import { readdir, readFile } from "fs/promises";
import { join } from "path";
import * as yaml from "js-yaml";
import { plainToClass } from "class-transformer";
import { validate } from "class-validator";

import { init, Page } from "./db";
import { Page as PageConfig } from "./page";

// TODO: configure this thru cmdline or something later
let materials_dir = "../material";
let db_file = "test.db";

let db;

async function loadPageIntoDb(name: string): Promise<void> {
  // check if this slug has already been loaded into the database

  let path = join(materials_dir, name);
  let rawData = await readFile(path, { encoding: "utf8" });
  let parsedData = yaml.load(rawData);
  let page_config = plainToClass(PageConfig, parsedData);
  await validate(page_config);
  console.log("Validated!", page_config);

  let page = new Page({
    slug: page_config.slug,
    title: page_config.title,
  });
  await page.save();
}

async function main() {
  db = await init(db_file);

  // TODO: streaming version of readdir when the folder gets big
  let names = await readdir(materials_dir);
  
  await Promise.all(names
    .filter(name => name.toLowerCase().endsWith(".yml"))
    .map(loadPageIntoDb)
  );
}

main();