import 'dart:collection';
import 'package:askiineverdie/src/core/util/deterministic_random.dart';

/// Minimal skeletal state to mirror Progress Quest structures.
///
/// Logic will be ported faithfully from the Delphi source; this file only
/// defines containers and helpers for deterministic RNG.
class GameState {
  GameState({
    required DeterministicRandom rng,
    Traits? traits,
    Stats? stats,
    Inventory? inventory,
    Equipment? equipment,
    SpellBook? spellBook,
    ProgressState? progress,
    QueueState? queue,
  }) : rng = DeterministicRandom.clone(rng),
       traits = traits ?? Traits.empty(),
       stats = stats ?? Stats.empty(),
       inventory = inventory ?? Inventory.empty(),
       equipment = equipment ?? Equipment.empty(),
       spellBook = spellBook ?? SpellBook.empty(),
       progress = progress ?? ProgressState.empty(),
       queue = queue ?? QueueState.empty();

  factory GameState.withSeed({
    required int seed,
    Traits? traits,
    Stats? stats,
    Inventory? inventory,
    Equipment? equipment,
    SpellBook? spellBook,
    ProgressState? progress,
    QueueState? queue,
  }) {
    return GameState(
      rng: DeterministicRandom(seed),
      traits: traits,
      stats: stats,
      inventory: inventory,
      equipment: equipment,
      spellBook: spellBook,
      progress: progress,
      queue: queue,
    );
  }

  final DeterministicRandom rng;
  final Traits traits;
  final Stats stats;
  final Inventory inventory;
  final Equipment equipment;
  final SpellBook spellBook;
  final ProgressState progress;
  final QueueState queue;

  GameState copyWith({
    DeterministicRandom? rng,
    Traits? traits,
    Stats? stats,
    Inventory? inventory,
    Equipment? equipment,
    SpellBook? spellBook,
    ProgressState? progress,
    QueueState? queue,
  }) {
    return GameState(
      rng: rng ?? DeterministicRandom.clone(this.rng),
      traits: traits ?? this.traits,
      stats: stats ?? this.stats,
      inventory: inventory ?? this.inventory,
      equipment: equipment ?? this.equipment,
      spellBook: spellBook ?? this.spellBook,
      progress: progress ?? this.progress,
      queue: queue ?? this.queue,
    );
  }
}

/// 태스크 타입 (원본 fTask.Caption 값들에 대응)
enum TaskType {
  neutral, // heading 등 일반 이동
  kill, // 몬스터 처치
  load, // 로딩/초기화
  plot, // 플롯 진행
  market, // 시장으로 이동 중
  sell, // 아이템 판매 중
  buying, // 장비 구매 중
}

class TaskInfo {
  const TaskInfo({
    required this.caption,
    required this.type,
    this.monsterBaseName,
    this.monsterPart,
  });

  final String caption;
  final TaskType type;

  /// 킬 태스크의 몬스터 기본 이름 (형용사 제외, 예: "Goblin")
  final String? monsterBaseName;

  /// 킬 태스크의 전리품 부위 (예: "claw", "tail", "*"는 WinItem)
  final String? monsterPart;

  factory TaskInfo.empty() =>
      const TaskInfo(caption: '', type: TaskType.neutral);

  TaskInfo copyWith({
    String? caption,
    TaskType? type,
    String? monsterBaseName,
    String? monsterPart,
  }) {
    return TaskInfo(
      caption: caption ?? this.caption,
      type: type ?? this.type,
      monsterBaseName: monsterBaseName ?? this.monsterBaseName,
      monsterPart: monsterPart ?? this.monsterPart,
    );
  }
}

class Traits {
  const Traits({
    required this.name,
    required this.race,
    required this.klass,
    required this.level,
    required this.motto,
    required this.guild,
  });

  final String name;
  final String race;
  final String klass;
  final int level;
  final String motto;
  final String guild;

  factory Traits.empty() => const Traits(
    name: '',
    race: '',
    klass: '',
    level: 1,
    motto: '',
    guild: '',
  );

  Traits copyWith({
    String? name,
    String? race,
    String? klass,
    int? level,
    String? motto,
    String? guild,
  }) {
    return Traits(
      name: name ?? this.name,
      race: race ?? this.race,
      klass: klass ?? this.klass,
      level: level ?? this.level,
      motto: motto ?? this.motto,
      guild: guild ?? this.guild,
    );
  }
}

class Stats {
  const Stats({
    required this.str,
    required this.con,
    required this.dex,
    required this.intelligence,
    required this.wis,
    required this.cha,
    required this.hpMax,
    required this.mpMax,
    this.hpCurrent,
    this.mpCurrent,
  });

  final int str;
  final int con;
  final int dex;
  final int intelligence;
  final int wis;
  final int cha;
  final int hpMax;
  final int mpMax;

  /// 현재 HP (null이면 hpMax와 동일)
  final int? hpCurrent;

  /// 현재 MP (null이면 mpMax와 동일)
  final int? mpCurrent;

  /// 실제 현재 HP 값
  int get hp => hpCurrent ?? hpMax;

  /// 실제 현재 MP 값
  int get mp => mpCurrent ?? mpMax;

  factory Stats.empty() => const Stats(
    str: 0,
    con: 0,
    dex: 0,
    intelligence: 0,
    wis: 0,
    cha: 0,
    hpMax: 0,
    mpMax: 0,
  );

  Stats copyWith({
    int? str,
    int? con,
    int? dex,
    int? intelligence,
    int? wis,
    int? cha,
    int? hpMax,
    int? mpMax,
    int? hpCurrent,
    int? mpCurrent,
  }) {
    return Stats(
      str: str ?? this.str,
      con: con ?? this.con,
      dex: dex ?? this.dex,
      intelligence: intelligence ?? this.intelligence,
      wis: wis ?? this.wis,
      cha: cha ?? this.cha,
      hpMax: hpMax ?? this.hpMax,
      mpMax: mpMax ?? this.mpMax,
      hpCurrent: hpCurrent ?? this.hpCurrent,
      mpCurrent: mpCurrent ?? this.mpCurrent,
    );
  }
}

class InventoryEntry {
  const InventoryEntry({required this.name, required this.count});

  final String name;
  final int count;

  InventoryEntry copyWith({String? name, int? count}) {
    return InventoryEntry(name: name ?? this.name, count: count ?? this.count);
  }
}

class Inventory {
  const Inventory({required this.gold, required this.items});

  final int gold;
  final List<InventoryEntry> items;

  factory Inventory.empty() => const Inventory(gold: 0, items: []);

  Inventory copyWith({int? gold, List<InventoryEntry>? items}) {
    return Inventory(gold: gold ?? this.gold, items: items ?? this.items);
  }
}

/// 장비 (원본 Main.dfm Equips ListView, 11개 슬롯)
class Equipment {
  const Equipment({
    required this.weapon,
    required this.shield,
    required this.helm,
    required this.hauberk,
    required this.brassairts,
    required this.vambraces,
    required this.gauntlets,
    required this.gambeson,
    required this.cuisses,
    required this.greaves,
    required this.sollerets,
    required this.bestIndex,
  });

  final String weapon; // 0: 무기
  final String shield; // 1: 방패
  final String helm; // 2: 투구
  final String hauberk; // 3: 사슬갑옷
  final String brassairts; // 4: 상완갑
  final String vambraces; // 5: 전완갑
  final String gauntlets; // 6: 건틀릿
  final String gambeson; // 7: 갬비슨
  final String cuisses; // 8: 허벅지갑
  final String greaves; // 9: 정강이갑
  final String sollerets; // 10: 철제신발

  /// 최고 아이템 슬롯 인덱스 (원본 Equips.Tag, 0-10)
  final int bestIndex;

  /// 슬롯 개수
  static const slotCount = 11;

  factory Equipment.empty() => const Equipment(
    weapon: 'Keyboard',
    shield: '',
    helm: '',
    hauberk: '',
    brassairts: '',
    vambraces: '',
    gauntlets: '',
    gambeson: '',
    cuisses: '',
    greaves: '',
    sollerets: '',
    bestIndex: 0,
  );

  /// 인덱스로 슬롯 값 가져오기
  String getByIndex(int index) {
    return switch (index) {
      0 => weapon,
      1 => shield,
      2 => helm,
      3 => hauberk,
      4 => brassairts,
      5 => vambraces,
      6 => gauntlets,
      7 => gambeson,
      8 => cuisses,
      9 => greaves,
      10 => sollerets,
      _ => '',
    };
  }

  /// 인덱스로 슬롯 값 설정한 새 Equipment 반환
  Equipment setByIndex(int index, String value) {
    return switch (index) {
      0 => copyWith(weapon: value),
      1 => copyWith(shield: value),
      2 => copyWith(helm: value),
      3 => copyWith(hauberk: value),
      4 => copyWith(brassairts: value),
      5 => copyWith(vambraces: value),
      6 => copyWith(gauntlets: value),
      7 => copyWith(gambeson: value),
      8 => copyWith(cuisses: value),
      9 => copyWith(greaves: value),
      10 => copyWith(sollerets: value),
      _ => this,
    };
  }

  Equipment copyWith({
    String? weapon,
    String? shield,
    String? helm,
    String? hauberk,
    String? brassairts,
    String? vambraces,
    String? gauntlets,
    String? gambeson,
    String? cuisses,
    String? greaves,
    String? sollerets,
    int? bestIndex,
  }) {
    return Equipment(
      weapon: weapon ?? this.weapon,
      shield: shield ?? this.shield,
      helm: helm ?? this.helm,
      hauberk: hauberk ?? this.hauberk,
      brassairts: brassairts ?? this.brassairts,
      vambraces: vambraces ?? this.vambraces,
      gauntlets: gauntlets ?? this.gauntlets,
      gambeson: gambeson ?? this.gambeson,
      cuisses: cuisses ?? this.cuisses,
      greaves: greaves ?? this.greaves,
      sollerets: sollerets ?? this.sollerets,
      bestIndex: bestIndex ?? this.bestIndex,
    );
  }
}

class SpellEntry {
  const SpellEntry({required this.name, required this.rank});

  final String name;
  final String rank; // e.g., Roman numerals

  SpellEntry copyWith({String? name, String? rank}) {
    return SpellEntry(name: name ?? this.name, rank: rank ?? this.rank);
  }
}

class SpellBook {
  const SpellBook({required this.spells});

  final List<SpellEntry> spells;

  factory SpellBook.empty() => const SpellBook(spells: []);

  SpellBook copyWith({List<SpellEntry>? spells}) {
    return SpellBook(spells: spells ?? this.spells);
  }
}

class ProgressBarState {
  const ProgressBarState({required this.position, required this.max});

  final int position;
  final int max;

  factory ProgressBarState.empty() =>
      const ProgressBarState(position: 0, max: 1);

  ProgressBarState copyWith({int? position, int? max}) {
    return ProgressBarState(
      position: position ?? this.position,
      max: max ?? this.max,
    );
  }
}

/// 히스토리 엔트리 (Plot/Quest 진행 기록)
class HistoryEntry {
  const HistoryEntry({required this.caption, required this.isComplete});

  /// 표시 텍스트 (예: "Prologue", "Act I", "Exterminate the Goblins")
  final String caption;

  /// 완료 여부 (원본 StateIndex: 0=진행중, 1=완료)
  final bool isComplete;

  HistoryEntry copyWith({String? caption, bool? isComplete}) {
    return HistoryEntry(
      caption: caption ?? this.caption,
      isComplete: isComplete ?? this.isComplete,
    );
  }
}

/// 현재 퀘스트 몬스터 정보 (원본 fQuest)
class QuestMonsterInfo {
  const QuestMonsterInfo({
    required this.monsterData,
    required this.monsterIndex,
  });

  /// 몬스터 데이터 문자열 (예: "Goblin|3|ear")
  final String monsterData;

  /// 몬스터 인덱스 (Config.monsters에서의 인덱스)
  final int monsterIndex;

  static const empty = QuestMonsterInfo(monsterData: '', monsterIndex: -1);
}

class ProgressState {
  const ProgressState({
    required this.task,
    required this.quest,
    required this.plot,
    required this.exp,
    required this.encumbrance,
    required this.currentTask,
    required this.plotStageCount,
    required this.questCount,
    this.plotHistory = const [],
    this.questHistory = const [],
    this.currentQuestMonster,
  });

  final ProgressBarState task;
  final ProgressBarState quest;
  final ProgressBarState plot;
  final ProgressBarState exp;
  final ProgressBarState encumbrance;
  final TaskInfo currentTask;
  final int plotStageCount;
  final int questCount;

  /// 플롯 히스토리 (Prologue, Act I, Act II, ...)
  final List<HistoryEntry> plotHistory;

  /// 퀘스트 히스토리 (완료된/진행중인 퀘스트 목록)
  final List<HistoryEntry> questHistory;

  /// 현재 퀘스트 몬스터 정보 (Exterminate 타입용)
  final QuestMonsterInfo? currentQuestMonster;

  factory ProgressState.empty() => ProgressState(
    task: ProgressBarState.empty(),
    quest: ProgressBarState.empty(),
    plot: ProgressBarState.empty(),
    exp: ProgressBarState.empty(),
    encumbrance: ProgressBarState.empty(),
    currentTask: TaskInfo.empty(),
    plotStageCount: 1, // Prologue
    questCount: 0,
    plotHistory: const [HistoryEntry(caption: 'Prologue', isComplete: false)],
    questHistory: const [],
    currentQuestMonster: null,
  );

  ProgressState copyWith({
    ProgressBarState? task,
    ProgressBarState? quest,
    ProgressBarState? plot,
    ProgressBarState? exp,
    ProgressBarState? encumbrance,
    TaskInfo? currentTask,
    int? plotStageCount,
    int? questCount,
    List<HistoryEntry>? plotHistory,
    List<HistoryEntry>? questHistory,
    QuestMonsterInfo? currentQuestMonster,
  }) {
    return ProgressState(
      task: task ?? this.task,
      quest: quest ?? this.quest,
      plot: plot ?? this.plot,
      exp: exp ?? this.exp,
      encumbrance: encumbrance ?? this.encumbrance,
      currentTask: currentTask ?? this.currentTask,
      plotStageCount: plotStageCount ?? this.plotStageCount,
      questCount: questCount ?? this.questCount,
      plotHistory: plotHistory ?? this.plotHistory,
      questHistory: questHistory ?? this.questHistory,
      currentQuestMonster: currentQuestMonster ?? this.currentQuestMonster,
    );
  }
}

class QueueEntry {
  const QueueEntry({
    required this.kind,
    required this.durationMillis,
    required this.caption,
    this.taskType = TaskType.neutral,
  });

  final QueueKind kind;
  final int durationMillis;
  final String caption;
  final TaskType taskType;
}

enum QueueKind { task, plot }

class QueueState {
  QueueState({Iterable<QueueEntry>? entries})
    : entries = Queue<QueueEntry>.from(entries ?? const []);

  final Queue<QueueEntry> entries;

  factory QueueState.empty() => QueueState(entries: const []);

  QueueState copyWith({Iterable<QueueEntry>? entries}) {
    return QueueState(entries: Queue<QueueEntry>.from(entries ?? this.entries));
  }
}