import { Entity, Column, ManyToOne } from "typeorm";
import { IsInt, IsNotEmpty, IsPositive,} from "class-validator";
import { Donation } from "./Donation";
import { Runner } from "./Runner";

/**
 * Defines a distance based donation.
 * Here people donate a certain amout per kilometer
*/
@Entity()
export class DistanceDonation extends Donation {
  /**
   * The runner associated.
   */
  @Column()
  @IsNotEmpty()
  @ManyToOne(() => Runner, runner => runner.distanceDonations)
  runner: Runner;

  /**
   * The amount the donor set to be donated per kilometer that the runner ran.
   */
  @Column()
  @IsInt()
  @IsPositive()
  amountPerDistance: number;

  /**
   * The donation's amount in cents (or whatever your currency's smallest unit is.).
   * The exact implementation may differ for each type of donation.
   */
  @IsInt()
  public get amount(): number {
    let calculatedAmount = -1;
    try {
      calculatedAmount = this.amountPerDistance * this.runner.getDistance();
    } catch (error) {
      throw error;
    }
    return calculatedAmount;
  }
}