import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../models/divination_layout.dart';
import '../models/syncretic_session_model.dart';
import '../models/tradition_model.dart';
import '../models/word_model.dart';
import '../services/traditions_repository.dart';
import '../services/words_repository.dart';
import '../widgets/divination_instruction_modal.dart';

class RunesDivinationScreen extends StatefulWidget {
  final String? initialQuestion;

  const RunesDivinationScreen({super.key, this.initialQuestion});

  @override
  State<RunesDivinationScreen> createState() => _RunesDivinationScreenState();
}

class _RunesDivinationScreenState extends State<RunesDivinationScreen> with SingleTickerProviderStateMixin {
  late TabController _tabController;
  final _questionController = TextEditingController();
  final _repo = WordsRepository();

  // 24 runes from canon
  List<TraditionStation> _runes = [];

  // Layout selection
  DivinationLayout _selectedLayout = DivinationLayouts.runesLayouts[0]; // 1, 3, or 5
  int _currentStepIndex = 0; // for multi-step layouts

  // Dice state (for current step)
  int? _d12First;
  int? _d12Second;
  bool _isRollingDice = false;

  // Manual input state
  bool _isManualReversed = false;

  // Multi-item results
  List<({TraditionStation rune, bool isReversed, String positionTitle})> _drawnResults = [];
  bool _savedToSession = false;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 2, vsync: this);
    if (widget.initialQuestion != null) {
      _questionController.text = widget.initialQuestion!;
    }
    _loadRunes();
  }

  void _loadRunes() {
    final canon = TraditionsRepository().byId('runes');
    if (canon != null) {
      _runes = canon.stations.take(24).toList();
    }
  }

  @override
  void dispose() {
    _tabController.dispose();
    _questionController.dispose();
    super.dispose();
  }

  int _calculateRuneIndexFromDice(int d1, int d2) {
    final isOdd = (d1 % 2) != 0;
    final runeNumber = isOdd ? d2 : (d2 + 12);
    return (runeNumber - 1).clamp(0, 23);
  }

  void _onLayoutChanged(DivinationLayout layout) {
    setState(() {
      _selectedLayout = layout;
      _currentStepIndex = 0;
      _drawnResults.clear();
      _d12First = null;
      _d12Second = null;
      _savedToSession = false;
    });
  }

  Future<void> _rollDiceForCurrentStep() async {
    if (_runes.isEmpty || _currentStepIndex >= _selectedLayout.count) return;
    setState(() => _isRollingDice = true);
    HapticFeedback.mediumImpact();

    final rnd = Random();
    for (int i = 0; i < 8; i++) {
      await Future.delayed(const Duration(milliseconds: 50));
      if (mounted) {
        setState(() {
          _d12First = rnd.nextInt(12) + 1;
          _d12Second = rnd.nextInt(12) + 1;
        });
      }
    }

    final finalD1 = rnd.nextInt(12) + 1;
    final finalD2 = rnd.nextInt(12) + 1;
    final isRev = rnd.nextBool() && rnd.nextBool(); // 25%

    final idx = _calculateRuneIndexFromDice(finalD1, finalD2);
    final rune = _runes[idx];

    final posTitle = _selectedLayout.positionTitles[_currentStepIndex];

    if (mounted) {
      setState(() {
        _d12First = finalD1;
        _d12Second = finalD2;
        _isRollingDice = false;
        _drawnResults.add((rune: rune, isReversed: isRev, positionTitle: posTitle));
        _currentStepIndex++;
        if (_currentStepIndex >= _selectedLayout.count) {
          _saveToSession('dice');
        }
      });
      HapticFeedback.heavyImpact();
    }
  }

  void _applyManualChoice(int runeIndex) {
    if (runeIndex < 0 || runeIndex >= _runes.length || _currentStepIndex >= _selectedLayout.count) return;
    final rune = _runes[runeIndex];
    final posTitle = _selectedLayout.positionTitles[_currentStepIndex];

    setState(() {
      _drawnResults.add((rune: rune, isReversed: _isManualReversed, positionTitle: posTitle));
      _isManualReversed = false;
      _currentStepIndex++;
      if (_currentStepIndex >= _selectedLayout.count) {
        _saveToSession('manual');
      }
    });
    HapticFeedback.selectionClick();
  }

  void _resetSpread() {
    setState(() {
      _currentStepIndex = 0;
      _drawnResults.clear();
      _d12First = null;
      _d12Second = null;
      _savedToSession = false;
    });
  }

  Future<void> _saveToSession(String inputMethod) async {
    if (_drawnResults.isEmpty) return;

    final items = _drawnResults.map((r) {
      WordItem? linkedWord;
      if (r.rune.primary != null) {
        linkedWord = _repo.getWordById(r.rune.primary!.id) ?? _repo.getWordByName(r.rune.primary!.word);
      }
      return ReadingSignItem(
        title: '${r.positionTitle}: ${r.rune.name}',
        subtitle: r.rune.group,
        symbol: r.rune.symbol,
        lore: r.rune.lore,
        isReversed: r.isReversed,
        linkedWord: linkedWord,
      );
    }).toList();

    final reading = SyncreticReading(
      id: 'reading_${DateTime.now().millisecondsSinceEpoch}',
      systemId: 'runes',
      systemName: 'Руны Старшего Футарка (24)',
      systemIcon: 'ᚱ',
      timestamp: DateTime.now(),
      layoutTitle: '${_selectedLayout.title} (${inputMethod == "dice" ? "2×d12" : "со стола"})',
      inputMethod: inputMethod,
      items: items,
      question: _questionController.text.trim(),
    );

    await _repo.addReadingToSyncreticSession(reading, question: _questionController.text.trim());
    if (mounted) {
      setState(() => _savedToSession = true);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('Расклад «${_selectedLayout.title}» сохранён в сессию дня!'),
          backgroundColor: const Color(0xFF2E7D32),
          behavior: SnackBarBehavior.floating,
          duration: const Duration(seconds: 2),
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    final isSpreadComplete = _currentStepIndex >= _selectedLayout.count;

    return Scaffold(
      backgroundColor: const Color(0xFF0C0E1A),
      appBar: AppBar(
        actions: [
          IconButton(
            tooltip: 'Инструкция по рунам',
            icon: const Icon(Icons.help_outline_rounded, color: Color(0xFFFFD54F)),
            onPressed: () => DivinationInstructionModal.show(context, 'runes'),
          ),
          if (_drawnResults.isNotEmpty)
            IconButton(
              tooltip: 'Сбросить расклад',
              icon: const Icon(Icons.refresh_rounded),
              onPressed: _resetSpread,
            ),
        ],
        title: const Row(
          children: [
            Text('ᚱ', style: TextStyle(fontSize: 22, color: Color(0xFFFFD54F))),
            SizedBox(width: 8),
            Text('Руны Старшего Футарка', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 17)),
          ],
        ),
        bottom: TabBar(
          controller: _tabController,
          indicatorColor: const Color(0xFFFFD54F),
          tabs: const [
            Tab(icon: Icon(Icons.casino_rounded, size: 18), text: 'Жребий 2×d12'),
            Tab(icon: Icon(Icons.touch_app_rounded, size: 18), text: 'Ввод со стола'),
          ],
        ),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Question Input
            TextField(
              controller: _questionController,
              style: const TextStyle(color: Colors.white, fontSize: 14),
              decoration: InputDecoration(
                hintText: 'Вопрос к рунам (необязательно)...',
                hintStyle: const TextStyle(color: Color(0xFF8C93B8), fontSize: 13),
                prefixIcon: const Icon(Icons.help_outline_rounded, color: Color(0xFFFFD54F), size: 18),
                filled: true,
                fillColor: const Color(0xFF151829),
                border: OutlineInputBorder(borderRadius: BorderRadius.circular(14)),
                enabledBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(14),
                  borderSide: const BorderSide(color: Color(0xFF2A2D4A)),
                ),
              ),
            ),
            const SizedBox(height: 14),

            // Layout Picker Row
            Row(
              children: [
                const Icon(Icons.dashboard_customize_rounded, size: 16, color: Color(0xFFFFD54F)),
                const SizedBox(width: 6),
                const Text('РАСКЛАД:', style: TextStyle(color: Color(0xFFFFD54F), fontSize: 11, fontWeight: FontWeight.bold)),
                const SizedBox(width: 8),
                Expanded(
                  child: SingleChildScrollView(
                    scrollDirection: Axis.horizontal,
                    child: Row(
                      children: DivinationLayouts.runesLayouts.map((l) {
                        final isSel = _selectedLayout.id == l.id;
                        return Padding(
                          padding: const EdgeInsets.only(right: 6),
                          child: ChoiceChip(
                            label: Text(l.title, style: TextStyle(fontSize: 11.5, fontWeight: isSel ? FontWeight.bold : FontWeight.normal)),
                            selected: isSel,
                            selectedColor: const Color(0xFF4A3E1E),
                            side: BorderSide(color: isSel ? const Color(0xFFFFD54F) : const Color(0xFF2A2D4A)),
                            onSelected: (_) => _onLayoutChanged(l),
                          ),
                        );
                      }).toList(),
                    ),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 14),

            // Progress Banner
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
              decoration: BoxDecoration(
                color: const Color(0xFF181C30),
                borderRadius: BorderRadius.circular(12),
                border: Border.all(color: const Color(0xFF2A2D4A)),
              ),
              child: Row(
                children: [
                  Text(
                    'Позиция: ${_currentStepIndex + 1} из ${_selectedLayout.count}',
                    style: const TextStyle(color: Color(0xFF80DEEA), fontSize: 12, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(width: 8),
                  if (!isSpreadComplete)
                    Expanded(
                      child: Text(
                        '«${_selectedLayout.positionTitles[_currentStepIndex]}»',
                        style: const TextStyle(color: Color(0xFFFFF9C4), fontSize: 12, fontWeight: FontWeight.bold),
                        overflow: TextOverflow.ellipsis,
                      ),
                    )
                  else
                    const Text('✓ Расклад собран', style: TextStyle(color: Color(0xFF81C784), fontSize: 12, fontWeight: FontWeight.bold)),
                ],
              ),
            ),
            const SizedBox(height: 14),

            // Controls Tabs
            if (!isSpreadComplete)
              SizedBox(
                height: 310,
                child: TabBarView(
                  controller: _tabController,
                  children: [
                    _buildDiceTab(),
                    _buildManualTabThreeAetts(),
                  ],
                ),
              ),

            if (isSpreadComplete) ...[
              Container(
                padding: const EdgeInsets.all(14),
                decoration: BoxDecoration(
                  color: const Color(0xFF1E2238),
                  borderRadius: BorderRadius.circular(14),
                  border: Border.all(color: const Color(0xFF81C784)),
                ),
                child: Row(
                  children: [
                    const Icon(Icons.check_circle_rounded, color: Color(0xFF81C784), size: 20),
                    const SizedBox(width: 10),
                    const Expanded(
                      child: Text(
                        'Все руны расклада извлечены и записаны в сессию дня!',
                        style: TextStyle(color: Color(0xFFECEFF1), fontSize: 12.5, fontWeight: FontWeight.bold),
                      ),
                    ),
                    TextButton(
                      onPressed: _resetSpread,
                      child: const Text('Заново', style: TextStyle(color: Color(0xFFFFD54F), fontWeight: FontWeight.bold)),
                    ),
                  ],
                ),
              ),
            ],
            const SizedBox(height: 16),

            // Drawn Runes Cards List
            if (_drawnResults.isNotEmpty) ...[
              const Text(
                'ВЫПАВШИЕ РУНЫ В РАСКЛАДЕ:',
                style: TextStyle(color: Color(0xFFFFD54F), fontSize: 11.5, fontWeight: FontWeight.w900, letterSpacing: 0.8),
              ),
              const SizedBox(height: 10),
              for (int i = 0; i < _drawnResults.length; i++) ...[
                _buildResultRuneCard(_drawnResults[i], i + 1),
                const SizedBox(height: 10),
              ],
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildDiceTab() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: const Color(0xFF151829),
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: const Color(0xFF2A2D4A)),
      ),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          const Text(
            'БРОСОК 2×d12 (1..24 РАВНОМЕРНО)',
            style: TextStyle(color: Color(0xFFFFD54F), fontSize: 11, fontWeight: FontWeight.w900, letterSpacing: 0.8),
          ),
          const SizedBox(height: 6),
          Text(
            'Извлечение позиции: «' + _selectedLayout.positionTitles[_currentStepIndex] + '»',
            textAlign: TextAlign.center,
            style: const TextStyle(color: Color(0xFF8C93B8), fontSize: 11.5),
          ),
          const SizedBox(height: 16),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              _buildDieBox('d12 #1 (чет/нечет)', _d12First, isOddEven: true),
              const SizedBox(width: 20),
              _buildDieBox('d12 #2 (1..12)', _d12Second),
            ],
          ),
          const SizedBox(height: 18),
          ElevatedButton.icon(
            style: ElevatedButton.styleFrom(
              backgroundColor: const Color(0xFFFFD54F),
              foregroundColor: Colors.black,
              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 12),
              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
            ),
            onPressed: _isRollingDice ? null : _rollDiceForCurrentStep,
            icon: const Icon(Icons.casino_rounded, size: 20),
            label: Text(
              _isRollingDice ? 'Кости звенят...' : 'Бросить для шага ${_currentStepIndex + 1}',
              style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 13.5),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildDieBox(String label, int? val, {bool isOddEven = false}) {
    String sub = '';
    if (val != null && isOddEven) {
      sub = (val % 2 != 0) ? 'Нечет (1..12)' : 'Чет (13..24)';
    }

    return Column(
      children: [
        Container(
          width: 68,
          height: 68,
          alignment: Alignment.center,
          decoration: BoxDecoration(
            color: const Color(0xFF232742),
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: const Color(0xFFFFD54F).withValues(alpha: 0.6), width: 1.5),
          ),
          child: Text(
            val != null ? '$val' : '?',
            style: const TextStyle(color: Color(0xFFFFF9C4), fontSize: 26, fontWeight: FontWeight.w900),
          ),
        ),
        const SizedBox(height: 6),
        Text(label, style: const TextStyle(color: Color(0xFF90A4AE), fontSize: 10, fontWeight: FontWeight.bold)),
        if (sub.isNotEmpty)
          Text(sub, style: const TextStyle(color: Color(0xFFFFD54F), fontSize: 9, fontWeight: FontWeight.bold)),
      ],
    );
  }

  /// Exact 3 Rows of 8 Runes: 1st Aett (1..8), 2nd Aett (9..16), 3rd Aett (17..24)
  Widget _buildManualTabThreeAetts() {
    const aettNames = [
      'I ЭТТ ФРЕЙИ (ᚠ..ᚹ)',
      'II ЭТТ ХЕЙМДАЛЛЯ (ᚺ..ᛏ)',
      'III ЭТТ ТЮРА (ᛒ..ᛟ)',
    ];

    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: const Color(0xFF151829),
        borderRadius: BorderRadius.circular(20),
        border: Border.all(color: const Color(0xFF2A2D4A)),
      ),
      child: Column(
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                'ВЫБЕРИТЕ РУНУ ДЛЯ ШАГА ${_currentStepIndex + 1}:',
                style: const TextStyle(color: Color(0xFFFFD54F), fontSize: 10.5, fontWeight: FontWeight.bold),
              ),
              FilterChip(
                label: const Text('Перевёрнутая ᛉ/ᛦ', style: TextStyle(fontSize: 10)),
                selected: _isManualReversed,
                selectedColor: const Color(0xFFEF5350).withValues(alpha: 0.3),
                side: BorderSide(color: _isManualReversed ? const Color(0xFFEF5350) : const Color(0xFF2A2D4A)),
                onSelected: (v) => setState(() => _isManualReversed = v),
              ),
            ],
          ),
          const SizedBox(height: 6),
          // 3 Rows of 8 runes
          for (int aett = 0; aett < 3; aett++) ...[
            Padding(
              padding: const EdgeInsets.only(top: 4, bottom: 2),
              child: Align(
                alignment: Alignment.centerLeft,
                child: Text(
                  aettNames[aett],
                  style: const TextStyle(color: Color(0xFF80DEEA), fontSize: 9.5, fontWeight: FontWeight.bold),
                ),
              ),
            ),
            Row(
              children: [
                for (int col = 0; col < 8; col++) ...[
                  Builder(builder: (ctx) {
                    final idx = aett * 8 + col;
                    if (idx >= _runes.length) return const SizedBox.shrink();
                    final r = _runes[idx];
                    return Expanded(
                      child: Padding(
                        padding: const EdgeInsets.symmetric(horizontal: 2),
                        child: InkWell(
                          onTap: () => _applyManualChoice(idx),
                          borderRadius: BorderRadius.circular(6),
                          child: Container(
                            height: 38,
                            alignment: Alignment.center,
                            decoration: BoxDecoration(
                              color: const Color(0xFF1E2238),
                              borderRadius: BorderRadius.circular(6),
                              border: Border.all(color: const Color(0xFF2A2D4A)),
                            ),
                            child: Text(
                              r.symbol,
                              style: const TextStyle(color: Color(0xFFFFF9C4), fontSize: 18, fontWeight: FontWeight.bold),
                            ),
                          ),
                        ),
                      ),
                    );
                  }),
                ],
              ],
            ),
          ],
        ],
      ),
    );
  }

  Widget _buildResultRuneCard(({TraditionStation rune, bool isReversed, String positionTitle}) res, int index) {
    final r = res.rune;
    return Container(
      padding: const EdgeInsets.all(14),
      decoration: BoxDecoration(
        color: const Color(0xFF181C30),
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: const Color(0xFFFFD54F).withValues(alpha: 0.4)),
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            width: 44,
            height: 44,
            alignment: Alignment.center,
            decoration: BoxDecoration(
              color: const Color(0xFF232742),
              borderRadius: BorderRadius.circular(10),
              border: Border.all(color: const Color(0xFFFFD54F)),
            ),
            child: Text(
              r.symbol,
              style: const TextStyle(fontSize: 26, color: Color(0xFFFFD54F)),
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Expanded(
                      child: Text(
                        '#$index. ${res.positionTitle}: ${r.name}',
                        style: const TextStyle(color: Color(0xFFFFF9C4), fontSize: 14, fontWeight: FontWeight.bold),
                      ),
                    ),
                    if (res.isReversed)
                      Container(
                        padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
                        decoration: BoxDecoration(
                          color: const Color(0xFF5C1D1D),
                          borderRadius: BorderRadius.circular(6),
                          border: Border.all(color: const Color(0xFFEF5350)),
                        ),
                        child: const Text('Перевёрнутая', style: TextStyle(color: Color(0xFFFF8A80), fontSize: 9.5, fontWeight: FontWeight.bold)),
                      ),
                  ],
                ),
                const SizedBox(height: 4),
                Text(r.group, style: const TextStyle(color: Color(0xFF80DEEA), fontSize: 11)),
                const SizedBox(height: 6),
                Text(
                  r.lore,
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                  style: const TextStyle(color: Color(0xFFD1D5DB), fontSize: 12, height: 1.4),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}