import {
  IsDateString,
  IsInt,
  IsNotEmpty,

  IsPositive
} from "class-validator";
import { ChildEntity, Column, ManyToOne } from "typeorm";
import { RunnerCard } from "./RunnerCard";
import { Scan } from "./Scan";
import { ScanStation } from "./ScanStation";
import { Track } from "./Track";

/**
 * Defines the TrackScan entity.
 * A track scan usaually get's generated by a scan station.
*/
@ChildEntity()
export class TrackScan extends Scan {
  /**
   * The scan's associated track.
   * This is used to determine the scan's distance.
   */
  @IsNotEmpty()
  @ManyToOne(() => Track, track => track.scans, { nullable: true })
  track: Track;

  /**
   * The runnerCard associated with the scan.
   * This get's saved for documentation and management purposes.
   */
  @IsNotEmpty()
  @ManyToOne(() => RunnerCard, card => card.scans, { nullable: true })
  card: RunnerCard;

  /**
   * The scanning station that created the scan.
   * Mainly used for logging and traceing back scans (or errors)
   */
  @IsNotEmpty()
  @ManyToOne(() => ScanStation, station => station.scans, { nullable: true })
  station: ScanStation;

  /**
   * The scan's distance in meters.
   * This just get's loaded from it's track.
   */
  @IsInt()
  @IsPositive()
  public get distance(): number {
    return this.track.distance;
  }

  /**
   * The scan's creation timestamp.
   * Will be used to implement fraud detection.
   */
  @Column()
  @IsDateString()
  @IsNotEmpty()
  timestamp: string;
}