import {
  AnimationState,
  Character,
  CharacterConversationStyle,
  Encounter,
  GameState,
  InventoryItem,
  ItemRarity,
  NpcAnswerMode,
  NpcBattleMode,
  NpcDisclosureStage,
  NpcInteractionAction,
  NpcPersistentState,
  NpcWarmthStage,
  QuestLogEntry,
  SceneMonster,
  ScenePresetInfo,
  StoryMoment,
  StoryOption,
  WorldType,
} from '../types';
import {
  buildRelationState,
  resolveAttributeSchema,
  scoreAttributeFit,
} from './attributeResolver';
import {
  getCharacterById,
  getCharacterEquipment,
  getCharacterMaxHp,
  getInventoryItems,
  resolveEncounterRecruitCharacter,
} from './characterPresets';
import {
  buildCustomWorldStarterEquipmentItems,
  buildCustomWorldStarterInventoryItems,
} from './customWorldCharacterLoadout';
import {
  buildRuntimeCustomWorldInventoryItems,
  getRuntimeCustomWorldProfile,
} from './customWorldRuntime';
import {
  formatCurrency,
  getDiscountTierForAffinity,
  getInventoryItemValue,
  getNpcPurchasePrice,
} from './economy';
import {
  NPC_CHAT_FUNCTION,
  NPC_FIGHT_FUNCTION,
  NPC_GIFT_FUNCTION,
  NPC_HELP_FUNCTION,
  NPC_LEAVE_FUNCTION,
  NPC_QUEST_ACCEPT_FUNCTION,
  NPC_QUEST_TURN_IN_FUNCTION,
  NPC_RECRUIT_FUNCTION,
  NPC_SPAR_FUNCTION,
  NPC_TRADE_FUNCTION,
} from './functionCatalog';
import { getMonsterPresetById } from './hostileNpcPresets';
import {
  buildChatAffinityOutcome,
  buildEncounterAttributeRumors,
  buildGiftAffinityInsight,
  buildRecruitmentInsight,
  type GiftAffinityInsight,
} from './npcAttributeInsights';
import {
  buildQuestAcceptDetail,
  buildQuestForEncounter,
  buildQuestTurnInDetail,
  getQuestForIssuer,
} from './questFlow';
import {
  buildLooseRuntimeItemGenerationContext,
  buildRuntimeItemGenerationContext,
} from './runtimeItemContext';
import {
  buildDirectedRuntimeReward,
  buildRuntimeInventoryStock,
  generateDirectedRuntimeReward,
} from './runtimeItemDirector';
import { flattenDirectedRuntimeRewardItems } from './runtimeItemNarrative';
import {
  getStoryOptionPriority,
  sortStoryOptionsByPriority,
} from './stateFunctions';

export type NpcHelpReward = {
  hp?: number;
  mana?: number;
  cooldownBonus?: number;
  items: InventoryItem[];
  storyHint?: string;
};

export type GiftCandidate = {
  item: InventoryItem;
  affinityGain: number;
  attributeInsight?: GiftAffinityInsight | null;
};

export type TradeCheckResult = {
  canBarter: boolean;
  canPurchase: boolean;
  canAcquire: boolean;
  offeredValue: number;
  requiredValue: number;
  purchasePrice: number;
  discountTier: number;
  currencyShortfall: number;
};

export const MAX_COMPANIONS = 2;
export const NPC_RECRUIT_AFFINITY = 60;
export const NPC_SPAR_AFFINITY_GAIN = 3;

const IDLE_VISUALS = {
  playerAnimation: AnimationState.IDLE,
  playerMoveMeters: 0,
  playerOffsetY: 0,
  playerFacing: 'right' as const,
  scrollWorld: false,
  monsterChanges: [],
};

const RARITY_SCORES: Record<ItemRarity, number> = {
  common: 1,
  uncommon: 2,
  rare: 3,
  epic: 4,
  legendary: 5,
};

const RARITY_LABELS: Record<ItemRarity, string> = {
  common: '普通',
  uncommon: '优秀',
  rare: '稀有',
  epic: '史诗',
  legendary: '传说',
};

function makeItemId(prefix: string, category: string, name: string) {
  return `${prefix}:${encodeURIComponent(`${category}-${name}`)}`;
}

function inferItemRarity(category: string, name: string): ItemRarity {
  if (/传说|神|圣|皇|王|古遗|秘宝/u.test(name)) return 'legendary';
  if (
    /史诗|徽章|密卷|遗物|星盘|古卷|符印|令牌/u.test(name) ||
    /稀有/u.test(category)
  )
    return 'epic';
  if (
    /专属/u.test(category) ||
    /剑|弓|刃|甲|盾|拳套|护符|宝珠|灵石/u.test(name)
  )
    return 'rare';
  if (/药|丹|卷|图|符|晶|矿|皮/u.test(name) || /材料/u.test(category))
    return 'uncommon';
  return 'common';
}

function inferItemTags(category: string, name: string, slot?: string) {
  const tags = new Set<string>();

  if (/药|丹|绷带|膏/u.test(name) || /消耗品/u.test(category))
    tags.add('healing');
  if (/灵|蓝|符|卷/u.test(name)) tags.add('mana');
  if (/剑|弓|刃|刀|枪|拳套|锤/u.test(name) || /武器/u.test(slot ?? ''))
    tags.add('weapon');
  if (/甲|盾|护臂|护甲/u.test(name) || /护甲/u.test(slot ?? ''))
    tags.add('armor');
  if (
    /卷|图|徽章|令牌|宝珠| relic /iu.test(name) ||
    /稀有|专属/u.test(category)
  )
    tags.add('relic');
  if (/矿|石|皮|木|草/u.test(name) || /材料/u.test(category))
    tags.add('material');
  if (tags.size === 0) tags.add('general');

  return [...tags];
}

function buildInventoryItem(
  prefix: string,
  category: string,
  name: string,
  quantity: number,
  rarity?: ItemRarity,
  tags?: string[],
) {
  return {
    id: makeItemId(prefix, category, name),
    category,
    name,
    quantity,
    rarity: rarity ?? inferItemRarity(category, name),
    tags: tags ?? inferItemTags(category, name),
  } satisfies InventoryItem;
}

function isIdentitySensitiveInventoryItem(item: InventoryItem) {
  return Boolean(
    item.runtimeMetadata ||
      item.equipmentSlotId ||
      item.buildProfile ||
      item.statProfile ||
      item.attributeResonance ||
      item.category.includes('专属') ||
      item.rarity === 'epic' ||
      item.rarity === 'legendary',
  );
}

function buildInventoryMergeKey(item: InventoryItem) {
  if (isIdentitySensitiveInventoryItem(item)) {
    return `identity:${item.id}`;
  }

  const buildBuffKey = (item.useProfile?.buildBuffs ?? [])
    .map((buff) => `${buff.name}:${buff.durationTurns}:${buff.tags.join('|')}`)
    .join(',');
  return [
    item.category,
    item.name,
    item.rarity,
    [...item.tags].sort().join('|'),
    item.useProfile?.hpRestore ?? 0,
    item.useProfile?.manaRestore ?? 0,
    item.useProfile?.cooldownReduction ?? 0,
    buildBuffKey,
  ].join('::');
}

function mergeInventory(items: InventoryItem[]) {
  const merged = new Map<string, InventoryItem>();

  for (const item of items) {
    const key = buildInventoryMergeKey(item);
    const existing = merged.get(key);
    if (existing) {
      merged.set(key, {
        ...existing,
        quantity: existing.quantity + item.quantity,
        tags: [...new Set([...existing.tags, ...item.tags])],
        runtimeMetadata:
          existing.runtimeMetadata ?? item.runtimeMetadata ?? null,
      });
    } else {
      merged.set(key, {
        ...item,
        tags: [...new Set(item.tags)],
      });
    }
  }

  return [...merged.values()];
}

function buildCharacterInventory(
  character: Character,
  worldType: WorldType | null,
) {
  if (worldType === WorldType.CUSTOM && getRuntimeCustomWorldProfile()) {
    return sortInventoryItems(buildCustomWorldStarterInventoryItems(character));
  }

  const packItems = getInventoryItems(character, worldType).map((item) =>
    buildInventoryItem('player', item.category, item.name, item.quantity),
  );
  return sortInventoryItems(mergeInventory(packItems));
}

function buildCharacterNpcInventory(
  character: Character,
  worldType: WorldType | null,
) {
  if (worldType === WorldType.CUSTOM && getRuntimeCustomWorldProfile()) {
    const starterEquipment = buildCustomWorldStarterEquipmentItems(character);
    const starterInventory = buildCustomWorldStarterInventoryItems(character);
    return sortInventoryItems(
      mergeInventory([
        ...(Object.values(starterEquipment).filter(Boolean) as InventoryItem[]),
        ...starterInventory,
      ]),
    );
  }

  const equipmentItems = getCharacterEquipment(character).map((item) =>
    buildInventoryItem(
      `npc-${character.id}`,
      item.slot,
      item.item,
      1,
      item.rarity === '史诗'
        ? 'epic'
        : item.rarity === '稀有'
          ? 'rare'
          : 'common',
      inferItemTags(item.slot, item.item, item.slot),
    ),
  );
  const packItems = getInventoryItems(character, worldType).map((item) =>
    buildInventoryItem(
      `npc-${character.id}`,
      item.category,
      item.name,
      item.quantity,
    ),
  );
  return sortInventoryItems(mergeInventory([...equipmentItems, ...packItems]));
}

function getRoleSource(encounter: Encounter) {
  return `${encounter.context} ${encounter.npcName}`;
}

function getEncounterConversationStyle(
  encounter: Encounter,
): CharacterConversationStyle {
  const recruitCharacter = resolveEncounterRecruitCharacter(encounter);
  return (
    recruitCharacter?.conversationStyle ?? {
      guardStyle: 'measured',
      warmStyle: 'steady',
      truthStyle: 'fragmented',
    }
  );
}

function getRuntimeTradeKinds(encounter: Encounter) {
  const source = getRoleSource(encounter);

  if (/摊主|商|军需/u.test(source))
    return ['consumable', 'material', 'relic', 'equipment'] as const;
  if (/渡|舟/u.test(source))
    return ['material', 'relic', 'consumable', 'relic'] as const;
  if (/猎/u.test(source))
    return ['material', 'consumable', 'equipment', 'relic'] as const;
  if (/书|学|碑|墓/u.test(source))
    return ['relic', 'material', 'consumable', 'quest'] as const;
  if (/守|卫|弟子/u.test(source))
    return ['equipment', 'equipment', 'consumable', 'relic'] as const;

  return ['consumable', 'material', 'relic', 'equipment'] as const;
}

function isRuntimeTradeDrivenRoleNpc(encounter: Encounter) {
  return !encounter.characterId && !encounter.monsterPresetId;
}

function buildRuntimeTradeSeedKey(
  encounter: Encounter,
  sceneId?: string | null,
) {
  return `npc-role:${encounter.id ?? encounter.npcName}:${encounter.context}:${sceneId ?? 'scene'}`;
}

function buildNpcTradeStockSignature(
  state: GameState,
  encounter: Encounter,
) {
  const context = buildRuntimeItemGenerationContext({
    state,
    generationChannel: 'npc_trade',
    encounter,
  });

  return [
    context.worldType ?? 'unknown-world',
    encounter.id ?? encounter.npcName,
    context.playerBuildTags.join('|'),
    context.playerEquipmentTags.join('|'),
  ].join('::');
}

function buildRuntimeTradeStock(
  encounter: Encounter,
  context: ReturnType<typeof buildRuntimeItemGenerationContext>
    | ReturnType<typeof buildLooseRuntimeItemGenerationContext>,
) {
  return buildRuntimeInventoryStock(context, {
    seedKey: buildRuntimeTradeSeedKey(encounter, context.sceneId),
    itemCount: 4,
    fixedKinds: [...getRuntimeTradeKinds(encounter)],
  });
}

function buildRoleInventory(
  encounter: Encounter,
  worldType: WorldType | null = WorldType.WUXIA,
  state?: GameState | null,
) {
  if (getRuntimeCustomWorldProfile()) {
    return sortInventoryItems(
      buildRuntimeCustomWorldInventoryItems(
        `npc-role:${encounter.id ?? encounter.npcName}:${encounter.context}`,
        {
          count: 4,
          categories: ['消耗品', '材料', '拥有品', '食物', '专属物品'],
        },
      ),
    );
  }

  const runtimeContext = state
    ? buildRuntimeItemGenerationContext({
        state,
        generationChannel: 'npc_trade',
        encounter,
      })
    : buildLooseRuntimeItemGenerationContext({
        worldType,
        encounter,
        generationChannel: 'npc_trade',
        playerCharacterId: 'npc-trade-preview',
        playerBuildTags: getNpcPreferenceTags(encounter),
      });
  const runtimeStock = buildRuntimeTradeStock(encounter, runtimeContext);

  if (runtimeStock.length > 0) {
    return sortInventoryItems(runtimeStock);
  }

  const source = getRoleSource(encounter);

  if (/摊主|商|军需/u.test(source)) {
    return sortInventoryItems([
      buildInventoryItem('npc-role', '消耗品', '疗伤丹', 3, 'uncommon', [
        'healing',
      ]),
      buildInventoryItem('npc-role', '消耗品', '聚气散', 2, 'uncommon', [
        'mana',
      ]),
      buildInventoryItem('npc-role', '随身物', '商人令牌', 1, 'rare', [
        'relic',
      ]),
      buildInventoryItem('npc-role', '材料', '优质矿石', 4, 'uncommon', [
        'material',
      ]),
    ]);
  }

  if (/渡|舟/u.test(source)) {
    return sortInventoryItems([
      buildInventoryItem('npc-role', '材料', '渡水船符', 1, 'rare', [
        'material',
      ]),
      buildInventoryItem('npc-role', '随身物', '渡河图卷', 1, 'epic', [
        'relic',
      ]),
      buildInventoryItem('npc-role', '消耗品', '回气丹', 2, 'uncommon', [
        'healing',
        'mana',
      ]),
    ]);
  }

  if (/猎/u.test(source)) {
    return sortInventoryItems([
      buildInventoryItem('npc-role', '材料', '兽皮', 3, 'uncommon', [
        'material',
      ]),
      buildInventoryItem('npc-role', '消耗品', '丹药盒', 2, 'uncommon', [
        'healing',
      ]),
      buildInventoryItem('npc-role', '随身物', '狩猎指南', 1, 'rare', [
        'relic',
      ]),
    ]);
  }

  if (/书|学|碑|墓/u.test(source)) {
    return sortInventoryItems([
      buildInventoryItem('npc-role', '随身物', '拓本残卷', 1, 'rare', [
        'relic',
      ]),
      buildInventoryItem('npc-role', '材料', '古地图', 1, 'uncommon', [
        'material',
      ]),
      buildInventoryItem('npc-role', '消耗品', '静心符', 2, 'uncommon', [
        'mana',
      ]),
    ]);
  }

  if (/守|卫|弟子/u.test(source)) {
    return sortInventoryItems([
      buildInventoryItem('npc-role', '武器', '制式腰刀', 1, 'rare', ['weapon']),
      buildInventoryItem('npc-role', '防具', '护腕', 1, 'uncommon', ['armor']),
      buildInventoryItem('npc-role', '消耗品', '止血散', 2, 'uncommon', [
        'healing',
      ]),
    ]);
  }

  return sortInventoryItems([
    buildInventoryItem('npc-role', '消耗品', '续命药盒', 2, 'uncommon', [
      'healing',
    ]),
    buildInventoryItem('npc-role', '材料', '普通矿石', 2, 'common', [
      'material',
    ]),
    buildInventoryItem('npc-role', '随身物', '随身杂物', 1, 'rare', ['relic']),
  ]);
}

function buildRecruitablePreferences(character: Character) {
  const values = character.attributeProfile?.values ?? {};
  const scores = [
    {
      tag: 'weapon',
      value: (values.axis_a ?? 0) + (values.axis_b ?? 0) + (values.axis_d ?? 0),
    },
    { tag: 'armor', value: (values.axis_a ?? 0) + (values.axis_f ?? 0) },
    { tag: 'mana', value: (values.axis_c ?? 0) + (values.axis_f ?? 0) },
    { tag: 'relic', value: (values.axis_c ?? 0) + (values.axis_e ?? 0) },
  ]
    .sort((a, b) => b.value - a.value)
    .slice(0, 2)
    .map((item) => item.tag);

  return [...new Set(scores)];
}

function getNpcPreferenceTags(encounter: Encounter) {
  const recruitCharacter = resolveEncounterRecruitCharacter(encounter);
  if (recruitCharacter) return buildRecruitablePreferences(recruitCharacter);

  const source = getRoleSource(encounter);

  if (/摊主|商|军需/u.test(source)) return ['relic', 'material', 'mana'];
  if (/渡|舟/u.test(source)) return ['relic', 'material'];
  if (/猎/u.test(source)) return ['healing', 'material', 'weapon'];
  if (/书|学|碑|墓/u.test(source)) return ['relic', 'mana', 'material'];
  if (/守|卫|弟子/u.test(source)) return ['weapon', 'armor', 'relic'];

  return ['relic', 'healing'];
}

function resolveNpcInsightWorldType(
  worldType: WorldType | null,
  encounter: Encounter,
) {
  if (worldType) return worldType;
  if (getRuntimeCustomWorldProfile()) return WorldType.CUSTOM;
  if (encounter.attributeProfile?.schemaId?.includes('xianxia'))
    return WorldType.XIANXIA;
  return WorldType.WUXIA;
}

function _canTradeWithNpc(encounter: Encounter) {
  return (
    encounter.characterId !== undefined ||
    /摊主|商|军需|渡|猎|书|学|守|卫/u.test(getRoleSource(encounter))
  );
}

function _canOfferHelp(encounter: Encounter) {
  return (
    /摊主|商|军需|渡|猎|书|学|守|卫|弟子/u.test(getRoleSource(encounter)) ||
    Boolean(encounter.characterId)
  );
}

function _canRecruitNpc(encounter: Encounter) {
  return Boolean(
    encounter.characterId && getCharacterById(encounter.characterId),
  );
}

function canTradeWithAnyNpc(_encounter: Encounter) {
  return true;
}

function canOfferHelpToAnyNpc(_encounter: Encounter) {
  return true;
}

function canRecruitAnyNpc(encounter: Encounter) {
  return Boolean(resolveEncounterRecruitCharacter(encounter));
}

export function getNpcDisclosureStage(
  affinity: number,
  options: { recruited?: boolean } = {},
): NpcDisclosureStage {
  if (options.recruited || affinity >= 50) return 'deep';
  if (affinity >= 30) return 'honest';
  if (affinity >= 15) return 'partial';
  return 'guarded';
}

export function getNpcWarmthStage(
  affinity: number,
  options: { recruited?: boolean } = {},
): NpcWarmthStage {
  if (options.recruited || affinity >= 50) return 'warm';
  if (affinity >= 30) return 'cooperative';
  if (affinity >= 15) return 'neutral';
  return 'distant';
}

export function getNpcAnswerMode(stage: NpcDisclosureStage): NpcAnswerMode {
  switch (stage) {
    case 'deep':
      return 'candid';
    case 'honest':
      return 'true_but_incomplete';
    case 'partial':
      return 'half_truth';
    default:
      return 'situational_only';
  }
}

export function describeDisclosureStage(stage: NpcDisclosureStage) {
  switch (stage) {
    case 'deep':
      return '已经愿意逐步谈到真实来历、真正目标与旧事恩怨。';
    case 'honest':
      return '开始认真回答，会说真话，但仍会保留最深的一层。';
    case 'partial':
      return '会松口一点，给出半真半假的说明。';
    default:
      return '只谈眼前局势、态度和试探，不会主动交底。';
  }
}

export function describeWarmthStage(stage: NpcWarmthStage) {
  switch (stage) {
    case 'warm':
      return '语气明显更友善亲切，也更照顾你的感受。';
    case 'cooperative':
      return '语气愿意配合，会把话说得更实在。';
    case 'neutral':
      return '语气恢复正常交流，但仍保留分寸。';
    default:
      return '语气偏冷，仍在观察你值不值得信。';
  }
}

export function describeConversationStyle(style: CharacterConversationStyle) {
  const guardText =
    style.guardStyle === 'blunt'
      ? '守口风格：直硬，不喜欢绕弯'
      : style.guardStyle === 'wary'
        ? '守口风格：谨慎，先看局势再开口'
        : style.guardStyle === 'evasive'
          ? '守口风格：会回避锋芒，拿别的话挡一下'
          : '守口风格：克制，有分寸地往外放信息';
  const warmText =
    style.warmStyle === 'dry'
      ? '亲和风格：冷淡'
      : style.warmStyle === 'gentle'
        ? '亲和风格：温和'
        : style.warmStyle === 'teasing'
          ? '亲和风格：带点松弛感和轻微调侃'
          : '亲和风格：平稳';
  const truthText =
    style.truthStyle === 'direct'
      ? '讲真话方式：一旦说，就会直给'
      : style.truthStyle === 'deflecting'
        ? '讲真话方式：先绕一下再说'
        : '讲真话方式：会一段一段碎片式透露';
  return [guardText, warmText, truthText].join('；');
}

export function getNpcConversationDirective(
  encounter: Encounter,
  npcState: NpcPersistentState,
) {
  const style = getEncounterConversationStyle(encounter);
  const disclosureStage = getNpcDisclosureStage(npcState.affinity, {
    recruited: npcState.recruited,
  });
  const warmthStage = getNpcWarmthStage(npcState.affinity, {
    recruited: npcState.recruited,
  });
  const answerMode = getNpcAnswerMode(disclosureStage);
  const allowTopics =
    disclosureStage === 'guarded'
      ? ['眼前危险', '现场判断', '对玩家的态度', '模糊钩子']
      : disclosureStage === 'partial'
        ? ['眼前危险', '表层理由', '试探性解释', '有限背景']
        : disclosureStage === 'honest'
          ? ['真实动机的轮廓', '旧事碎片', '真正目标的一部分']
          : ['真实来历', '真正目标', '旧事恩怨', '未说完的核心问题'];
  const blockedTopics =
    disclosureStage === 'guarded'
      ? ['完整来历', '真正目标', '旧事全貌']
      : disclosureStage === 'partial'
        ? ['完整来历', '旧事全貌']
        : disclosureStage === 'honest'
          ? ['把全部底牌一次说完']
          : [];
  return {
    affinity: npcState.affinity,
    disclosureStage,
    warmthStage,
    answerMode,
    style,
    allowTopics,
    blockedTopics,
  };
}

export function normalizeNpcPersistentState(
  npcState: NpcPersistentState,
): NpcPersistentState {
  return {
    ...npcState,
    relationState: buildRelationState(npcState.affinity),
    revealedFacts: Array.isArray(npcState.revealedFacts)
      ? npcState.revealedFacts.filter((fact): fact is string => typeof fact === 'string')
      : [],
    knownAttributeRumors: Array.isArray(npcState.knownAttributeRumors)
      ? npcState.knownAttributeRumors.filter((fact): fact is string => typeof fact === 'string')
      : [],
    tradeStockSignature: npcState.tradeStockSignature ?? null,
    firstMeaningfulContactResolved: npcState.firstMeaningfulContactResolved ?? false,
    seenBackstoryChapterIds: Array.isArray(npcState.seenBackstoryChapterIds)
      ? npcState.seenBackstoryChapterIds.filter((fact): fact is string => typeof fact === 'string')
      : [],
  };
}

export function syncNpcTradeInventory(
  state: GameState,
  encounter: Encounter,
  npcState: NpcPersistentState,
) {
  if (getRuntimeCustomWorldProfile() || !isRuntimeTradeDrivenRoleNpc(encounter)) {
    return npcState;
  }

  const tradeStockSignature = buildNpcTradeStockSignature(state, encounter);
  if (npcState.tradeStockSignature === tradeStockSignature) {
    return npcState;
  }

  const runtimeContext = buildRuntimeItemGenerationContext({
    state,
    generationChannel: 'npc_trade',
    encounter,
  });
  const runtimeStock = buildRuntimeTradeStock(encounter, runtimeContext);

  if (runtimeStock.length <= 0) {
    return normalizeNpcPersistentState({
      ...npcState,
      tradeStockSignature,
    });
  }

  const preservedInventory = npcState.tradeStockSignature
    ? npcState.inventory.filter(
        (item) => item.runtimeMetadata?.generationChannel !== 'npc_trade',
      )
    : [];

  return normalizeNpcPersistentState({
    ...npcState,
    inventory: sortInventoryItems([...preservedInventory, ...runtimeStock]),
    tradeStockSignature,
  });
}

export function isNpcFirstMeaningfulContact(
  encounter: Encounter,
  npcState: NpcPersistentState,
) {
  return Boolean(
    encounter.characterId
    && !npcState.recruited
    && npcState.firstMeaningfulContactResolved !== true,
  );
}

export function markNpcFirstMeaningfulContactResolved(
  npcState: NpcPersistentState,
) {
  return normalizeNpcPersistentState({
    ...npcState,
    firstMeaningfulContactResolved: true,
  });
}

function getFirstContactRelationStance(npcState: NpcPersistentState) {
  return npcState.relationState?.stance ?? buildRelationState(npcState.affinity).stance;
}

export function getNpcFirstContactTopics(
  encounter: Encounter,
  npcState: NpcPersistentState,
) {
  const stance = getFirstContactRelationStance(npcState);

  switch (stance) {
    case 'cooperative':
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '先问问你刚才为什么会主动提醒我',
          detailText: '确认你主动靠近的理由',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '问问你对眼前局势已经看出了什么',
          detailText: '先交换第一判断',
        },
      ];
    case 'bonded':
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '先确认你为什么会在这一步亲自现身',
          detailText: '确认这次正面对接的来意',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '问问你现在最想先和我处理哪件事',
          detailText: '先对齐眼前优先级',
        },
      ];
    case 'neutral':
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '先问问你为什么会出现在这里',
          detailText: '先摸清来意',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '试着确认你刚才那句提醒到底是什么意思',
          detailText: '探探你对局势的判断',
        },
      ];
    default:
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: `先问问${encounter.npcName}刚才为什么一直在观察你`,
          detailText: '从彼此试探切入',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '问问前面到底有什么不对劲',
          detailText: '先谈眼前动静',
        },
      ];
  }
}

function buildNpcFirstContactStoryText(
  encounter: Encounter,
  npcState: NpcPersistentState,
  sceneName?: string | null,
) {
  const stance = getFirstContactRelationStance(npcState);
  const sceneText = sceneName ?? '当前地界';

  switch (stance) {
    case 'cooperative':
      return `${sceneText}里，你第一次真正和${encounter.npcName}正面对上。对方对你并不生分，但仍把分寸拿得很稳，像是在等你先把话说开。`;
    case 'bonded':
      return `${sceneText}里，你第一次真正和${encounter.npcName}把话对上。你们之间已有相当信任，但此刻仍像一次需要重新校准节奏的正式会面。`;
    case 'neutral':
      return `${sceneText}里，你第一次真正和${encounter.npcName}打了照面。对方没有立刻疏远你，却仍在观察你会先怎么开口。`;
    default:
      return `${sceneText}里，你第一次真正和${encounter.npcName}对上视线。对方明显在打量你，像是在判断你值不值得回应。`;
  }
}

function getNpcChatTopics(encounter: Encounter, npcState?: NpcPersistentState) {
  const source = getRoleSource(encounter);
  const directive = npcState
    ? getNpcConversationDirective(encounter, npcState)
    : null;
  const stage = directive?.disclosureStage ?? 'guarded';

  if (npcState && isNpcFirstMeaningfulContact(encounter, npcState)) {
    return getNpcFirstContactTopics(encounter, npcState);
  }

  if (encounter.characterId) {
    if (stage === 'guarded') {
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '先问问你刚才在留意什么',
          detailText: '从眼前动静切入',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '试探你为什么提醒我别硬闯',
          detailText: '探探你的态度和判断',
        },
      ];
    }
    if (stage === 'partial') {
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '问问你为什么还留在这里没走',
          detailText: '追一点表层理由',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '探探你是不是早知道前面会出事',
          detailText: '试着撬开半句真话',
        },
      ];
    }
    if (stage === 'honest') {
      return [
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '问问你和前面的麻烦到底有什么牵连',
          detailText: '追动机和旧事轮廓',
        },
        {
          functionId: NPC_CHAT_FUNCTION.id,
          actionText: '聊聊你现在最想先解决的事',
          detailText: '开始碰真正目标',
        },
      ];
    }
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '让你把这一路没说完的事讲清楚',
        detailText: '追问真实来历和目标',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '问问你真正想把这条路走到哪里',
        detailText: '追问最终目标',
      },
    ];
  }

  if (/摊主|商|军需/u.test(source)) {
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '问问这条路上最近的行情',
        detailText: '打听最近行情',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '旁敲侧击最近见过哪些可疑人物',
        detailText: '打听可疑来客',
      },
    ];
  }

  if (/渡|舟/u.test(source)) {
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '打听最近经过渡口的人',
        detailText: '问问往来人影',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '聊聊这条水路最近安不安稳',
        detailText: '问问水路动静',
      },
    ];
  }

  if (/猎/u.test(source)) {
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '询问附近的兽踪和异动',
        detailText: '摸清周围异动',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '问问这片地界有没有稳妥的走法',
        detailText: '问问稳妥走法',
      },
    ];
  }

  if (/书|学|碑|墓/u.test(source)) {
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '聊聊这片地界的旧事',
        detailText: '打听旧闻背景',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '问问这里最近有没有反常的征兆',
        detailText: '问问异常征兆',
      },
    ];
  }

  if (/守|卫|弟子/u.test(source)) {
    return [
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '打听这附近的规矩和动向',
        detailText: '摸清规矩风声',
      },
      {
        functionId: NPC_CHAT_FUNCTION.id,
        actionText: '试探最近有没有人在暗中盯着这里',
        detailText: '试探暗中埋伏',
      },
    ];
  }

  return [
    {
      functionId: NPC_CHAT_FUNCTION.id,
      actionText: '随口聊聊眼前的局势',
      detailText: '试探眼前局势',
    },
    {
      functionId: NPC_CHAT_FUNCTION.id,
      actionText: '问问前面这条路值不值得继续走',
      detailText: '问问前路风险',
    },
  ];
}

function resolveNpcHelpRewardConfig(encounter: Encounter) {
  const source = getRoleSource(encounter);

  if (/摊主|商|军需/u.test(source)) {
    return {
      baseMana: 14,
      fixedKinds: ['consumable'] as const,
      fixedPermanence: ['timed'] as const,
      itemCount: 1,
      cooldownBonus: 0,
    };
  }

  if (/渡|舟/u.test(source)) {
    return {
      baseMana: 18,
      cooldownBonus: 1,
      fixedKinds: ['consumable', 'relic'] as const,
      fixedPermanence: ['timed', 'permanent'] as const,
      itemCount: 1,
    };
  }

  if (/猎|守|卫|弟子/u.test(source)) {
    return {
      baseHp: 28,
      cooldownBonus: 1,
      fixedKinds: ['consumable', 'equipment'] as const,
      fixedPermanence: ['timed', 'permanent'] as const,
      itemCount: 1,
    };
  }

  if (/书|学|碑|墓/u.test(source)) {
    return {
      baseMana: 20,
      fixedKinds: ['relic'] as const,
      fixedPermanence: ['permanent'] as const,
      itemCount: 1,
      cooldownBonus: 0,
    };
  }

  return {
    baseHp: 18,
    baseMana: 10,
    fixedKinds: ['consumable'] as const,
    fixedPermanence: ['timed'] as const,
    itemCount: 1,
    cooldownBonus: 0,
  };
}

function buildNpcHelpRewardFromDirectedReward(
  directedReward: ReturnType<typeof buildDirectedRuntimeReward>,
  cooldownBonus = 0,
): NpcHelpReward {
  return {
    hp: directedReward.hp,
    mana: directedReward.mana,
    cooldownBonus,
    items: flattenDirectedRuntimeRewardItems(directedReward),
    storyHint: directedReward.storyHint,
  };
}

export function buildNpcHelpReward(
  encounter: Encounter,
  state?: GameState | null,
): NpcHelpReward {
  const rewardConfig = resolveNpcHelpRewardConfig(encounter);
  const runtimeContext = state
    ? buildRuntimeItemGenerationContext({
        state,
        generationChannel: 'npc_reward',
        encounter,
      })
    : buildLooseRuntimeItemGenerationContext({
        worldType: resolveNpcInsightWorldType(null, encounter),
        encounter,
        generationChannel: 'npc_reward',
        playerCharacterId: 'npc-help-preview',
        playerBuildTags: getNpcPreferenceTags(encounter),
      });
  const directedReward = buildDirectedRuntimeReward(runtimeContext, {
    seedKey: `npc-help:${encounter.id ?? encounter.npcName}:${runtimeContext.sceneId ?? 'scene'}`,
    itemCount: rewardConfig.itemCount,
    fixedKinds: [...rewardConfig.fixedKinds],
    fixedPermanence: [...rewardConfig.fixedPermanence],
    baseHp: rewardConfig.baseHp,
    baseMana: rewardConfig.baseMana,
  });

  return buildNpcHelpRewardFromDirectedReward(
    directedReward,
    rewardConfig.cooldownBonus,
  );
}

export async function generateNpcHelpReward(
  encounter: Encounter,
  state: GameState,
): Promise<NpcHelpReward> {
  const rewardConfig = resolveNpcHelpRewardConfig(encounter);
  const runtimeContext = buildRuntimeItemGenerationContext({
    state,
    generationChannel: 'npc_reward',
    encounter,
  });
  const directedReward = await generateDirectedRuntimeReward(runtimeContext, {
    seedKey: `npc-help:${encounter.id ?? encounter.npcName}:${runtimeContext.sceneId ?? 'scene'}`,
    itemCount: rewardConfig.itemCount,
    fixedKinds: [...rewardConfig.fixedKinds],
    fixedPermanence: [...rewardConfig.fixedPermanence],
    baseHp: rewardConfig.baseHp,
    baseMana: rewardConfig.baseMana,
  });

  return buildNpcHelpRewardFromDirectedReward(
    directedReward,
    rewardConfig.cooldownBonus,
  );
}

export function describeHelpReward(reward: NpcHelpReward) {
  const parts: string[] = [];

  if ((reward.hp ?? 0) > 0) parts.push(`回血 ${reward.hp}`);
  if ((reward.mana ?? 0) > 0) parts.push(`回蓝 ${reward.mana}`);
  if ((reward.cooldownBonus ?? 0) > 0)
    parts.push(`冷却 -${reward.cooldownBonus}`);
  if (reward.items.length > 0)
    parts.push(`获得 ${reward.items.map((item) => item.name).join('、')}`);

  return parts.join('、') || '获得一些支援';
}

function getNpcActionText(encounter: Encounter) {
  return encounter.characterId
    ? `${encounter.npcName}看上去对你保持着戒备，也在观察你的反应。`
    : `${encounter.npcName}停在你面前，像是在等你先开口。`;
}

function buildNpcOption(
  functionId: string,
  actionText: string,
  detailText: string,
  npcId: string,
  action: NpcInteractionAction,
  questId?: string,
) {
  const resolvedDetailText =
    functionId === NPC_CHAT_FUNCTION.id ? '' : detailText;

  return {
    functionId,
    actionText,
    detailText: resolvedDetailText,
    priority: getStoryOptionPriority(functionId),
    visuals: IDLE_VISUALS,
    interaction: {
      kind: 'npc',
      npcId,
      action,
      questId,
    },
  } as StoryOption;
}

function getPlayerBenefitScore(item: InventoryItem, character: Character) {
  let score = getInventoryItemValue(item);
  const customWorldProfile = getRuntimeCustomWorldProfile();
  const schema = resolveAttributeSchema(
    customWorldProfile ? WorldType.CUSTOM : WorldType.WUXIA,
    customWorldProfile,
  );

  if (item.tags.includes('healing')) score += 8;
  if (
    item.tags.includes('mana') &&
    character.attributes.intelligence + character.attributes.spirit >= 12
  )
    score += 6;
  if (item.tags.includes('weapon')) score += 5;
  if (item.tags.includes('armor')) score += 4;
  if (item.tags.includes('relic')) score += 5;
  if (item.attributeResonance) {
    score += Math.round(
      scoreAttributeFit(
        character.attributeProfile,
        item.attributeResonance.resonanceVector,
        schema,
      ) * 20,
    );
  }

  return score;
}

function pickTopItems(
  items: InventoryItem[],
  score: (item: InventoryItem) => number,
  limit = 2,
) {
  return [...items]
    .filter((item) => item.quantity > 0)
    .sort((a, b) => {
      const diff = score(b) - score(a);
      if (diff !== 0) return diff;
      return b.quantity - a.quantity;
    })
    .slice(0, limit);
}

export function summarizeInventoryItems(items: InventoryItem[], limit = 2) {
  const names = items
    .filter((item) => item.quantity > 0)
    .slice(0, limit)
    .map((item) => item.name);

  return names.length > 0 ? names.join('、') : '暂无值得一提的物品';
}

export function getRarityScore(rarity: ItemRarity) {
  return RARITY_SCORES[rarity];
}

export function getRarityLabel(rarity: ItemRarity) {
  return RARITY_LABELS[rarity];
}

export function sortInventoryItems(items: InventoryItem[]) {
  return [...items].sort((a, b) => {
    const rarityDiff = getRarityScore(b.rarity) - getRarityScore(a.rarity);
    if (rarityDiff !== 0) return rarityDiff;
    const categoryDiff = a.category.localeCompare(b.category, 'zh-Hans-CN');
    if (categoryDiff !== 0) return categoryDiff;
    return a.name.localeCompare(b.name, 'zh-Hans-CN');
  });
}

export function addInventoryItems(
  base: InventoryItem[],
  additions: InventoryItem[],
) {
  return sortInventoryItems(mergeInventory([...base, ...additions]));
}

export function removeInventoryItem(
  base: InventoryItem[],
  itemId: string,
  quantity = 1,
) {
  return sortInventoryItems(
    base
      .map((item) =>
        item.id === itemId
          ? {
              ...item,
              quantity: Math.max(0, item.quantity - quantity),
            }
          : item,
      )
      .filter((item) => item.quantity > 0),
  );
}

export function buildInitialPlayerInventory(
  character: Character,
  worldType: WorldType | null,
) {
  return buildCharacterInventory(character, worldType);
}

function buildMonsterPresetInventory(
  encounter: Encounter,
  worldType: WorldType | null,
) {
  if (!worldType || !encounter.monsterPresetId)
    return buildRoleInventory(encounter);

  const preset = getMonsterPresetById(worldType, encounter.monsterPresetId);
  if (!preset) return buildRoleInventory(encounter);

  return sortInventoryItems(
    preset.lootTable.map((entry) => ({
      ...entry.item,
      quantity: Math.max(1, entry.item.quantity),
    })),
  );
}

function getMonsterPresetForEncounter(encounter: Encounter) {
  if (!encounter.monsterPresetId) return null;

  return (
    getMonsterPresetById(WorldType.WUXIA, encounter.monsterPresetId) ??
    getMonsterPresetById(WorldType.XIANXIA, encounter.monsterPresetId) ??
    getMonsterPresetById(WorldType.CUSTOM, encounter.monsterPresetId)
  );
}

export function buildInitialNpcState(
  encounter: Encounter,
  worldType: WorldType | null,
  state?: GameState | null,
): NpcPersistentState {
  const initialAffinity =
    encounter.initialAffinity ??
    (encounter.monsterPresetId ? -40 : encounter.characterId ? 18 : 6);
  const inventory = encounter.characterId
    ? (() => {
        const character = getCharacterById(encounter.characterId);
        return character
          ? buildCharacterNpcInventory(character, worldType)
          : buildRoleInventory(encounter, worldType, state);
      })()
    : encounter.monsterPresetId
      ? buildMonsterPresetInventory(encounter, worldType)
      : buildRoleInventory(encounter, worldType, state);
  const attributeRumors = buildEncounterAttributeRumors(encounter, {
    worldType: resolveNpcInsightWorldType(worldType, encounter),
    customWorldProfile: getRuntimeCustomWorldProfile(),
  });

  return normalizeNpcPersistentState({
    affinity: initialAffinity,
    relationState: buildRelationState(initialAffinity),
    helpUsed: false,
    chattedCount: 0,
    giftsGiven: 0,
    inventory,
    tradeStockSignature:
      state && isRuntimeTradeDrivenRoleNpc(encounter) && !getRuntimeCustomWorldProfile()
        ? buildNpcTradeStockSignature(state, encounter)
        : null,
    recruited: false,
    revealedFacts: [],
    knownAttributeRumors: attributeRumors,
    firstMeaningfulContactResolved: false,
    seenBackstoryChapterIds: [],
  });
}

export function getNpcDiscountTier(affinity: number) {
  return getDiscountTierForAffinity(affinity);
}

export function getNpcDiscountText(affinity: number) {
  const tier = getNpcDiscountTier(affinity);
  if (tier <= 0) return '当前暂无折扣，需要按原价交换或购买。';
  return `当前折扣：商品价格降低 ${tier * 8}% 。`;
}

export function getNpcProgressText(encounter: Encounter, affinity: number) {
  const parts = ['好感 30/60/90 可继续解锁更高折扣'];
  if (canRecruitAnyNpc(encounter)) {
    parts.push(`好感达到 ${NPC_RECRUIT_AFFINITY} 可招募入队`);
  }
  parts.push(`当前好感 ${affinity}`);
  return parts.join('，');
}

export function describeNpcAffinityInWords(
  encounter: Encounter,
  affinity: number,
  options: {
    recruited?: boolean;
  } = {},
) {
  if (options.recruited) {
    return '已经把你视为并肩而行的同伴，交流时天然站在你这一边。';
  }

  if (affinity >= 90) {
    return canRecruitAnyNpc(encounter)
      ? '对你高度信赖，言谈间明显亲近，几乎已经把你当成自己人。'
      : '对你高度信赖，态度亲近，也愿意主动照应你的处境。';
  }

  if (affinity >= 50) {
    return canRecruitAnyNpc(encounter)
      ? '已经真正信任你，愿意认真考虑与你同行。'
      : '已经真正信任你，交流坦率，也愿意提供实在帮助。';
  }

  if (affinity >= 30) {
    return '态度已经友善了许多，愿意配合你，也会给出更真诚的回应。';
  }

  if (affinity >= 15) {
    return '戒备正在松动，愿意正常交谈，并试探性地和你合作。';
  }

  if (affinity > 0) {
    return '仍带着明显戒心，只在礼貌范围内回应你。';
  }

  return '关系已经降到冰点，对你几乎不再保留善意。';
}

function describeAffinityShift(affinityGain: number) {
  if (affinityGain >= 12) return '态度一下子软化了许多';
  if (affinityGain >= 8) return '态度明显和缓下来';
  if (affinityGain >= 5) return '态度比先前亲近了一些';
  return '态度略微放松了些';
}

export function getChatAffinityGain(npcState: NpcPersistentState) {
  return Math.max(4, 8 - npcState.chattedCount);
}

export function getChatAffinityOutcome(params: {
  playerCharacter: Character;
  encounter: Encounter;
  npcState: NpcPersistentState;
  actionText: string;
  worldType?: WorldType | null;
  customWorldProfile?: ReturnType<typeof getRuntimeCustomWorldProfile> | null;
}) {
  return buildChatAffinityOutcome({
    playerCharacter: params.playerCharacter,
    encounter: params.encounter,
    npcState: params.npcState,
    actionText: params.actionText,
    worldType: resolveNpcInsightWorldType(
      params.worldType ?? null,
      params.encounter,
    ),
    customWorldProfile:
      params.customWorldProfile ?? getRuntimeCustomWorldProfile(),
  });
}

function buildGiftCandidate(
  item: InventoryItem,
  encounter: Encounter,
  options: {
    worldType?: WorldType | null;
    customWorldProfile?: ReturnType<typeof getRuntimeCustomWorldProfile> | null;
  } = {},
): GiftCandidate {
  const base = 4 + getRarityScore(item.rarity) * 3;
  const preferenceTags = getNpcPreferenceTags(encounter);
  const preferenceBonus = item.tags.some((tag) => preferenceTags.includes(tag))
    ? 5
    : 0;
  const specialBonus = item.category.includes('专属') ? 4 : 0;
  const insight = buildGiftAffinityInsight(item, encounter, {
    worldType: resolveNpcInsightWorldType(options.worldType ?? null, encounter),
    customWorldProfile:
      options.customWorldProfile ?? getRuntimeCustomWorldProfile(),
  });
  const resonanceBonus = insight.resonanceBonus ?? 0;

  return {
    item,
    affinityGain: Math.min(
      24,
      base + preferenceBonus + specialBonus + resonanceBonus,
    ),
    attributeInsight: insight,
  };
}

export function calculateGiftAffinityGain(
  item: InventoryItem,
  encounter: Encounter,
) {
  return buildGiftCandidate(item, encounter).affinityGain;
}

export function getGiftCandidates(
  playerInventory: InventoryItem[],
  encounter: Encounter,
  options: {
    worldType?: WorldType | null;
    customWorldProfile?: ReturnType<typeof getRuntimeCustomWorldProfile> | null;
  } = {},
) {
  return [...playerInventory]
    .filter((item) => item.quantity > 0)
    .map((item) => buildGiftCandidate(item, encounter, options))
    .sort((a, b) => {
      const diff = b.affinityGain - a.affinityGain;
      if (diff !== 0) return diff;
      return getRarityScore(b.item.rarity) - getRarityScore(a.item.rarity);
    });
}

export function getPreferredGiftItemId(
  playerInventory: InventoryItem[],
  encounter: Encounter,
  options: {
    worldType?: WorldType | null;
    customWorldProfile?: ReturnType<typeof getRuntimeCustomWorldProfile> | null;
  } = {},
) {
  return (
    getGiftCandidates(playerInventory, encounter, options)[0]?.item.id ?? null
  );
}

export function buildGiftCandidateSummary(
  giftCandidates: GiftCandidate[],
  limit = 3,
) {
  const preview = giftCandidates
    .slice(0, limit)
    .map((candidate) => `${candidate.item.name}（好感 +${candidate.affinityGain}）`);

  if (preview.length === 0) {
    return '暂无合适礼物';
  }

  return preview.join('、');
}

export function checkTradeItem(
  playerItem: InventoryItem | null,
  npcItem: InventoryItem,
  affinity: number,
  playerCurrency = 0,
): TradeCheckResult {
  const offeredValue = playerItem ? getInventoryItemValue(playerItem) : 0;
  const discountTier = getNpcDiscountTier(affinity);
  const purchasePrice = getNpcPurchasePrice(npcItem, affinity);
  const canBarter = Boolean(playerItem && offeredValue >= purchasePrice);
  const canPurchase = playerCurrency >= purchasePrice;
  return {
    canBarter,
    canPurchase,
    canAcquire: canBarter || canPurchase,
    offeredValue,
    requiredValue: purchasePrice,
    purchasePrice,
    discountTier,
    currencyShortfall: Math.max(0, purchasePrice - playerCurrency),
  };
}

export function getNpcSparMaxHp(character: Character | null) {
  if (!character) return 8;
  const values = character.attributeProfile?.values ?? {};
  const sparScore =
    ((values.axis_a ?? 0) + (values.axis_b ?? 0) + (values.axis_f ?? 0)) / 10;
  return Math.max(7, Math.min(12, Math.round(sparScore / 3)));
}

export function createNpcBattleMonster(
  encounter: Encounter,
  npcState: NpcPersistentState,
  mode: NpcBattleMode = 'fight',
) {
  const monsterPreset = getMonsterPresetForEncounter(encounter);
  const recruitCharacter = resolveEncounterRecruitCharacter(encounter);
  if (monsterPreset) {
    const hostileMaxHp =
      mode === 'spar'
        ? Math.max(
            8,
            Math.min(14, Math.round(monsterPreset.baseStats.maxHp / 18)),
          )
        : monsterPreset.baseStats.maxHp;

    return {
      id: monsterPreset.id,
      name: encounter.npcName,
      action:
        mode === 'spar'
          ? '敌对/切磋前蓄力，点击后转为原地闪避'
          : monsterPreset.introAction,
      description: encounter.npcDescription,
      animation: 'idle' as const,
      xMeters: 3.2,
      yOffset: 0,
      facing: 'left' as const,
      attackRange: monsterPreset.baseStats.attackRange,
      speed: monsterPreset.baseStats.speed,
      hp: hostileMaxHp,
      maxHp: hostileMaxHp,
      renderKind: 'npc' as const,
      combatTags: monsterPreset.combatTags,
      attributeProfile: monsterPreset.attributeProfile,
      behaviorVectors: monsterPreset.behaviorVectors,
      encounter: {
        ...encounter,
        hostile: true,
        xMeters: 3.2,
      },
    } satisfies SceneMonster;
  }

  const baseHp = recruitCharacter ? getCharacterMaxHp(recruitCharacter) : 120;
  const baseSpeed = recruitCharacter
    ? Math.max(
        6,
        Math.round(
          (recruitCharacter.attributeProfile?.values.axis_b ?? 48) / 12 + 1,
        ),
      )
    : 7;
  const maxHp =
    mode === 'spar'
      ? getNpcSparMaxHp(recruitCharacter)
      : Math.max(baseHp, 80 + npcState.affinity);

  if (mode === 'spar') {
    return {
      id: `npc-opponent-${encounter.id ?? encounter.npcName}`,
      name: encounter.npcName,
      action: '抱拳行礼，准备点到为止地切磋武艺',
      description: encounter.npcDescription,
      animation: 'idle' as const,
      xMeters: 3.2,
      yOffset: 0,
      facing: 'left' as const,
      attackRange: 1.8,
      speed: baseSpeed,
      hp: maxHp,
      maxHp,
      renderKind: 'npc' as const,
      encounter: {
        ...encounter,
        xMeters: 3.2,
      },
    } satisfies SceneMonster;
  }

  return {
    id: `npc-opponent-${encounter.id ?? encounter.npcName}`,
    name: encounter.npcName,
    action: '摆开架势，随时准备出手',
    description: encounter.npcDescription,
    animation: 'idle' as const,
    xMeters: 3.2,
    yOffset: 0,
    facing: 'left' as const,
    attackRange: 1.8,
    speed: baseSpeed,
    hp: Math.max(baseHp, 80 + npcState.affinity),
    maxHp: Math.max(baseHp, 80 + npcState.affinity),
    renderKind: 'npc' as const,
    encounter: {
      ...encounter,
      xMeters: 3.2,
    },
  } satisfies SceneMonster;
}

export function getNpcLootItems(
  npcState: NpcPersistentState,
  character: Character,
) {
  return pickTopItems(
    npcState.inventory,
    (item) => getPlayerBenefitScore(item, character),
    2,
  ).map((item) => ({
    ...item,
    quantity: 1,
  }));
}

export function buildNpcEncounterStoryMoment({
  state,
  encounter,
  npcState,
  playerCharacter,
  playerInventory,
  activeQuests,
  scene,
  worldType,
  partySize,
  overrideText,
}: {
  state?: GameState | null;
  encounter: Encounter;
  npcState: NpcPersistentState;
  playerCharacter: Character;
  playerInventory: InventoryItem[];
  activeQuests: QuestLogEntry[];
  scene: Pick<
    ScenePresetInfo,
    'id' | 'name' | 'monsterIds' | 'npcs' | 'treasureHints'
  > | null;
  worldType: WorldType | null;
  partySize: number;
  overrideText?: string;
}): StoryMoment {
  const npcId = encounter.id ?? encounter.npcName;
  const resolvedWorldType = resolveNpcInsightWorldType(worldType, encounter);
  const runtimeCustomWorldProfile = getRuntimeCustomWorldProfile();
  const lootHighlights = pickTopItems(
    npcState.inventory,
    (item) =>
      getPlayerBenefitScore(item, playerCharacter) +
      getRarityScore(item.rarity),
    2,
  );
  const giftCandidates = getGiftCandidates(playerInventory, encounter, {
    worldType: resolvedWorldType,
    customWorldProfile: runtimeCustomWorldProfile,
  });
  const helpReward = buildNpcHelpReward(encounter, state);
  const recruitable = canRecruitAnyNpc(encounter);
  const recruitInsight = recruitable
    ? buildRecruitmentInsight({
        encounter,
        npcState,
        playerCharacter,
        worldType: resolvedWorldType,
        customWorldProfile: runtimeCustomWorldProfile,
      })
    : null;
  const activeQuest = getQuestForIssuer(activeQuests, npcId);
  const generatedQuest = buildQuestForEncounter({
    issuerNpcId: npcId,
    issuerNpcName: encounter.npcName,
    roleText: encounter.context,
    scene,
    worldType,
  });
  const options: StoryOption[] = [];
  const isHostileEncounter =
    npcState.affinity < 0 ||
    Boolean(encounter.hostile) ||
    Boolean(encounter.monsterPresetId);

  if (isHostileEncounter) {
    options.push(
      buildNpcOption(
        NPC_FIGHT_FUNCTION.id,
        `迎战${encounter.npcName}`,
        '对方敌意已明确，靠近后就会直接进入战斗。',
        npcId,
        'fight',
      ),
    );

    return {
      text:
        overrideText ??
        `${scene?.name ?? '当前地界'}里，${encounter.npcName}已将你视为敌人。它一照面就摆出了进攻姿态，当前好感为 ${npcState.affinity}。`,
      options: sortStoryOptionsByPriority(options),
    };
  }

  if (canTradeWithAnyNpc(encounter) && npcState.inventory.length > 0) {
    options.push(
      buildNpcOption(
        NPC_TRADE_FUNCTION.id,
        NPC_TRADE_FUNCTION.title,
        '查看库存与价格',
        npcId,
        'trade',
      ),
    );
  }

  options.push(
    buildNpcOption(
      NPC_FIGHT_FUNCTION.id,
      NPC_FIGHT_FUNCTION.title,
      `以恶意掠夺为目的强行开战。好感度归 0，并可能掠夺${summarizeInventoryItems(lootHighlights)}。`,
      npcId,
      'fight',
    ),
  );

  options.push(
    buildNpcOption(
      NPC_SPAR_FUNCTION.id,
      NPC_SPAR_FUNCTION.title,
      '点到为止地过招。战斗中双方每次仅造成 1 点伤害，结束后小幅提升好感度。',
      npcId,
      'spar',
    ),
  );

  if (canOfferHelpToAnyNpc(encounter) && !npcState.helpUsed) {
    options.push(
      buildNpcOption(
        NPC_HELP_FUNCTION.id,
        NPC_HELP_FUNCTION.title,
        `可能获得${describeHelpReward(helpReward)}。每位角色仅限一次。`,
        npcId,
        'help',
      ),
    );
  }

  getNpcChatTopics(encounter, npcState).forEach((topic) => {
    options.push(
      buildNpcOption(
        topic.functionId,
        topic.actionText,
        topic.detailText,
        npcId,
        'chat',
      ),
    );
  });

  if (giftCandidates.length > 0) {
    options.push(
      buildNpcOption(
        NPC_GIFT_FUNCTION.id,
        NPC_GIFT_FUNCTION.title,
        `当前较适合送出的礼物有：${buildGiftCandidateSummary(giftCandidates)}。打开礼物面板后可查看详细好感收益。`,
        npcId,
        'gift',
      ),
    );
  }

  if (
    recruitable &&
    !npcState.recruited &&
    npcState.affinity >= NPC_RECRUIT_AFFINITY
  ) {
    options.push(
      buildNpcOption(
        NPC_RECRUIT_FUNCTION.id,
        NPC_RECRUIT_FUNCTION.title,
        partySize >= MAX_COMPANIONS
          ? '好感已达标，但当前队伍已满，需要先放生一名同伴。'
          : isNpcFirstMeaningfulContact(encounter, npcState)
            ? `关系已足够稳固，你可以正式邀请对方同行。${recruitInsight?.summary ?? ''}`
            : `好感已达标，对方愿意加入你的队伍。${recruitInsight?.summary ?? ''}`,
        npcId,
        'recruit',
      ),
    );
  }

  if (activeQuest?.status === 'completed') {
    options.push(
      buildNpcOption(
        NPC_QUEST_TURN_IN_FUNCTION.id,
        `向${encounter.npcName}交付委托`,
        buildQuestTurnInDetail(activeQuest),
        npcId,
        'quest_turn_in',
        activeQuest.id,
      ),
    );
  } else if (!activeQuest && generatedQuest) {
    options.push(
      buildNpcOption(
        NPC_QUEST_ACCEPT_FUNCTION.id,
        `接下${encounter.npcName}的委托`,
        buildQuestAcceptDetail(generatedQuest),
        npcId,
        'quest_accept',
        generatedQuest.id,
      ),
    );
  }

  options.push(
    buildNpcOption(
      NPC_LEAVE_FUNCTION.id,
      NPC_LEAVE_FUNCTION.title,
      '离开当前角色，重新回到探索状态。',
      npcId,
      'leave',
    ),
  );

  return {
    text:
      overrideText ??
      (
        isNpcFirstMeaningfulContact(encounter, npcState)
          ? `${buildNpcFirstContactStoryText(encounter, npcState, scene?.name)} ${describeNpcAffinityInWords(encounter, npcState.affinity)}`
          : `${scene?.name ?? '当前地界'}里，你遇见了${encounter.npcName}。${getNpcActionText(encounter)} ${describeNpcAffinityInWords(encounter, npcState.affinity)}`
      ),
    options: sortStoryOptionsByPriority(
      options,
    ),
  };
}

export function buildNpcChatResultText(
  encounter: Encounter,
  affinityGain: number,
  nextAffinity: number,
  attributeSummary?: string,
) {
  const recruitText =
    canRecruitAnyNpc(encounter) && nextAffinity >= NPC_RECRUIT_AFFINITY
      ? '看起来只要你正式开口邀请，对方多半不会再回避。'
      : '你们之间的气氛比刚见面时自然了不少。';
  const summaryText = attributeSummary ? `你注意到：${attributeSummary}` : '';
  return `${encounter.npcName}和你聊了几句，${describeAffinityShift(affinityGain)}。${describeNpcAffinityInWords(encounter, nextAffinity)}${summaryText}${recruitText}`;
}

export function buildNpcSparResultText(
  affinityGain: number,
  nextAffinity: number,
) {
  const sparEncounter = {
    npcName: '对方',
    npcDescription: '',
    npcAvatar: '',
    context: '',
  } satisfies Encounter;
  return `你们点到为止地切磋了一场，彼此都更认可对方的身手。${describeAffinityShift(affinityGain)}。${describeNpcAffinityInWords(sparEncounter, nextAffinity)}`;
}

export function buildNpcGiftResultText(
  encounter: Encounter,
  item: InventoryItem,
  affinityGain: number,
  nextAffinity: number,
  attributeSummary?: string,
) {
  const summaryText = attributeSummary ? `你感到：${attributeSummary}` : '';
  return `${encounter.npcName}收下了${item.name}，${describeAffinityShift(affinityGain)}。${describeNpcAffinityInWords(encounter, nextAffinity)}${summaryText}`;
}

export function buildNpcGiftCommitActionText(
  encounter: Encounter,
  item: InventoryItem,
) {
  return `把${item.name}赠给${encounter.npcName}`;
}

export function buildNpcTradeResultText(
  encounter: Encounter,
  gainedItem: InventoryItem,
  affinity: number,
  worldType: WorldType | null,
  paidItem?: InventoryItem | null,
  paidCurrency?: number,
) {
  if (paidItem) {
    return `${encounter.npcName}收下了${paidItem.name}，把${gainedItem.name}交给了你。${getNpcDiscountText(affinity)}`;
  }

  return `${encounter.npcName}收下了${formatCurrency(paidCurrency ?? getNpcPurchasePrice(gainedItem, affinity), worldType)}，把${gainedItem.name}卖给了你。${getNpcDiscountText(affinity)}`;
}

export function buildNpcTradeTransactionResultText({
  encounter,
  mode,
  item,
  quantity,
  totalPrice,
  worldType,
}: {
  encounter: Encounter;
  mode: 'buy' | 'sell';
  item: InventoryItem;
  quantity: number;
  totalPrice: number;
  worldType: WorldType | null;
}) {
  const quantityText = quantity > 1 ? `${item.name} x${quantity}` : item.name;

  if (mode === 'sell') {
    return `${encounter.npcName}收下了${quantityText}，付给你${formatCurrency(totalPrice, worldType)}。`;
  }

  return `${encounter.npcName}收下了${formatCurrency(totalPrice, worldType)}，把${quantityText}卖给了你。`;
}

export function buildNpcTradeTransactionActionText({
  encounter,
  mode,
  item,
  quantity,
}: {
  encounter: Encounter;
  mode: 'buy' | 'sell';
  item: InventoryItem;
  quantity: number;
}) {
  const quantityText = quantity > 1 ? `${item.name} x${quantity}` : item.name;

  if (mode === 'sell') {
    return `把${quantityText}卖给${encounter.npcName}`;
  }

  return `从${encounter.npcName}手里买下${quantityText}`;
}

export function buildNpcHelpResultText(
  encounter: Encounter,
  reward: NpcHelpReward,
) {
  const storyHintText = reward.storyHint ? ` ${reward.storyHint}` : '';
  return `${encounter.npcName}向你伸出了援手。你获得了${describeHelpReward(reward)}。${storyHintText}`;
}

export function buildNpcRecruitResultText(
  encounter: Encounter,
  releasedCompanionName?: string | null,
) {
  const releaseText = releasedCompanionName
    ? `你把${releasedCompanionName}放回了世界中，让出了队伍位置。`
    : '';
  return `${encounter.npcName}点头答应，正式加入了你的队伍。${releaseText}`;
}

export function buildNpcLeaveResultText(encounter: Encounter) {
  return `你暂时没有继续和${encounter.npcName}纠缠，转身把注意力重新放回前路。`;
}