import { Inject, Provide } from '@midwayjs/core';
import { BaseService, CoolCommException } from '@cool-midway/core';
import { InjectEntityModel } from '@midwayjs/typeorm';
import { Repository } from 'typeorm';
import { CardInfoEntity } from '../entity/info';
import { CardBentoEntity } from '../entity/bento';
import {
  BentoBlockPublic,
  BentoBlockType,
  BentoColSpan,
  BentoRowSpan,
  CardPortalDetail,
} from '../../../comm/types/omni';

/**
 * 本地内存缓存项
 */
interface CacheItem {
  data: CardPortalDetail;
  expiresAt: number;
}

/**
 * 访客端公开微官网门户服务
 *
 * 核心特性：
 * 1. 免登录无鉴权查询已发布名片
 * 2. 自动聚合全部有效 Bento 组件块 (按 sortOrder 升序排列)
 * 3. 严格数据安全脱敏 (剔除员工 userId、后台 remark、内部配置 internalConfig 等)
 * 4. 高并发多级缓存加速与首屏秒开优化 (<500ms)
 */
@Provide()
export class CardPortalService extends BaseService {
  @InjectEntityModel(CardInfoEntity)
  cardInfoEntity: Repository<CardInfoEntity>;

  @InjectEntityModel(CardBentoEntity)
  cardBentoEntity: Repository<CardBentoEntity>;

  @Inject()
  ctx: unknown;

  /**
   * 本地高速 L1 缓存 (支持秒开与高并发)
   */
  private static localCache = new Map<string, CacheItem>();

  /**
   * 默认缓存过期时长 (毫秒，默认 60 秒)
   */
  private readonly defaultTtlMs = 60 * 1000;

  /**
   * 获取微官网公开详情 (通过名片 ID 或自定义 Slug 短链)
   *
   * @param slugOrId 名片主键 ID 或 自定义短链标识
   * @returns 脱敏后的微官网聚合资产
   */
  async getPortalDetail(slugOrId: string | number): Promise<CardPortalDetail> {
    if (slugOrId === undefined || slugOrId === null || slugOrId === '') {
      throw new CoolCommException('参数错误：缺少名片标识', 400);
    }

    const queryKey = String(slugOrId).trim();
    if (!queryKey) {
      throw new CoolCommException('参数错误：缺少名片标识', 400);
    }

    // 1. 尝试从高速缓存读取
    const cached = this.getFromCache(queryKey);
    if (cached) {
      return cached;
    }

    // 2. 判定查询维度 (ID 优先或 Slug 优先)
    const isNumeric = /^\d+$/.test(queryKey);
    let card: CardInfoEntity | null = null;

    if (isNumeric) {
      card = await this.cardInfoEntity.findOne({
        where: [{ id: Number(queryKey) }, { slug: queryKey }],
      });
    } else {
      card = await this.cardInfoEntity.findOne({
        where: { slug: queryKey },
      });
    }

    // 3. 实体存在性与发布状态检查
    if (!card) {
      throw new CoolCommException('名片不存在或已下线', 404);
    }

    if (card.status !== 'published') {
      throw new CoolCommException('名片未发布或已下线', 404);
    }

    // 4. 查询关联的有效 Bento 组件块列表 (status = 1)
    const rawBlocks = await this.cardBentoEntity.find({
      where: {
        cardId: Number(card.id),
        status: 1,
      },
      order: {
        sortOrder: 'ASC',
        id: 'ASC',
      } as any,
    });

    // 5. 数据脱敏与公开资产结构清洗 (剔除 internalNotes 与内部 status)
    const bentoBlocks: BentoBlockPublic[] = (rawBlocks || [])
      .sort(
        (a, b) =>
          (a.sortOrder ?? 0) - (b.sortOrder ?? 0) || Number(a.id) - Number(b.id)
      )
      .map(b => ({
        id: b.id,
        cardId: b.cardId,
        type: b.type as BentoBlockType,
        colSpan: b.colSpan as BentoColSpan,
        rowSpan: b.rowSpan as BentoRowSpan,
        sortOrder: b.sortOrder,
        title: b.title,
        content: b.content,
        mediaUrl: b.mediaUrl,
        linkUrl: b.linkUrl,
        metaJson: b.metaJson,
      }));

    // 6. 构造对外聚合模型 (敏感信息 userId、remark、internalConfig 严禁输出)
    const portalDetail: CardPortalDetail = {
      id: card.id,
      slug: card.slug,
      name: card.name,
      title: card.title,
      company: card.company,
      slogan: card.slogan,
      avatarUrl: card.avatarUrl,
      phone: card.phone,
      email: card.email,
      whatsapp: card.whatsapp,
      linkedin: card.linkedin,
      timezone: card.timezone,
      audioPronunciationUrl: card.audioPronunciationUrl,
      themeCode: card.themeCode,
      status: card.status,
      bentoBlocks,
      cachedAt: Date.now(),
    };

    // 7. 写入多键关联高速缓存
    this.setToCache(portalDetail);

    return portalDetail;
  }

  /**
   * 清除名片相关的微官网缓存 (供名片/Bento 编辑发布时调用)
   *
   * @param idOrSlug 名片 ID 或 Slug
   */
  async clearPortalCache(idOrSlug: string | number): Promise<void> {
    const key = String(idOrSlug).trim();
    CardPortalService.localCache.delete(`id:${key}`);
    CardPortalService.localCache.delete(`slug:${key}`);

    // 同时遍历清除关联包含的缓存
    for (const [cacheKey, item] of CardPortalService.localCache.entries()) {
      if (
        String(item.data.id) === key ||
        (item.data.slug && item.data.slug === key)
      ) {
        CardPortalService.localCache.delete(cacheKey);
      }
    }
  }

  /**
   * 清除所有微官网本地缓存 (供全量重置或单测环境隔离使用)
   */
  static clearAllCache(): void {
    CardPortalService.localCache.clear();
  }

  /**
   * 从缓存中读取数据 (包含过期检查)
   */
  private getFromCache(key: string): CardPortalDetail | null {
    const now = Date.now();
    const tryKeys = [`id:${key}`, `slug:${key}`];

    for (const k of tryKeys) {
      const item = CardPortalService.localCache.get(k);
      if (item) {
        if (item.expiresAt > now) {
          return item.data;
        }
        // 过期自动清理
        CardPortalService.localCache.delete(k);
      }
    }
    return null;
  }

  /**
   * 写入缓存，支持 ID 与 Slug 双重检索命中
   */
  private setToCache(detail: CardPortalDetail): void {
    const expiresAt = Date.now() + this.defaultTtlMs;
    const item: CacheItem = {
      data: detail,
      expiresAt,
    };

    if (detail.id !== undefined && detail.id !== null) {
      CardPortalService.localCache.set(`id:${detail.id}`, item);
    }
    if (detail.slug) {
      CardPortalService.localCache.set(`slug:${detail.slug}`, item);
    }
  }
}