Compute age from valid DOB in extraction

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

@@ -11,6 +11,12 @@ import com.android.trisolarisserver.repo.PropertyRepo
 import com.fasterxml.jackson.core.type.TypeReference
 import com.fasterxml.jackson.databind.ObjectMapper
 import java.time.OffsetDateTime
+import java.time.LocalDate
+import java.time.Period
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.time.format.DateTimeFormatterBuilder
+import java.time.format.ResolverStyle
 import java.util.UUID
 import org.slf4j.LoggerFactory
 
@@ -268,6 +274,7 @@ class DocumentExtractionService(
         normalizeIdNumber(results)
         logIdNumber("after-normalize-id-digits", document.id, results)
         normalizeAddress(results)
+        computeAgeIfDobPresent(results, propertyId)
         applyBookingCityUpdates(document, results)
         // Final Aadhaar checksum pass before doc type decision.
         markAadhaarIfValid(results)
@@ -317,6 +324,18 @@ class DocumentExtractionService(
         results[key] = normalized
     }
 
+    private fun computeAgeIfDobPresent(results: MutableMap<String, String>, propertyId: UUID) {
+        val dobRaw = cleanedValue(results[DocumentPrompts.DOB.first]) ?: return
+        val dob = parseDob(dobRaw) ?: return
+        val property = propertyRepo.findById(propertyId).orElse(null) ?: return
+        val zone = runCatching { ZoneId.of(property.timezone) }.getOrNull() ?: ZoneId.systemDefault()
+        val today = LocalDate.now(zone)
+        val years = Period.between(dob, today).years
+        if (years in 0..120) {
+            results["age"] = years.toString()
+        }
+    }
+
     private fun markAadhaarIfValid(results: MutableMap<String, String>) {
         val idKey = DocumentPrompts.ID_NUMBER.first
         val digits = normalizeDigits(cleanedValue(results[idKey]))
@@ -696,6 +715,24 @@ private fun unorderedMatchCount(a: String, b: String): Int {
     }
     return total
 }
+
+private fun parseDob(value: String): LocalDate? {
+    val cleaned = value.trim().replace(Regex("\\s+"), "")
+    val formatters = listOf(
+        DateTimeFormatterBuilder().parseCaseInsensitive().appendPattern("dd/MM/uuuu").toFormatter(),
+        DateTimeFormatterBuilder().parseCaseInsensitive().appendPattern("dd-MM-uuuu").toFormatter(),
+        DateTimeFormatterBuilder().parseCaseInsensitive().appendPattern("uuuu-MM-dd").toFormatter(),
+        DateTimeFormatterBuilder().parseCaseInsensitive().appendPattern("uuuu/MM/dd").toFormatter()
+    ).map { it.withResolverStyle(ResolverStyle.STRICT) }
+
+    for (formatter in formatters) {
+        try {
+            return LocalDate.parse(cleaned, formatter)
+        } catch (_: Exception) {
+        }
+    }
+    return null
+}
 private fun extractPinFromValue(value: String?): String? {
     if (value.isNullOrBlank()) return null
     val compact = value.replace(Regex("\\s+"), "")