tboss_oa_module/lib/shared/widgets/location_picker.dart

import 'dart:async';
import 'dart:convert';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import 'package:geolocator/geolocator.dart';
import 'package:http/http.dart' as http;
import 'package:tdesign_flutter/tdesign_flutter.dart';
import '../../core/theme/app_colors_extension.dart';
import '../../core/i18n/app_localizations.dart';

class LocationResult {
  final String address;
  final double latitude;
  final double longitude;
  const LocationResult({
    required this.address,
    required this.latitude,
    required this.longitude,
  });
}

class LocationPicker extends StatefulWidget {
  final String? initialAddress;
  const LocationPicker({super.key, this.initialAddress});

  static Future<LocationResult?> show(
    BuildContext context, {
    String? initialAddress,
  }) {
    return Navigator.push(
      context,
      TDSlidePopupRoute<LocationResult>(
        slideTransitionFrom: SlideTransitionFrom.bottom,
        isDismissible: true,
        builder: (_) => LocationPicker(initialAddress: initialAddress),
      ),
    );
  }

  @override
  State<LocationPicker> createState() => _LocationPickerState();
}

class _LocationPickerState extends State<LocationPicker> {
  final _mapCtrl = MapController();
  final _searchCtrl = TextEditingController();
  LatLng _center = const LatLng(22.277, 113.565); // 珠海市区
  String _address = '';
  bool _locating = false;
  bool _searching = false;
  Timer? _debounce;
  List<_SItem> _results = [];

  static const _ak = 'rXpqWuD8jNrEzczIYzzc9Jwjqi6MVtXD';
  static const _base = 'https://api.map.baidu.com';
  static const _xPi = pi * 3000.0 / 180.0;

  /// BD-09 → GCJ-02 (高德坐标系)
  LatLng _bd2gcj(double lat, double lng) {
    final x = lng - 0.0065;
    final y = lat - 0.006;
    final z = sqrt(x * x + y * y) - 0.00002 * sin(y * _xPi);
    final theta = atan2(y, x) - 0.000003 * cos(x * _xPi);
    return LatLng(z * sin(theta), z * cos(theta));
  }

  @override
  void initState() {
    super.initState();
    if (widget.initialAddress != null && widget.initialAddress!.isNotEmpty) {
      _address = widget.initialAddress!;
      _geocode(_address);
    } else {
      _reverse(_center);
    }
  }

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

  Future<void> _geocode(String q) async {
    try {
      final u =
          '$_base/geocoding/v3/?address=${Uri.encodeComponent(q)}&output=json&ak=$_ak';
      final r = await http.get(Uri.parse(u));
      if (r.statusCode != 200) return;
      final d = json.decode(r.body);
      if (d['status'] != 0 || d['result'] == null) return;
      final loc = d['result']['location'];
      final p = _bd2gcj(loc['lat'] as double, loc['lng'] as double);
      _mapCtrl.move(p, 15);
      setState(() {
        _center = p;
        _address = q;
      });
    } catch (_) {}
  }

  Future<void> _reverse(LatLng p) async {
    try {
      final u =
          '$_base/reverse_geocoding/v3/?location=${p.latitude},${p.longitude}&coordtype=gcj02ll&output=json&ak=$_ak';
      final r = await http.get(Uri.parse(u));
      if (r.statusCode != 200) return;
      final d = json.decode(r.body);
      if (d['status'] != 0 || d['result'] == null) return;
      if (!mounted) return;
      final addr = d['result']['formatted_address'] as String?;
      if (addr != null && addr.isNotEmpty) {
        setState(() => _address = addr);
      } else {
        setState(
          () => _address =
              '${p.latitude.toStringAsFixed(6)}, ${p.longitude.toStringAsFixed(6)}',
        );
      }
    } catch (_) {}
  }

  void _search() {
    _debounce?.cancel();
    final q = _searchCtrl.text.trim();
    if (q.isEmpty) {
      setState(() {
        _results = [];
        _address = '';
        _searching = false;
      });
      return;
    }
    _address = q;
    // 中文最少 2 个字再触发搜索
    if (q.length < 2) {
      setState(() => _results = []);
      return;
    }
    _debounce = Timer(const Duration(milliseconds: 400), () {
      _doSearch(q);
    });
  }

  Future<void> _doSearch(String q) async {
    // 守卫：防止旧 Timer 带着已删除的文本触发搜索
    if (_searchCtrl.text.trim() != q) return;
    setState(() => _searching = true);
    try {
      final u =
          '$_base/place/v2/search?query=${Uri.encodeComponent(q)}&region=全国&output=json&scope=2&ak=$_ak';
      final r = await http.get(Uri.parse(u));
      if (r.statusCode != 200) return;
      final d = json.decode(r.body);
      if (d['status'] != 0 || d['results'] == null) return;
      final list = d['results'] as List;
      if (!mounted) return;
      setState(() {
        _results = list.map((e) {
          final loc = e['location'];
          final p = _bd2gcj(
            (loc['lat'] as num).toDouble(),
            (loc['lng'] as num).toDouble(),
          );
          final addr = e['address'] as String?;
          return _SItem(
            '${e['name'] ?? ''}${addr != null ? '，$addr' : ''}',
            p.latitude,
            p.longitude,
          );
        }).toList();
      });
    } catch (_) {
    } finally {
      if (mounted) setState(() => _searching = false);
    }
  }

  void _pick(_SItem item) {
    final p = LatLng(item.lat, item.lon);
    _mapCtrl.move(p, 15);
    setState(() {
      _center = p;
      _address = item.name;
      _results = [];
    });
    _searchCtrl.clear();
    FocusScope.of(context).unfocus();
  }

  Future<void> _locate() async {
    setState(() => _locating = true);
    try {
      final ok = await Geolocator.requestPermission();
      if (ok == LocationPermission.denied ||
          ok == LocationPermission.deniedForever) {
        if (mounted) {
          if (ok == LocationPermission.deniedForever) {
            _showLocateError(context);
          }
          setState(() => _locating = false);
        }
        return;
      }
      final pos = await Geolocator.getCurrentPosition(
        desiredAccuracy: LocationAccuracy.high,
        forceAndroidLocationManager: true,
        timeLimit: const Duration(seconds: 10),
      );
      final p = LatLng(pos.latitude, pos.longitude);
      _mapCtrl.move(p, 16);
      _reverse(p);
    } catch (_) {
      if (mounted) _showLocateError(context);
    }
    if (mounted) setState(() => _locating = false);
  }

  void _showLocateError(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    showDialog(
      context: context,
      useRootNavigator: true,
      builder: (ctx) => TDAlertDialog(
        content: l10n.get('locateFailed'),
        buttonStyle: TDDialogButtonStyle.text,
        rightBtn: TDDialogButtonOptions(
          title: l10n.get('confirm'),
          titleColor: colors.primary,
          action: () => Navigator.pop(ctx),
        ),
      ),
    );
  }

  void _confirm() {
    if (_address.isEmpty) return;
    Navigator.pop(
      context,
      LocationResult(
        address: _address,
        latitude: _center.latitude,
        longitude: _center.longitude,
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context);
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    return AnimatedPadding(
      padding: EdgeInsets.only(
        bottom: MediaQuery.of(context).viewInsets.bottom,
      ),
      duration: const Duration(milliseconds: 200),
      child: SafeArea(
        child: ConstrainedBox(
          constraints: BoxConstraints(
            maxHeight: MediaQuery.of(context).size.height * 0.9,
          ),
          child: Container(
            decoration: BoxDecoration(
              color: colors.bgPage,
              borderRadius: const BorderRadius.vertical(
                top: Radius.circular(16),
              ),
            ),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                // ── 拖拽指示条 ──
                Center(
                  child: Container(
                    margin: const EdgeInsets.only(top: 8, bottom: 4),
                    width: 36,
                    height: 4,
                    decoration: BoxDecoration(
                      color: colors.border,
                      borderRadius: BorderRadius.circular(2),
                    ),
                  ),
                ),
                // ── 标题栏 ──
                Padding(
                  padding: const EdgeInsets.fromLTRB(20, 8, 20, 16),
                  child: SizedBox(
                    height: 32,
                    child: Stack(
                      children: [
                        Positioned(
                          left: 0,
                          top: 0,
                          bottom: 0,
                          child: Center(
                            child: GestureDetector(
                              onTap: () => Navigator.pop(context),
                              child: Icon(
                                Icons.close,
                                size: 24,
                                color: colors.textSecondary,
                              ),
                            ),
                          ),
                        ),
                        Positioned(
                          right: 0,
                          top: 0,
                          bottom: 0,
                          child: Center(
                            child: GestureDetector(
                              onTap: _address.isNotEmpty ? _confirm : null,
                              child: Text(
                                l10n.get('confirm'),
                                style: TextStyle(
                                  color: _address.isNotEmpty
                                      ? colors.primary
                                      : colors.textPlaceholder,
                                  fontWeight: FontWeight.w600,
                                  fontSize: 16,
                                ),
                              ),
                            ),
                          ),
                        ),
                        Center(
                          child: Text(
                            l10n.get('selectLocation'),
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                            style: TextStyle(
                              fontSize: 18,
                              fontWeight: FontWeight.w600,
                              color: colors.textPrimary,
                            ),
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
                // ── 地图 ──
                Expanded(
                  child: Stack(
                    children: [
                      FlutterMap(
                        mapController: _mapCtrl,
                        options: MapOptions(
                          initialCenter: _center,
                          initialZoom: 15,
                          maxZoom: 18,
                          onMapEvent: (e) {
                            if (e is MapEventTap) {
                              FocusScope.of(context).unfocus();
                              _center = e.tapPosition;
                              _reverse(_center);
                            }
                            if (e is MapEventMoveEnd) {
                              _center = _mapCtrl.camera.center;
                              _reverse(_center);
                            }
                          },
                        ),
                        children: [
                          TileLayer(
                            urlTemplate:
                                'https://webrd0{s}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}',
                            subdomains: const ['1', '2', '3', '4'],
                            userAgentPackageName: 'com.amtxts.tboss_oa_module',
                          ),
                        ],
                      ),
                      Center(
                        child: IgnorePointer(
                          child: Column(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              if (_address.isNotEmpty)
                                Container(
                                  constraints: const BoxConstraints(
                                    maxWidth: 280,
                                  ),
                                  margin: const EdgeInsets.only(bottom: 2),
                                  padding: const EdgeInsets.symmetric(
                                    horizontal: 10,
                                    vertical: 6,
                                  ),
                                  decoration: BoxDecoration(
                                    color: Colors.white,
                                    borderRadius: BorderRadius.circular(6),
                                    boxShadow: [
                                      BoxShadow(
                                        color: Colors.black.withValues(
                                          alpha: 0.15,
                                        ),
                                        blurRadius: 6,
                                      ),
                                    ],
                                  ),
                                  child: Text(
                                    _address,
                                    maxLines: 2,
                                    overflow: TextOverflow.ellipsis,
                                    textAlign: TextAlign.center,
                                    style: TextStyle(
                                      fontSize: 13,
                                      color: colors.textPrimary,
                                      fontWeight: FontWeight.w500,
                                    ),
                                  ),
                                ),
                              const Icon(
                                Icons.location_on,
                                size: 40,
                                color: Colors.red,
                              ),
                            ],
                          ),
                        ),
                      ),
                      SafeArea(
                        child: Padding(
                          padding: const EdgeInsets.fromLTRB(12, 12, 12, 0),
                          child: Container(
                            decoration: BoxDecoration(
                              color: Colors.white,
                              borderRadius: BorderRadius.circular(8),
                              boxShadow: [
                                BoxShadow(color: Colors.black12, blurRadius: 4),
                              ],
                            ),
                            child: Column(
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                Padding(
                                  padding: const EdgeInsets.symmetric(
                                    horizontal: 12,
                                  ),
                                  child: TextField(
                                    controller: _searchCtrl,
                                    style: const TextStyle(fontSize: 16),
                                    decoration: InputDecoration(
                                      hintText: l10n.get('searchAddress'),
                                      hintStyle: TextStyle(
                                        color: colors.textPlaceholder,
                                        fontSize: 16,
                                      ),
                                      prefixIcon: const Icon(
                                        Icons.search,
                                        size: 22,
                                        color: Colors.grey,
                                      ),
                                      suffixIcon: _searching
                                          ? const Padding(
                                              padding: EdgeInsets.all(12),
                                              child: SizedBox(
                                                width: 18,
                                                height: 18,
                                                child:
                                                    CircularProgressIndicator(
                                                      strokeWidth: 2,
                                                    ),
                                              ),
                                            )
                                          : _searchCtrl.text.isNotEmpty
                                          ? IconButton(
                                              icon: const Icon(
                                                Icons.close,
                                                size: 20,
                                                color: Colors.grey,
                                              ),
                                              onPressed: () {
                                                _searchCtrl.clear();
                                                setState(() {
                                                  _results = [];
                                                  _address = '';
                                                });
                                              },
                                            )
                                          : null,
                                      border: InputBorder.none,
                                      contentPadding:
                                          const EdgeInsets.symmetric(
                                            vertical: 14,
                                          ),
                                    ),
                                    onChanged: (_) => _search(),
                                  ),
                                ),
                                if (_results.isNotEmpty)
                                  Container(
                                    constraints: const BoxConstraints(
                                      maxHeight: 200,
                                    ),
                                    child: ListView.separated(
                                      shrinkWrap: true,
                                      itemCount: _results.length,
                                      separatorBuilder: (_, _) =>
                                          const Divider(height: 1, indent: 0),
                                      itemBuilder: (_, i) => ListTile(
                                        dense: true,
                                        leading: const Icon(
                                          Icons.location_on,
                                          size: 20,
                                          color: Colors.redAccent,
                                        ),
                                        title: Text(
                                          _results[i].name,
                                          maxLines: 2,
                                          overflow: TextOverflow.ellipsis,
                                          style: const TextStyle(fontSize: 14),
                                        ),
                                        onTap: () => _pick(_results[i]),
                                      ),
                                    ),
                                  ),
                              ],
                            ),
                          ),
                        ),
                      ),
                      Positioned(
                        right: 12,
                        bottom: _address.isNotEmpty ? 70 : 32,
                        child: FloatingActionButton.small(
                          heroTag: 'loc',
                          backgroundColor: Colors.white,
                          onPressed: _locating ? null : _locate,
                          child: _locating
                              ? const SizedBox(
                                  width: 20,
                                  height: 20,
                                  child: CircularProgressIndicator(
                                    strokeWidth: 2,
                                  ),
                                )
                              : const Icon(
                                  Icons.my_location,
                                  color: Colors.blue,
                                ),
                        ),
                      ),
                      if (_address.isNotEmpty)
                        Positioned(
                          left: 0,
                          right: 0,
                          bottom: 0,
                          child: Container(
                            padding: EdgeInsets.fromLTRB(
                              16,
                              12,
                              16,
                              12 + MediaQuery.of(context).padding.bottom,
                            ),
                            color: Colors.white,
                            child: Row(
                              children: [
                                const Icon(
                                  Icons.location_on,
                                  color: Colors.red,
                                  size: 20,
                                ),
                                const SizedBox(width: 8),
                                Expanded(
                                  child: Text(
                                    _address,
                                    maxLines: 2,
                                    overflow: TextOverflow.ellipsis,
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class _SItem {
  final String name;
  final double lat;
  final double lon;
  const _SItem(this.name, this.lat, this.lon);
}