import 'package:dialer/services/obfuscate_service.dart';
import 'package:dialer/widgets/username_color_generator.dart';
import 'package:flutter/material.dart';
import 'package:flutter_contacts/flutter_contacts.dart';
import '../contact_state.dart';
import 'add_contact_button.dart';
import 'contact_modal.dart';
import 'share_own_qr.dart';

class AlphabetScrollPage extends StatefulWidget {
  final double scrollOffset;
  final List<Contact> contacts;

  const AlphabetScrollPage({
    super.key,
    required this.scrollOffset,
    required this.contacts,
  });

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

class _AlphabetScrollPageState extends State<AlphabetScrollPage> {
  late ScrollController _scrollController;

  final ObfuscateService _obfuscateService = ObfuscateService();

  @override
  void initState() {
    super.initState();
    _scrollController = ScrollController(initialScrollOffset: widget.scrollOffset);
    _scrollController.addListener(_onScroll);
  }

  void _onScroll() {
    final contactState = ContactState.of(context);
    contactState.setScrollOffset(_scrollController.offset);
  }

  Future<void> _refreshContacts() async {
    final contactState = ContactState.of(context);
    try {
      await contactState.fetchContacts();
    } catch (e) {
      print('Error refreshing contacts: $e');
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to refresh contacts')),
      );
    }
  }

  void _toggleFavorite(Contact contact) async {
    try {
      if (await FlutterContacts.requestPermission()) {
        Contact? fullContact = await FlutterContacts.getContact(contact.id,
            withProperties: true,
            withAccounts: true,
            withPhoto: true,
            withThumbnail: true);

        if (fullContact != null) {
          fullContact.isStarred = !fullContact.isStarred;
          await FlutterContacts.updateContact(fullContact);
        }
        await _refreshContacts();
      } else {
        print("Could not fetch contact details");
      }
    } catch (e) {
      print("Error updating favorite status: $e");
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Failed to update contact favorite status')),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final contacts = widget.contacts;
    final selfContact = ContactState.of(context).selfContact;

    Map<String, List<Contact>> alphabetizedContacts = {};
    for (var contact in contacts) {
      String firstLetter = contact.displayName.isNotEmpty
          ? contact.displayName[0].toUpperCase()
          : '#';
      if (!alphabetizedContacts.containsKey(firstLetter)) {
        alphabetizedContacts[firstLetter] = [];
      }
      alphabetizedContacts[firstLetter]!.add(contact);
    }

    List<String> alphabetKeys = alphabetizedContacts.keys.toList()..sort();

    return Scaffold(
      backgroundColor: Colors.black,
      body: Column(
        children: [
          // Top buttons row
          Container(
            color: Colors.black,
            padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                AddContactButton(),
                QRCodeButton(contacts: contacts, selfContact: selfContact),
              ],
            ),
          ),
          // Contact List
          Expanded(
            child: ListView.builder(
              controller: _scrollController,
              itemCount: alphabetKeys.length,
              itemBuilder: (context, index) {
                String letter = alphabetKeys[index];
                List<Contact> contactsForLetter = alphabetizedContacts[letter]!;
                return Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    // Alphabet Letter Header
                    Padding(
                      padding: const EdgeInsets.symmetric(
                          vertical: 8.0, horizontal: 16.0),
                      child: Text(
                        letter,
                        style: const TextStyle(
                          fontSize: 28,
                          fontWeight: FontWeight.bold,
                          color: Colors.white,
                        ),
                      ),
                    ),
                    // Contact Entries
                    ...contactsForLetter.map((contact) {
                      String phoneNumber = contact.phones.isNotEmpty
                          ? _obfuscateService.obfuscateData(contact.phones.first.number)
                          : 'No phone number';
                      Color avatarColor =
                      generateColorFromName(contact.displayName);
                      return ListTile(
                        leading: ObfuscatedAvatar(
                          imageBytes: contact.thumbnail,
                          radius: 25,
                          backgroundColor: avatarColor,
                          fallbackInitial: contact.displayName,
                        ),
                        title: Text(
                          _obfuscateService.obfuscateData(contact.displayName),
                          style: const TextStyle(color: Colors.white),
                        ),
                        subtitle: Text(
                          phoneNumber,
                          style: const TextStyle(color: Colors.white70),
                        ),
                        onTap: () {
                          showModalBottomSheet(
                            context: context,
                            isScrollControlled: true,
                            backgroundColor: Colors.transparent,
                            builder: (context) {
                              return ContactModal(
                                contact: contact,
                                onEdit: () async {
                                  if (await FlutterContacts.requestPermission()) {
                                    final updatedContact =
                                    await FlutterContacts.openExternalEdit(
                                        contact.id);
                                    if (updatedContact != null) {
                                      await _refreshContacts();
                                      Navigator.of(context).pop();
                                      ScaffoldMessenger.of(context)
                                          .showSnackBar(
                                        SnackBar(
                                          content: Text(
                                              '${contact.displayName} updated successfully!'),
                                        ),
                                      );
                                    } else {
                                      ScaffoldMessenger.of(context)
                                          .showSnackBar(
                                        SnackBar(
                                          content:
                                          Text('Edit canceled or failed.'),
                                        ),
                                      );
                                    }
                                  }
                                },
                                onToggleFavorite: () {
                                  _toggleFavorite(contact);
                                },
                                isFavorite: contact.isStarred,
                              );
                            },
                          );
                        },
                      );
                    }),
                  ],
                );
              },
            ),
          ),
        ],
      ),
    );
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }
}