chore: add button to download python script for verification

Author: ArtemSBulgakov

frontend/src/routes/history.$id.tsx

@@ -1,5 +1,6 @@
 import { createFileRoute, Link } from '@tanstack/react-router'
-import { CheckCircle2, History, ArrowLeft, Calendar, Hash, Settings, Palette, ExternalLink, Globe } from 'lucide-react'
+import { CheckCircle2, History, ArrowLeft, Calendar, Hash, Settings, Palette, ExternalLink, Globe, FileCode, Loader2 } from 'lucide-react'
+import { useCallback, useRef, useState, useEffect } from 'react'
 
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
@@ -15,6 +16,64 @@ export const Route = createFileRoute('/history/$id')({
       params: { path: { id } },
     })
 
+    const [pythonDownloadStatus, setPythonDownloadStatus] = useState<'idle' | 'loading' | 'success' | 'failed'>('idle')
+    const pythonDownloadTimeoutRef = useRef<number | null>(null)
+
+    const clearPythonStatusTimeout = useCallback(() => {
+      if (pythonDownloadTimeoutRef.current !== null) {
+        window.clearTimeout(pythonDownloadTimeoutRef.current)
+        pythonDownloadTimeoutRef.current = null
+      }
+    }, [])
+
+    const schedulePythonStatusReset = useCallback(() => {
+      clearPythonStatusTimeout()
+      pythonDownloadTimeoutRef.current = window.setTimeout(() => {
+        setPythonDownloadStatus('idle')
+        pythonDownloadTimeoutRef.current = null
+      }, 2000)
+    }, [clearPythonStatusTimeout])
+
+    const handleDownloadPythonScript = useCallback(async () => {
+      if (!data?.result?.length) return
+      try {
+        setPythonDownloadStatus('loading')
+        clearPythonStatusTimeout()
+        const searchParams = new URLSearchParams()
+        if (data.footprint) {
+          searchParams.set('footprint', data.footprint)
+        }
+        data.result.forEach((value: number) => {
+          searchParams.append('numbers', String(value))
+        })
+        const response = await fetch(`/api/random-generator/verify-python-code?${searchParams.toString()}`, {
+          credentials: 'include',
+        })
+        if (!response.ok) {
+          throw new Error('Failed to download script')
+        }
+        const blob = await response.blob()
+        const url = URL.createObjectURL(blob)
+        const anchor = document.createElement('a')
+        const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
+        anchor.href = url
+        anchor.download = `check_${timestamp}.py`
+        anchor.click()
+        URL.revokeObjectURL(url)
+        setPythonDownloadStatus('success')
+      } catch (error) {
+        setPythonDownloadStatus('failed')
+      } finally {
+        schedulePythonStatusReset()
+      }
+    }, [data, clearPythonStatusTimeout, schedulePythonStatusReset])
+
+    useEffect(() => {
+      return () => {
+        clearPythonStatusTimeout()
+      }
+    }, [clearPythonStatusTimeout])
+
 
     if (isServerPending) {
       return (
@@ -140,15 +199,36 @@ export const Route = createFileRoute('/history/$id')({
                         <CheckCircle2 className="h-4 w-4 text-primary" />
                         <span className="font-medium text-foreground">Криптографическая подпись</span>
                       </div>
-                        <Button asChild variant="outline" size="sm">
-                          <Link to="/verify" search={{ footprint: data.footprint, numbers: data.result.join(',') }}>
-                            Проверить подпись
-                          </Link>
-                        </Button>
+                        <div className="flex gap-2">
+                          <Button asChild variant="outline" size="sm">
+                            <Link to="/verify" search={{ footprint: data.footprint, numbers: data.result.join(',') }}>
+                              Проверить подпись
+                            </Link>
+                          </Button>
+                          <Button
+                            variant="outline"
+                            size="sm"
+                            onClick={handleDownloadPythonScript}
+                            disabled={pythonDownloadStatus === 'loading'}
+                          >
+                            {pythonDownloadStatus === 'loading' ? (
+                              <Loader2 className="mr-2 h-4 w-4 animate-spin" aria-hidden />
+                            ) : (
+                              <FileCode className="mr-2 h-4 w-4" aria-hidden />
+                            )}
+                            Python-скрипт
+                          </Button>
+                        </div>
                       </div>
                       <code className="block rounded-md border border-border/60 bg-background px-3 py-2 text-xs break-all">
                         {data.footprint}
                       </code>
+                      {pythonDownloadStatus === 'success' && (
+                        <p className="text-xs text-green-600">Скрипт check.py сохранён.</p>
+                      )}
+                      {pythonDownloadStatus === 'failed' && (
+                        <p className="text-xs text-red-600">Не удалось скачать скрипт. Попробуйте ещё раз.</p>
+                      )}
                     </div>
                   )}
                 </CardContent>