import 'package:flutter_contacts/flutter_contacts.dart';
import 'package:get/get.dart';

class ContactInfo {
  final String name;
  final String? avatarPath;
  ContactInfo({required this.name, this.avatarPath});
}

class ContactsService extends GetxService {
  final RxMap<String, ContactInfo> _contactsMap = <String, ContactInfo>{}.obs;
  final RxBool permissionGranted = false.obs;

  Future<ContactsService> init() async {
    await fetchContacts();
    return this;
  }

  Future<void> fetchContacts() async {
    try {
      // Check and request permission
      bool permission = await FlutterContacts.requestPermission(readonly: true);
      permissionGranted.value = permission;

      if (permission) {
        // Fetch contacts with photos and phone numbers
        final contacts = await FlutterContacts.getContacts(withProperties: true, withPhoto: true);
        
        final Map<String, ContactInfo> tempMap = {};
        for (var contact in contacts) {
          final fullName = contact.displayName;
          if (fullName.isEmpty) continue;

          for (var phone in contact.phones) {
            final normalized = normalizePhoneNumber(phone.number);
            if (normalized.isNotEmpty) {
              tempMap[normalized] = ContactInfo(
                name: fullName,
                avatarPath: null, // Custom local avatar path can be handled if needed
              );
            }
          }
        }
        _contactsMap.assignAll(tempMap);
        print('[CONTACTS] Successfully loaded ${_contactsMap.length} normalized phone contacts');
      }
    } catch (e) {
      print('[CONTACTS ERROR] Failed to fetch system contacts: $e');
    }
  }

  // Normalizes numbers to match them easily (e.g., removes spaces, dashes, brackets, and leading zeros)
  String normalizePhoneNumber(String number) {
    String clean = number.replaceAll(RegExp(r'[\s\-\(\)\+]'), '');
    // If it starts with local country prefix or leading 0, we can do substring matches
    if (clean.startsWith('00')) {
      clean = clean.substring(2);
    }
    return clean;
  }

  String getContactName(String rawNumber, String fallback) {
    if (!permissionGranted.value || _contactsMap.isEmpty) return fallback;

    final clean = normalizePhoneNumber(rawNumber);
    if (clean.isEmpty) return fallback;

    // Direct match
    if (_contactsMap.containsKey(clean)) {
      return _contactsMap[clean]!.name;
    }

    // Partial match for varying country codes (match last 9 digits of the phone number)
    if (clean.length >= 9) {
      final suffix = clean.substring(clean.length - 9);
      for (var key in _contactsMap.keys) {
        if (key.endsWith(suffix)) {
          return _contactsMap[key]!.name;
        }
      }
    }

    return fallback;
  }
}