import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, JoinTable } from 'typeorm'
import { User } from './User'

@Entity("links")
export class Link {

	// Unique link id.
	@PrimaryGeneratedColumn()
	id: number;

	// Experimental: subdomain which should be a part of the short url.
	// For instance in the URL "abc.example.com/def", abc is the subdomain.
	// "def.example.com/def" won't resolve to the URL that "abc.example.com/def" does.
	// https://stackoverflow.com/a/67535817
	@Column({ type: 'varchar', nullable: true })
	subdomain: string | null;

	// Shortened Uri.
	@Column()
	shortUri: string;

	// URL to which the user should be redirected
	@Column()
	fullUrl: string;

	// Unix timestamp of link creation date.
	@Column('bigint')
	createDate: number;

	// Unix timestamp of when the link should expire.
	// If null, the link will never expire unless deleted.
	@Column('bigint', { nullable: true })
	expiryDate: number | null;

	// Aggregated amount of visits.
	@Column('bigint')
	visits: number;

	// Link privacy:
	// - true, if link is private
	// - false, if link can be shown in a list of recent links publicly.
	@Column()
	privacy: boolean;

	// User to which the shortened URL belongs.
	@ManyToOne(() => User, (user) => user.links, { nullable: true })
	@JoinTable()
	author: User | null;
}