import 'dart:io';
import 'dart:math';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:flutter_map_polywidget/flutter_map_polywidget.dart';
import 'package:get/get.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import 'package:rive/rive.dart';
import 'package:terepi_seged/pages/map_survey/presentations/controllers/map_survey_controller.dart';
import 'package:terepi_seged/pages/map_survey/presentations/views/settings_dialog.dart';
import 'package:terepi_seged/utils/rive_utils.dart';
import 'package:terepi_seged/widgets/coordinate_panel.dart';
import 'package:terepi_seged/widgets/save_point_fab.dart';
import 'package:terepi_seged/widgets/shared_map_widgets.dart';

import 'map_add_point_dialog.dart';

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

  @override
  Widget build(BuildContext context) {
    return Stack(children: [
      const SharedMapWidget(),
      Positioned(
        top: 8,
        right: 8,
        left: 8,
        child: CoordinatePanel.fromController(controller),
      ),
      Positioned(top: 8, left: 0, right: 0, child: _ModeSelector()),
      Positioned(
        bottom: 80,
        left: 8,
        right: 8,
        child: Obx(
          () => controller.mode.value == MapSurveyMode.stakeout
              ? _StakeoutPanel() // ΔY, ΔX, távolság, irányszög
              : const SizedBox.shrink(),
        ),
      ),
      Positioned(
        bottom: 16,
        right: 16,
        child: SavePointFab(controller: controller),
      ),
    ]);
  }
}

class _ModeSelector extends GetView<MapSurveyController> {
  const _ModeSelector();

  @override
  Widget build(BuildContext context) {
    return Obx(() => SegmentedButton<MapSurveyMode>(
          segments: const [
            ButtonSegment(
              value: MapSurveyMode.measure,
              icon: Icon(Icons.gps_fixed, size: 16),
              label: Text('Bemérés'),
            ),
            ButtonSegment(
              value: MapSurveyMode.stakeout,
              icon: Icon(Icons.my_location, size: 16),
              label: Text('Kitűzés'),
            ),
          ],
          selected: {controller.mode.value},
          onSelectionChanged: (s) => controller.switchMode(s.first),
        ));
  }
}

class _StakeoutPanel extends GetView<MapSurveyController> {
  const _StakeoutPanel();

  @override
  Widget build(BuildContext context) {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(12),
        child: Obx(() {
          final onTarget = controller.isOnTarget;
          return Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              // Célpont neve
              Row(children: [
                const Icon(Icons.flag, size: 16, color: Colors.orange),
                const SizedBox(width: 6),
                Text(controller.targetName.value,
                    style: const TextStyle(fontWeight: FontWeight.w600)),
                const Spacer(),
                TextButton(
                  onPressed: _showTargetPicker,
                  child: const Text('Változtat'),
                ),
              ]),

              const Divider(height: 16),

              // Eltérések
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: [
                  _DeltaCell(
                    label: 'ΔY',
                    value: controller.deltaY,
                    unit: 'm',
                  ),
                  _DeltaCell(
                    label: 'ΔX',
                    value: controller.deltaX,
                    unit: 'm',
                  ),
                  _DeltaCell(
                    label: 'Táv',
                    value: controller.distanceToTarget,
                    unit: 'm',
                    alwaysPositive: true,
                  ),
                ],
              ),

              const SizedBox(height: 8),

              // Státusz
              Container(
                width: double.infinity,
                padding: const EdgeInsets.symmetric(vertical: 6),
                decoration: BoxDecoration(
                  color: onTarget
                      ? Colors.green.withOpacity(0.12)
                      : Colors.orange.withOpacity(0.12),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Text(
                  onTarget
                      ? '✓ Célponton — pont rögzíthető'
                      : '${controller.distanceToTarget.toStringAsFixed(3)} m a céltól',
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    fontWeight: FontWeight.w500,
                    color: onTarget ? Colors.green : Colors.orange,
                    fontSize: 13,
                  ),
                ),
              ),
            ],
          );
        }),
      ),
    );
  }

  void _showTargetPicker() {
    // Lista a korábban bemért vagy tervezett pontokból
    //Get.bottomSheet(const _TargetPickerSheet());
  }
}

class _DeltaCell extends StatelessWidget {
  final String label;
  final double value;
  final String unit;
  final bool alwaysPositive;

  const _DeltaCell({
    required this.label,
    required this.value,
    required this.unit,
    this.alwaysPositive = false,
  });

  @override
  Widget build(BuildContext context) {
    final display = alwaysPositive ? value.abs() : value;
    final prefix = (!alwaysPositive && value > 0) ? '+' : '';
    final color = value.abs() < 0.05
        ? Colors.green
        : value.abs() < 0.5
            ? Colors.orange
            : Colors.red;

    return Column(
      children: [
        Text(label, style: const TextStyle(fontSize: 11, color: Colors.grey)),
        const SizedBox(height: 2),
        Text(
          '$prefix${display.toStringAsFixed(3)} $unit',
          style: TextStyle(
            fontSize: 15,
            fontWeight: FontWeight.w600,
            color: color,
          ),
        ),
      ],
    );
  }
}