// 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
)
`);
/* an object has:
  id = primary key 
  number = object identifier number

  title / NAME = a short display name for an object, or the title of a page
  description / TEXT? = the markdown description of an object, or the lua script of the source code of a verb

  html = the markdown for that object, rendered into html for display as a page
  lua = the lua source code of the object, rendered into html with syntax highlighting

  time = when this edit was saved
  author = the user id of whoever authored this revision

  type = 0 for noun, 1 for verb

*/

/* an attribute store has:
  number = the object number it's attached to
  contents = a `text` object holding a json store of attributes defined on object #number, containing:
    LOCATION? = the object which contains this object? should this be in the DB or in the json store?
    PROTOTYPE = the number of the prototype for this object, to which we should look for attributes not found here
    ATTRIBUTES? = json object of attached, script-controlled attributes.

    CONTENTS = json array of objectss contained inside this one
    verbs = json array of objecsts which are verbs on this one
    prepositions
*/


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

  name varchar(64) unique,
  password varchar(128)
)
`);
/* a user has:
  id = primary key
  name = name string
  password = argon2 hash of their password

  character = object in the game world representing your character
*/

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)();