// this is a horrible script i use and edit for db revisions and migrations. i hate it.
// i should have a db migration plan but this is not, and probably never will be, big
// enough of a project to really warrant it.

const sqlite = require("better-sqlite3");
const showdown = require("showdown");
const db = new sqlite('the_big_db.db', { verbose: console.log });

const converter = new showdown.Converter();

const createPages = db.prepare(`
create table if not exists pages (
  id integer primary key,
  number integer autoincrement,

  title varchar(255),
  
  description text,
  html text,

  time timestamp default current_timestamp,
  author integer
)
`);

const createUsers = db.prepare(`
create table if not exists users (
  id integer primary key,

  name varchar(64) unique,
  password varchar(128)
)
`);


function migratePages() {
  console.log("moving old table to a temporary");
  console.log(db.prepare(`alter table pages rename to old_pages`).run())

  console.log("creating new page table")
  console.log(createPages.run());

  console.log('iterating over old pages');
  rows = db.prepare(`select * from old_pages`).all();

  const insertPage = db.prepare(`insert into pages (number, title, description, html) values (:id, :title, :description, :html)`);

  rows.forEach((pageData) => {
    const {id, title, description, html} = pageData;
    console.log(`rendering page number ${id}`)

    const renderedPage = converter.makeHtml(description);

    insertPage.run({...pageData, html: renderedPage});
  });

  console.log("getting rid of old table");
  console.log(db.prepare("drop table old_pages").run());
}

db.transaction(migratePages)();

function migrateUsers() {
  console.log("moving old users");
  console.log(db.prepare("alter table users rename to old_users").run());

  console.log("creating new users table");
  console.log(createUsers.run());

  const insertUser = db.prepare("insert into users (name, password) values (:name, :password)")
  db.prepare("select * from old_users").all().forEach((user) => {
    console.log(insertUser.run(user));
  });

  console.log("clearing old table");
  console.log(db.prepare("drop table old_users").run());
}

db.transaction(migrateUsers)();