import 'dart:async';

import 'package:flutter/material.dart';
import 'package:lunchpick/core/constants/app_colors.dart';
import 'package:lunchpick/core/constants/app_typography.dart';
import 'package:lunchpick/core/utils/distance_calculator.dart';
import 'package:lunchpick/domain/entities/restaurant.dart';

enum RecommendationDialogResult { confirm, reroll, autoConfirm }

class RecommendationResultDialog extends StatefulWidget {
  final Restaurant restaurant;
  final Duration autoConfirmDuration;
  final double? currentLatitude;
  final double? currentLongitude;

  const RecommendationResultDialog({
    super.key,
    required this.restaurant,
    this.autoConfirmDuration = const Duration(seconds: 12),
    this.currentLatitude,
    this.currentLongitude,
  });

  @override
  State<RecommendationResultDialog> createState() =>
      _RecommendationResultDialogState();
}

class _RecommendationResultDialogState
    extends State<RecommendationResultDialog> {
  Timer? _autoConfirmTimer;
  bool _didComplete = false;
  double? _distanceKm;

  @override
  void initState() {
    super.initState();
    _calculateDistance();
    _startAutoConfirmTimer();
  }

  @override
  void dispose() {
    _autoConfirmTimer?.cancel();
    super.dispose();
  }

  void _startAutoConfirmTimer() {
    _autoConfirmTimer = Timer(widget.autoConfirmDuration, () {
      if (!mounted || _didComplete) return;
      _didComplete = true;
      Navigator.of(context).pop(RecommendationDialogResult.autoConfirm);
    });
  }

  void _calculateDistance() {
    final lat = widget.currentLatitude;
    final lon = widget.currentLongitude;
    if (lat == null || lon == null) return;

    _distanceKm = DistanceCalculator.calculateDistance(
      lat1: lat,
      lon1: lon,
      lat2: widget.restaurant.latitude,
      lon2: widget.restaurant.longitude,
    );
  }

  String _formatDistance(double distanceKm) {
    final meters = distanceKm * 1000;
    if (meters >= 1000) {
      return '${distanceKm.toStringAsFixed(1)} km';
    }
    return '${meters.round()} m';
  }

  Future<void> _handleResult(RecommendationDialogResult result) async {
    if (_didComplete) return;
    _didComplete = true;
    _autoConfirmTimer?.cancel();
    Navigator.of(context).pop(result);
  }

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;

    return WillPopScope(
      onWillPop: () async {
        await _handleResult(RecommendationDialogResult.confirm);
        return true;
      },
      child: Dialog(
        backgroundColor: Colors.transparent,
        child: Container(
          decoration: BoxDecoration(
            color: isDark ? AppColors.darkSurface : AppColors.lightSurface,
            borderRadius: BorderRadius.circular(20),
          ),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Container(
                height: 150,
                decoration: BoxDecoration(
                  color: AppColors.lightPrimary,
                  borderRadius: const BorderRadius.vertical(
                    top: Radius.circular(20),
                  ),
                ),
                child: Stack(
                  children: [
                    Center(
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          const Icon(
                            Icons.restaurant_menu,
                            size: 64,
                            color: Colors.white,
                          ),
                          const SizedBox(height: 8),
                          Text(
                            '오늘의 추천!',
                            style: AppTypography.heading2(
                              false,
                            ).copyWith(color: Colors.white),
                          ),
                        ],
                      ),
                    ),
                    Positioned(
                      top: 8,
                      right: 8,
                      child: IconButton(
                        icon: const Icon(Icons.close, color: Colors.white),
                        onPressed: () async {
                          await _handleResult(
                            RecommendationDialogResult.confirm,
                          );
                        },
                      ),
                    ),
                  ],
                ),
              ),
              Padding(
                padding: const EdgeInsets.all(24),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Center(
                      child: Text(
                        widget.restaurant.name,
                        style: AppTypography.heading1(isDark),
                        textAlign: TextAlign.center,
                      ),
                    ),
                    const SizedBox(height: 8),
                    Center(
                      child: Container(
                        padding: const EdgeInsets.symmetric(
                          horizontal: 12,
                          vertical: 4,
                        ),
                        decoration: BoxDecoration(
                          color: AppColors.lightPrimary.withOpacity(0.1),
                          borderRadius: BorderRadius.circular(12),
                        ),
                        child: Text(
                          '${widget.restaurant.category} > ${widget.restaurant.subCategory}',
                          style: AppTypography.body2(
                            isDark,
                          ).copyWith(color: AppColors.lightPrimary),
                        ),
                      ),
                    ),
                    if (widget.restaurant.description != null) ...[
                      const SizedBox(height: 16),
                      Text(
                        widget.restaurant.description!,
                        style: AppTypography.body2(isDark),
                        textAlign: TextAlign.center,
                      ),
                    ],
                    const SizedBox(height: 16),
                    const Divider(),
                    const SizedBox(height: 16),
                    Row(
                      children: [
                        Icon(
                          Icons.location_on,
                          size: 20,
                          color: isDark
                              ? AppColors.darkTextSecondary
                              : AppColors.lightTextSecondary,
                        ),
                        const SizedBox(width: 8),
                        Expanded(
                          child: Text(
                            widget.restaurant.roadAddress,
                            style: AppTypography.body2(isDark),
                          ),
                        ),
                      ],
                    ),
                    if (_distanceKm != null) ...[
                      const SizedBox(height: 8),
                      Row(
                        children: [
                          Icon(
                            Icons.place,
                            size: 20,
                            color: AppColors.lightPrimary,
                          ),
                          const SizedBox(width: 8),
                          Text(
                            _formatDistance(_distanceKm!),
                            style: AppTypography.body2(isDark).copyWith(
                              color: AppColors.lightPrimary,
                              fontWeight: FontWeight.w600,
                            ),
                          ),
                        ],
                      ),
                    ],
                    if (widget.restaurant.phoneNumber != null) ...[
                      const SizedBox(height: 8),
                      Row(
                        children: [
                          Icon(
                            Icons.phone,
                            size: 20,
                            color: isDark
                                ? AppColors.darkTextSecondary
                                : AppColors.lightTextSecondary,
                          ),
                          const SizedBox(width: 8),
                          Text(
                            widget.restaurant.phoneNumber!,
                            style: AppTypography.body2(isDark),
                          ),
                        ],
                      ),
                    ],
                    const SizedBox(height: 24),
                    Row(
                      children: [
                        Expanded(
                          child: OutlinedButton(
                            onPressed: () async {
                              await _handleResult(
                                RecommendationDialogResult.reroll,
                              );
                            },
                            style: OutlinedButton.styleFrom(
                              padding: const EdgeInsets.symmetric(vertical: 12),
                              side: const BorderSide(
                                color: AppColors.lightPrimary,
                              ),
                              shape: RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(8),
                              ),
                            ),
                            child: const Text(
                              '다시 뽑기',
                              style: TextStyle(color: AppColors.lightPrimary),
                            ),
                          ),
                        ),
                        const SizedBox(width: 12),
                        Expanded(
                          child: ElevatedButton(
                            onPressed: () async {
                              await _handleResult(
                                RecommendationDialogResult.confirm,
                              );
                            },
                            style: ElevatedButton.styleFrom(
                              padding: const EdgeInsets.symmetric(vertical: 12),
                              backgroundColor: AppColors.lightPrimary,
                              foregroundColor: Colors.white,
                              shape: RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(8),
                              ),
                            ),
                            child: const Text('오늘의 선택!'),
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 8),
                    Text(
                      '앱을 종료하면 자동으로 선택이 확정됩니다.',
                      style: AppTypography.caption(isDark),
                      textAlign: TextAlign.center,
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}