// lib/features/reviews/widgets/review_form.dart
import 'package:flutter/material.dart';
import '../../../core/storage/token_storage.dart';
import '../../../core/utils/error_utils.dart';
import '../models/review_models.dart';
import 'star_rating_input.dart';

class ReviewForm extends StatefulWidget {
  final int eventId;
  final ReviewModel? existingReview;
  final Future<void> Function(int rating, String? comment) onSubmit;

  const ReviewForm({
    Key? key,
    required this.eventId,
    this.existingReview,
    required this.onSubmit,
  }) : super(key: key);

  @override
  State<ReviewForm> createState() => _ReviewFormState();
}

enum _FormState { idle, loading, success }

class _ReviewFormState extends State<ReviewForm> with SingleTickerProviderStateMixin {
  int _rating = 0;
  final _commentController = TextEditingController();
  _FormState _state = _FormState.idle;
  bool _isLoggedIn = false;
  String? _error;

  late final AnimationController _checkController;
  late final Animation<double> _checkScale;

  @override
  void initState() {
    super.initState();
    _checkAuth();
    if (widget.existingReview != null) {
      _rating = widget.existingReview!.rating;
      _commentController.text = widget.existingReview!.comment ?? '';
    }
    _checkController = AnimationController(vsync: this, duration: const Duration(milliseconds: 600));
    _checkScale = CurvedAnimation(parent: _checkController, curve: Curves.elasticOut);
  }

  Future<void> _checkAuth() async {
    final token = await TokenStorage.getToken();
    final username = await TokenStorage.getUsername();
    if (mounted) setState(() => _isLoggedIn = token != null && username != null);
  }

  Future<void> _handleSubmit() async {
    if (_rating == 0) {
      setState(() => _error = 'Please select a rating');
      return;
    }
    setState(() { _state = _FormState.loading; _error = null; });
    try {
      await widget.onSubmit(_rating, _commentController.text);
      if (mounted) {
        setState(() => _state = _FormState.success);
        _checkController.forward(from: 0);
        Future.delayed(const Duration(seconds: 3), () {
          if (mounted) setState(() => _state = _FormState.idle);
        });
      }
    } catch (e) {
      if (mounted) setState(() { _state = _FormState.idle; _error = userFriendlyError(e); });
    }
  }

  @override
  void dispose() {
    _commentController.dispose();
    _checkController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!_isLoggedIn) {
      return Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: const Color(0xFFF8FAFC),
          borderRadius: BorderRadius.circular(12),
          border: Border.all(color: const Color(0xFFE2E8F0)),
        ),
        child: Row(
          children: [
            const Icon(Icons.login, color: Color(0xFF64748B), size: 20),
            const SizedBox(width: 8),
            const Expanded(
              child: Text('Log in to write a review', style: TextStyle(color: Color(0xFF64748B), fontSize: 14)),
            ),
          ],
        ),
      );
    }

    return AnimatedSwitcher(
      duration: const Duration(milliseconds: 300),
      child: _state == _FormState.success
          ? Container(
              key: const ValueKey('success'),
              padding: const EdgeInsets.all(20),
              decoration: BoxDecoration(
                color: const Color(0xFFF0FDF4),
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: const Color(0xFF86EFAC)),
              ),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  ScaleTransition(
                    scale: _checkScale,
                    child: const Icon(Icons.check_circle, color: Color(0xFF10B981), size: 24),
                  ),
                  const SizedBox(width: 8),
                  const Text('Review submitted!', style: TextStyle(color: Color(0xFF10B981), fontWeight: FontWeight.w600, fontSize: 15)),
                ],
              ),
            )
          : Container(
              key: const ValueKey('form'),
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(16),
                boxShadow: [
                  BoxShadow(color: Colors.black.withValues(alpha: 0.05), blurRadius: 8, offset: const Offset(0, 2)),
                ],
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    widget.existingReview != null ? 'Update your review' : 'Write a review',
                    style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: Color(0xFF1E293B)),
                  ),
                  const SizedBox(height: 12),
                  Center(child: StarRatingInput(rating: _rating, onRatingChanged: (r) => setState(() { _rating = r; _error = null; }))),
                  const SizedBox(height: 12),
                  TextField(
                    controller: _commentController,
                    maxLength: 500,
                    maxLines: 3,
                    decoration: InputDecoration(
                      hintText: 'Share your experience (optional)',
                      hintStyle: const TextStyle(color: Color(0xFF94A3B8), fontSize: 14),
                      filled: true,
                      fillColor: const Color(0xFFF8FAFC),
                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: const BorderSide(color: Color(0xFFE2E8F0))),
                      enabledBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: const BorderSide(color: Color(0xFFE2E8F0))),
                      focusedBorder: OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: const BorderSide(color: Color(0xFF0F45CF), width: 1.5)),
                      counterStyle: const TextStyle(color: Color(0xFF94A3B8), fontSize: 11),
                    ),
                  ),
                  if (_error != null) ...[
                    const SizedBox(height: 4),
                    Text(_error!, style: const TextStyle(color: Color(0xFFEF4444), fontSize: 12)),
                  ],
                  const SizedBox(height: 12),
                  SizedBox(
                    width: double.infinity,
                    height: 46,
                    child: ElevatedButton(
                      onPressed: _state == _FormState.loading ? null : _handleSubmit,
                      style: ElevatedButton.styleFrom(
                        backgroundColor: const Color(0xFF0F45CF),
                        foregroundColor: Colors.white,
                        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
                        disabledBackgroundColor: const Color(0xFF0F45CF).withValues(alpha: 0.5),
                      ),
                      child: _state == _FormState.loading
                          ? const SizedBox(width: 22, height: 22, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
                          : Text(
                              widget.existingReview != null ? 'Update Review' : 'Submit Review',
                              style: const TextStyle(fontWeight: FontWeight.w600, fontSize: 15),
                            ),
                    ),
                  ),
                ],
              ),
            ),
    );
  }
}