auto unlock on correct pin

app/src/main/java/sh/sar/basedbank/LockActivity.kt

@@ -32,6 +32,8 @@ class LockActivity : AppCompatActivity() {
     private lateinit var salt: String
     private lateinit var storedHash: String
     private var biometricsEnabled = false
+    private var autoUnlockPin = false
+    private var pinLength = 4
     private var isVerifying = false
 
     private val lockPrefs get() = getSharedPreferences("lock_attempts", MODE_PRIVATE)
@@ -61,6 +63,8 @@ class LockActivity : AppCompatActivity() {
         val prefs = getSharedPreferences("prefs", MODE_PRIVATE)
         method = prefs.getString("security_method", "pin") ?: "pin"
         biometricsEnabled = prefs.getBoolean("biometrics_enabled", false)
+        autoUnlockPin = prefs.getBoolean("auto_unlock_pin", false)
+        pinLength = prefs.getInt("pin_length", 4)
 
         val stored = CredentialStore(this).loadSecurityHash() ?: run { finish(); return }
         salt = stored.first
@@ -134,13 +138,18 @@ class LockActivity : AppCompatActivity() {
         when (key) {
             "⌫" -> if (pinDigits.isNotEmpty()) { pinDigits.removeLast(); updateDots() }
             "✓" -> if (pinDigits.size >= 4) verifyPin()
-            else -> if (pinDigits.size < 8) { pinDigits.add(key.toInt()); updateDots() }
+            else -> if (pinDigits.size < 8) {
+                pinDigits.add(key.toInt())
+                updateDots()
+                if (autoUnlockPin && pinDigits.size == pinLength) verifyPin()
+            }
         }
     }
 
     private fun updateDots() {
         val n = pinDigits.size
-        binding.tvLockPinDots.text = "●".repeat(n) + "○".repeat(maxOf(4 - n, 0))
+        val total = if (autoUnlockPin) pinLength else maxOf(n, 4)
+        binding.tvLockPinDots.text = "●".repeat(n) + "○".repeat(maxOf(total - n, 0))
     }
 
     private fun verifyPin() {

app/src/main/java/sh/sar/basedbank/ui/home/SettingsSecurityFragment.kt

@@ -31,6 +31,15 @@ class SettingsSecurityFragment : Fragment() {
             )
         }
 
+        // Auto unlock on correct PIN (only for pin method)
+        if (prefs.getString("security_method", null) == "pin") {
+            binding.rowAutoUnlockPin.visibility = View.VISIBLE
+            binding.switchAutoUnlockPin.isChecked = prefs.getBoolean("auto_unlock_pin", false)
+            binding.switchAutoUnlockPin.setOnCheckedChangeListener { _, isChecked ->
+                prefs.edit().putBoolean("auto_unlock_pin", isChecked).apply()
+            }
+        }
+
         // Biometrics
         val canUseBiometrics = BiometricManager.from(requireContext())
             .canAuthenticate(BiometricManager.Authenticators.BIOMETRIC_WEAK) == BiometricManager.BIOMETRIC_SUCCESS

app/src/main/java/sh/sar/basedbank/ui/onboarding/SecuritySetupFragment.kt

@@ -215,9 +215,10 @@ class SecuritySetupFragment : Fragment() {
         val salt = ByteArray(16).also { SecureRandom().nextBytes(it) }
         val saltB64 = Base64.encodeToString(salt, Base64.NO_WRAP)
         val hash = pbkdf2(input, salt)
-        requireContext().getSharedPreferences("prefs", Context.MODE_PRIVATE).edit()
+        val edit = requireContext().getSharedPreferences("prefs", Context.MODE_PRIVATE).edit()
             .putString("security_method", method)
-            .apply()
+        if (method == "pin") edit.putInt("pin_length", input.length)
+        edit.apply()
         CredentialStore(requireContext()).saveSecurityHash(saltB64, hash)
     }