Extract Responses from Documents

// Upload the scan; open the draft in the form for review
async function extract(file) {
  const body = new FormData();
  body.append("scan", file);
  const res = await fetch("/api/work-orders/extract", { method: "POST", body });
  const result = await res.json();
  if (!res.ok) throw new Error(result.error);
  survey.data = result.answers;   // a person checks and corrects, then saves as usual
  return result;                  // { answers, confidence, uniqueId }
}

// POST /api/work-orders/extract — send the uploaded scan to the SurveyJS service; return a draft response
Route::post('/api/work-orders/extract', function (Request $request) {
    $scan = $request->file('scan') ?? abort(400, 'Upload the scan in a field named "scan"');
    abort_if(! $scan->isValid() || $scan->getSize() > 5 * 1024 * 1024, 413, 'The scan must be a file of 5 MB or less');
    $out = SurveyJsService::post('/extract', [                                  // JSON with base64, not multipart
        'schema' => json_decode(DB::table('forms')->where('key', 'work-order')->value('json')), 'document' => base64_encode($scan->get())], timeout: 120);
    $result = $out->object();

    return match (true) {                                                       // nothing is saved: a person reviews the draft
        $out->status() === 200 && is_object($result) && is_object($result->data ?? null) => response()->json(
            ['answers' => $result->data, 'confidence' => $result->confidence ?? [], 'uniqueId' => $result->uniqueId ?? null]),
        $out->status() === 400 && $out->json('error') === 'INVALID_DOCUMENT' => response()->json(['error' => 'The file is not a PDF, PNG, JPEG, WebP or GIF document'], 400),
        $out->status() === 503 && $out->json('error') === 'AI_NOT_CONFIGURED' => response()->json(['error' => 'The SurveyJS service has no AI provider configured'], 503),
        $out->status() === 502 && $out->json('error') === 'EXTRACTION_FAILED' => response()->json(['error' => 'Could not extract the response from the document'], 502),
        default => SurveyJsService::unexpected('/extract', $out),
    };
});