import 'package:flutter/material.dart';
import 'package:friendly_map/modules/app/app.dart';

import '../app_scope.dart';
import '../theme.dart';
import '../widgets/common.dart';
import '../widgets/pin_dialog.dart';

/// 휴대폰 주소록에서 사람을 골라(한 명·여러 명·거른 사람 모두) 인맥과 그룹에 넣는다.
/// [groupId] 를 주면 그 그룹이 미리 골라져 있다.
class ContactImportScreen extends StatefulWidget {
  const ContactImportScreen({super.key, this.groupId});

  final String? groupId;

  @override
  State<ContactImportScreen> createState() => _ContactImportScreenState();
}

class _ContactImportScreenState extends State<ContactImportScreen> {
  List<ContactCandidate>? _all;
  bool _denied = false;
  String _query = '';
  String? _label;
  bool _hideKnown = false;
  final Set<String> _picked = {}; // 주소록 번호표
  bool _busy = false;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_all == null && !_busy) _load();
  }

  Future<void> _load() async {
    final svc = AppScope.of(context).app.contacts;
    _busy = true;
    final allowed = svc.available && await svc.requestPermission();
    final list = allowed ? await svc.load() : const <ContactCandidate>[];
    if (!mounted) return;
    setState(() {
      _busy = false;
      _denied = !allowed;
      _all = list;
      _picked.removeWhere((id) => !list.any((c) => c.contact.id == id));
    });
  }

  List<ContactCandidate> get _shown =>
      ContactImportService.filter(_all ?? const [], ContactFilter(query: _query, label: _label, hideKnown: _hideKnown));

  Future<void> _import() async {
    final app = AppScope.of(context).app;
    final picked = [for (final c in _all ?? const <ContactCandidate>[]) if (_picked.contains(c.contact.id)) c];
    final opts = await showModalBottomSheet<_Options>(
      context: context,
      showDragHandle: true,
      isScrollControlled: true,
      builder: (_) => _OptionsSheet(count: picked.length, preset: widget.groupId),
    );
    if (opts == null || !mounted) return;
    setState(() => _busy = true);
    final r = await app.contacts.import(picked, groupIds: opts.groups, sendRequest: opts.request);
    if (!mounted) return;
    _picked.clear();
    final parts = [
      if (r.added > 0) '새로 ${r.added}명',
      if (r.existing > 0) '이미 있던 ${r.existing}명',
      if (r.skipped > 0) '건너뜀 ${r.skipped}명',
      if (r.requested > 0) '친구 요청 ${r.requested}명',
    ];
    showNote(context, parts.isEmpty ? '가져온 사람이 없어요' : '가져왔어요: ${parts.join(', ')}');
    await _load();
  }

  @override
  Widget build(BuildContext context) {
    final svc = AppScope.of(context).app.contacts;
    final all = _all;
    Widget body;
    if (!svc.available) {
      body = const EmptyNote('이 기기에서는 주소록을 읽을 수 없어요.');
    } else if (all == null) {
      body = const Center(child: CircularProgressIndicator());
    } else if (_denied) {
      body = Column(mainAxisAlignment: MainAxisAlignment.center, children: [
        const EmptyNote('주소록을 읽을 권한이 없어요.\n휴대폰 설정에서 연락처 권한을 허용해 주세요.'),
        OutlinedButton(onPressed: _load, child: const Text('다시 묻기')),
      ]);
    } else {
      body = _list(all);
    }
    return Scaffold(
      appBar: AppBar(title: const Text('주소록에서 가져오기')),
      body: body,
      bottomNavigationBar: _picked.isEmpty
          ? null
          : SafeArea(
              child: Padding(
                padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
                child: SizedBox(
                  height: 48,
                  child: FilledButton(onPressed: _busy ? null : _import, child: Text('${_picked.length}명 가져오기')),
                ),
              ),
            ),
    );
  }

  Widget _list(List<ContactCandidate> all) {
    final shown = _shown;
    final pickable = [for (final c in shown) if (c.importable) c.contact.id];
    final allPicked = pickable.isNotEmpty && pickable.every(_picked.contains);
    final labels = ContactImportService.labels(all);
    return Column(children: [
      Padding(
        padding: const EdgeInsets.fromLTRB(16, 4, 16, 6),
        child: TextField(
          decoration: const InputDecoration(hintText: '이름 · 초성(ㄱㅁㅅ) · 번호로 찾기', prefixIcon: Icon(Icons.search), isDense: true),
          onChanged: (v) => setState(() => _query = v),
        ),
      ),
      Padding(
        padding: const EdgeInsets.symmetric(horizontal: 16),
        child: Wrap(spacing: 6, runSpacing: 6, children: [
          ChoiceChip(label: const Text('전체'), selected: _label == null, onSelected: (_) => setState(() => _label = null)),
          for (final l in labels) ChoiceChip(label: Text(l), selected: _label == l, onSelected: (_) => setState(() => _label = _label == l ? null : l)),
          FilterChip(label: const Text('새 사람만'), selected: _hideKnown, onSelected: (v) => setState(() => _hideKnown = v)),
        ]),
      ),
      Padding(
        padding: const EdgeInsets.fromLTRB(20, 4, 8, 0),
        child: Row(children: [
          Expanded(child: Text('${shown.length}명 · ${_picked.length}명 고름', style: const TextStyle(fontSize: 12, color: Pal.muted))),
          TextButton(
            onPressed: pickable.isEmpty
                ? null
                : () => setState(() => allPicked ? _picked.removeAll(pickable) : _picked.addAll(pickable)),
            child: Text(allPicked ? '모두 풀기' : '모두 고르기'),
          ),
        ]),
      ),
      Expanded(
        child: shown.isEmpty
            ? const EmptyNote('맞는 사람이 없어요.')
            : ListView.builder(
                itemCount: shown.length,
                itemBuilder: (_, i) {
                  final c = shown[i];
                  final note = c.isMe
                      ? '내 번호'
                      : c.phone == null
                          ? '쓸 수 있는 번호가 없어요'
                          : c.known != null
                              ? '${displayPhone(c.phone!)} · 이미 인맥에 있어요'
                              : displayPhone(c.phone!);
                  return CheckboxListTile(
                    value: _picked.contains(c.contact.id),
                    onChanged: c.importable ? (v) => setState(() => v == true ? _picked.add(c.contact.id) : _picked.remove(c.contact.id)) : null,
                    secondary: Avatar(c.name, size: 36, color: c.known != null ? Pal.school : Pal.accent),
                    title: Text(c.name),
                    subtitle: Text(note, style: const TextStyle(fontSize: 12, color: Pal.muted)),
                  );
                },
              ),
      ),
    ]);
  }
}

class _Options {
  const _Options(this.groups, this.request);
  final Set<String> groups;
  final bool request;
}

/// 가져오기 전에: 넣을 그룹(여러 개)과 친구 요청을 보낼지 고른다.
class _OptionsSheet extends StatefulWidget {
  const _OptionsSheet({required this.count, this.preset});
  final int count;
  final String? preset;

  @override
  State<_OptionsSheet> createState() => _OptionsSheetState();
}

class _OptionsSheetState extends State<_OptionsSheet> {
  late final Set<String> _groups = {if (widget.preset != null) widget.preset!};
  bool _request = false;
  List<GroupView>? _views;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _views ?? _reload();
  }

  Future<void> _reload() async {
    final v = await AppScope.of(context).app.groups.all();
    if (mounted) setState(() => _views = v);
  }

  @override
  Widget build(BuildContext context) {
    final views = _views;
    return SafeArea(
      child: Padding(
        padding: const EdgeInsets.fromLTRB(16, 0, 16, 12),
        child: Column(mainAxisSize: MainAxisSize.min, crossAxisAlignment: CrossAxisAlignment.start, children: [
          Text('${widget.count}명을 어느 그룹에 넣을까요?', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.w700)),
          const SizedBox(height: 4),
          const Text('고르지 않으면 인맥에만 넣어요. 잠긴 그룹은 비밀번호로 연 뒤 고를 수 있어요.', style: TextStyle(fontSize: 12, color: Pal.muted)),
          const SizedBox(height: 10),
          if (views == null)
            const Center(child: CircularProgressIndicator())
          else
            Wrap(spacing: 6, runSpacing: 6, children: [
              for (final v in views)
                FilterChip(
                  avatar: v.group.locked ? Icon(v.open ? Icons.lock_open : Icons.lock, size: 16) : null,
                  label: Text(v.depth > 1 ? v.path : v.group.name),
                  selected: _groups.contains(v.group.id),
                  selectedColor: Pal.ofKind(v.group.kind).withValues(alpha: 0.3),
                  onSelected: (on) async {
                    if (on && !v.open) {
                      if (!await openGroup(context, v)) return;
                      await _reload();
                    }
                    if (!mounted) return;
                    setState(() => on ? _groups.add(v.group.id) : _groups.remove(v.group.id));
                  },
                ),
            ]),
          const SizedBox(height: 8),
          ToggleRow(
            title: '친구 요청도 보내기',
            subtitle: '끄면 이 기기 인맥에만 넣고 상대에게는 아무것도 가지 않아요',
            value: _request,
            onChanged: (v) => setState(() => _request = v),
          ),
          const SizedBox(height: 8),
          SizedBox(
            width: double.infinity,
            height: 48,
            child: FilledButton(onPressed: () => Navigator.pop(context, _Options(_groups, _request)), child: const Text('가져오기')),
          ),
        ]),
      ),
    );
  }
}