import { IsInt, IsPositive } from 'class-validator';
import { getConnection } from 'typeorm';
import { RunnerNotFoundError } from '../../../errors/RunnerErrors';
import { DistanceDonation } from '../../entities/DistanceDonation';
import { Runner } from '../../entities/Runner';
import { UpdateDonation } from './UpdateDonation';

/**
 * This class is used to update a DistanceDonation entity (via put request).
 */
export class UpdateDistanceDonation extends UpdateDonation {

    /**
     * The donation's associated runner's id.
     * This is important to link the runner's distance ran to the donation.
     */
    @IsInt()
    @IsPositive()
    runner: number;

    /**
     * The donation's amount per distance (full kilometer aka 1000 meters).
     * The unit is your currency's smallest unit (default: euro cent).
     */
    @IsInt()
    @IsPositive()
    amountPerDistance: number;

    /**
     * Update a DistanceDonation entity based on this.
     * @param donation The donation that shall be updated.
     */
    public async update(donation: DistanceDonation): Promise<DistanceDonation> {
        donation.amountPerDistance = this.amountPerDistance;
        donation.donor = await this.getDonor();
        donation.runner = await this.getRunner();

        return donation;
    }

    /**
     * Gets a runner based on the runner id provided via this.runner.
     */
    public async getRunner(): Promise<Runner> {
        const runner = await getConnection().getRepository(Runner).findOne({ id: this.runner });
        if (!runner) {
            throw new RunnerNotFoundError();
        }
        return runner;
    }
}