/// Page dédiée à l'envoi de commentaires / feedback
library feedback_page;

import 'package:flutter/material.dart';
import '../../../../core/di/injection.dart';
import '../../../../core/network/api_client.dart';
import '../../../../core/utils/logger.dart';
import '../../../../shared/design_system/components/uf_app_bar.dart';
import '../../../../shared/design_system/unionflow_design_system.dart';
import '../../../../shared/widgets/core_card.dart';

// ─────────────────────────────────────────────────────────────────────────────
// Données statiques
// ─────────────────────────────────────────────────────────────────────────────

const _kCategories = [
  _FeedbackCategory('suggestion',   'Suggestion',     Icons.lightbulb_outline,  AppColors.primary),
  _FeedbackCategory('bug',          'Bug / Problème', Icons.bug_report_outlined, AppColors.error),
  _FeedbackCategory('amelioration', 'Amélioration',   Icons.trending_up,         AppColors.success),
  _FeedbackCategory('autre',        'Autre',          Icons.help_outline,        AppColors.primaryDark),
];

const _kMaxLength = 1000;

// ─────────────────────────────────────────────────────────────────────────────
// Page
// ─────────────────────────────────────────────────────────────────────────────

class FeedbackPage extends StatefulWidget {
  const FeedbackPage({super.key});

  @override
  State<FeedbackPage> createState() => _FeedbackPageState();
}

class _FeedbackPageState extends State<FeedbackPage> {
  final _messageController = TextEditingController();
  String _selectedCategory = 'suggestion';
  bool _isSending = false;
  int _charCount = 0;

  @override
  void initState() {
    super.initState();
    _messageController.addListener(
      () => setState(() => _charCount = _messageController.text.length),
    );
  }

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

  Future<void> _submitFeedback() async {
    final message = _messageController.text.trim();
    if (message.isEmpty) {
      _showSnackBar('Veuillez saisir un message.', isError: true);
      return;
    }
    setState(() => _isSending = true);
    try {
      final cat = _kCategories.firstWhere((c) => c.id == _selectedCategory);
      await getIt<ApiClient>().post(
        '/api/feedback',
        data: {
          'subject': '[${cat.label}] Feedback mobile',
          'message': message,
        },
      );
      if (mounted) {
        _messageController.clear();
        _showSnackBar('Merci pour votre retour !');
      }
    } catch (e, st) {
      AppLogger.error('FeedbackPage: envoi feedback échoué', error: e, stackTrace: st);
      if (mounted) _showSnackBar('Envoi échoué. Réessayez plus tard.', isError: true);
    } finally {
      if (mounted) setState(() => _isSending = false);
    }
  }

  void _showSnackBar(String message, {bool isError = false}) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        backgroundColor: isError ? AppColors.error : AppColors.success,
        behavior: SnackBarBehavior.floating,
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).scaffoldBackgroundColor,
      appBar: UFAppBar(
        title: 'Commentaires',
        moduleGradient: ModuleColors.supportGradient,
      ),
      body: SafeArea(
        top: false,
        child: ListView(
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
          children: [
            const SizedBox(height: 4),
            _buildCategorySection(),
            const SizedBox(height: 8),
            _buildMessageSection(),
            const SizedBox(height: 12),
            _buildSubmitButton(),
            const SizedBox(height: 80),
          ],
        ),
      ),
    );
  }

  // ── Section catégories ────────────────────────────────────────────────────

  Widget _buildCategorySection() {
    final scheme = Theme.of(context).colorScheme;
    return CoreCard(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.category_outlined, color: scheme.onSurfaceVariant, size: 16),
              const SizedBox(width: 8),
              Text(
                'TYPE DE RETOUR',
                style: AppTypography.subtitleSmall.copyWith(
                  fontWeight: FontWeight.bold,
                  letterSpacing: 1.1,
                  color: scheme.onSurfaceVariant,
                ),
              ),
            ],
          ),
          const SizedBox(height: 12),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: _kCategories.map(_buildCategoryChip).toList(),
          ),
        ],
      ),
    );
  }

  Widget _buildCategoryChip(_FeedbackCategory cat) {
    final scheme = Theme.of(context).colorScheme;
    final isSelected = _selectedCategory == cat.id;
    return InkWell(
      onTap: () => setState(() => _selectedCategory = cat.id),
      borderRadius: BorderRadius.circular(8),
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 180),
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
        decoration: BoxDecoration(
          color: isSelected ? cat.color.withOpacity(0.1) : scheme.surface,
          borderRadius: BorderRadius.circular(8),
          border: Border.all(
            color: isSelected ? cat.color.withOpacity(0.5) : scheme.outlineVariant,
            width: isSelected ? 1.5 : 1,
          ),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              cat.icon,
              size: 15,
              color: isSelected ? cat.color : scheme.onSurfaceVariant,
            ),
            const SizedBox(width: 6),
            Text(
              cat.label,
              style: AppTypography.actionText.copyWith(
                fontSize: 12,
                fontWeight: FontWeight.w600,
                color: isSelected ? cat.color : scheme.onSurfaceVariant,
              ),
            ),
          ],
        ),
      ),
    );
  }

  // ── Section message ────────────────────────────────────────────────────────

  Widget _buildMessageSection() {
    final scheme = Theme.of(context).colorScheme;
    final isNearLimit = _charCount > _kMaxLength * 0.85;
    return CoreCard(
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.edit_note_outlined, color: scheme.onSurfaceVariant, size: 16),
              const SizedBox(width: 8),
              Text(
                'VOTRE MESSAGE',
                style: AppTypography.subtitleSmall.copyWith(
                  fontWeight: FontWeight.bold,
                  letterSpacing: 1.1,
                  color: scheme.onSurfaceVariant,
                ),
              ),
              const Spacer(),
              Text(
                '$_charCount / $_kMaxLength',
                style: AppTypography.subtitleSmall.copyWith(
                  fontSize: 10,
                  color: isNearLimit ? AppColors.error : scheme.onSurfaceVariant,
                  fontWeight: isNearLimit ? FontWeight.bold : FontWeight.normal,
                ),
              ),
            ],
          ),
          const SizedBox(height: 12),
          TextField(
            controller: _messageController,
            maxLines: 7,
            maxLength: _kMaxLength,
            buildCounter: (_, {required currentLength, required isFocused, maxLength}) =>
                const SizedBox.shrink(),
            style: AppTypography.bodyTextSmall.copyWith(
              color: scheme.onSurface,
              fontSize: 13,
            ),
            decoration: InputDecoration(
              hintText: 'Décrivez votre suggestion, problème ou idée...',
              hintStyle: AppTypography.subtitleSmall.copyWith(
                color: scheme.onSurfaceVariant,
              ),
              filled: true,
              fillColor: scheme.surfaceContainerHighest.withOpacity(0.4),
              border: OutlineInputBorder(
                borderRadius: BorderRadius.circular(8),
                borderSide: BorderSide(color: scheme.outlineVariant),
              ),
              enabledBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(8),
                borderSide: BorderSide(color: scheme.outlineVariant),
              ),
              focusedBorder: OutlineInputBorder(
                borderRadius: BorderRadius.circular(8),
                borderSide: BorderSide(color: ModuleColors.support, width: 1.5),
              ),
              contentPadding: const EdgeInsets.all(12),
            ),
          ),
        ],
      ),
    );
  }

  // ── Bouton envoi ──────────────────────────────────────────────────────────

  Widget _buildSubmitButton() {
    return SizedBox(
      width: double.infinity,
      child: ElevatedButton.icon(
        onPressed: _isSending ? null : _submitFeedback,
        icon: _isSending
            ? const SizedBox(
                width: 16,
                height: 16,
                child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
              )
            : const Icon(Icons.send_rounded, color: Colors.white, size: 16),
        label: Text(
          _isSending ? 'Envoi en cours...' : 'Envoyer le commentaire',
          style: AppTypography.actionText.copyWith(
            fontWeight: FontWeight.w600,
            color: Colors.white,
          ),
        ),
        style: ElevatedButton.styleFrom(
          backgroundColor: ModuleColors.support,
          disabledBackgroundColor: ModuleColors.support.withOpacity(0.5),
          padding: const EdgeInsets.symmetric(vertical: 10),
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
          elevation: 0,
        ),
      ),
    );
  }
}

// ─────────────────────────────────────────────────────────────────────────────
// Modèle de catégorie
// ─────────────────────────────────────────────────────────────────────────────

class _FeedbackCategory {
  final String id;
  final String label;
  final IconData icon;
  final Color color;

  const _FeedbackCategory(this.id, this.label, this.icon, this.color);
}