import type {
  ActorNarrativeProfile,
  CharacterBackstoryRevealConfig,
  NpcDisclosureStage,
  StoryEngineMemoryState,
  VisibilitySlice,
} from '../../types';

type EncounterVisibilityParams = {
  narrativeProfile?: ActorNarrativeProfile | null;
  backstoryReveal?: CharacterBackstoryRevealConfig | null;
  disclosureStage?: NpcDisclosureStage | null;
  isFirstMeaningfulContact?: boolean;
  seenBackstoryChapterIds?: string[] | null;
  storyEngineMemory?: StoryEngineMemoryState | null;
  activeThreadIds?: string[] | null;
};

type QuestVisibilityParams = {
  issuerNarrativeProfile?: ActorNarrativeProfile | null;
  storyEngineMemory?: StoryEngineMemoryState | null;
  activeThreadIds?: string[] | null;
};

type CarrierVisibilityParams = {
  activeThreadIds?: string[] | null;
  storyEngineMemory?: StoryEngineMemoryState | null;
  storyFingerprint?: {
    visibleClue?: string;
    witnessMark?: string;
    unresolvedQuestion?: string;
    currentAppearanceReason?: string;
  } | null;
};

function dedupeStrings(values: Array<string | null | undefined>, limit = 12) {
  return [...new Set(values.map((value) => value?.trim() ?? '').filter(Boolean))]
    .slice(0, limit);
}

export function createEmptyStoryEngineMemoryState(): StoryEngineMemoryState {
  return {
    discoveredFactIds: [],
    inferredFactIds: [],
    activeThreadIds: [],
    resolvedScarIds: [],
    recentCarrierIds: [],
    openedSceneChapterIds: [],
    currentSceneActState: null,
    recentSignalIds: [],
    recentCompanionReactions: [],
    currentChapter: null,
    currentJourneyBeatId: null,
    currentJourneyBeat: null,
    companionArcStates: [],
    worldMutations: [],
    chronicle: [],
    factionTensionStates: [],
    currentCampEvent: null,
    currentSetpieceDirective: null,
    continueGameDigest: null,
    campaignState: null,
    actState: null,
    consequenceLedger: [],
    companionResolutions: [],
    endingState: null,
    authorialConstraintPack: null,
    branchBudgetStatus: null,
    narrativeQaReport: null,
    narrativeCodex: [],
  };
}

function buildBaseFactIds(
  narrativeProfile?: ActorNarrativeProfile | null,
  backstoryReveal?: CharacterBackstoryRevealConfig | null,
) {
  return dedupeStrings([
    narrativeProfile ? 'publicMask' : null,
    narrativeProfile ? 'firstContactMask' : null,
    narrativeProfile ? 'visibleLine' : null,
    narrativeProfile ? 'hiddenLine' : null,
    narrativeProfile ? 'contradiction' : null,
    narrativeProfile ? 'debtOrBurden' : null,
    narrativeProfile ? 'taboo' : null,
    narrativeProfile ? 'immediatePressure' : null,
    ...(narrativeProfile?.relatedThreadIds ?? []).map((id) => `thread:${id}`),
    ...(narrativeProfile?.relatedScarIds ?? []).map((id) => `scar:${id}`),
    ...(backstoryReveal?.chapters ?? []).map((chapter) => `chapter:${chapter.id}`),
  ]);
}

function resolveUnlockedChapterIds(
  backstoryReveal?: CharacterBackstoryRevealConfig | null,
  disclosureStage?: NpcDisclosureStage | null,
  seenBackstoryChapterIds?: string[] | null,
) {
  const explicitlySeen = new Set(
    (seenBackstoryChapterIds ?? []).filter((chapterId) => typeof chapterId === 'string'),
  );

  return (backstoryReveal?.chapters ?? [])
    .filter((chapter, index) => {
      if (explicitlySeen.has(chapter.id)) return true;
      if (disclosureStage === 'partial') return index <= 0;
      if (disclosureStage === 'honest') return index <= 1;
      if (disclosureStage === 'deep') return true;
      return false;
    })
    .map((chapter) => `chapter:${chapter.id}`);
}

export function buildEncounterVisibilitySlice(
  params: EncounterVisibilityParams,
) {
  const memory = params.storyEngineMemory ?? createEmptyStoryEngineMemoryState();
  const factIds = buildBaseFactIds(params.narrativeProfile, params.backstoryReveal);
  const unlockedChapterIds = resolveUnlockedChapterIds(
    params.backstoryReveal,
    params.disclosureStage,
    params.seenBackstoryChapterIds,
  );
  const activeThreadFactIds = dedupeStrings([
    ...(params.activeThreadIds ?? []).map((id) => `thread:${id}`),
    ...(memory.activeThreadIds ?? []).map((id) => `thread:${id}`),
  ], 6);
  const sayableFactIds = dedupeStrings([
    'publicMask',
    'firstContactMask',
    'visibleLine',
    'immediatePressure',
    ...unlockedChapterIds,
    ...(params.disclosureStage === 'honest' || params.disclosureStage === 'deep'
      ? activeThreadFactIds
      : activeThreadFactIds.slice(0, 1)),
  ], 10);
  const inferredFactIds = dedupeStrings([
    'contradiction',
    ...activeThreadFactIds,
    ...(params.narrativeProfile?.reactionHooks.length
      ? params.narrativeProfile.reactionHooks.map((_, index) => `reaction:${index + 1}`)
      : []),
  ], 8);
  const forbiddenFactIds = dedupeStrings([
    'hiddenLine',
    'debtOrBurden',
    'taboo',
    ...(params.narrativeProfile?.relatedScarIds ?? []).map((id) => `scar:${id}`),
    ...(params.backstoryReveal?.chapters ?? [])
      .map((chapter) => `chapter:${chapter.id}`)
      .filter((id) => !unlockedChapterIds.includes(id)),
  ], 12);

  if (params.isFirstMeaningfulContact) {
    return {
      factIds,
      sayableFactIds: sayableFactIds.filter((factId) =>
        ['publicMask', 'firstContactMask', 'visibleLine', 'immediatePressure'].includes(
          factId,
        ) || factId.startsWith('chapter:'),
      ),
      inferredFactIds: inferredFactIds.filter((factId) =>
        factId === 'contradiction' || factId.startsWith('thread:'),
      ),
      forbiddenFactIds,
      misdirectionHints: dedupeStrings([
        params.narrativeProfile?.contradiction
          ? '对方会先拿表层说辞遮住真正的牵连。'
          : null,
        params.narrativeProfile?.taboo
          ? `提到${params.narrativeProfile.taboo}时，对方会本能地把话题拨开。`
          : null,
      ], 3),
    } satisfies VisibilitySlice;
  }

  return {
    factIds,
    sayableFactIds,
    inferredFactIds,
    forbiddenFactIds,
    misdirectionHints: dedupeStrings([
      params.narrativeProfile?.contradiction
        ? '可让模型写出“这句话不全对”的缝隙感，但不要直接盖章真相。'
        : null,
      params.disclosureStage === 'guarded'
        ? '优先谈眼前压力与表层理由，不要主动摊开完整来历。'
        : null,
    ], 3),
  } satisfies VisibilitySlice;
}

export function buildQuestVisibilitySlice(
  params: QuestVisibilityParams,
) {
  const memory = params.storyEngineMemory ?? createEmptyStoryEngineMemoryState();
  const narrativeProfile = params.issuerNarrativeProfile;
  const factIds = dedupeStrings([
    narrativeProfile ? 'publicMask' : null,
    narrativeProfile ? 'visibleLine' : null,
    narrativeProfile ? 'immediatePressure' : null,
    narrativeProfile ? 'contradiction' : null,
    ...(params.activeThreadIds ?? []).map((id) => `thread:${id}`),
    ...(memory.activeThreadIds ?? []).map((id) => `thread:${id}`),
  ]);

  return {
    factIds,
    sayableFactIds: dedupeStrings([
      'publicMask',
      'visibleLine',
      'immediatePressure',
      ...(params.activeThreadIds ?? []).map((id) => `thread:${id}`),
    ], 8),
    inferredFactIds: dedupeStrings(['contradiction'], 2),
    forbiddenFactIds: dedupeStrings([
      narrativeProfile?.hiddenLine ? 'hiddenLine' : null,
      narrativeProfile?.taboo ? 'taboo' : null,
    ], 4),
    misdirectionHints: dedupeStrings([
      narrativeProfile?.contradiction
        ? '任务发布者会给出能说得过去的表层理由，但不必一次把全部牵连说透。'
        : null,
    ], 2),
  } satisfies VisibilitySlice;
}

export function buildCarrierVisibilitySlice(
  params: CarrierVisibilityParams,
) {
  const factIds = dedupeStrings([
    params.storyFingerprint?.visibleClue ? 'visibleClue' : null,
    params.storyFingerprint?.witnessMark ? 'witnessMark' : null,
    params.storyFingerprint?.unresolvedQuestion ? 'unresolvedQuestion' : null,
    params.storyFingerprint?.currentAppearanceReason ? 'currentAppearanceReason' : null,
    ...(params.activeThreadIds ?? []).map((id) => `thread:${id}`),
  ], 8);

  return {
    factIds,
    sayableFactIds: dedupeStrings([
      'visibleClue',
      'currentAppearanceReason',
      ...(params.activeThreadIds ?? []).map((id) => `thread:${id}`),
    ], 6),
    inferredFactIds: dedupeStrings(['witnessMark', 'unresolvedQuestion'], 4),
    forbiddenFactIds: [],
    misdirectionHints: dedupeStrings([
      params.storyFingerprint?.unresolvedQuestion
        ? '保留一点未完成的问题感，不要把物件背后的旧事一次解释到底。'
        : null,
    ], 2),
  } satisfies VisibilitySlice;
}