import type { EntityType, PageType } from "@src/shared";
import type { ClassifierHints } from "@src/observers";
import type { SocialPlatformAdapter, UrlEntityRule } from "./adapter.ts";

/** Reddit adapter — Phase 1 platform (new web UI, `shreddit-*` custom elements, GraphQL + `.json` payloads). */
const classifierHints: ClassifierHints = {
  platform: "reddit",
  idKeys: { postId: "post", commentId: "comment", subredditId: "community", authorId: "profile" },
  urlForId: (type: EntityType, id: string) => {
    if (type === "post" && /^t3_/.test(id)) return `https://www.reddit.com/comments/${id.slice(3)}`;
    if (type === "post" && /^[a-z0-9]{5,8}$/.test(id)) return `https://www.reddit.com/comments/${id}`;
    return undefined;
  },
};

const urlEntityRules: UrlEntityRule[] = [
  { pattern: /^\/r\/([\w]+)\/comments\/([a-z0-9]+)\/[^/]*\/([a-z0-9]+)/, type: "comment", id: (m) => `t1_${m[3]}`, confidence: 0.9 },
  { pattern: /^\/r\/([\w]+)\/comments\/([a-z0-9]+)/, type: "post", id: (m) => `t3_${m[2]}`, confidence: 0.95 },
  { pattern: /^\/comments\/([a-z0-9]+)/, type: "post", id: (m) => `t3_${m[1]}`, confidence: 0.9 },
  { pattern: /^\/(?:user|u)\/([\w-]+)\/?(?:\?|$)/, type: "profile", id: (m) => m[1]?.toLowerCase(), confidence: 0.92 },
  { pattern: /^\/r\/([\w]+)\/?(?:\?|$)/, type: "community", id: (m) => m[1]?.toLowerCase(), confidence: 0.92 },
];

export const redditAdapter: SocialPlatformAdapter = {
  platform: "reddit",
  homeUrl: "https://www.reddit.com/",
  hosts: /(^|\.)reddit\.com$|^redd\.it$/,
  pageTypeHints: [
    { pattern: /^\/search\/?\?/, page_type: "SEARCH_RESULTS", confidence: 0.95 },
    { pattern: /\/comments\//, page_type: "POST_DETAIL", confidence: 0.95 },
    { pattern: /^\/(user|u)\//, page_type: "PROFILE", confidence: 0.92 },
    { pattern: /^\/r\/[\w]+\/?(\?|$|\/(hot|new|top|rising))/, page_type: "GROUP", confidence: 0.9 },
    { pattern: /^\/?(\?|$)|^\/(popular|all|best)/, page_type: "HOME_FEED", confidence: 0.9 },
  ],
  urlEntityRules,
  classifierHints,
  searchUrl: (q) => `https://www.reddit.com/search/?q=${encodeURIComponent(q)}`,
  isNoiseLink: (href, text) => /^\/(settings|premium|coins|policies|help|topics|best\/communities|answers)/.test(href.pathname) || /^(Home|Popular|All|Accueil|Populaire)$/i.test(text),
  entityLabel: (t) => ({ post: "post", comment: "comment", profile: "user", community: "subreddit" } as Partial<Record<EntityType, string>>)[t] ?? t,
  expectedEntities: (t: PageType) => ({ HOME_FEED: 6, SEARCH_RESULTS: 5, POST_DETAIL: 3, GROUP: 6, PROFILE: 3 } as Partial<Record<PageType, number>>)[t] ?? 0,
};