Add map area selection extraction

frontend/src/hooks/useMapSelectionExtract.ts

@@ -0,0 +1,70 @@
+import { useEffect, useState } from 'react'
+import { datasetsApi } from '../services/api'
+import { formatError } from '../lib/formatError'
+import type { DatasetCreateResponse, VectorSelectionBBox, VectorSelectionResponse } from '../types'
+
+interface MapSelectionExtractOptions {
+  selectedProjectId: string | null
+  selectedDataset: DatasetCreateResponse | null
+  isVectorDatasetType: (datasetType: string) => boolean
+}
+
+export function useMapSelectionExtract({
+  selectedProjectId,
+  selectedDataset,
+  isVectorDatasetType,
+}: MapSelectionExtractOptions) {
+  const [mapSelectionBbox, setMapSelectionBbox] = useState<VectorSelectionBBox | null>(null)
+  const [mapSelectionResult, setMapSelectionResult] = useState<VectorSelectionResponse | null>(null)
+  const [mapSelectionLoading, setMapSelectionLoading] = useState(false)
+  const [mapSelectionError, setMapSelectionError] = useState<string | null>(null)
+
+  useEffect(() => {
+    setMapSelectionBbox(null)
+    setMapSelectionResult(null)
+    setMapSelectionError(null)
+  }, [selectedProjectId, selectedDataset?.id])
+
+  const runMapSelectionExtract = async (bbox: VectorSelectionBBox) => {
+    if (!selectedProjectId || !selectedDataset) {
+      setMapSelectionError('Open a vector dataset before extracting a map area.')
+      return
+    }
+    if (!isVectorDatasetType(selectedDataset.dataset_type)) {
+      setMapSelectionError('Area extraction requires an active vector dataset.')
+      return
+    }
+
+    setMapSelectionLoading(true)
+    setMapSelectionError(null)
+    setMapSelectionBbox(bbox)
+    try {
+      const response = await datasetsApi.selectVectorFeatures(selectedProjectId, selectedDataset.id, {
+        bbox: { ...bbox, crs: 'EPSG:4326' },
+        limit: 250,
+      })
+      setMapSelectionResult(response)
+    } catch (error) {
+      setMapSelectionResult(null)
+      setMapSelectionError(formatError(error, 'Area extraction failed'))
+    } finally {
+      setMapSelectionLoading(false)
+    }
+  }
+
+  const resetMapSelectionExtract = () => {
+    setMapSelectionBbox(null)
+    setMapSelectionResult(null)
+    setMapSelectionError(null)
+  }
+
+  return {
+    mapSelectionBbox,
+    mapSelectionResult,
+    mapSelectionLoading,
+    mapSelectionError,
+    runMapSelectionExtract,
+    resetMapSelectionExtract,
+    setMapSelectionBbox,
+  }
+}