added ledger as souec of funds for payouts

frontend/pweb/lib/pages/dashboard/buttons/balance/controller.dart

@@ -1,21 +1,124 @@
 import 'package:flutter/foundation.dart';
 
+import 'package:pshared/controllers/balance_mask/wallets.dart';
+import 'package:pshared/provider/ledger.dart';
 
-class CarouselIndexController with ChangeNotifier {
+import 'package:pweb/pages/dashboard/buttons/balance/balance_item.dart';
+
+class BalanceCarouselController with ChangeNotifier {
+  WalletsController? _walletsController;
+  List<BalanceItem> _items = const <BalanceItem>[BalanceItem.addAction()];
   int _index = 0;
 
+  List<BalanceItem> get items => _items;
   int get index => _index;
 
-  void setIndex(int value, int max) {
-    final next = value.clamp(0, max > 0 ? max - 1 : 0);
-    if (next == _index) return;
+  void update({
+    required WalletsController walletsController,
+    required LedgerAccountsProvider ledgerProvider,
+  }) {
+    _walletsController = walletsController;
+
+    final nextItems = <BalanceItem>[
+      ...walletsController.wallets.map(BalanceItem.wallet),
+      ...ledgerProvider.accounts.map(BalanceItem.ledger),
+      const BalanceItem.addAction(),
+    ];
+
+    final nextIndex = _resolveNextIndex(nextItems, walletsController);
+    final hasItemsChanged = !_isSameItems(_items, nextItems);
+    final hasIndexChanged = _index != nextIndex;
+
+    _items = nextItems;
+    _index = nextIndex;
+
+    if (hasItemsChanged || hasIndexChanged) {
+      notifyListeners();
+    }
+  }
+
+  void onPageChanged(int value) {
+    final next = _clampIndex(value, _items.length);
+    if (_index == next) {
+      _syncSelectedWallet();
+      return;
+    }
+
     _index = next;
+    _syncSelectedWallet();
     notifyListeners();
   }
 
-  void reset() {
-    if (_index == 0) return;
-    _index = 0;
-    notifyListeners();
+  void goBack() => onPageChanged(_index - 1);
+
+  void goForward() => onPageChanged(_index + 1);
+
+  int _resolveNextIndex(
+    List<BalanceItem> nextItems,
+    WalletsController walletsController,
+  ) {
+    final currentWalletRef = _currentWalletRef(_items, _index);
+    if (currentWalletRef != null) {
+      final byCurrentWallet = _walletIndexByRef(nextItems, currentWalletRef);
+      if (byCurrentWallet != null) return byCurrentWallet;
+
+      final selectedWalletRef = walletsController.selectedWalletRef;
+      final bySelectedWallet = _walletIndexByRef(nextItems, selectedWalletRef);
+      if (bySelectedWallet != null) return bySelectedWallet;
+    }
+
+    return _clampIndex(_index, nextItems.length);
+  }
+
+  String? _currentWalletRef(List<BalanceItem> items, int index) {
+    if (items.isEmpty || index < 0 || index >= items.length) return null;
+    final current = items[index];
+    if (!current.isWallet) return null;
+    return current.wallet?.id;
+  }
+
+  int? _walletIndexByRef(List<BalanceItem> items, String? walletRef) {
+    if (walletRef == null || walletRef.isEmpty) return null;
+    final idx = items.indexWhere(
+      (item) => item.isWallet && item.wallet?.id == walletRef,
+    );
+    if (idx < 0) return null;
+    return idx;
+  }
+
+  int _clampIndex(int value, int itemCount) {
+    if (itemCount <= 0) return 0;
+    return value.clamp(0, itemCount - 1);
+  }
+
+  bool _isSameItems(List<BalanceItem> left, List<BalanceItem> right) {
+    if (left.length != right.length) return false;
+
+    for (var i = 0; i < left.length; i++) {
+      final a = left[i];
+      final b = right[i];
+      if (a.type != b.type) return false;
+      if (_itemIdentity(a) != _itemIdentity(b)) return false;
+    }
+
+    return true;
+  }
+
+  String _itemIdentity(BalanceItem item) => switch (item.type) {
+    BalanceItemType.wallet => item.wallet?.id ?? '',
+    BalanceItemType.ledger => item.account?.ledgerAccountRef ?? '',
+    BalanceItemType.addAction => 'add',
+  };
+
+  void _syncSelectedWallet() {
+    final walletsController = _walletsController;
+    if (walletsController == null || _items.isEmpty) return;
+
+    final current = _items[_index];
+    if (!current.isWallet || current.wallet == null) return;
+
+    final wallet = current.wallet!;
+    if (walletsController.selectedWallet?.id == wallet.id) return;
+    walletsController.selectWallet(wallet);
   }
 }