extractor: improve rules for extracting aadhar by verifying checksum

src/main/kotlin/com/android/trisolarisserver/component/DocumentExtractionService.kt

@@ -240,6 +240,7 @@ class DocumentExtractionService(
 
         normalizePinCode(results)
         normalizeIdNumber(results)
+        markAadhaarIfValid(results)
         results["docType"] = computeDocType(results, handled)
         applyGuestUpdates(document, propertyId, results)
         return ExtractionResult(results, handled)
@@ -265,7 +266,7 @@ class DocumentExtractionService(
         val fromAddress = extractPinFromAddress(address)
 
         val chosen = fromPin ?: fromAddress
-        results[pinKey] = chosen ?: "NONE"
+        results[pinKey] = if (isValidPin(chosen)) chosen!! else "NONE"
     }
 
     private fun normalizeIdNumber(results: MutableMap<String, String>) {
@@ -277,6 +278,14 @@ class DocumentExtractionService(
         }
     }
 
+    private fun markAadhaarIfValid(results: MutableMap<String, String>) {
+        val idKey = DocumentPrompts.ID_NUMBER.first
+        val digits = normalizeDigits(cleanedValue(results[idKey]))
+        if (digits != null && isValidAadhaar(digits)) {
+            results["hasAadhar"] = "YES"
+        }
+    }
+
     private fun computeDocType(results: Map<String, String>, handled: Boolean): String {
         if (!handled) return "GENERAL"
         return when {
@@ -454,3 +463,8 @@ private fun normalizeDigits(value: String?): String? {
     val digits = value.filter { it.isDigit() }
     return digits.ifBlank { null }
 }
+
+private fun isValidPin(value: String?): Boolean {
+    if (value.isNullOrBlank()) return false
+    return pinCodeRegex.matches(value)
+}