fix: Sync bar ETA (#2515)

* fix: Sync bar ETA

* fix: Smooth ETA - WIP

* fix: Show disconnected status when sync disconnects

* feat: Display blocks remaining for the first five seconds and then switch to percentage

* Update

* fix: Extend duration for showing blocks remaining during sync from 5 to 15 seconds; update connectivity check to handle multiple connectivity results, and handle disconnected state while syncing

* feat: Initially display block if the a reconnection is triggered while syncing

* fix: More improvements to syncing

cw_bitcoin/lib/electrum_wallet.dart

@@ -2657,9 +2657,8 @@ abstract class ElectrumWalletBase
 
         break;
       case electrum.ConnectionStatus.disconnected:
-        if (syncStatus is! NotConnectedSyncStatus &&
-            syncStatus is! ConnectingSyncStatus &&
-            syncStatus is! SyncronizingSyncStatus) {
+        // Always show disconnected status when connection is lost, regardless of current sync state
+        if (syncStatus is! NotConnectedSyncStatus) {
           syncStatus = NotConnectedSyncStatus();
         }
         break;

cw_core/lib/sync_status.dart

@@ -21,6 +21,7 @@ class StartingScanSyncStatus extends SyncStatus {
 class SyncingSyncStatus extends SyncStatus {
   SyncingSyncStatus(this.blocksLeft, this.ptc) {
     updateEtaHistory(blocksLeft);
+    _globalSyncStartTime ??= DateTime.now();
   }
 
   double ptc;
@@ -32,6 +33,19 @@ class SyncingSyncStatus extends SyncStatus {
   @override
   String toString() => '$blocksLeft';
 
+  /// Returns true if we should show blocks remaining instead of percentage
+  /// Shows blocks remaining for the first 15 seconds of syncing
+  bool shouldShowBlocksRemaining() {
+    if (_globalSyncStartTime == null) return true;
+    final elapsed = DateTime.now().difference(_globalSyncStartTime!);
+    return elapsed.inSeconds < 15;
+  }
+
+  /// Reset the global sync start time (call when sync completes or fails)
+  static void resetSyncStartTime() {
+    _globalSyncStartTime = null;
+  }
+
   factory SyncingSyncStatus.fromHeightValues(int chainTip, int initialSyncHeight, int syncHeight) {
     final track = chainTip - initialSyncHeight;
     final diff = track - (chainTip - syncHeight);
@@ -45,21 +59,14 @@ class SyncingSyncStatus extends SyncStatus {
 
   static void updateEtaHistory(int blocksLeft) {
     blockHistory[DateTime.now()] = blocksLeft;
-
-    // keep only the last 30 entries (gives us better statistical accuracy)
-    while (blockHistory.length > 30) {
-      blockHistory.remove(blockHistory.keys.first);
-    }
   }
 
   static Map<DateTime, int> blockHistory = {};
   static Duration? lastEtaDuration;
   static const int _minDataPoints = 3;
-  static const int _maxDataAgeMinutes = 2;
+  static DateTime? _globalSyncStartTime;
 
   String? getFormattedEtaWithPlaceholder() {
-    _cleanOldEntries();
-
     // If we have enough data, show actual ETA
     if (blockHistory.length >= _minDataPoints) {
       final eta = getFormattedEta();
@@ -70,11 +77,6 @@ class SyncingSyncStatus extends SyncStatus {
     return '--:--';
   }
 
-  void _cleanOldEntries() {
-    final cutoffTime = DateTime.now().subtract(Duration(minutes: _maxDataAgeMinutes));
-    blockHistory.removeWhere((key, value) => key.isBefore(cutoffTime));
-  }
-
   String? getFormattedEta() {
     Duration? duration = getEtaDuration();
 

lib/core/sync_status_title.dart

@@ -4,6 +4,20 @@ import 'package:cw_core/sync_status.dart';
 
 String syncStatusTitle(SyncStatus syncStatus, SyncStatusDisplayMode syncStatusDisplayMode) {
   if (syncStatus is SyncingSyncStatus) {
+    // Show blocks remaining for the first 3 seconds, then switch to percentage
+    if (syncStatus.shouldShowBlocksRemaining()) {
+      if (syncStatus.blocksLeft == 1) {
+        return S.current.block_remaining;
+      }
+      return S.current.Blocks_remaining('${syncStatus.blocksLeft}');
+    }
+
+    // After 3 seconds, show percentage-based display
+    // Don't show ETA for very few blocks (less than 100) to avoid inconsistency
+    if (syncStatus.blocksLeft < 100) {
+      return S.current.Blocks_remaining('${syncStatus.blocksLeft}');
+    }
+
     if (syncStatus.blocksLeft == 1) {
       return S.current.block_remaining;
     }

lib/reactions/check_connection.dart

@@ -1,6 +1,5 @@
 import 'dart:async';
 
-import 'package:cake_wallet/src/screens/base_page.dart';
 import 'package:cake_wallet/utils/tor.dart';
 import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:cw_core/utils/print_verbose.dart';
@@ -8,8 +7,6 @@ import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/sync_status.dart';
 import 'package:cw_core/wallet_type.dart';
 import 'package:cake_wallet/store/settings_store.dart';
-import 'package:flutter/material.dart';
-import 'package:get_it/get_it.dart';
 
 Timer? _checkConnectionTimer;
 
@@ -29,7 +26,7 @@ void startCheckConnectionReaction(WalletBase wallet, SettingsStore settingsStore
     try {
       final connectivityResult = await (Connectivity().checkConnectivity());
 
-      if (connectivityResult == ConnectivityResult.none) {
+      if (connectivityResult.contains(ConnectivityResult.none)) {
         wallet.syncStatus = FailedSyncStatus();
         return;
       }

lib/reactions/on_current_wallet_change.dart

@@ -11,6 +11,7 @@ import 'package:cake_wallet/solana/solana.dart';
 import 'package:cake_wallet/tron/tron.dart';
 import 'package:cake_wallet/utils/tor.dart';
 import 'package:cw_core/crypto_currency.dart';
+import 'package:cw_core/sync_status.dart';
 import 'package:cw_core/transaction_history.dart';
 import 'package:cw_core/balance.dart';
 import 'package:cw_core/transaction_info.dart';
@@ -92,6 +93,7 @@ void startCurrentWalletChangeReaction(
       }
       
       await wallet.connectToNode(node: node);
+      SyncingSyncStatus.blockHistory.clear();
       if (wallet.type == WalletType.nano || wallet.type == WalletType.banano) {
         final powNode = settingsStore.getCurrentPowNode(wallet.type);
         await wallet.connectToPowNode(node: powNode);

lib/reactions/on_wallet_sync_status_change.dart

@@ -19,13 +19,23 @@ void startWalletSyncStatusChangeReaction(
   _onWalletSyncStatusChangeReaction = reaction((_) => wallet.syncStatus, (SyncStatus status) async {
     try {
       if (status is ConnectedSyncStatus) {
+        SyncingSyncStatus.resetSyncStartTime();
         await wallet.startSync();
       }
+
       if (status is SyncingSyncStatus || status is ProcessingSyncStatus) {
         await WakelockPlus.enable();
       }
-      if (status is SyncedSyncStatus || status is FailedSyncStatus) {
+
+      if (status is SyncedSyncStatus) {
         await WakelockPlus.disable();
+        SyncingSyncStatus.resetSyncStartTime();
+        SyncingSyncStatus.blockHistory.clear();
+      }
+
+      if (status is FailedSyncStatus) {
+        await WakelockPlus.disable();
+        SyncingSyncStatus.resetSyncStartTime();
       }
 
       if (status is SyncedSyncStatus &&