import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:get/get.dart';
import 'package:latlong2/latlong.dart';

import '../controllers/tracking_controller.dart';
import '../../../../models/track.dart';
import 'track_list_view.dart';

class TrackingView extends GetView<TrackingController> {
  const TrackingView({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      extendBody: true,
      appBar: AppBar(
        title: const Text('Nyomvonal'),
        actions: [
          IconButton(
            icon: const Icon(Icons.list_alt),
            tooltip: 'Mentett track-ek',
            onPressed: () => Get.to(() => const TrackListView()),
          ),
        ],
      ),
      body: Stack(
        children: [
          _LiveMap(),
          _StatsPanel(),
        ],
      ),
      bottomNavigationBar: _ControlBar(),
    );
  }
}

// ─── Térkép ─────────────────────────────────────────────────────────────────

class _LiveMap extends GetView<TrackingController> {
  const _LiveMap();

  @override
  Widget build(BuildContext context) {
    final mapController = MapController();

    return Obx(() {
      final points = controller.livePoints;
      final center = points.isNotEmpty
          ? points.last
          : const LatLng(47.5, 19.0); // Magyarország közepe

      // Középre követ rögzítés közben
      if (controller.isRecording.value && points.isNotEmpty) {
        WidgetsBinding.instance.addPostFrameCallback((_) {
          mapController.move(points.last, mapController.camera.zoom);
        });
      }

      return FlutterMap(
        mapController: mapController,
        options: MapOptions(
          initialCenter: center,
          initialZoom: 15.0,
          interactionOptions: const InteractionOptions(
            flags: InteractiveFlag.all,
          ),
        ),
        children: [
          TileLayer(
            urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
            userAgentPackageName: 'hu.app_dev.terepi_seged',
          ),
          if (points.length >= 2)
            PolylineLayer(
              polylines: [
                Polyline(
                  points: points,
                  color: Colors.blue.shade700,
                  strokeWidth: 4.0,
                  borderColor: Colors.blue.shade200,
                  borderStrokeWidth: 1.5,
                ),
              ],
            ),
          if (points.isNotEmpty)
            MarkerLayer(
              markers: [
                // Kezdőpont
                Marker(
                  point: points.first,
                  child: const Icon(Icons.flag, color: Colors.green, size: 28),
                ),
                // Aktuális pozíció
                Marker(
                  point: points.last,
                  child: _PulsingDot(
                    color:
                        controller.isPaused.value ? Colors.orange : Colors.blue,
                  ),
                ),
              ],
            ),
        ],
      );
    });
  }
}

/// Pulzáló pont az aktuális pozícióhoz.
class _PulsingDot extends StatefulWidget {
  final Color color;
  const _PulsingDot({required this.color});

  @override
  State<_PulsingDot> createState() => _PulsingDotState();
}

class _PulsingDotState extends State<_PulsingDot>
    with SingleTickerProviderStateMixin {
  late AnimationController _anim;
  late Animation<double> _scale;

  @override
  void initState() {
    super.initState();
    _anim = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 1000))
      ..repeat(reverse: true);
    _scale = Tween(begin: 0.8, end: 1.3)
        .animate(CurvedAnimation(parent: _anim, curve: Curves.easeInOut));
  }

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

  @override
  Widget build(BuildContext context) {
    return ScaleTransition(
      scale: _scale,
      child: Container(
        width: 18,
        height: 18,
        decoration: BoxDecoration(
          color: widget.color,
          shape: BoxShape.circle,
          border: Border.all(color: Colors.white, width: 2),
          boxShadow: [
            BoxShadow(
                color: widget.color.withOpacity(0.5),
                blurRadius: 8,
                spreadRadius: 2)
          ],
        ),
      ),
    );
  }
}

// ─── Statisztika panel ────────────────────────────────────────────────────────

class _StatsPanel extends GetView<TrackingController> {
  const _StatsPanel();

  @override
  Widget build(BuildContext context) {
    return Obx(() {
      if (!controller.isRecording.value && controller.livePoints.isEmpty) {
        return const SizedBox.shrink();
      }

      return Positioned(
        top: 12,
        left: 12,
        right: 12,
        child: Card(
          elevation: 4,
          shape:
              RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
          color: Theme.of(context).colorScheme.surface.withOpacity(0.92),
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              children: [
                _Stat(
                  icon: Icons.timer_outlined,
                  label: 'Idő',
                  value: controller.elapsedFormatted.value,
                ),
                _Divider(),
                _Stat(
                  icon: Icons.straighten,
                  label: 'Távolság',
                  value: _formatDist(controller.sessionDistance.value),
                ),
                _Divider(),
                _Stat(
                  icon: Icons.speed,
                  label: 'Sebesség',
                  value:
                      '${controller.currentSpeedKmh.value.toStringAsFixed(1)} km/h',
                ),
                _Divider(),
                _Stat(
                  icon: Icons.location_on_outlined,
                  label: 'Pontok',
                  value: controller.livePoints.length.toString(),
                ),
              ],
            ),
          ),
        ),
      );
    });
  }

  String _formatDist(double m) {
    if (m < 1000) return '${m.toStringAsFixed(0)} m';
    return '${(m / 1000).toStringAsFixed(2)} km';
  }
}

class _Stat extends StatelessWidget {
  final IconData icon;
  final String label;
  final String value;
  const _Stat({required this.icon, required this.label, required this.value});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        Icon(icon, size: 16, color: Theme.of(context).colorScheme.primary),
        const SizedBox(height: 2),
        Text(value,
            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 15)),
        Text(label,
            style: TextStyle(fontSize: 10, color: Colors.grey.shade600)),
      ],
    );
  }
}

class _Divider extends StatelessWidget {
  const _Divider();
  @override
  Widget build(BuildContext context) =>
      Container(height: 36, width: 1, color: Colors.grey.shade300);
}

// ─── Vezérlő sáv ────────────────────────────────────────────────────────────

class _ControlBar extends GetView<TrackingController> {
  const _ControlBar();

  @override
  Widget build(BuildContext context) {
    return Obx(() {
      final recording = controller.isRecording.value;
      final paused = controller.isPaused.value;

      return Container(
        decoration: BoxDecoration(
          color: Theme.of(context).colorScheme.surface,
          boxShadow: [
            BoxShadow(
                color: Colors.black.withOpacity(0.12),
                blurRadius: 8,
                offset: const Offset(0, -2))
          ],
        ),
        padding: EdgeInsets.fromLTRB(
            24, 12, 24, 12 + MediaQuery.of(context).padding.bottom),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceEvenly,
          children: [
            if (!recording) ...[
              // ── Nincs aktív track ──
              _RoundButton(
                icon: Icons.fiber_manual_record,
                label: 'Indítás',
                color: Colors.red,
                onTap: () => controller.startRecording(),
              ),
            ] else ...[
              // ── Aktív track ──
              _RoundButton(
                icon: paused ? Icons.play_arrow : Icons.pause,
                label: paused ? 'Folytatás' : 'Szünet',
                color: Colors.orange,
                onTap: paused
                    ? controller.resumeRecording
                    : controller.pauseRecording,
              ),
              // Nagy Stop gomb középen
              GestureDetector(
                onTap: () => _confirmStop(context),
                child: Container(
                  width: 68,
                  height: 68,
                  decoration: BoxDecoration(
                    color: Colors.red,
                    shape: BoxShape.circle,
                    boxShadow: [
                      BoxShadow(
                          color: Colors.red.withOpacity(0.4),
                          blurRadius: 12,
                          spreadRadius: 2)
                    ],
                  ),
                  child: const Icon(Icons.stop, color: Colors.white, size: 32),
                ),
              ),
              _RoundButton(
                icon: Icons.share,
                label: 'Export',
                color: Colors.blue,
                onTap: () {
                  final t = controller.currentTrack.value;
                  if (t != null) controller.exportTrack(t);
                },
              ),
            ],
          ],
        ),
      );
    });
  }

  Future<void> _confirmStop(BuildContext context) async {
    final ok = await showDialog<bool>(
      context: context,
      builder: (_) => AlertDialog(
        title: const Text('Track leállítása'),
        content: const Text(
            'Leállítja a rögzítést? A track automatikusan mentésre kerül.'),
        actions: [
          TextButton(
              onPressed: () => Navigator.pop(context, false),
              child: const Text('Mégse')),
          FilledButton(
              onPressed: () => Navigator.pop(context, true),
              child: const Text('Leállítás')),
        ],
      ),
    );
    if (ok == true) controller.stopRecording();
  }
}

class _RoundButton extends StatelessWidget {
  final IconData icon;
  final String label;
  final Color color;
  final VoidCallback onTap;
  const _RoundButton(
      {required this.icon,
      required this.label,
      required this.color,
      required this.onTap});

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Container(
            width: 52,
            height: 52,
            decoration: BoxDecoration(
              color: color.withOpacity(0.12),
              shape: BoxShape.circle,
              border: Border.all(color: color, width: 1.5),
            ),
            child: Icon(icon, color: color, size: 26),
          ),
          const SizedBox(height: 4),
          Text(label, style: TextStyle(fontSize: 11, color: color)),
        ],
      ),
    );
  }
}