import {
  buildCarrierNarrativeDescription,
  buildCarrierNarrativeName,
  buildRuntimeItemStoryFingerprint,
} from '../services/storyEngine/carrierNarrativeCompiler';
import type {
  DirectedRuntimeReward,
  InventoryItem,
  RuntimeItemAiIntent,
  RuntimeItemAiPromptInput,
  RuntimeItemGenerationContext,
  RuntimeItemPlan,
  RuntimeRelationAnchor,
} from '../types';

function sanitizeFragment(value: string | null | undefined, maxLength = 4) {
  return (value ?? '')
    .replace(/[^\u4e00-\u9fa5a-z0-9]/giu, '')
    .slice(0, maxLength);
}

function resolveAnchorLabel(anchor: RuntimeRelationAnchor) {
  switch (anchor.type) {
    case 'npc':
      return anchor.npcName;
    case 'scene':
      return anchor.sceneName;
    case 'landmark':
      return anchor.landmarkName;
    case 'monster':
      return anchor.monsterName;
    case 'faction':
      return anchor.factionName;
    case 'quest':
      return anchor.questName;
    default:
      return '无名之地';
  }
}

export function buildRuntimeItemAiPromptInput(
  context: RuntimeItemGenerationContext,
  plan: RuntimeItemPlan,
): RuntimeItemAiPromptInput {
  const storyGraph = context.customWorldProfile?.storyGraph;
  const activeThreadSummary = (context.activeThreadIds ?? [])
    .map((threadId) =>
      [...(storyGraph?.visibleThreads ?? []), ...(storyGraph?.hiddenThreads ?? [])]
        .find((thread) => thread.id === threadId)?.title ?? threadId,
    )
    .join('、');

  return {
    worldSummary: context.customWorldProfile?.summary ?? context.worldType ?? '未知世界',
    sceneSummary: [context.sceneName, context.sceneDescription].filter(Boolean).join(' / '),
    encounterSummary: [context.encounterNpcName, context.encounterContextText].filter(Boolean).join(' / '),
    relatedNpcSummary: context.relatedNpcNarrativeProfile
      ? `${context.encounterNpcName ?? '相关人物'}：公开面 ${context.relatedNpcNarrativeProfile.publicMask}；当前压力 ${context.relatedNpcNarrativeProfile.immediatePressure}`
      : context.relatedNpcState
        ? `${context.encounterNpcName ?? '相关人物'} 当前好感 ${context.relatedNpcState.affinity}`
        : '暂无明确人物关系',
    recentStorySummary: context.recentStorySummary,
    activeThreadSummary,
    generationChannel: context.generationChannel,
    playerBuildDirection: context.playerBuildTags,
    playerBuildGaps: context.playerBuildGaps,
    desiredItemKind: plan.itemKind,
    permanence: plan.permanence,
  };
}

export function buildRuntimeItemAiIntent(
  context: RuntimeItemGenerationContext,
  plan: RuntimeItemPlan,
): RuntimeItemAiIntent {
  const anchorLabel = resolveAnchorLabel(plan.relationAnchor);
  const sourceSeed = sanitizeFragment(context.sceneName, 4)
    || sanitizeFragment(context.customWorldProfile?.name, 4)
    || sanitizeFragment(anchorLabel, 4)
    || '旧誓';
  const functionalBias: RuntimeItemAiIntent['desiredFunctionalBias'] = [];

  if (plan.permanence === 'timed') {
    functionalBias.push(context.playerBuildGaps.includes('survival_gap') ? 'heal' : 'cooldown');
  }
  if (context.playerBuildGaps.includes('mana_gap')) functionalBias.push('mana');
  if (context.playerBuildGaps.includes('survival_gap')) functionalBias.push('guard');
  if (
    functionalBias.length <= 0
    || context.playerBuildGaps.includes('finisher_gap')
    || plan.itemKind === 'equipment'
  ) {
    functionalBias.push('damage');
  }

  return {
    shortNameSeed: sourceSeed,
    sourcePhrase: anchorLabel,
    reasonToAppear: context.generationChannel === 'monster_drop'
      ? `${anchorLabel}倒下后，${context.sceneName ?? '这片战场'}里最值得带走的残留被翻了出来。`
      : `${anchorLabel}与最近局势把它推到了你面前。`,
    relationHooks: [
      context.encounterContextText ?? context.sceneName ?? anchorLabel,
      ...context.recentActions,
    ].filter(Boolean).slice(0, 2) as string[],
    desiredBuildTags: [...new Set([
      ...plan.targetBuildDirection,
      ...context.playerBuildTags.slice(0, 2),
    ])].slice(0, 3),
    desiredFunctionalBias: [...new Set(functionalBias)].slice(0, 2),
    tone: context.generationChannel === 'monster_drop'
      ? 'grim'
      : context.generationChannel === 'quest_reward'
        ? 'ritual'
        : context.playerBuildGaps.includes('survival_gap')
          ? 'survival'
          : 'martial',
    visibleClue:
      context.relatedNpcNarrativeProfile?.visibleLine
      ?? `${anchorLabel}身上留下的旧痕`,
    witnessMark:
      context.relatedNpcNarrativeProfile?.debtOrBurden
      ?? `${anchorLabel}尚未散尽的使用痕`,
    unfinishedBusiness:
      context.relatedNpcNarrativeProfile?.contradiction
      ?? `${anchorLabel}背后还有没说完的问题`,
    hiddenHook:
      context.relatedNpcNarrativeProfile?.taboo
      ?? `${anchorLabel}为什么会在此刻重新出现`,
    reactionHooks: [
      ...(context.relatedNpcNarrativeProfile?.reactionHooks ?? []),
      ...(context.activeThreadIds ?? []),
    ].slice(0, 4),
    namingPattern:
      plan.itemKind === 'quest'
        ? 'quest_evidence'
        : plan.itemKind === 'material'
          ? 'scene_relic'
          : plan.relationAnchor.type === 'monster'
            ? 'monster_trophy'
          : plan.relationAnchor.type === 'npc'
            ? 'npc_relic'
            : 'faction_issue',
  };
}

export function applyRuntimeItemNarrative(params: {
  item: InventoryItem;
  context: RuntimeItemGenerationContext;
  plan: RuntimeItemPlan;
  intent: RuntimeItemAiIntent;
}) {
  const fingerprint = buildRuntimeItemStoryFingerprint(params);
  const runtimeMetadata =
    params.item.runtimeMetadata ?? {
      origin: 'ai_compiled' as const,
      generationChannel: params.context.generationChannel,
      seedKey: `${params.context.generationChannel}:${params.item.id}`,
      sourceReason: params.intent.reasonToAppear,
    };

  return {
    ...params.item,
    name: buildCarrierNarrativeName(params),
    description: buildCarrierNarrativeDescription(params),
    runtimeMetadata: {
      ...runtimeMetadata,
      storyFingerprint: fingerprint,
    },
  } satisfies InventoryItem;
}

export function applyRuntimeItemNarrativeToExistingItem(params: {
  item: InventoryItem;
  context: RuntimeItemGenerationContext;
  plan: RuntimeItemPlan;
  intent: RuntimeItemAiIntent;
  preserveName?: boolean;
}) {
  const fingerprint = buildRuntimeItemStoryFingerprint(params);
  const runtimeMetadata =
    params.item.runtimeMetadata ?? {
      origin: 'procedural' as const,
      generationChannel: params.context.generationChannel,
      relationAnchor: params.plan.relationAnchor,
      seedKey: `${params.context.generationChannel}:${params.item.id}`,
      sourceReason: params.intent.reasonToAppear,
    };

  return {
    ...params.item,
    name: params.preserveName
      ? params.item.name
      : buildCarrierNarrativeName(params),
    description: buildCarrierNarrativeDescription(params),
    runtimeMetadata: {
      ...runtimeMetadata,
      relationAnchor: runtimeMetadata.relationAnchor ?? params.plan.relationAnchor,
      sourceReason: params.intent.reasonToAppear,
      storyFingerprint: fingerprint,
    },
  } satisfies InventoryItem;
}

export function describeRuntimeRelationAnchor(anchor: RuntimeRelationAnchor | undefined) {
  if (!anchor) return '无明确锚点';
  return `${anchor.type}:${resolveAnchorLabel(anchor)}`;
}

export function flattenDirectedRuntimeRewardItems(reward: DirectedRuntimeReward) {
  return [
    ...(reward.primaryItem ? [reward.primaryItem] : []),
    ...reward.supportItems,
  ];
}

export function buildRuntimeRewardStoryHint(reward: DirectedRuntimeReward) {
  const primaryItem = reward.primaryItem;
  const fingerprint = primaryItem?.runtimeMetadata?.storyFingerprint;
  if (!primaryItem) {
    return reward.storyHint ?? '你得到了一件与当前局势相关的物品。';
  }
  if (reward.storyHint) {
    return reward.storyHint;
  }
  if (fingerprint) {
    return `${primaryItem.name}先露出的是“${fingerprint.visibleClue}”，但它背后还压着“${fingerprint.unresolvedQuestion}”。`;
  }
  return `这次得到的核心物件是 ${primaryItem.name}。`;
}