initial commit

lib/providers/contacts_provider.dart

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+import 'dart:async';
+import 'dart:typed_data';
+import 'package:flutter/foundation.dart';
+import '../models/contact.dart';
+import '../models/contact_telemetry.dart';
+import '../services/cayenne_lpp_parser.dart';
+
+/// Contacts Provider - manages contact list and telemetry
+class ContactsProvider with ChangeNotifier {
+  final Map<String, Contact> _contacts = {};
+
+  List<Contact> get contacts => _contacts.values.toList();
+
+  List<Contact> get chatContacts =>
+      contacts.where((c) => c.isChat).toList()..sort(_sortByLastSeen);
+
+  List<Contact> get repeaters =>
+      contacts.where((c) => c.isRepeater).toList()..sort(_sortByLastSeen);
+
+  List<Contact> get rooms =>
+      contacts.where((c) => c.isRoom).toList()..sort(_sortByLastSeen);
+
+  /// Get contacts with location (for map display)
+  List<Contact> get contactsWithLocation =>
+      contacts.where((c) => c.displayLocation != null).toList();
+
+  /// Get chat contacts with location (team members on map)
+  List<Contact> get chatContactsWithLocation =>
+      chatContacts.where((c) => c.displayLocation != null).toList();
+
+  /// Sort contacts by last seen (most recent first)
+  int _sortByLastSeen(Contact a, Contact b) {
+    return b.lastSeenTime.compareTo(a.lastSeenTime);
+  }
+
+  /// Add or update a contact
+  void addOrUpdateContact(Contact contact) {
+    _contacts[contact.publicKeyHex] = contact;
+    notifyListeners();
+  }
+
+  /// Add multiple contacts
+  void addContacts(List<Contact> contacts) {
+    for (final contact in contacts) {
+      _contacts[contact.publicKeyHex] = contact;
+    }
+    notifyListeners();
+  }
+
+  /// Update contact telemetry
+  void updateTelemetry(Uint8List publicKeyPrefix, Uint8List lppData) {
+    // Find contact by public key prefix
+    final contact = _findContactByPrefix(publicKeyPrefix);
+    if (contact == null) return;
+
+    try {
+      // Parse Cayenne LPP data
+      final telemetry = CayenneLppParser.parse(lppData);
+
+      // Update contact with new telemetry
+      final updatedContact = contact.copyWith(telemetry: telemetry);
+      _contacts[contact.publicKeyHex] = updatedContact;
+      notifyListeners();
+    } catch (e) {
+      debugPrint('Failed to parse telemetry: $e');
+    }
+  }
+
+  /// Find contact by public key prefix (6 bytes)
+  Contact? _findContactByPrefix(Uint8List prefix) {
+    if (prefix.length < 6) return null;
+
+    final prefixHex = prefix
+        .sublist(0, 6)
+        .map((b) => b.toRadixString(16).padLeft(2, '0'))
+        .join('');
+
+    for (final contact in contacts) {
+      if (contact.publicKeyHex.startsWith(prefixHex)) {
+        return contact;
+      }
+    }
+    return null;
+  }
+
+  /// Find contact by public key
+  Contact? findContactByKey(Uint8List publicKey) {
+    final keyHex =
+        publicKey.map((b) => b.toRadixString(16).padLeft(2, '0')).join('');
+    return _contacts[keyHex];
+  }
+
+  /// Find contact by name
+  Contact? findContactByName(String name) {
+    return contacts.firstWhere(
+      (c) => c.advName == name,
+      orElse: () => contacts.first,
+    );
+  }
+
+  /// Get contacts with low battery
+  List<Contact> get lowBatteryContacts {
+    return contacts.where((c) {
+      final battery = c.displayBattery;
+      return battery != null && battery < 20.0;
+    }).toList();
+  }
+
+  /// Get recently seen contacts (within last 10 minutes)
+  List<Contact> get recentlySeenContacts {
+    return contacts.where((c) => c.isRecentlySeen).toList();
+  }
+
+  /// Clear all contacts
+  void clearContacts() {
+    _contacts.clear();
+    notifyListeners();
+  }
+
+  /// Remove a contact
+  void removeContact(String publicKeyHex) {
+    _contacts.remove(publicKeyHex);
+    notifyListeners();
+  }
+
+  /// Get contact count by type
+  Map<String, int> get contactCounts {
+    return {
+      'chat': chatContacts.length,
+      'repeater': repeaters.length,
+      'room': rooms.length,
+      'total': contacts.length,
+    };
+  }
+}