// lib/screens/customer_picker_modal.dart
// Version: 1.5.0 (Strict Type Handling: DB vs App Model)
import 'package:flutter/material.dart';
import 'package:flutter_contacts/flutter_contacts.dart';
import 'package:geolocator/geolocator.dart';
import 'package:uuid/uuid.dart';
import 'package:drift/drift.dart' as drift;
import '../models/app_model.dart' as app_model; // 名前を付けて区別
import '../data/database.dart' as db;
import '../main.dart';

class CustomerPickerModal extends StatefulWidget {
  final Function(app_model.Customer) onCustomerSelected;

  const CustomerPickerModal({Key? key, required this.onCustomerSelected})
    : super(key: key);

  @override
  State<CustomerPickerModal> createState() => _CustomerPickerModalState();
}

class _CustomerPickerModalState extends State<CustomerPickerModal> {
  String _searchQuery = "";
  List<db.Customers> _dbCustomers = [];
  List<app_model.Customer> _filteredCustomers = [];
  bool _isLoading = true;
  bool _isImportingFromContacts = false;
  Position? _currentPosition;

  @override
  void initState() {
    super.initState();
    _refreshData();
  }

  Future<void> _refreshData() async {
    if (!mounted) return;
    setState(() => _isLoading = true);
    try {
      _currentPosition = await _determinePosition();
      _dbCustomers = await database.select(database.customers).get();
      _applyFilterAndSort();
    } catch (e) {
      debugPrint("Data Fetch Error: $e");
    } finally {
      if (mounted) setState(() => _isLoading = false);
    }
  }

  void _applyFilterAndSort() {
    final query = _searchQuery.toLowerCase();

    // DBの型をアプリ用の型に変換しながらフィルタリング
    List<app_model.Customer> list = _dbCustomers
        .where((c) {
          return c.formalName.toLowerCase().contains(query) ||
              c.displayName.toLowerCase().contains(query);
        })
        .map(
          (c) => app_model.Customer(
            id: c.id,
            displayName: c.displayName,
            formalName: c.formalName,
            address: c.address ?? "",
            department: c.department ?? "",
          ),
        )
        .toList();

    // GPS距離でソート
    if (_currentPosition != null) {
      list.sort((a, b) {
        final dbA = _dbCustomers.firstWhere((e) => e.id == a.id);
        final dbB = _dbCustomers.firstWhere((e) => e.id == b.id);
        if (dbA.latitude == null) return 1;
        if (dbB.latitude == null) return -1;

        double distA = Geolocator.distanceBetween(
          _currentPosition!.latitude,
          _currentPosition!.longitude,
          dbA.latitude!,
          dbA.longitude!,
        );
        double distB = Geolocator.distanceBetween(
          _currentPosition!.latitude,
          _currentPosition!.longitude,
          dbB.latitude!,
          dbB.longitude!,
        );
        return distA.compareTo(distB);
      });
    }

    setState(() {
      _filteredCustomers = list;
    });
  }

  Future<Position?> _determinePosition() async {
    try {
      LocationPermission permission = await Geolocator.checkPermission();
      if (permission == LocationPermission.denied) {
        permission = await Geolocator.requestPermission();
      }
      if (permission == LocationPermission.always ||
          permission == LocationPermission.whileInUse) {
        return await Geolocator.getCurrentPosition(
          desiredAccuracy: LocationAccuracy.low,
        ).timeout(const Duration(seconds: 3));
      }
    } catch (_) {}
    return null;
  }

  void _onSearchChanged(String query) {
    _searchQuery = query;
    _applyFilterAndSort();
  }

  Future<void> _importFromPhoneContacts() async {
    setState(() => _isImportingFromContacts = true);
    try {
      if (await FlutterContacts.requestPermission(readonly: true)) {
        final contacts = await FlutterContacts.getContacts();
        if (!mounted) return;
        setState(() => _isImportingFromContacts = false);

        final Contact? selectedContact = await showModalBottomSheet<Contact>(
          context: context,
          isScrollControlled: true,
          builder: (context) => _PhoneContactListSelector(contacts: contacts),
        );

        if (selectedContact != null) {
          _showCustomerEditDialog(
            displayName: selectedContact.displayName,
            initialFormalName: selectedContact.displayName,
          );
        }
      }
    } catch (e) {
      setState(() => _isImportingFromContacts = false);
    }
  }

  void _showCustomerEditDialog({
    required String displayName,
    required String initialFormalName,
    app_model.Customer? existingCustomer,
  }) {
    final formalNameController = TextEditingController(text: initialFormalName);
    final departmentController = TextEditingController(
      text: existingCustomer?.department ?? "",
    );
    final addressController = TextEditingController(
      text: existingCustomer?.address ?? "",
    );

    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text(existingCustomer == null ? "顧客の新規登録" : "顧客情報の編集"),
        content: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                "表示名: $displayName",
                style: const TextStyle(fontSize: 12, color: Colors.grey),
              ),
              const SizedBox(height: 16),
              TextField(
                controller: formalNameController,
                decoration: const InputDecoration(
                  labelText: "請求書用 正式名称",
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 12),
              TextField(
                controller: departmentController,
                decoration: const InputDecoration(
                  labelText: "部署名",
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 12),
              TextField(
                controller: addressController,
                decoration: const InputDecoration(
                  labelText: "住所",
                  border: OutlineInputBorder(),
                ),
              ),
            ],
          ),
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: const Text("キャンセル"),
          ),
          ElevatedButton(
            onPressed: () async {
              final newId = existingCustomer?.id ?? const Uuid().v4();
              await database
                  .into(database.customers)
                  .insertOnConflictUpdate(
                    db.CustomersCompanion.insert(
                      id: newId,
                      displayName: displayName,
                      formalName: formalNameController.text.trim(),
                      department: drift.Value(departmentController.text.trim()),
                      address: drift.Value(addressController.text.trim()),
                      latitude: drift.Value(_currentPosition?.latitude),
                      longitude: drift.Value(_currentPosition?.longitude),
                      lastUpdatedAt: drift.Value(DateTime.now()),
                    ),
                  );
              if (mounted) {
                Navigator.pop(context);
                _refreshData();
              }
            },
            child: const Text("保存"),
          ),
        ],
      ),
    );
  }

  Future<void> _confirmDelete(app_model.Customer customer) async {
    final confirm = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text("顧客の削除"),
        content: Text("「${customer.formalName}」を削除しますか？"),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text("キャンセル"),
          ),
          TextButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text("削除する", style: TextStyle(color: Colors.red)),
          ),
        ],
      ),
    );

    if (confirm == true) {
      await (database.delete(
        database.customers,
      )..where((t) => t.id.equals(customer.id))).go();
      _refreshData();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Material(
      child: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    const Text(
                      "顧客マスター管理",
                      style: TextStyle(
                        fontSize: 20,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    IconButton(
                      icon: const Icon(Icons.close),
                      onPressed: () => Navigator.pop(context),
                    ),
                  ],
                ),
                const SizedBox(height: 12),
                TextField(
                  decoration: InputDecoration(
                    hintText: "検索...",
                    prefixIcon: const Icon(Icons.search),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(8),
                    ),
                  ),
                  onChanged: _onSearchChanged,
                ),
                const SizedBox(height: 12),
                SizedBox(
                  width: double.infinity,
                  child: ElevatedButton.icon(
                    onPressed: _isImportingFromContacts
                        ? null
                        : _importFromPhoneContacts,
                    icon: _isImportingFromContacts
                        ? const SizedBox(
                            width: 20,
                            height: 20,
                            child: CircularProgressIndicator(strokeWidth: 2),
                          )
                        : const Icon(Icons.contact_phone),
                    label: const Text("電話帳から新規取り込み"),
                    style: ElevatedButton.styleFrom(
                      backgroundColor: Colors.blueGrey.shade700,
                      foregroundColor: Colors.white,
                    ),
                  ),
                ),
              ],
            ),
          ),
          const Divider(),
          if (_isLoading) const LinearProgressIndicator(),
          Expanded(
            child: _filteredCustomers.isEmpty && !_isLoading
                ? const Center(child: Text("該当する顧客がいません"))
                : ListView.builder(
                    itemCount: _filteredCustomers.length,
                    itemBuilder: (context, index) {
                      final customer = _filteredCustomers[index];
                      return ListTile(
                        leading: const CircleAvatar(
                          child: Icon(Icons.business),
                        ),
                        title: Text(customer.formalName),
                        subtitle: Text(
                          customer.address.isEmpty ? "住所未設定" : customer.address,
                        ),
                        onTap: () => widget.onCustomerSelected(customer),
                        trailing: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            IconButton(
                              icon: const Icon(
                                Icons.edit,
                                color: Colors.blueGrey,
                                size: 20,
                              ),
                              onPressed: () => _showCustomerEditDialog(
                                displayName: customer.displayName,
                                initialFormalName: customer.formalName,
                                existingCustomer: customer,
                              ),
                            ),
                            IconButton(
                              icon: const Icon(
                                Icons.delete_outline,
                                color: Colors.redAccent,
                                size: 20,
                              ),
                              onPressed: () => _confirmDelete(customer),
                            ),
                          ],
                        ),
                      );
                    },
                  ),
          ),
        ],
      ),
    );
  }
}

class _PhoneContactListSelector extends StatefulWidget {
  final List<Contact> contacts;
  const _PhoneContactListSelector({required this.contacts});
  @override
  State<_PhoneContactListSelector> createState() =>
      _PhoneContactListSelectorState();
}

class _PhoneContactListSelectorState extends State<_PhoneContactListSelector> {
  List<Contact> _filtered = [];
  final _controller = TextEditingController();
  @override
  void initState() {
    super.initState();
    _filtered = widget.contacts;
  }

  @override
  Widget build(BuildContext context) {
    return FractionallySizedBox(
      heightFactor: 0.8,
      child: Column(
        children: [
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: TextField(
              controller: _controller,
              decoration: const InputDecoration(
                hintText: "電話帳検索...",
                prefixIcon: Icon(Icons.search),
              ),
              onChanged: (q) => setState(
                () => _filtered = widget.contacts
                    .where(
                      (c) =>
                          c.displayName.toLowerCase().contains(q.toLowerCase()),
                    )
                    .toList(),
              ),
            ),
          ),
          Expanded(
            child: ListView.builder(
              itemCount: _filtered.length,
              itemBuilder: (context, index) => ListTile(
                title: Text(_filtered[index].displayName),
                onTap: () => Navigator.pop(context, _filtered[index]),
              ),
            ),
          ),
        ],
      ),
    );
  }
}