import {BeforeInsert, Entity, ManyToOne, PrimaryColumn} from 'typeorm';

import {Node} from '$lib/server/entity/Node';
import {ulidMonotonic} from '$lib/server/ulid';

@Entity()
export class Edge {
	@PrimaryColumn({type: 'varchar', length: 26})
	id = ulidMonotonic();

	@ManyToOne(() => Node, node => node.outgoingEdges, {
		nullable: false,
		cascade: true,
		onDelete: 'CASCADE',
	})
	head!: Node;

	@ManyToOne(() => Node, node => node.incomingEdges, {
		nullable: false,
		cascade: true,
		onDelete: 'CASCADE',
	})
	tail!: Node;

	@BeforeInsert()
	beforeInsert () {
		this.id = ulidMonotonic();
	}
}