import {
  buildRuntimeItemAiIntent,
  buildRuntimeItemAiPromptInput,
} from '../data/runtimeItemNarrative';
import type {
  RuntimeItemGenerationContext,
  RuntimeItemPlan,
  RuntimeRelationAnchor,
} from '../types';
import { buildRuntimeItemStoryFingerprint } from '../services/storyEngine/carrierNarrativeCompiler';
import { buildCarrierVisibilitySlice } from '../services/storyEngine/visibilityEngine';

function describeRelationAnchor(anchor: RuntimeRelationAnchor) {
  switch (anchor.type) {
    case 'npc':
      return `NPC:${anchor.npcName}`;
    case 'scene':
      return `场景:${anchor.sceneName}`;
    case 'monster':
      return `怪物:${anchor.monsterName}`;
    case 'quest':
      return `任务:${anchor.questName}`;
    case 'faction':
      return `势力:${anchor.factionName}`;
    default:
      return `地标:${anchor.landmarkName}`;
  }
}

function describeCarrierFactId(factId: string) {
  if (factId === 'visibleClue') return '可见线索';
  if (factId === 'currentAppearanceReason') return '当前出现理由';
  if (factId === 'witnessMark') return '见证痕';
  if (factId === 'unresolvedQuestion') return '未完成问题';
  if (factId.startsWith('thread:')) return `线程索引(${factId.slice('thread:'.length)})`;
  return factId;
}

function describePlan(
  context: RuntimeItemGenerationContext,
  plan: RuntimeItemPlan,
  index: number,
) {
  const promptInput = buildRuntimeItemAiPromptInput(context, plan);
  const fallbackIntent = buildRuntimeItemAiIntent(context, plan);
  const fallbackFingerprint = buildRuntimeItemStoryFingerprint({
    context,
    plan,
    intent: fallbackIntent,
  });
  const visibilitySlice = buildCarrierVisibilitySlice({
    activeThreadIds: context.activeThreadIds,
    storyFingerprint: fallbackFingerprint,
  });

  return [
    `物品 ${index + 1}`,
    `- slot: ${plan.slot}`,
    `- 物品类型: ${promptInput.desiredItemKind}`,
    `- 持续性: ${promptInput.permanence}`,
    `- 关系锚点: ${describeRelationAnchor(plan.relationAnchor)}`,
    `- 世界摘要: ${promptInput.worldSummary}`,
    `- 场景摘要: ${promptInput.sceneSummary || '无'}`,
    `- 遭遇摘要: ${promptInput.encounterSummary || '无'}`,
    `- 相关人物: ${promptInput.relatedNpcSummary}`,
    `- 当前激活线程: ${promptInput.activeThreadSummary || '暂无'}`,
    `- 近期剧情: ${promptInput.recentStorySummary}`,
    `- 玩家当前 build: ${promptInput.playerBuildDirection.join('、') || '均衡'}`,
    `- 玩家待补缺口: ${promptInput.playerBuildGaps.join('、') || '无明显缺口'}`,
    `- 本次目标方向: ${plan.targetBuildDirection.join('、') || '均衡'}`,
    `- 物件可直写线索: ${visibilitySlice.sayableFactIds.map(describeCarrierFactId).join('、') || '无'}`,
    `- 物件只宜暗写: ${visibilitySlice.inferredFactIds.map(describeCarrierFactId).join('、') || '无'}`,
  ].join('\n');
}

export const RUNTIME_ITEM_INTENT_SYSTEM_PROMPT = `你是 AI 原生叙事 RPG 的运行时物品导演。
你只返回 JSON，不要输出 Markdown、解释或代码块。

输出结构：
{
  "intents": [
    {
      "shortNameSeed": "中文短种子",
      "sourcePhrase": "中文来源短语",
      "reasonToAppear": "中文出现理由",
      "relationHooks": ["中文关系钩子"],
      "desiredBuildTags": ["中文 build 标签"],
      "desiredFunctionalBias": ["heal|mana|cooldown|guard|damage"],
      "tone": "grim|mysterious|martial|ritual|survival",
      "visibleClue": "玩家第一眼能抓到的痕迹",
      "witnessMark": "它见证过什么的使用痕",
      "unfinishedBusiness": "背后仍未结清的问题",
      "hiddenHook": "更深一层但别直接讲穿的钩子",
      "reactionHooks": ["以后谁会对它起反应"],
      "namingPattern": "命名范式建议"
    }
  ]
}

规则：
- intents 数量必须与输入物品数量完全一致，顺序也必须一致。
- 所有自然语言字段都必须使用中文。
- 物品意图必须贴合当前场景、关系锚点、近期剧情和玩家当前 build。
- visibleClue / witnessMark / unfinishedBusiness / hiddenHook 要优先围绕当前激活线程、相关角色压力和旧痕来写。
- desiredBuildTags 要优先围绕玩家当前 build 与待补缺口，不要写空数组。
- desiredFunctionalBias 只能从给定枚举里选 1 到 2 个。
- reasonToAppear 必须解释为什么这件东西会在当前局势里出现，而不是泛泛描述。`;

export function buildRuntimeItemIntentPrompt(params: {
  context: RuntimeItemGenerationContext;
  plans: RuntimeItemPlan[];
}) {
  return [
    `生成渠道：${params.context.generationChannel}`,
    `以下每个物品都需要给出一条可编译的运行时物品意图。`,
    ...params.plans.map((plan, index) => describePlan(params.context, plan, index)),
    '请严格返回 JSON。',
  ].join('\n\n');
}