Persist map area selection exports

frontend/src/hooks/useExportWorkflow.ts

@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import { exportsApi } from '../services/api'
-import type { DatasetCreateResponse, ExportCreateResponse, ExportRead } from '../types'
+import type { DatasetCreateResponse, ExportCreateResponse, ExportRead, VectorSelectionBBox } from '../types'
 import { formatError } from '../lib/formatError'
 
 interface ExportWorkflowOptions {
@@ -23,6 +23,9 @@ export function useExportWorkflow({
   const [exportError, setExportError] = useState<string | null>(null)
   const [loadingExports, setLoadingExports] = useState(false)
   const [exporting, setExporting] = useState(false)
+  const [selectionExporting, setSelectionExporting] = useState(false)
+  const [selectionExportError, setSelectionExportError] = useState<string | null>(null)
+  const [latestSelectionExport, setLatestSelectionExport] = useState<ExportCreateResponse | null>(null)
   const [exportPreview, setExportPreview] = useState<Record<string, unknown> | null>(null)
 
   const loadExports = async (projectId = selectedProjectId) => {
@@ -106,6 +109,31 @@ export function useExportWorkflow({
     }
   }
 
+  const exportMapSelectionGeoJson = async (bbox: VectorSelectionBBox) => {
+    if (!selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
+      setSelectionExportError('Select a vector dataset before saving an area export.')
+      return
+    }
+    setSelectionExporting(true)
+    setSelectionExportError(null)
+    try {
+      const response = await exportsApi.exportGeojson({
+        dataset_id: selectedDataset.id,
+        export_kind: 'vector_selection',
+        bbox: { ...bbox, crs: 'EPSG:4326' },
+        limit: 250,
+        name: `${selectedDataset.name.replace(/\.(geo)?json$/i, '')}-selection`,
+      })
+      setLatestExport(response)
+      setLatestSelectionExport(response)
+      await loadExports(selectedDataset.project_id)
+    } catch (error) {
+      setSelectionExportError(formatError(error, 'Failed to save area export'))
+    } finally {
+      setSelectionExporting(false)
+    }
+  }
+
   const exportProjectMetadata = async () => {
     if (!selectedProjectId) {
       setExportError('Select a project before exporting metadata.')
@@ -159,6 +187,8 @@ export function useExportWorkflow({
   const resetExportsForProject = () => {
     setExports([])
     setLatestExport(null)
+    setLatestSelectionExport(null)
+    setSelectionExportError(null)
     setExportPreview(null)
   }
 
@@ -168,11 +198,15 @@ export function useExportWorkflow({
     exportError,
     loadingExports,
     exporting,
+    selectionExporting,
+    selectionExportError,
+    latestSelectionExport,
     exportPreview,
     loadExports,
     exportSelectedDatasetGeoJson,
     exportSelectedDetectionRunGeoJson,
     exportSelectedSegmentationRunGeoJson,
+    exportMapSelectionGeoJson,
     exportProjectMetadata,
     exportProjectReport,
     previewExportContent,