import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import '../../core/i18n/app_localizations.dart';
import '../../core/theme/app_colors_extension.dart';

class TripRouteCard extends StatelessWidget {
  final String originLabel;
  final String destLabel;
  final double? originLat;
  final double? originLng;
  final double? destLat;
  final double? destLng;

  const TripRouteCard({
    super.key,
    required this.originLabel,
    required this.destLabel,
    this.originLat,
    this.originLng,
    this.destLat,
    this.destLng,
  });

  bool get _hasCoords =>
      originLat != null &&
      originLng != null &&
      destLat != null &&
      destLng != null &&
      (originLat! != 0 || originLng! != 0) &&
      (destLat! != 0 || destLng! != 0) &&
      // 起终点重合会使 flutter_map 计算出 Infinity/NaN zoom 而崩溃（瓦片层 round 报错），隐藏地图
      (originLat != destLat || originLng != destLng);

  LatLng get _origin => LatLng(originLat!, originLng!);
  LatLng get _dest => LatLng(destLat!, destLng!);

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        _buildTextCard(context, colors),
        if (_hasCoords) ...[const SizedBox(height: 20), _buildMapCard(colors)],
      ],
    );
  }

  Widget _buildTextCard(BuildContext context, AppColorsExtension colors) {
    return Column(
      children: [
        GestureDetector(
          onLongPress: () => _copyToClipboard(context, originLabel),
          child: _bubble(
            originLabel,
            Icons.trip_origin,
            colors.primary,
            colors,
          ),
        ),
        Padding(
          padding: const EdgeInsets.only(left: 9),
          child: Column(
            children: List.generate(
              3,
              (_) => Padding(
                padding: const EdgeInsets.symmetric(vertical: 3),
                child: Container(
                  width: 2,
                  height: 2,
                  decoration: BoxDecoration(
                    color: colors.textPlaceholder,
                    shape: BoxShape.circle,
                  ),
                ),
              ),
            ),
          ),
        ),
        GestureDetector(
          onLongPress: () => _copyToClipboard(context, destLabel),
          child: _bubble(destLabel, Icons.location_on, colors.danger, colors),
        ),
      ],
    );
  }

  void _copyToClipboard(BuildContext context, String text) {
    final l10n = AppLocalizations.of(context);
    Clipboard.setData(ClipboardData(text: text));
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Center(child: Text(l10n.get('copiedToClipboard'))),
        duration: const Duration(seconds: 1),
        behavior: SnackBarBehavior.floating,
        width: 120,
      ),
    );
  }

  Widget _bubble(
    String label,
    IconData icon,
    Color color,
    AppColorsExtension colors,
  ) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.08),
        borderRadius: BorderRadius.circular(8),
      ),
      child: Row(
        children: [
          Icon(icon, size: 18, color: color),
          const SizedBox(width: 10),
          Expanded(
            child: Text(
              label,
              maxLines: 2,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.w500,
                color: colors.textPrimary,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMapCard(AppColorsExtension colors) {
    final dist = const Distance().as(LengthUnit.Kilometer, _origin, _dest);
    final mid = LatLng(
      (_origin.latitude + _dest.latitude) / 2,
      (_origin.longitude + _dest.longitude) / 2,
    );
    final distText = dist >= 1
        ? '${dist.toStringAsFixed(1)}km'
        : '${(dist * 1000).toInt()}m';

    return Container(
      height: 200,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: colors.border, width: 0.5),
      ),
      clipBehavior: Clip.antiAlias,
      child: FlutterMap(
        options: MapOptions(
          initialCameraFit: CameraFit.bounds(
            bounds: LatLngBounds.fromPoints([_origin, _dest]),
            padding: const EdgeInsets.all(40),
            // 高德瓦片最大 18 级：两点极近时 fit 出的 zoom 超限会导致瓦片 404，整图空白
            maxZoom: 18,
          ),
        ),
        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',
          ),
          PolylineLayer(
            polylines: [
              Polyline(
                points: [_origin, _dest],
                color: colors.primary.withValues(alpha: 0.8),
                strokeWidth: 3,
              ),
            ],
          ),
          MarkerLayer(
            markers: [
              Marker(
                point: _origin,
                width: 180,
                height: 32,
                child: _mapLabel(
                  originLabel,
                  Icons.trip_origin,
                  colors.primary,
                  colors.textPrimary,
                ),
              ),
              Marker(
                point: _dest,
                width: 180,
                height: 32,
                child: _mapLabel(
                  destLabel,
                  Icons.location_on,
                  colors.danger,
                  colors.textPrimary,
                ),
              ),
              Marker(
                point: mid,
                width: 80,
                height: 24,
                child: _distBadge(distText, colors),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _distBadge(String text, AppColorsExtension colors) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      alignment: Alignment.center,
      decoration: BoxDecoration(
        color: colors.primary.withValues(alpha: 0.85),
        borderRadius: BorderRadius.circular(10),
      ),
      child: Text(
        text,
        textAlign: TextAlign.center,
        style: const TextStyle(
          fontSize: 10,
          color: Colors.white,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }

  Widget _mapLabel(
    String text,
    IconData icon,
    Color iconColor,
    Color textColor,
  ) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(4),
        boxShadow: [
          BoxShadow(color: Colors.black.withValues(alpha: 0.2), blurRadius: 4),
        ],
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(icon, size: 12, color: iconColor),
          const SizedBox(width: 2),
          Flexible(
            child: Text(
              text,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(fontSize: 10, color: textColor),
            ),
          ),
        ],
      ),
    );
  }
}