Validate Aadhaar and retry extraction

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

@@ -85,6 +85,7 @@ class DocumentExtractionService(
                         for ((key, question) in aadharFrontQuestions) {
                             results[key] = llamaClient.ask(imageUrl, question)
                         }
+                        ensureAadhaarId(imageUrl, results)
                     }
                 }
             ),
@@ -269,6 +270,26 @@ class DocumentExtractionService(
         }
     }
 
+    private fun ensureAadhaarId(imageUrl: String, results: MutableMap<String, String>) {
+        val key = DocumentPrompts.ID_NUMBER.first
+        val current = cleanedValue(results[key])
+        val normalized = normalizeDigits(current)
+        if (normalized != null && isValidAadhaar(normalized)) {
+            results[key] = formatAadhaar(normalized)
+            return
+        }
+        val retry = llamaClient.ask(
+            imageUrl,
+            "AADHAAR NUMBER (12 digits). Read extremely carefully. Reply ONLY the 12 digits or NONE."
+        )
+        val retryNormalized = normalizeDigits(cleanedValue(retry))
+        if (retryNormalized != null && isValidAadhaar(retryNormalized)) {
+            results[key] = formatAadhaar(retryNormalized)
+        } else {
+            results[key] = "NONE"
+        }
+    }
+
     private fun applyGuestUpdates(
         document: GuestDocument,
         propertyId: UUID,
@@ -340,6 +361,28 @@ private fun cleanedValue(value: String?): String? {
 private val standardPlateRegex = Regex("^[A-Z]{2}\\d{1,2}[A-Z]{1,3}\\d{3,4}$")
 private val bhPlateRegex = Regex("^\\d{2}BH\\d{4}[A-Z]{1,2}$")
 private val pinCodeRegex = Regex("\\b\\d{6}\\b")
+private val aadhaarMultiplication = arrayOf(
+    intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9),
+    intArrayOf(1, 2, 3, 4, 0, 6, 7, 8, 9, 5),
+    intArrayOf(2, 3, 4, 0, 1, 7, 8, 9, 5, 6),
+    intArrayOf(3, 4, 0, 1, 2, 8, 9, 5, 6, 7),
+    intArrayOf(4, 0, 1, 2, 3, 9, 5, 6, 7, 8),
+    intArrayOf(5, 9, 8, 7, 6, 0, 4, 3, 2, 1),
+    intArrayOf(6, 5, 9, 8, 7, 1, 0, 4, 3, 2),
+    intArrayOf(7, 6, 5, 9, 8, 2, 1, 0, 4, 3),
+    intArrayOf(8, 7, 6, 5, 9, 3, 2, 1, 0, 4),
+    intArrayOf(9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+)
+private val aadhaarPermutation = arrayOf(
+    intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9),
+    intArrayOf(1, 5, 7, 6, 2, 8, 3, 0, 9, 4),
+    intArrayOf(5, 8, 0, 3, 7, 9, 6, 1, 4, 2),
+    intArrayOf(8, 9, 1, 6, 0, 4, 3, 5, 2, 7),
+    intArrayOf(9, 4, 5, 3, 1, 2, 6, 8, 7, 0),
+    intArrayOf(4, 2, 8, 6, 5, 7, 3, 9, 0, 1),
+    intArrayOf(2, 7, 9, 3, 8, 0, 6, 4, 1, 5),
+    intArrayOf(7, 0, 4, 6, 9, 1, 3, 2, 5, 8)
+)
 
 private fun extractPinFromValue(value: String?): String? {
     if (value.isNullOrBlank()) return null
@@ -356,3 +399,25 @@ private fun extractPinFromAddress(value: String?): String? {
     val match = pinCodeRegex.find(value) ?: return null
     return match.value
 }
+
+private fun normalizeDigits(value: String?): String? {
+    if (value.isNullOrBlank()) return null
+    val digits = value.filter { it.isDigit() }
+    return if (digits.isBlank()) null else digits
+}
+
+private fun formatAadhaar(value: String): String {
+    if (value.length != 12) return value
+    return value.chunked(4).joinToString(" ")
+}
+
+private fun isValidAadhaar(value: String): Boolean {
+    if (value.length != 12 || !value.all { it.isDigit() }) return false
+    var c = 0
+    val reversed = value.reversed()
+    for (i in reversed.indices) {
+        val digit = reversed[i].digitToInt()
+        c = aadhaarMultiplication[c][aadhaarPermutation[i % 8][digit]]
+    }
+    return c == 0
+}

src/main/kotlin/com/android/trisolarisserver/controller/DocumentPrompts.kt

@@ -3,7 +3,7 @@ package com.android.trisolarisserver.controller
 object DocumentPrompts {
     val NAME = "name" to "NAME? Reply only the name or NONE."
     val DOB = "dob" to "DOB? Reply only date or NONE."
-    val ID_NUMBER = "idNumber" to "ID NUMBER? Reply only number or NONE."
+    val ID_NUMBER = "idNumber" to "ID NUMBER? Read extremely carefully. Reply only number or NONE."
     val ADDRESS = "address" to "POSTAL ADDRESS ONLY (street/area/city/state). Ignore IDs, UUIDs, and codes. Reply only address or NONE."
     val PIN_CODE = "pinCode" to "POSTAL PIN CODE (6 digits). Do NOT return Aadhaar or 12-digit numbers. Reply only pin or NONE."
     val CITY = "city" to "CITY? Reply only city or NONE."