import {
  IsInt,
  IsNotEmpty,

  IsPositive,
  IsString
} from "class-validator";
import { Column, Entity, OneToMany, PrimaryGeneratedColumn } from "typeorm";
import { ScanStation } from "./ScanStation";
import { TrackScan } from "./TrackScan";

/**
 * Defines a track of given length.
*/
@Entity()
export class Track {
  /**
   * Autogenerated unique id (primary key).
   */
  @PrimaryGeneratedColumn()
  @IsInt()
  id: number;;

  /**
   * The track's name.
   */
  @Column()
  @IsString()
  @IsNotEmpty()
  name: string;

  /**
   * The track's length/distance in meters.
   */
  @Column()
  @IsInt()
  @IsPositive()
  distance: number;

  /**
   * Used to link scan stations to track.
   */
  @OneToMany(() => ScanStation, station => station.track, { nullable: true })
  stations: ScanStation[];

  /**
   * Used to link track scans to a track.
   */
  @OneToMany(() => TrackScan, scan => scan.track, { nullable: true })
  scans: TrackScan[];
}