const {Sequelize} = require('sequelize');

module.exports.paginateResults = ({

after: cursor,

pageSize = 20,

results,

// can pass in a function to calculate an item's cursor

getCursor = () => null,

}) => {

if (pageSize < 1) return [];

if (!cursor) return results.slice(0, pageSize);

const cursorIndex = results.findIndex(item => {

// if an item has a `cursor` on it, use that, otherwise try to generate one

let itemCursor = item.cursor ? item.cursor : getCursor(item);

// if there's still not a cursor, return false by default

return itemCursor ? cursor === itemCursor : false;

});

return cursorIndex >= 0

? cursorIndex === results.length - 1 // don't let us overflow

? []

: results.slice(

cursorIndex + 1,

Math.min(results.length, cursorIndex + 1 + pageSize),

)

: results.slice(0, pageSize);

};

module.exports.createStore = () => {

const db = new Sequelize({

dialect: 'sqlite',

storage: './store.sqlite'

});

const users = db.define('user', {

createdAt: Sequelize.DATE,

updatedAt: Sequelize.DATE,

email: Sequelize.STRING,

profileImage: Sequelize.STRING,

token: Sequelize.STRING,

});

const trips = db.define('trip', {

createdAt: Sequelize.DATE,

updatedAt: Sequelize.DATE,

launchId: Sequelize.INTEGER,

userId: Sequelize.INTEGER,

});

return { db, users, trips };

};