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

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

  @override
  State<HomeSearchScreen> createState() => _HomeSearchScreenState();
}

class _HomeSearchScreenState extends State<HomeSearchScreen> {
  final _repo = WordsRepository();
  final _searchController = TextEditingController();
  final _questionController = TextEditingController();
  final _focusNode = FocusNode();

  WordItem? _currentWord;
  String? _activeHistoryId;
  List<WordItem> _searchResults = [];
  bool _showKeypad = true;

  @override
  void initState() {
    super.initState();
    // Do NOT show word by default until user interacts or starts a session
    _searchController.addListener(_onSearchChanged);
  }

  @override
  void dispose() {
    _searchController.removeListener(_onSearchChanged);
    _searchController.dispose();
    _questionController.dispose();
    _focusNode.dispose();
    super.dispose();
  }

  void _onSearchChanged() {
    final query = _searchController.text.trim();
    if (query.isEmpty) {
      setState(() {
        _searchResults = [];
      });
      return;
    }

    final results = _repo.search(query);
    setState(() {
      _searchResults = results;
      if (results.isNotEmpty) {
        _setWord(results.first, recordHistory: true);
      }
    });
  }

  Future<void> _setWord(WordItem word, {bool updateText = false, bool recordHistory = true}) async {
    final question = _questionController.text.trim();
    String? newHistId;

    if (recordHistory) {
      newHistId = DateTime.now().millisecondsSinceEpoch.toString();
      final entry = HistoryEntry(
        id: newHistId,
        timestamp: DateTime.now(),
        word: word.word,
        sessionNumber: word.sessionNumber,
        partOfSpeech: word.partOfSpeech,
        symbolicMeaning: word.description,
        readingType: 'Жребий номера',
        question: question.isNotEmpty ? question : null,
      );
      await _repo.addHistoryEntry(entry);
    }

    setState(() {
      _currentWord = word;
      _activeHistoryId = newHistId ?? _activeHistoryId;
      if (updateText) {
        _searchController.text = word.sessionNumber.toString();
      }
    });
    HapticFeedback.selectionClick();
  }

  void _onKeypadTap(String val) {
    HapticFeedback.lightImpact();
    String currentText = _searchController.text;

    if (val == 'C') {
      _searchController.clear();
      return;
    }

    if (val == '⌫') {
      if (currentText.isNotEmpty) {
        _searchController.text = currentText.substring(0, currentText.length - 1);
        _searchController.selection = TextSelection.fromPosition(
          TextPosition(offset: _searchController.text.length),
        );
      }
      return;
    }

    // Append digit
    if (currentText.length >= 3) {
      _searchController.text = val;
    } else {
      final newText = currentText + val;
      final num = int.tryParse(newText);
      if (num != null && num <= 999) {
        _searchController.text = newText;
      } else {
        _searchController.text = val;
      }
    }

    _searchController.selection = TextSelection.fromPosition(
      TextPosition(offset: _searchController.text.length),
    );
  }

  void _startNewSessionDraw() {
    final rnd = _repo.getRandomWord();
    _setWord(rnd, updateText: true, recordHistory: true);
  }

  void _resetToWelcome() {
    setState(() {
      _currentWord = null;
      _searchController.clear();
      _searchResults = [];
    });
  }

  void _goToNext() {
    if (_currentWord == null) return;
    final next = _repo.getNextWord(_currentWord!.sessionNumber);
    _setWord(next, updateText: true, recordHistory: false);
  }

  void _goToPrevious() {
    if (_currentWord == null) return;
    final prev = _repo.getPreviousWord(_currentWord!.sessionNumber);
    _setWord(prev, updateText: true, recordHistory: false);
  }

  void _reshuffleSession() {
    _repo.reshuffleSessionNumbers();
    setState(() {
      _currentWord = null;
      _searchController.clear();
      _searchResults = [];
    });
    HapticFeedback.heavyImpact();
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: const Row(
          children: [
            GradientStar(size: 20),
            SizedBox(width: 10),
            Expanded(
              child: Text(
                'Случайный порядок 1000 чисел перетасован заново!',
                style: TextStyle(fontWeight: FontWeight.w600),
              ),
            ),
          ],
        ),
        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: const Row(
          children: [
            GradientStar(size: 24),
            SizedBox(width: 10),
            Text(
              'Оракул 999',
              style: TextStyle(
                fontSize: 20,
                fontWeight: FontWeight.w900,
                letterSpacing: 0.5,
              ),
            ),
          ],
        ),
        actions: [
          if (_currentWord != null)
            IconButton(
              tooltip: 'Новый вопрос / Сброс',
              icon: const Icon(Icons.refresh_rounded),
              onPressed: _resetToWelcome,
            ),
          IconButton(
            tooltip: 'Перетасовать числа (#000..#999)',
            icon: const Icon(Icons.shuffle_rounded),
            onPressed: _reshuffleSession,
          ),
          IconButton(
            tooltip: _showKeypad ? 'Скрыть панель' : 'Показать панель',
            icon: Icon(_showKeypad ? Icons.dialpad_outlined : Icons.dialpad),
            onPressed: () {
              setState(() => _showKeypad = !_showKeypad);
            },
          ),
        ],
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              // Question Input Field
              TextField(
                controller: _questionController,
                decoration: InputDecoration(
                  labelText: 'Ваш вопрос или намерение (необязательно)',
                  hintText: 'Например: В чем скрытый потенциал ситуации?',
                  prefixIcon: const Icon(Icons.help_outline_rounded, color: Color(0xFFFFD54F), size: 20),
                  suffixIcon: _questionController.text.isNotEmpty
                      ? IconButton(
                          icon: const Icon(Icons.clear, size: 18),
                          onPressed: () => _questionController.clear(),
                        )
                      : null,
                  filled: true,
                  fillColor: isDark ? const Color(0xFF17192C) : theme.colorScheme.surfaceContainerHigh,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(16),
                    borderSide: BorderSide(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.25),
                    ),
                  ),
                  enabledBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(16),
                    borderSide: BorderSide(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.2),
                    ),
                  ),
                  focusedBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(16),
                    borderSide: const BorderSide(
                      color: Color(0xFFFFD54F),
                      width: 1.5,
                    ),
                  ),
                ),
              ),

              const SizedBox(height: 10),

              // Search & Number Input Bar
              TextField(
                controller: _searchController,
                focusNode: _focusNode,
                keyboardType: TextInputType.text,
                decoration: InputDecoration(
                  labelText: 'Введите число (#000..#999) или слово',
                  hintText: 'Например: 777 или огонь',
                  prefixIcon: const Padding(
                    padding: EdgeInsets.symmetric(horizontal: 12),
                    child: GradientStar(size: 18),
                  ),
                  suffixIcon: _searchController.text.isNotEmpty
                      ? IconButton(
                          icon: const Icon(Icons.clear_rounded),
                          onPressed: () {
                            _searchController.clear();
                            _focusNode.unfocus();
                          },
                        )
                      : null,
                  filled: true,
                  fillColor: isDark
                      ? const Color(0xFF1B1D30)
                      : theme.colorScheme.surfaceContainerHighest.withValues(alpha: 0.4),
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(18),
                    borderSide: BorderSide(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.3),
                    ),
                  ),
                  enabledBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(18),
                    borderSide: BorderSide(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.25),
                    ),
                  ),
                  focusedBorder: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(18),
                    borderSide: const BorderSide(
                      color: Color(0xFFFFD54F),
                      width: 1.8,
                    ),
                  ),
                ),
              ),

              // Search matches dropdown list
              if (_searchResults.length > 1 && _searchController.text.isNotEmpty) ...[
                const SizedBox(height: 8),
                Container(
                  constraints: const BoxConstraints(maxHeight: 140),
                  decoration: BoxDecoration(
                    color: isDark ? const Color(0xFF161828) : theme.colorScheme.surface,
                    borderRadius: BorderRadius.circular(16),
                    border: Border.all(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.3),
                    ),
                  ),
                  child: ListView.separated(
                    shrinkWrap: true,
                    padding: const EdgeInsets.symmetric(vertical: 4),
                    itemCount: _searchResults.length > 10 ? 10 : _searchResults.length,
                    separatorBuilder: (_, _) => const Divider(height: 1),
                    itemBuilder: (context, idx) {
                      final item = _searchResults[idx];
                      final isSelected = item.sessionNumber == _currentWord?.sessionNumber;
                      return ListTile(
                        dense: true,
                        selected: isSelected,
                        leading: GradientStarBadge(
                          text: '#${item.formattedSessionNumber}',
                          size: 14,
                        ),
                        title: Text(
                          item.word.toUpperCase(),
                          style: const TextStyle(fontWeight: FontWeight.bold),
                        ),
                        subtitle: Text(
                          item.description,
                          maxLines: 1,
                          overflow: TextOverflow.ellipsis,
                          style: const TextStyle(fontSize: 11),
                        ),
                        trailing: Text(
                          item.partOfSpeech,
                          style: TextStyle(
                            fontSize: 11,
                            color: theme.colorScheme.outline,
                          ),
                        ),
                        onTap: () {
                          _setWord(item, updateText: false, recordHistory: true);
                        },
                      );
                    },
                  ),
                ),
              ],

              const SizedBox(height: 14),

              // Welcome Idle State OR Active Word Card
              if (_currentWord == null) ...[
                // Welcome Initiation Card
                Container(
                  padding: const EdgeInsets.all(22),
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [
                        const Color(0xFF1F223B),
                        const Color(0xFF131526),
                      ],
                    ),
                    borderRadius: BorderRadius.circular(24),
                    border: Border.all(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.35),
                      width: 1.2,
                    ),
                    boxShadow: [
                      BoxShadow(
                        color: const Color(0xFFFFD54F).withValues(alpha: 0.1),
                        blurRadius: 16,
                      ),
                    ],
                  ),
                  child: Column(
                    children: [
                      const GradientStar(size: 44),
                      const SizedBox(height: 14),
                      const Text(
                        'СВЯЩЕННЫЙ ЖРЕБИЙ ОРАКУЛА',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.w900,
                          letterSpacing: 1.0,
                          color: Color(0xFFFFF9C4),
                        ),
                      ),
                      const SizedBox(height: 10),
                      Text(
                        'Сформулируйте в мыслях или запишите сверху ваш вопрос, затем нажмите кнопку или наберите номер от 000 до 999 для раскрытия символического ключа.',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 13,
                          height: 1.45,
                          color: theme.colorScheme.onSurface.withValues(alpha: 0.85),
                        ),
                      ),
                      const SizedBox(height: 18),
                      FilledButton.icon(
                        onPressed: _startNewSessionDraw,
                        icon: const GradientStar(size: 20),
                        label: const Text(
                          'НАЧАТЬ СЕССИЮ / БРОСИТЬ ЖРЕБИЙ',
                          style: TextStyle(
                            fontWeight: FontWeight.w900,
                            letterSpacing: 0.5,
                          ),
                        ),
                        style: FilledButton.styleFrom(
                          backgroundColor: const Color(0xFF2A2D4A),
                          foregroundColor: const Color(0xFFFFF9C4),
                          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
                          shape: RoundedRectangleBorder(
                            borderRadius: BorderRadius.circular(18),
                            side: const BorderSide(
                              color: Color(0xFFFFD54F),
                              width: 1.2,
                            ),
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ] else ...[
                // Main Sacred Word Card Display
                AnimatedSwitcher(
                  duration: const Duration(milliseconds: 300),
                  transitionBuilder: (child, animation) {
                    return FadeTransition(
                      opacity: animation,
                      child: SlideTransition(
                        position: Tween<Offset>(
                          begin: const Offset(0.0, 0.04),
                          end: Offset.zero,
                        ).animate(animation),
                        child: child,
                      ),
                    );
                  },
                  child: WordCardWidget(
                    key: ValueKey('${_currentWord!.id}_${_currentWord!.sessionNumber}'),
                    word: _currentWord!,
                    question: _questionController.text.trim(),
                    historyEntryId: _activeHistoryId,
                    onNext: _goToNext,
                    onPrevious: _goToPrevious,
                    onRandom: _startNewSessionDraw,
                  ),
                ),
              ],

              const SizedBox(height: 14),

              // Interactive Numeric Keypad
              if (_showKeypad) ...[
                Container(
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    color: isDark
                        ? const Color(0xFF17192A)
                        : theme.colorScheme.surfaceContainerLow,
                    borderRadius: BorderRadius.circular(20),
                    border: Border.all(
                      color: const Color(0xFFFFD54F).withValues(alpha: 0.25),
                    ),
                  ),
                  child: Column(
                    children: [
                      Row(
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          const Row(
                            children: [
                              GradientStar(size: 14),
                              SizedBox(width: 6),
                              Text(
                                'Случайный жребий числа:',
                                style: TextStyle(
                                  fontSize: 12,
                                  fontWeight: FontWeight.w700,
                                  color: Color(0xFFFFD54F),
                                ),
                              ),
                            ],
                          ),
                          Text(
                            '000 — 999',
                            style: TextStyle(
                              fontSize: 11,
                              color: theme.colorScheme.outline,
                            ),
                          ),
                        ],
                      ),
                      const SizedBox(height: 10),
                      _buildKeypadRow(['1', '2', '3']),
                      const SizedBox(height: 8),
                      _buildKeypadRow(['4', '5', '6']),
                      const SizedBox(height: 8),
                      _buildKeypadRow(['7', '8', '9']),
                      const SizedBox(height: 8),
                      _buildKeypadRow(['C', '0', '⌫']),
                    ],
                  ),
                ),
                const SizedBox(height: 16),
              ],
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildKeypadRow(List<String> keys) {
    return Row(
      children: keys.map((key) {
        final isSpecial = key == 'C' || key == '⌫';
        final theme = Theme.of(context);
        final isDark = theme.brightness == Brightness.dark;

        return Expanded(
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: 4),
            child: Material(
              color: isSpecial
                  ? const Color(0xFF2A2D4A)
                  : isDark
                      ? const Color(0xFF20233A)
                      : theme.colorScheme.surface,
              borderRadius: BorderRadius.circular(14),
              elevation: 1,
              child: InkWell(
                onTap: () => _onKeypadTap(key),
                borderRadius: BorderRadius.circular(14),
                child: Container(
                  height: 46,
                  alignment: Alignment.center,
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(14),
                    border: Border.all(
                      color: isSpecial
                          ? const Color(0xFFFFD54F).withValues(alpha: 0.4)
                          : Colors.white10,
                    ),
                  ),
                  child: Text(
                    key,
                    style: TextStyle(
                      fontSize: 20,
                      fontWeight: FontWeight.bold,
                      color: isSpecial
                          ? const Color(0xFFFFF9C4)
                          : isDark
                              ? Colors.white
                              : Colors.black87,
                    ),
                  ),
                ),
              ),
            ),
          ),
        );
      }).toList(),
    );
  }
}