import 'package:dialer/features/contacts/contact_state.dart';
import 'package:dialer/features/contacts/widgets/alphabet_scroll_page.dart';
import 'package:flutter/material.dart';
import 'package:dialer/widgets/loading_indicator.dart';
import 'package:flutter_contacts/flutter_contacts.dart';

const bool _privacyMode = bool.fromEnvironment('privacy-mode', defaultValue: false);

List<Contact> _maskContacts(List<Contact> original) {
  if (!_privacyMode) return original;
  return original.map((c) {
    final maskedName = _maskName(c.displayName);
    final phones = c.phones.map((p) => Phone(
      _maskPhone(p.number),
      label: p.label,
    )).toList();
    final masked = Contact()
      ..displayName = maskedName
      ..thumbnail = c.thumbnail
      ..phones = phones
      ..id = c.id;
    return masked;
  }).toList();
}

String _maskName(String name) {
  final parts = name.split(' ');
  return parts.map((part) {
    if (part.length < 2) return part;
    return '${part[0]}${'*' * (part.length - 1)}';
  }).join(' ');
}

String _maskPhone(String phone) {
  if (phone.length < 3) return phone;
  return phone.substring(0, 2) + '*' * (phone.length - 2);
}

class ContactPage extends StatefulWidget {
  const ContactPage({super.key});

  @override
  _ContactPageState createState() => _ContactPageState();
}

class _ContactPageState extends State<ContactPage> {
  @override
  Widget build(BuildContext context) {
    final contactState = ContactState.of(context);
    return Scaffold(
      body: contactState.loading
          ? const LoadingIndicatorWidget()
          : AlphabetScrollPage(
              scrollOffset: contactState.scrollOffset,
              contacts: _maskContacts(contactState.contacts),
            ),
    );
  }
}