/**
 * # 脚本 同步文章分类成员（dump 快照 → 原站当前状态）
 *
 * 背景：/blog/ 归档本地 302 篇（26 页）vs 原站当前 7 页——dump 之后原站调整了
 * Blog/Gateway 等分类的成员。本脚本按原站 REST API 的 categories 重建本地
 * content_terms 分类关联（仅调整 REST 返回的文章；本地有而原站已删除的不动）。
 *
 * 用法：bun scripts/import-live-terms.ts [--dry]
 */
import { SQL } from "bun";

const LIVE = "https://www.dusuniot.com";
const sql = new SQL(process.env.DATABASE_URL || "postgres://dusuniot:dusuniot@127.0.0.1:25432/dusuniot", { max: 1 });
const dry = process.argv.includes("--dry");

/** 本地分类 legacy_id → id（WP term id 与 legacy_id 一致） */
const catRows = await sql`select id, legacy_id, slug from categories where taxonomy = 'category' and legacy_id is not null`;
const catByLegacy = new Map<number, number>(catRows.map((r: any) => [Number(r.legacy_id), r.id as number]));

/** 本地已发布文章 legacy_id → content id */
const posts = await sql`select id, legacy_id from contents where type = 'post' and status = 'published' and legacy_id is not null`;
const contentByLegacy = new Map<number, number>(posts.map((r: any) => [Number(r.legacy_id), r.id as number]));
console.log("本地已发布文章:", posts.length);

/** 逐页拉原站文章的分类（_fields 精简返回） */
const liveCats = new Map<number, number[]>(); // wp post id → term ids
let page = 1;
while (true) {
  const res = await fetch(`${LIVE}/wp-json/wp/v2/posts?per_page=100&page=${page}&_fields=id,categories`, { headers: { "User-Agent": "Mozilla/5.0" } });
  if (!res.ok) {
    if (res.status === 400) break; // 翻页越界
    console.log("REST", res.status, "停止");
    break;
  }
  const items = (await res.json()) as { id: number; categories: number[] }[];
  for (const it of items) liveCats.set(it.id, it.categories || []);
  if (items.length < 100) break;
  page++;
  await new Promise((r) => setTimeout(r, 400)); // 限速（429 防护）
}
console.log("原站文章:", liveCats.size);

let added = 0, removed = 0;
for (const [wpId, cats] of liveCats) {
  const cid = contentByLegacy.get(wpId);
  if (!cid) continue;
  const localRows = await sql`select category_id from content_terms where content_id = ${cid}`;
  const localSet = new Set(localRows.map((r: any) => r.category_id as number));
  const liveSet = new Set(cats.map((t) => catByLegacy.get(t)).filter((x): x is number => x != null));
  for (const add of liveSet) {
    if (localSet.has(add)) continue;
    added++;
    if (!dry) await sql`insert into content_terms (content_id, category_id) values (${cid}, ${add}) on conflict do nothing`;
  }
  for (const rm of localSet) {
    if (liveSet.has(rm)) continue;
    removed++;
    if (!dry) await sql`delete from content_terms where content_id = ${cid} and category_id = ${rm}`;
  }
}
console.log(`分类成员同步: 新增 ${added} 移除 ${removed}${dry ? "（dry 未写库）" : ""}`);
await sql.end();