import 'dart:math' as math;
import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart' as ll;
import 'map_provider_interface.dart';

class OpenStreetMapProvider implements AppMapProvider {
  final MapController _mapController = MapController();
  ll.LatLng? _lastFollowPos;
  DateTime? _lastFollowTime;

  @override
  AppMapType get type => AppMapType.openStreetMap;

  @override
  String get name => 'OpenStreetMap';

  @override
  Widget buildMapView({
    required BuildContext context,
    required AppLatLng center,
    required double zoom,
    required List<AppMapMarker> markers,
    required List<AppPolyline> polylines,
    required bool isFollowMode,
    required MapConfig config,
    required ValueChanged<AppLatLng>? onPositionChanged,
    required VoidCallback? onUserInteraction,
  }) {
    final centerLl = ll.LatLng(center.latitude, center.longitude);

    if (isFollowMode) {
      final now = DateTime.now();
      final shouldMove = _lastFollowPos == null ||
          _lastFollowTime == null ||
          now.difference(_lastFollowTime!).inMilliseconds > 400 ||
          (centerLl.latitude - _lastFollowPos!.latitude).abs() > 0.00005 ||
          (centerLl.longitude - _lastFollowPos!.longitude).abs() > 0.00005;

      if (shouldMove) {
        _lastFollowPos = centerLl;
        _lastFollowTime = now;
        WidgetsBinding.instance.addPostFrameCallback((_) {
          try {
            _mapController.move(centerLl, zoom);
          } catch (_) {}
        });
      }
    }

    return FlutterMap(
      mapController: _mapController,
      options: MapOptions(
        initialCenter: centerLl,
        initialZoom: zoom,
        minZoom: config.minZoom,
        maxZoom: config.maxZoom,
        onPositionChanged: (position, hasGesture) {
          if (hasGesture) {
            onUserInteraction?.call();
          }
          if (onPositionChanged != null) {
            final c = position.center;
            onPositionChanged(AppLatLng(c.latitude, c.longitude));
          }
        },
      ),
      children: [
        TileLayer(
          urlTemplate: config.tileUrlTemplate,
          userAgentPackageName: 'com.example.motorcycle_dash',
        ),
        PolylineLayer(
          polylines: polylines.map((p) {
            return Polyline(
              points: p.points.map((pt) => ll.LatLng(pt.latitude, pt.longitude)).toList(),
              strokeWidth: p.width,
              color: p.color,
            );
          }).toList(),
        ),
        MarkerLayer(
          markers: markers.map((m) {
            return Marker(
              point: ll.LatLng(m.position.latitude, m.position.longitude),
              width: 50,
              height: 50,
              child: GestureDetector(
                onTap: m.onTap,
                child: Transform.rotate(
                  angle: (m.heading * math.pi) / 180.0,
                  child: m.iconWidget ??
                      const Icon(
                        Icons.navigation,
                        color: Colors.cyanAccent,
                        size: 36,
                      ),
                ),
              ),
            );
          }).toList(),
        ),
        RichAttributionWidget(
          attributions: [
            TextSourceAttribution(
              config.attributionText,
              textStyle: const TextStyle(color: Colors.white70, fontSize: 10),
            ),
          ],
        ),
      ],
    );
  }
}