './TemporalTrendChart'
 import { MunicipalitySearch } from './MunicipalitySearch'
@@ -324,10 +325,6 @@ export function MapWorkspace({
     bboxInput,
     setBboxInput,
   } = rectangle
-  const [fullWorkflowRunning, setFullWorkflowRunning] = useState(false)
-  const [fullWorkflowStatus, setFullWorkflowStatus] = useState('Klaar om de volledige GIS-werkstroom uit te voeren.')
-  const [fullWorkflowError, setFullWorkflowError] = useState<string | null>(null)
-  const [fullWorkflowMode, setFullWorkflowMode] = useState<'new' | 'reuse'>('new')
   const [mapAnalysisDurationMs, setMapAnalysisDurationMs] = useState<number | null>(null)
   const mapAnalysisRequestSequence = useRef(0)
   const regionalScopeSelected = Boolean(selectedMapArea && !isMunicipalityAreaName(selectedMapArea.name))
@@ -1463,75 +1460,26 @@ export function MapWorkspace({
     void analyzeSelection(bbox, areaIdForSelection(bbox))
   }
 
-  const runFullGisWorkflow = async () => {
-    const bbox = currentSelectionBbox ?? selectedAreaBbox ?? activeLayerBbox
-    if (fullWorkflowMode === 'reuse') {
-      if (!latestSelectionDataset) {
-        setFullWorkflowError('Bewaar eerst een kaartselectie voordat je het laatste resultaat opnieuw gebruikt.')
-        return
-      }
-      if (!selectedMapQaReferenceDatasetId) {
-        setFullWorkflowError('Kies eerst een referentielaag voor de kwaliteitscontrole.')
-        return
-      }
-      setFullWorkflowRunning(true)
-      setFullWorkflowError(null)
-      try {
-        setFullWorkflowStatus('Laatste bewaarde resultaatlaag opnieuw controleren...')
-        const qaResult = await onRunMapSelectionQa(latestSelectionDataset)
-        setFullWorkflowStatus(qaResult ? 'Het laatste bewaarde resultaat is opnieuw gebruikt en gecontroleerd.' : 'Het laatste resultaat is gebruikt, maar de kwaliteitscontrole is niet afgerond.')
-      } catch (error) {
-        setFullWorkflowError(error instanceof Error ? error.message : 'Full GIS workflow failed.')
-        setFullWorkflowStatus('De werkstroom is gestopt.')
-      } finally {
-        setFullWorkflowRunning(false)
-      }
-      return
-    }
-
-    if (!selectedMapDataset || !bbox) {
-      setFullWorkflowError('Kies een kaartlaag en een werkgebied of laagbegrenzing.')
-      return
-    }
-
-    setFullWorkflowRunning(true)
-    setFullWorkflowError(null)
-    try {
-      setFullWorkflowStatus('1/4 Bewaarde kaartobjecten selecteren...')
-      setSelectionBbox(bbox)
-      const selectionAreaId = areaIdForSelection(bbox)
-      const selection = await onRunMapSelectionExtract(bbox, selectionAreaId)
-      if (!selection) {
-        setFullWorkflowError('De ruimtelijke selectie kon niet worden afgerond.')
-        setFullWorkflowStatus('Stopped at query.')
-        return
-      }
-
-      setFullWorkflowStatus('2/4 Saving derived result dataset...')
-      const derived = await onDeriveMapSelectionDataset(bbox, selectionAreaId)
-      if (!derived) {
-        setFullWorkflowError('De afgeleide resultaatlaag kon niet worden aangemaakt.')
-        setFullWorkflowStatus('Stopped at dataset save.')
-        return
-      }
-
-      setFullWorkflowStatus('3/4 Saving GeoJSON export artifact...')
-      await onExportMapSelection(bbox, selectionAreaId)
-
-      if (selectedMapQaReferenceDatasetId) {
-        setFullWorkflowStatus('4/4 Kwaliteit vergelijken met de gekozen referentielaag...')
-        const qaResult = await onRunMapSelectionQa(derived)
-        setFullWorkflowStatus(qaResult ? 'De volledige GIS-werkstroom en kwaliteitscontrole zijn afgerond.' : 'Resultaat en download zijn gereed; de kwaliteitscontrole is niet afgerond.')
-      } else {
-        setFullWorkflowStatus('Resultaat en download zijn gereed. Kies een referentielaag om de kwaliteit te controleren.')
-      }
-    } catch (error) {
-      setFullWorkflowError(error instanceof Error ? error.message : 'Full GIS workflow failed.')
-      setFullWorkflowStatus('De werkstroom is gestopt.')
-    } finally {
-      setFullWorkflowRunning(false)
-    }
-  }
+  const fullWorkflow = useFullGisWorkflow({
+    selectedDataset: selectedMapDataset,
+    latestSelectionDataset,
+    qaReferenceDatasetId: selectedMapQaReferenceDatasetId,
+    resolveBbox: () => currentSelectionBbox ?? selectedAreaBbox ?? activeLayerBbox,
+    resolveAreaId: areaIdForSelection,
+    setSelectionBbox,
+    onRunSelectionExtract: onRunMapSelectionExtract,
+    onDeriveDataset: onDeriveMapSelectionDataset,
+    onExportSelection: onExportMapSelection,
+    onRunQa: onRunMapSelectionQa,
+  })
+  const {
+    running: fullWorkflowRunning,
+    status: fullWorkflowStatus,
+    error: fullWorkflowError,
+    mode: fullWorkflowMode,
+    setMode: setFullWorkflowMode,
+    run: runFullGisWorkflow,
+  } = fullWorkflow
 
   if (!advancedMode) {
     return (