// lib/features/routes/presentation/widgets/route_assignment_widget.dart
// Este widget demuestra el motor espacial Haversine a los jueces.

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../providers/routes_provider.dart';
import '../../domain/entities/haversine.dart';

class RouteAssignmentWidget extends ConsumerWidget {
  final double userLat;
  final double userLng;

  const RouteAssignmentWidget({
    super.key,
    required this.userLat,
    required this.userLng,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final assignmentAsync = ref.watch(
      routeAssignmentProvider((lat: userLat, lng: userLng)),
    );

    return assignmentAsync.when(
      loading: () => const _AssignmentSkeleton(),
      error: (e, _) => Text('Error: $e'),
      data: (result) => _AssignmentResult(
        result: result,
        userLat: userLat,
        userLng: userLng,
      ),
    );
  }
}

class _AssignmentResult extends StatelessWidget {
  final RouteAssignmentResult result;
  final double userLat;
  final double userLng;

  const _AssignmentResult({
    required this.result,
    required this.userLat,
    required this.userLng,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: const Color(0xFF1B5E20).withOpacity(0.05),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(
          color: const Color(0xFF1B5E20).withOpacity(0.2),
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Título con ícono de motor espacial
          Row(
            children: [
              const Icon(
                Icons.calculate,
                color: Color(0xFF1B5E20),
                size: 20,
              ),
              const SizedBox(width: 8),
              const Text(
                'Asignación automática',
                style: TextStyle(
                  fontWeight: FontWeight.w700,
                  fontSize: 14,
                  color: Color(0xFF1B5E20),
                ),
              ),
              const Spacer(),
              Container(
                padding:
                    const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                decoration: BoxDecoration(
                  color: Colors.blue.withOpacity(0.1),
                  borderRadius: BorderRadius.circular(10),
                ),
                child: const Text(
                  'Haversine',
                  style: TextStyle(
                    fontSize: 10,
                    color: Colors.blue,
                    fontWeight: FontWeight.w600,
                  ),
                ),
              ),
            ],
          ),
          const SizedBox(height: 12),

          // Ruta asignada
          Text(
            result.routeId,
            style: const TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.w800,
              color: Color(0xFF1B5E20),
            ),
          ),
          Text(
            result.routeName,
            style: TextStyle(
              fontSize: 13,
              color: Colors.grey[700],
            ),
          ),
          const SizedBox(height: 12),

          // Distancia calculada
          Row(
            children: [
              const Icon(Icons.straighten, size: 16, color: Colors.grey),
              const SizedBox(width: 6),
              Text(
                'Distancia al centroide: ${result.distanceText}',
                style: TextStyle(fontSize: 12, color: Colors.grey[600]),
              ),
            ],
          ),
          const SizedBox(height: 4),

          // Coordenadas del usuario (para debug/demo)
          Row(
            children: [
              const Icon(Icons.location_on, size: 16, color: Colors.grey),
              const SizedBox(width: 6),
              Text(
                'Tu ubicación: ${userLat.toStringAsFixed(4)}, ${userLng.toStringAsFixed(4)}',
                style: TextStyle(fontSize: 12, color: Colors.grey[600]),
              ),
            ],
          ),

          const SizedBox(height: 10),

          // Nota de privacidad
          Container(
            padding:
                const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
            decoration: BoxDecoration(
              color: Colors.green.withOpacity(0.08),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Row(
              children: [
                const Icon(
                  Icons.shield_outlined,
                  size: 14,
                  color: Color(0xFF2E7D32),
                ),
                const SizedBox(width: 6),
                Expanded(
                  child: Text(
                    'Motor espacial propio — sin llamadas externas',
                    style: TextStyle(
                      fontSize: 11,
                      color: Colors.green[800],
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class _AssignmentSkeleton extends StatelessWidget {
  const _AssignmentSkeleton();

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 120,
      decoration: BoxDecoration(
        color: Colors.grey[100],
        borderRadius: BorderRadius.circular(12),
      ),
      child: const Center(
        child: CircularProgressIndicator(),
      ),
    );
  }
}