// libs/common/src/cache/cache-keys.ts
import type { AdType } from '../ads/ad-types';

/**
 * Video sort key type for video listing and pooling.
 */
export type VideoSortKey = 'latest' | 'popular' | 'manual';

/**
 * Video home section key type for home page sections.
 */
export type VideoHomeSectionKey = 'featured' | 'latest' | 'editorPick';

/**
 * Centralized Redis logical keys (without REDIS_KEY_PREFIX).
 * Actual keys in Redis will be: <REDIS_KEY_PREFIX><logicalKey>
 * e.g. "box:" + "app:channel:all" => "box:app:channel:all"
 */
export const CacheKeys = {
  // ─────────────────────────────────────────────
  // CHANNELS (existing)
  // ─────────────────────────────────────────────
  appChannelAll: 'app:channel:all',
  appChannelById: (channelId: string | number): string =>
    `app:channel:by-id:${channelId}`,

  // NEW: Channel → Categories tree (future use)
  appChannelWithCategories: (channelId: string | number): string =>
    `app:channel:with-categories:${channelId}`,

  // ─────────────────────────────────────────────
  // CATEGORIES (existing)
  // ─────────────────────────────────────────────
  appCategory: (categoryId: string | number): string =>
    `app:category:${categoryId}`,
  appCategoryAll: 'app:category:all',
  appCategoryById: (categoryId: string | number): string =>
    `app:category:by-id:${categoryId}`,

  // NEW: Category → Tags tree (main for video listing)
  appCategoryWithTags: (categoryId: string | number): string =>
    `app:category:with-tags:${categoryId}`,

  // ─────────────────────────────────────────────
  // TAGS (new)
  // ─────────────────────────────────────────────
  // Global tag suggestion pool
  appTagAll: 'app:tag:all',

  // (Optional future)
  // appTagByCategory: (categoryId: string | number): string =>
  //   `app:tag:by-category:${categoryId}`,
  // appTagByChannel: (channelId: string | number): string =>
  //   `app:tag:by-channel:${channelId}`,

  // ─────────────────────────────────────────────
  // ADS (existing)
  // ─────────────────────────────────────────────
  appAdById: (adId: string | number): string => `app:ad:by-id:${adId}`,

  // ─────────────────────────────────────────────
  // AD POOLS (AdType-based)
  // ─────────────────────────────────────────────
  /** Build the canonical ad pool key for a given AdType. */
  appAdPoolByType: (adType: AdType | string): string => `app:adpool:${adType}`,

  // ─────────────────────────────────────────────
  // VIDEO LISTS (existing)
  // ─────────────────────────────────────────────
  appHomeVideoPage: (page: number): string => `app:videolist:home:page:${page}`,

  appChannelVideoPage: (channelId: string | number, page: number): string =>
    `app:videolist:channel:${channelId}:page:${page}`,

  appTrendingVideoPage: (countryCode: string, page: number): string =>
    `app:videolist:trending:${countryCode}:page:${page}`,

  // ─────────────────────────────────────────────
  // VIDEO DETAILS & METADATA
  // ─────────────────────────────────────────────
  /** Get cache key for video detail data. */
  appVideoDetailKey: (videoId: string): string => `app:video:detail:${videoId}`,

  /** Get cache key for video category list by channel. */
  appVideoCategoryListKey: (channelId: string): string =>
    `app:video:category:list:${channelId}`,

  /** Get cache key for video tag list by channel and category. */
  appVideoTagListKey: (channelId: string, categoryId: string): string =>
    `app:video:tag:list:${channelId}:${categoryId}`,

  // ─────────────────────────────────────────────
  // VIDEO POOLS (sorted listings)
  // ─────────────────────────────────────────────
  /** Get cache key for videos in a category with sort order. */
  appVideoCategoryPoolKey: (
    channelId: string,
    categoryId: string,
    sort: VideoSortKey,
  ): string => `app:video:list:category:${channelId}:${categoryId}:${sort}`,

  /** Get cache key for videos with a specific tag with sort order. */
  appVideoTagPoolKey: (
    channelId: string,
    tagId: string,
    sort: VideoSortKey,
  ): string => `app:video:list:tag:${channelId}:${tagId}:${sort}`,

  /** Get cache key for home page video section. */
  appVideoHomeSectionKey: (
    channelId: string,
    section: VideoHomeSectionKey,
  ): string => `app:video:list:home:${channelId}:${section}`,
};