import {nanoid} from "nanoid";

import Migration from "../../db/Migration.js";
import ModelFactory from "../../db/ModelFactory.js";
import MagicLink from "../models/MagicLink.js";
import MagicLinkUserNameComponent from "../models/MagicLinkUserNameComponent.js";
import User from "../models/User.js";
import UserNameComponent from "../models/UserNameComponent.js";

export default class AddNameToUsersMigration extends Migration {
    public async install(): Promise<void> {
        await this.query(`ALTER TABLE users
            ADD COLUMN name VARCHAR(64) NOT NULL`);
        await this.query(`ALTER TABLE magic_links
            ADD COLUMN username VARCHAR(64) DEFAULT NULL`);

        // Give every user a random name
        const users = await User.select().get(this.getCurrentConnection());
        const callbacks: (() => Promise<void>)[] = [];
        await Promise.all(users.map(user => {
            user.name = nanoid();
            return user.save(this.getCurrentConnection(), c => callbacks.push(c));
        }));
        await Promise.all(callbacks);

        await this.query(`ALTER TABLE users
            ADD CONSTRAINT UNIQUE (name)`);
    }

    public async rollback(): Promise<void> {
        await this.query('ALTER TABLE users DROP COLUMN name');
        await this.query('ALTER TABLE magic_links DROP COLUMN username');
    }

    public registerModels(): void {
        ModelFactory.get(User).addComponent(UserNameComponent);
        ModelFactory.get(MagicLink).addComponent(MagicLinkUserNameComponent);
    }
}