Persist map selections as derived datasets

frontend/src/hooks/useMapSelectionDataset.ts

@@ -0,0 +1,57 @@
+import { useState } from 'react'
+import type { DatasetCreateResponse, VectorSelectionBBox } from '../types'
+import { formatError } from '../lib/formatError'
+import { datasetsApi } from '../services/api'
+
+interface UseMapSelectionDatasetOptions {
+  selectedProjectId: string | null
+  selectedDataset: DatasetCreateResponse | null
+  isVectorDatasetType: (datasetType: string) => boolean
+  loadProjectData: (projectId: string) => Promise<unknown>
+  loadDatasetDetails: (projectId: string, dataset: DatasetCreateResponse) => Promise<void>
+  setMapLayerVisible: (visible: boolean) => void
+}
+
+export function useMapSelectionDataset({
+  selectedProjectId,
+  selectedDataset,
+  isVectorDatasetType,
+  loadProjectData,
+  loadDatasetDetails,
+  setMapLayerVisible,
+}: UseMapSelectionDatasetOptions) {
+  const [selectionDatasetSaving, setSelectionDatasetSaving] = useState(false)
+  const [selectionDatasetError, setSelectionDatasetError] = useState<string | null>(null)
+  const [latestSelectionDataset, setLatestSelectionDataset] = useState<DatasetCreateResponse | null>(null)
+
+  const deriveMapSelectionDataset = async (bbox: VectorSelectionBBox) => {
+    if (!selectedProjectId || !selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
+      setSelectionDatasetError('Select a vector dataset before saving the area as a dataset.')
+      return
+    }
+    setSelectionDatasetSaving(true)
+    setSelectionDatasetError(null)
+    try {
+      const derived = await datasetsApi.deriveVectorSelection(selectedProjectId, selectedDataset.id, {
+        bbox: { ...bbox, crs: 'EPSG:4326' },
+        limit: 250,
+        output_name: `${selectedDataset.name.replace(/\.(geo)?json$/i, '')}-selection-dataset`,
+      })
+      setLatestSelectionDataset(derived)
+      await loadProjectData(selectedProjectId)
+      await loadDatasetDetails(selectedProjectId, derived)
+      setMapLayerVisible(true)
+    } catch (error) {
+      setSelectionDatasetError(formatError(error, 'Failed to save area as dataset'))
+    } finally {
+      setSelectionDatasetSaving(false)
+    }
+  }
+
+  return {
+    selectionDatasetSaving,
+    selectionDatasetError,
+    latestSelectionDataset,
+    deriveMapSelectionDataset,
+  }
+}