Extract constants (#469)

* extract constants

* refactor constants

app/src/main/java/com/bitchat/android/util/AppConstants.kt

@@ -4,7 +4,116 @@ package com.bitchat.android.util
  * Centralized application-wide constants.
  */
 object AppConstants {
-    // Peer staleness threshold (ms). Keep consistent across mesh and sync layers.
-    const val STALE_PEER_TIMEOUT_MS: Long = 180_000L // 3 minutes
-}
+    // Packet time-to-live (hops)
+    val MESSAGE_TTL_HOPS: UByte = 7u     // Default TTL for regular packets
+    val SYNC_TTL_HOPS: UByte = 0u        // TTL for neighbor-only sync packets
 
+    object Mesh {
+        // Peer lifecycle
+        const val STALE_PEER_TIMEOUT_MS: Long = 180_000L // 3 minutes
+        const val PEER_CLEANUP_INTERVAL_MS: Long = 60_000L
+
+        // BLE connection tracking
+        const val CONNECTION_RETRY_DELAY_MS: Long = 5_000L
+        const val MAX_CONNECTION_ATTEMPTS: Int = 3
+        const val CONNECTION_CLEANUP_DELAY_MS: Long = 500L
+        const val CONNECTION_CLEANUP_INTERVAL_MS: Long = 30_000L
+        const val BROADCAST_CLEANUP_DELAY_MS: Long = 500L
+
+        // GATT client RSSI updates
+        const val RSSI_UPDATE_INTERVAL_MS: Long = 5_000L
+    }
+
+    object Sync {
+        const val CLEANUP_INTERVAL_MS: Long = 60_000L
+    }
+
+    object Fragmentation {
+        const val FRAGMENT_SIZE_THRESHOLD: Int = 512
+        const val MAX_FRAGMENT_SIZE: Int = 469
+        const val FRAGMENT_TIMEOUT_MS: Long = 30_000L
+        const val CLEANUP_INTERVAL_MS: Long = 10_000L
+    }
+
+    object Security {
+        const val MESSAGE_TIMEOUT_MS: Long = 300_000L
+        const val CLEANUP_INTERVAL_MS: Long = 300_000L
+        const val MAX_PROCESSED_MESSAGES: Int = 10_000
+        const val MAX_PROCESSED_KEY_EXCHANGES: Int = 1_000
+    }
+
+    object Noise {
+        const val REKEY_TIME_LIMIT_MS: Long = 3_600_000L // 1 hour
+        const val REKEY_MESSAGE_LIMIT_ENCRYPTION: Long = 1_000L // per session, encryption service policy
+        const val REKEY_MESSAGE_LIMIT_SESSION: Long = 10_000L // session-level ceiling
+        const val MAX_PAYLOAD_SIZE_BYTES: Int = 256
+        const val HIGH_NONCE_WARNING_THRESHOLD: Long = 1_000_000_000L
+    }
+
+    object Protocol {
+        const val COMPRESSION_THRESHOLD_BYTES: Int = 100
+    }
+
+    object StoreForward {
+        const val MESSAGE_CACHE_TIMEOUT_MS: Long = 43_200_000L // 12h
+        const val MAX_CACHED_MESSAGES: Int = 100
+        const val MAX_CACHED_MESSAGES_FAVORITES: Int = 1_000
+        const val CLEANUP_INTERVAL_MS: Long = 600_000L
+    }
+
+    object Power {
+        const val CRITICAL_BATTERY_PERCENT: Int = 10
+        const val LOW_BATTERY_PERCENT: Int = 20
+        const val MEDIUM_BATTERY_PERCENT: Int = 50
+        const val SCAN_ON_DURATION_NORMAL_MS: Long = 8_000L
+        const val SCAN_OFF_DURATION_NORMAL_MS: Long = 2_000L
+        const val SCAN_ON_DURATION_POWER_SAVE_MS: Long = 2_000L
+        const val SCAN_OFF_DURATION_POWER_SAVE_MS: Long = 8_000L
+        const val SCAN_ON_DURATION_ULTRA_LOW_MS: Long = 1_000L
+        const val SCAN_OFF_DURATION_ULTRA_LOW_MS: Long = 10_000L
+        const val MAX_CONNECTIONS_NORMAL: Int = 8
+        const val MAX_CONNECTIONS_POWER_SAVE: Int = 4
+        const val MAX_CONNECTIONS_ULTRA_LOW: Int = 2
+    }
+
+    object Nostr {
+        // Relay backoff
+        const val INITIAL_BACKOFF_INTERVAL_MS: Long = 1_000L
+        const val MAX_BACKOFF_INTERVAL_MS: Long = 300_000L
+        const val BACKOFF_MULTIPLIER: Double = 2.0
+        const val MAX_RECONNECT_ATTEMPTS: Int = 10
+
+        // Transport
+        const val READ_ACK_INTERVAL_MS: Long = 350L
+
+        // Deduplicator
+        const val DEFAULT_DEDUP_CAPACITY: Int = 10_000
+
+        // Relay subscription validation
+        const val SUBSCRIPTION_VALIDATION_INTERVAL_MS: Long = 30_000L
+    }
+
+    object Tor {
+        const val DEFAULT_SOCKS_PORT: Int = 9060
+        const val RESTART_DELAY_MS: Long = 2_000L
+        const val INACTIVITY_TIMEOUT_MS: Long = 5_000L
+        const val MAX_RETRY_ATTEMPTS: Int = 5
+        const val STOP_TIMEOUT_MS: Long = 7_000L
+    }
+
+    object UI {
+        const val MAX_NICKNAME_LENGTH: Int = 15
+        const val BASE_FONT_SIZE_SP: Int = 15
+        const val MESSAGE_DEDUP_TIMEOUT_MS: Long = 30_000L
+        const val SYSTEM_EVENT_DEDUP_TIMEOUT_MS: Long = 5_000L
+        const val ACTIVE_PEERS_NOTIFICATION_INTERVAL_MS: Long = 300_000L
+    }
+
+    object Media {
+        const val MAX_FILE_SIZE_BYTES: Long = 50L * 1024 * 1024
+    }
+
+    object Services {
+        const val SEEN_MESSAGE_MAX_IDS: Int = 10_000
+    }
+}