import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../models/history_entry_model.dart';
import '../services/ai_oracle_service.dart';
import '../services/words_repository.dart';
import '../widgets/gradient_star_badge.dart';

class SessionResultScreen extends StatefulWidget {
  final OracleSession session;

  const SessionResultScreen({
    super.key,
    required this.session,
  });

  @override
  State<SessionResultScreen> createState() => _SessionResultScreenState();
}

class _SessionResultScreenState extends State<SessionResultScreen> {
  final _aiService = AiOracleService();
  final _repo = WordsRepository();

  late OracleSession _session;
  bool _isLoadingAi = false;

  @override
  void initState() {
    super.initState();
    _session = widget.session;
    // Persist the session atomically
    _repo.saveSession(_session);
  }

  Future<void> _fetchAiInterpretation() async {
    setState(() => _isLoadingAi = true);
    HapticFeedback.mediumImpact();

    try {
      final result = await _aiService.interpretSession(
        words: _session.words,
        question: _session.question ?? '',
      );

      if (mounted) {
        final updated = _session.copyWith(aiInterpretation: result);
        setState(() {
          _session = updated;
          _isLoadingAi = false;
        });
        await _repo.saveSession(updated);
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isLoadingAi = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            content: Text('Ошибка генерации: $e'),
            behavior: SnackBarBehavior.floating,
          ),
        );
      }
    }
  }

  void _copySessionToClipboard() {
    final buf = StringBuffer();
    buf.writeln('✨ Оракул 999 — Сессия Клеромантии ✨');
    buf.writeln('Дата: ${_session.formattedDate}');
    if (_session.question != null && _session.question!.isNotEmpty) {
      buf.writeln('Вопрос: «${_session.question}»');
    }
    buf.writeln('Знаков в цепочке: ${_session.words.length}\n');

    for (int i = 0; i < _session.words.length; i++) {
      final w = _session.words[i];
      final pos = w.positionTitle != null ? ' (${w.positionTitle})' : '';
      buf.writeln('🔮 Знак #${w.formattedSessionNumber}: ${w.word.toUpperCase()}$pos');
      buf.writeln('   Аспект: ${w.partOfSpeech} • ${w.category}');
      buf.writeln('   Смысл: ${w.symbolicMeaning}\n');
    }

    if (_session.aiInterpretation != null) {
      buf.writeln('🤖 AI Трактовка Оракула (G4F):');
      buf.writeln(_session.aiInterpretation);
    }

    Clipboard.setData(ClipboardData(text: buf.toString()));
    HapticFeedback.lightImpact();
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: const Row(
          children: [
            GradientStar(size: 18),
            SizedBox(width: 10),
            Expanded(child: Text('Вся сессия скопирована в буфер обмена')),
          ],
        ),
        duration: const Duration(seconds: 2),
        behavior: SnackBarBehavior.floating,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      ),
    );
  }

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

    return Scaffold(
      appBar: AppBar(
        title: Row(
          children: [
            const GradientStar(size: 22),
            const SizedBox(width: 8),
            Text(
              'Знаки Сессии (${_session.words.length})',
              style: const TextStyle(fontWeight: FontWeight.w900),
            ),
          ],
        ),
        actions: [
          IconButton(
            tooltip: 'Скопировать сессию',
            icon: const Icon(Icons.copy_rounded),
            onPressed: _copySessionToClipboard,
          ),
        ],
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              // Question Banner
              if (_session.question != null && _session.question!.isNotEmpty) ...[
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: const Color(0xFF1E2138),
                    borderRadius: BorderRadius.circular(16),
                    border: Border.all(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.3),
                    ),
                  ),
                  child: Row(
                    children: [
                      const Icon(Icons.help_outline_rounded, size: 18, color: Color(0xFFFFD54F)),
                      const SizedBox(width: 10),
                      Expanded(
                        child: Text(
                          'Вопрос: «${_session.question}»',
                          style: const TextStyle(
                            fontSize: 13,
                            fontWeight: FontWeight.w600,
                            color: Color(0xFFFFF9C4),
                            fontStyle: FontStyle.italic,
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 14),
              ],

              // AI Interpretation Box if generated or button
              if (_session.aiInterpretation != null) ...[
                Container(
                  padding: const EdgeInsets.all(16),
                  decoration: BoxDecoration(
                    gradient: const LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [Color(0xFF2A1E4A), Color(0xFF191833)],
                    ),
                    borderRadius: BorderRadius.circular(20),
                    border: Border.all(
                      color: const Color(0xFFBA68C8).withValues(alpha: 0.6),
                      width: 1.2,
                    ),
                  ),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          const Row(
                            children: [
                              Icon(Icons.psychology_rounded, size: 20, color: Color(0xFFE1BEE7)),
                              SizedBox(width: 8),
                              Text(
                                'AI ТРАКТОВКА ИСТОРИИ (G4F)',
                                style: TextStyle(
                                  fontSize: 12,
                                  fontWeight: FontWeight.w900,
                                  letterSpacing: 0.8,
                                  color: Color(0xFFE1BEE7),
                                ),
                              ),
                            ],
                          ),
                          IconButton(
                            icon: const Icon(Icons.refresh_rounded, size: 18, color: Color(0xFFE1BEE7)),
                            tooltip: 'Перегенерировать',
                            onPressed: _fetchAiInterpretation,
                          ),
                        ],
                      ),
                      const SizedBox(height: 10),
                      Text(
                        _session.aiInterpretation!,
                        style: const TextStyle(
                          fontSize: 13.5,
                          height: 1.5,
                          color: Color(0xFFF3E5F5),
                        ),
                      ),
                    ],
                  ),
                ),
                const SizedBox(height: 16),
              ] else ...[
                FilledButton.icon(
                  onPressed: _isLoadingAi ? null : _fetchAiInterpretation,
                  icon: _isLoadingAi
                      ? const SizedBox(
                          width: 18,
                          height: 18,
                          child: CircularProgressIndicator(
                            strokeWidth: 2,
                            valueColor: AlwaysStoppedAnimation<Color>(Color(0xFFFFD54F)),
                          ),
                        )
                      : const Icon(Icons.auto_awesome, size: 18, color: Color(0xFFE1BEE7)),
                  label: Text(
                    _isLoadingAi ? 'Синтез толкования...' : 'Синтезировать связную AI-трактовку (G4F)',
                    style: const TextStyle(
                      fontWeight: FontWeight.bold,
                      fontSize: 13,
                      color: Color(0xFFFFF9C4),
                    ),
                  ),
                  style: FilledButton.styleFrom(
                    backgroundColor: const Color(0xFF2A2145),
                    padding: const EdgeInsets.symmetric(vertical: 14),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(16),
                      side: const BorderSide(
                        color: Color(0xFFBA68C8),
                        width: 1.2,
                      ),
                    ),
                  ),
                ),
                const SizedBox(height: 16),
              ],

              // Word Cards List
              ..._session.words.asMap().entries.map((entry) {
                final idx = entry.key;
                final w = entry.value;

                return Padding(
                  padding: const EdgeInsets.only(bottom: 14),
                  child: Card(
                    elevation: 6,
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(20),
                      side: BorderSide(
                        color: const Color(0xFFFFD54F).withValues(alpha: 0.25),
                      ),
                    ),
                    color: isDark ? const Color(0xFF1B1D30) : theme.colorScheme.surface,
                    child: Padding(
                      padding: const EdgeInsets.all(16),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: [
                              Row(
                                children: [
                                  const GradientStar(size: 15),
                                  const SizedBox(width: 6),
                                  Text(
                                    '${idx + 1}. ЗНАК #${w.formattedSessionNumber}',
                                    style: const TextStyle(
                                      fontWeight: FontWeight.w900,
                                      fontSize: 13,
                                      color: Color(0xFFFFD54F),
                                      letterSpacing: 0.5,
                                    ),
                                  ),
                                ],
                              ),
                              Container(
                                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                                decoration: BoxDecoration(
                                  color: isDark ? const Color(0xFF262A48) : Colors.black12,
                                  borderRadius: BorderRadius.circular(8),
                                ),
                                child: Text(
                                  w.partOfSpeech,
                                  style: TextStyle(
                                    fontSize: 11,
                                    color: isDark ? const Color(0xFFB0B7DE) : Colors.black87,
                                    fontWeight: FontWeight.w600,
                                  ),
                                ),
                              ),
                            ],
                          ),
                          const SizedBox(height: 10),
                          Center(
                            child: Text(
                              w.word.toUpperCase(),
                              style: const TextStyle(
                                fontSize: 24,
                                fontWeight: FontWeight.w900,
                                letterSpacing: 1.5,
                                color: Color(0xFFFFF9C4),
                              ),
                            ),
                          ),
                          const SizedBox(height: 10),
                          Container(
                            width: double.infinity,
                            padding: const EdgeInsets.all(12),
                            decoration: BoxDecoration(
                              color: isDark ? const Color(0xFF131525) : theme.colorScheme.surfaceContainerLow,
                              borderRadius: BorderRadius.circular(14),
                            ),
                            child: Text(
                              w.symbolicMeaning,
                              style: TextStyle(
                                fontSize: 13,
                                height: 1.45,
                                color: isDark ? const Color(0xFFD4D6E6) : Colors.black87,
                              ),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                );
              }),
            ],
          ),
        ),
      ),
    );
  }
}