import 'dart:math' as math;

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show FilteringTextInputFormatter;

import 'package:asciineverdie/data/class_data.dart';
import 'package:asciineverdie/data/game_text_l10n.dart' as game_l10n;
import 'package:asciineverdie/data/race_data.dart';
import 'package:asciineverdie/l10n/app_localizations.dart';
import 'package:asciineverdie/src/core/model/class_traits.dart';
import 'package:asciineverdie/src/core/model/game_state.dart';
import 'package:asciineverdie/src/core/model/race_traits.dart';
import 'package:asciineverdie/src/core/util/deterministic_random.dart';
import 'package:asciineverdie/src/core/l10n/game_data_l10n.dart';
import 'package:asciineverdie/src/core/util/pq_logic.dart';
import 'package:asciineverdie/src/features/new_character/widgets/race_preview.dart';
import 'package:asciineverdie/src/shared/retro_colors.dart';
import 'package:asciineverdie/src/shared/widgets/retro_widgets.dart';

/// 캐릭터 생성 화면 (NewGuy.pas 포팅)
class NewCharacterScreen extends StatefulWidget {
  const NewCharacterScreen({super.key, this.onCharacterCreated});

  /// 캐릭터 생성 완료 시 호출되는 콜백
  /// testMode: 웹에서도 모바일 캐로셀 레이아웃 사용
  final void Function(GameState initialState, {bool testMode})?
  onCharacterCreated;

  @override
  State<NewCharacterScreen> createState() => _NewCharacterScreenState();
}

class _NewCharacterScreenState extends State<NewCharacterScreen> {
  final TextEditingController _nameController = TextEditingController();
  final ScrollController _raceScrollController = ScrollController();
  final ScrollController _klassScrollController = ScrollController();

  // 종족(races)과 직업(klasses) 목록 (Phase 5)
  final List<RaceTraits> _races = RaceData.all;
  final List<ClassTraits> _klasses = ClassData.all;

  // 선택된 종족/직업 인덱스
  int _selectedRaceIndex = 0;
  int _selectedKlassIndex = 0;

  // 능력치(stats)
  int _str = 0;
  int _con = 0;
  int _dex = 0;
  int _int = 0;
  int _wis = 0;
  int _cha = 0;

  // 롤 이력 (Unroll 기능용) - 원본 OldRolls TListBox
  static const int _maxRollHistory = 20; // 최대 저장 개수
  final List<int> _rollHistory = [];

  // 현재 RNG 시드 (Re-Roll 전 저장)
  int _currentSeed = 0;

  // 이름 생성용 RNG
  late DeterministicRandom _nameRng;

  // 치트 모드 (디버그 전용: 100x 터보 배속 활성화)
  bool _cheatsEnabled = false;

  // 굴리기 버튼 연속 클릭 방지
  bool _isRolling = false;

  @override
  void initState() {
    super.initState();

    // 초기 랜덤화
    final random = math.Random();
    _selectedRaceIndex = random.nextInt(_races.length);
    _selectedKlassIndex = random.nextInt(_klasses.length);

    // 초기 스탯 굴림
    _currentSeed = random.nextInt(0x7FFFFFFF);
    _nameRng = DeterministicRandom(random.nextInt(0x7FFFFFFF));
    _rollStats();

    // 초기 이름 생성
    _nameController.text = generateName(_nameRng);

    // 선택된 종족/직업으로 스크롤
    _scrollToSelectedItems();
  }

  @override
  void dispose() {
    _nameController.dispose();
    _raceScrollController.dispose();
    _klassScrollController.dispose();
    super.dispose();
  }

  /// 선택된 종족/직업 위치로 스크롤
  void _scrollToSelectedItems() {
    // ListTile 높이 약 48px (dense 모드)
    const itemHeight = 48.0;

    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (!mounted) return;

      // 스크롤 애니메이션 대신 즉시 점프 (WASM 모드 안정성)
      if (_raceScrollController.hasClients) {
        final raceOffset = _selectedRaceIndex * itemHeight;
        _raceScrollController.jumpTo(
          raceOffset.clamp(0.0, _raceScrollController.position.maxScrollExtent),
        );
      }
      if (_klassScrollController.hasClients) {
        final klassOffset = _selectedKlassIndex * itemHeight;
        _klassScrollController.jumpTo(
          klassOffset.clamp(
            0.0,
            _klassScrollController.position.maxScrollExtent,
          ),
        );
      }
    });
  }

  /// 스탯 굴림 (3d6 × 6)
  void _rollStats() {
    final rng = DeterministicRandom(_currentSeed);
    setState(() {
      _str = rollStat(rng);
      _con = rollStat(rng);
      _dex = rollStat(rng);
      _int = rollStat(rng);
      _wis = rollStat(rng);
      _cha = rollStat(rng);
    });
  }

  /// Re-Roll 버튼 클릭
  /// 원본 NewGuy.pas RerollClick: 스탯, 종족, 클래스 모두 랜덤화
  void _onReroll() {
    // 연속 클릭 방지
    if (_isRolling) return;
    _isRolling = true;

    // 현재 시드를 이력에 저장
    _rollHistory.insert(0, _currentSeed);

    // 최대 개수 초과 시 가장 오래된 항목 제거
    if (_rollHistory.length > _maxRollHistory) {
      _rollHistory.removeLast();
    }

    // 새 시드로 굴림
    final random = math.Random();
    _currentSeed = random.nextInt(0x7FFFFFFF);

    // 종족/클래스도 랜덤 선택
    setState(() {
      _selectedRaceIndex = random.nextInt(_races.length);
      _selectedKlassIndex = random.nextInt(_klasses.length);
    });

    _rollStats();

    // 선택된 종족/직업으로 스크롤
    _scrollToSelectedItems();

    // 짧은 딜레이 후 다시 클릭 가능
    Future.delayed(const Duration(milliseconds: 100), () {
      if (mounted) _isRolling = false;
    });
  }

  /// Unroll 버튼 클릭 (이전 롤로 복원)
  void _onUnroll() {
    if (_rollHistory.isEmpty) return;

    setState(() {
      _currentSeed = _rollHistory.removeAt(0);
    });
    _rollStats();
  }

  /// 이름 생성 버튼 클릭
  void _onGenerateName() {
    setState(() {
      _nameController.text = generateName(_nameRng);
    });
  }

  /// Total 값 계산
  int get _total => _str + _con + _dex + _int + _wis + _cha;

  /// Total 색상 결정 (원본 규칙)
  /// 63+18(81) 이상 = 빨강, 4*18(72) 초과 = 노랑
  /// 63-18(45) 이하 = 회색, 3*18(54) 미만 = 은색
  /// 그 외 = 흰색
  Color _getTotalColor() {
    final total = _total;
    if (total >= 81) return Colors.red;
    if (total > 72) return Colors.yellow;
    if (total <= 45) return Colors.grey;
    if (total < 54) return Colors.grey.shade400;
    return Colors.white;
  }

  /// Sold! 버튼 클릭 - 캐릭터 생성 완료
  /// 원본 Main.pas:1371-1388 RollCharacter 로직
  void _onSold() {
    final name = _nameController.text.trim();
    if (name.isEmpty) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text(game_l10n.uiEnterName)));
      return;
    }

    // 선택된 종족/클래스 (Phase 5)
    final selectedRace = _races[_selectedRaceIndex];
    final selectedClass = _klasses[_selectedKlassIndex];

    // 게임에 사용할 새 RNG 생성
    final gameSeed = math.Random().nextInt(0x7FFFFFFF);

    // HP/MP 초기값 계산
    // 원본 공식: Random(8) + CON/6 → 약 1~10 HP (너무 낮음)
    // 수정 공식: 65 + Random(8) + CON → 약 68~91 HP (사망률 ~10% 목표)
    // 이유: 원본 PQ는 "항상 승리"하지만 이 게임은 실제 전투로 사망 가능
    final hpMax = 65 + math.Random().nextInt(8) + _con;
    final mpMax = 30 + math.Random().nextInt(8) + _int;

    // 원본 Main.pas:1375-1379 - 기본 롤 값 그대로 저장 (보너스 없음)
    final finalStats = Stats(
      str: _str,
      con: _con,
      dex: _dex,
      intelligence: _int,
      wis: _wis,
      cha: _cha,
      hpMax: hpMax,
      mpMax: mpMax,
    );

    final traits = Traits(
      name: name,
      race: selectedRace.name,
      klass: selectedClass.name,
      level: 1,
      motto: '',
      guild: '',
      raceId: selectedRace.raceId,
      classId: selectedClass.classId,
    );

    // 초기 게임 상태 생성
    final initialState = GameState.withSeed(
      seed: gameSeed,
      traits: traits,
      stats: finalStats,
      inventory: Inventory.empty(),
      equipment: Equipment.empty(),
      skillBook: SkillBook.empty(),
      progress: ProgressState.empty(),
      queue: QueueState.empty(),
    );

    widget.onCharacterCreated?.call(initialState, testMode: _cheatsEnabled);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: RetroColors.deepBrown,
      appBar: AppBar(
        backgroundColor: RetroColors.darkBrown,
        title: Text(
          L10n.of(context).newCharacterTitle.toUpperCase(),
          style: const TextStyle(
            fontFamily: 'PressStart2P',
            fontSize: 12,
            color: RetroColors.gold,
          ),
        ),
        centerTitle: true,
        iconTheme: const IconThemeData(color: RetroColors.gold),
      ),
      body: SafeArea(
        top: false, // AppBar가 상단 처리
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              // 이름 입력 섹션
              _buildNameSection(),
              const SizedBox(height: 16),

              // 능력치 섹션
              _buildStatsSection(),
              const SizedBox(height: 16),

              // 종족 미리보기 (Phase 5: 종족별 캐릭터 애니메이션)
              RetroPanel(
                title: 'PREVIEW',
                padding: const EdgeInsets.all(8),
                child: Center(
                  child: RacePreview(raceId: _races[_selectedRaceIndex].raceId),
                ),
              ),
              const SizedBox(height: 16),

              // 종족/직업 선택 섹션
              Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(child: _buildRaceSection()),
                  const SizedBox(width: 16),
                  Expanded(child: _buildKlassSection()),
                ],
              ),
              const SizedBox(height: 16),

              // Sold! 버튼
              RetroTextButton(
                text: L10n.of(context).soldButton,
                icon: Icons.check,
                onPressed: _onSold,
              ),

              // 디버그 전용: 치트 모드 토글 (100x 터보 배속)
              if (kDebugMode) ...[
                const SizedBox(height: 16),
                GestureDetector(
                  onTap: () => setState(() => _cheatsEnabled = !_cheatsEnabled),
                  child: Container(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 12,
                      vertical: 8,
                    ),
                    decoration: BoxDecoration(
                      color: _cheatsEnabled
                          ? RetroColors.hpRed.withValues(alpha: 0.3)
                          : RetroColors.panelBg,
                      border: Border.all(
                        color: _cheatsEnabled
                            ? RetroColors.hpRed
                            : RetroColors.panelBorderInner,
                        width: 2,
                      ),
                    ),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        Icon(
                          _cheatsEnabled
                              ? Icons.bug_report
                              : Icons.bug_report_outlined,
                          size: 16,
                          color: _cheatsEnabled
                              ? RetroColors.hpRed
                              : RetroColors.textDisabled,
                        ),
                        const SizedBox(width: 8),
                        Text(
                          'DEBUG: TURBO MODE (20x)',
                          style: TextStyle(
                            fontFamily: 'PressStart2P',
                            fontSize: 8,
                            color: _cheatsEnabled
                                ? RetroColors.hpRed
                                : RetroColors.textDisabled,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildNameSection() {
    final l10n = L10n.of(context);
    return RetroPanel(
      title: 'NAME',
      child: Row(
        children: [
          Expanded(
            child: TextField(
              controller: _nameController,
              style: const TextStyle(
                fontFamily: 'PressStart2P',
                fontSize: 10,
                color: RetroColors.textLight,
              ),
              // 영문 알파벳만 허용 (공백 불가)
              inputFormatters: [
                FilteringTextInputFormatter.allow(RegExp(r'[a-zA-Z]')),
              ],
              decoration: InputDecoration(
                labelText: l10n.name,
                labelStyle: const TextStyle(
                  fontFamily: 'PressStart2P',
                  fontSize: 8,
                  color: RetroColors.gold,
                ),
                border: const OutlineInputBorder(
                  borderSide: BorderSide(color: RetroColors.panelBorderInner),
                ),
                enabledBorder: const OutlineInputBorder(
                  borderSide: BorderSide(color: RetroColors.panelBorderInner),
                ),
                focusedBorder: const OutlineInputBorder(
                  borderSide: BorderSide(color: RetroColors.gold, width: 2),
                ),
                counterStyle: const TextStyle(color: RetroColors.textDisabled),
              ),
              maxLength: 30,
            ),
          ),
          const SizedBox(width: 8),
          RetroIconButton(icon: Icons.casino, onPressed: _onGenerateName),
        ],
      ),
    );
  }

  Widget _buildStatsSection() {
    final l10n = L10n.of(context);
    return RetroPanel(
      title: 'STATS',
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // 스탯 그리드
          Row(
            children: [
              Expanded(child: _buildStatTile(l10n.statStr, _str)),
              Expanded(child: _buildStatTile(l10n.statCon, _con)),
              Expanded(child: _buildStatTile(l10n.statDex, _dex)),
            ],
          ),
          const SizedBox(height: 8),
          Row(
            children: [
              Expanded(child: _buildStatTile(l10n.statInt, _int)),
              Expanded(child: _buildStatTile(l10n.statWis, _wis)),
              Expanded(child: _buildStatTile(l10n.statCha, _cha)),
            ],
          ),
          const SizedBox(height: 12),

          // Total
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
            decoration: BoxDecoration(
              color: _getTotalColor().withValues(alpha: 0.2),
              border: Border.all(color: _getTotalColor(), width: 2),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  l10n.total.toUpperCase(),
                  style: const TextStyle(
                    fontFamily: 'PressStart2P',
                    fontSize: 8,
                    fontWeight: FontWeight.bold,
                    color: RetroColors.textLight,
                  ),
                ),
                Text(
                  '$_total',
                  style: TextStyle(
                    fontFamily: 'PressStart2P',
                    fontSize: 14,
                    fontWeight: FontWeight.bold,
                    color: _getTotalColor(),
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 12),

          // Roll 버튼들
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              RetroTextButton(
                text: l10n.unroll,
                icon: Icons.undo,
                onPressed: _rollHistory.isEmpty ? null : _onUnroll,
                isPrimary: false,
              ),
              const SizedBox(width: 16),
              RetroTextButton(
                text: l10n.roll,
                icon: Icons.casino,
                onPressed: _onReroll,
              ),
            ],
          ),
          if (_rollHistory.isNotEmpty)
            Padding(
              padding: const EdgeInsets.only(top: 8),
              child: Center(
                child: Text(
                  game_l10n.uiRollHistory(_rollHistory.length),
                  style: const TextStyle(
                    fontFamily: 'PressStart2P',
                    fontSize: 8,
                    color: RetroColors.textDisabled,
                  ),
                ),
              ),
            ),
        ],
      ),
    );
  }

  Widget _buildStatTile(String label, int value) {
    return Container(
      margin: const EdgeInsets.all(4),
      padding: const EdgeInsets.symmetric(vertical: 8),
      decoration: BoxDecoration(
        color: RetroColors.panelBgLight,
        border: Border.all(color: RetroColors.panelBorderInner),
      ),
      child: Column(
        children: [
          Text(
            label.toUpperCase(),
            style: const TextStyle(
              fontFamily: 'PressStart2P',
              fontSize: 8,
              color: RetroColors.gold,
            ),
          ),
          const SizedBox(height: 4),
          Text(
            '$value',
            style: const TextStyle(
              fontFamily: 'PressStart2P',
              fontSize: 12,
              fontWeight: FontWeight.bold,
              color: RetroColors.textLight,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildRaceSection() {
    return RetroPanel(
      title: 'RACE',
      child: SizedBox(
        height: 300,
        child: ListView.builder(
          controller: _raceScrollController,
          itemCount: _races.length,
          itemBuilder: (context, index) {
            final isSelected = index == _selectedRaceIndex;
            final race = _races[index];
            return GestureDetector(
              onTap: () => setState(() => _selectedRaceIndex = index),
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
                decoration: BoxDecoration(
                  color: isSelected ? RetroColors.panelBgLight : null,
                  border: isSelected
                      ? Border.all(color: RetroColors.gold, width: 1)
                      : null,
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(
                          isSelected ? Icons.arrow_right : Icons.remove,
                          size: 12,
                          color: isSelected
                              ? RetroColors.gold
                              : RetroColors.textDisabled,
                        ),
                        const SizedBox(width: 4),
                        Expanded(
                          child: Text(
                            GameDataL10n.getRaceName(context, race.name),
                            style: TextStyle(
                              fontFamily: 'PressStart2P',
                              fontSize: 8,
                              color: isSelected
                                  ? RetroColors.gold
                                  : RetroColors.textLight,
                            ),
                          ),
                        ),
                      ],
                    ),
                    if (isSelected) _buildRaceInfo(race),
                  ],
                ),
              ),
            );
          },
        ),
      ),
    );
  }

  /// 종족 정보 표시 (Phase 5)
  Widget _buildRaceInfo(RaceTraits race) {
    final statMods = <String>[];
    for (final entry in race.statModifiers.entries) {
      final sign = entry.value > 0 ? '+' : '';
      statMods.add('${_statName(entry.key)} $sign${entry.value}');
    }

    final passiveDesc = race.passives.isNotEmpty
        ? race.passives.map((p) => _translateRacePassive(p)).join(', ')
        : '';

    return Padding(
      padding: const EdgeInsets.only(left: 16, top: 4),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (statMods.isNotEmpty)
            Text(
              statMods.join(', '),
              style: const TextStyle(fontSize: 9, color: RetroColors.textLight),
            ),
          if (passiveDesc.isNotEmpty)
            Text(
              passiveDesc,
              style: const TextStyle(fontSize: 9, color: RetroColors.expGreen),
            ),
        ],
      ),
    );
  }

  /// 종족 패시브 설명 번역
  String _translateRacePassive(PassiveAbility passive) {
    final percent = (passive.value * 100).round();
    return switch (passive.type) {
      PassiveType.hpBonus => game_l10n.passiveHpBonus(percent),
      PassiveType.mpBonus => game_l10n.passiveMpBonus(percent),
      PassiveType.defenseBonus => game_l10n.passiveDefenseBonus(percent),
      PassiveType.magicDamageBonus => game_l10n.passiveMagicBonus(percent),
      PassiveType.criticalBonus => game_l10n.passiveCritBonus(percent),
      PassiveType.expBonus => passive.description,
      PassiveType.deathEquipmentPreserve => passive.description,
    };
  }

  String _statName(StatType type) {
    return switch (type) {
      StatType.str => game_l10n.statStr,
      StatType.con => game_l10n.statCon,
      StatType.dex => game_l10n.statDex,
      StatType.intelligence => game_l10n.statInt,
      StatType.wis => game_l10n.statWis,
      StatType.cha => game_l10n.statCha,
    };
  }

  Widget _buildKlassSection() {
    return RetroPanel(
      title: 'CLASS',
      child: SizedBox(
        height: 300,
        child: ListView.builder(
          controller: _klassScrollController,
          itemCount: _klasses.length,
          itemBuilder: (context, index) {
            final isSelected = index == _selectedKlassIndex;
            final klass = _klasses[index];
            return GestureDetector(
              onTap: () => setState(() => _selectedKlassIndex = index),
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
                decoration: BoxDecoration(
                  color: isSelected ? RetroColors.panelBgLight : null,
                  border: isSelected
                      ? Border.all(color: RetroColors.gold, width: 1)
                      : null,
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(
                          isSelected ? Icons.arrow_right : Icons.remove,
                          size: 12,
                          color: isSelected
                              ? RetroColors.gold
                              : RetroColors.textDisabled,
                        ),
                        const SizedBox(width: 4),
                        Expanded(
                          child: Text(
                            GameDataL10n.getKlassName(context, klass.name),
                            style: TextStyle(
                              fontFamily: 'PressStart2P',
                              fontSize: 8,
                              color: isSelected
                                  ? RetroColors.gold
                                  : RetroColors.textLight,
                            ),
                          ),
                        ),
                      ],
                    ),
                    if (isSelected) _buildClassInfo(klass),
                  ],
                ),
              ),
            );
          },
        ),
      ),
    );
  }

  /// 클래스 정보 표시 (Phase 5)
  Widget _buildClassInfo(ClassTraits klass) {
    final statMods = <String>[];
    for (final entry in klass.statModifiers.entries) {
      final sign = entry.value > 0 ? '+' : '';
      statMods.add('${_statName(entry.key)} $sign${entry.value}');
    }

    final passiveDesc = klass.passives.isNotEmpty
        ? klass.passives.map((p) => _translateClassPassive(p)).join(', ')
        : '';

    return Padding(
      padding: const EdgeInsets.only(left: 16, top: 4),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (statMods.isNotEmpty)
            Text(
              statMods.join(', '),
              style: const TextStyle(fontSize: 9, color: RetroColors.textLight),
            ),
          if (passiveDesc.isNotEmpty)
            Text(
              passiveDesc,
              style: const TextStyle(fontSize: 9, color: RetroColors.expGreen),
            ),
        ],
      ),
    );
  }

  /// 클래스 패시브 설명 번역
  String _translateClassPassive(ClassPassive passive) {
    final percent = (passive.value * 100).round();
    return switch (passive.type) {
      ClassPassiveType.hpBonus => game_l10n.passiveHpBonus(percent),
      ClassPassiveType.physicalDamageBonus => game_l10n.passivePhysicalBonus(
        percent,
      ),
      ClassPassiveType.defenseBonus => game_l10n.passiveDefenseBonus(percent),
      ClassPassiveType.magicDamageBonus => game_l10n.passiveMagicBonus(percent),
      ClassPassiveType.evasionBonus => game_l10n.passiveEvasionBonus(percent),
      ClassPassiveType.criticalBonus => game_l10n.passiveCritBonus(percent),
      ClassPassiveType.postCombatHeal => game_l10n.passiveHpRegen(percent),
      ClassPassiveType.healingBonus => passive.description,
      ClassPassiveType.multiAttack => passive.description,
      ClassPassiveType.firstStrikeBonus => passive.description,
    };
  }
}