// 将参考语法体系(ref-data.json)灌入 grammar_point 表;仅当表为空时执行
import fs from "node:fs";
import path from "node:path";
import { sql } from "drizzle-orm";
import { drizzle } from "drizzle-orm/mysql2";
import mysql from "mysql2/promise";
import { grammarPoints } from "../src/db/schema";

type RefPoint = {
  id: string;
  title: string;
  difficulty: number;
  prereq: string[];
  summary: string;
  md: string;
};
type RefLevel = { id: string; name: string; points: RefPoint[] };

async function main() {
  const file = path.join(process.cwd(), "src/content/grammar/ref-data.json");
  const data = JSON.parse(fs.readFileSync(file, "utf8")) as { levels: RefLevel[] };
  const conn = await mysql.createConnection(process.env.DATABASE_URL!);
  const db = drizzle(conn);

  const [cnt] = await db.select({ n: sql<number>`COUNT(*)` }).from(grammarPoints);
  if (cnt.n > 0) {
    console.log("grammar_point 已有", cnt.n, "条,跳过种子");
    await conn.end();
    return;
  }

  let seq = 0;
  const rows = [];
  for (const lvl of data.levels) {
    for (const p of lvl.points) {
      seq += 1;
      rows.push({
        pointId: p.id,
        level: lvl.id,
        levelName: lvl.name,
        title: p.title,
        difficulty: p.difficulty,
        summary: p.summary,
        prereq: JSON.stringify(p.prereq ?? []),
        md: p.md,
        seq,
      });
    }
  }
  await db.insert(grammarPoints).values(rows);
  console.log("已写入 grammar_point:", rows.length, "条");
  await conn.end();
}

main();