/**
 * trial.controller.ts
 * Copyright (C) 2021 Sanar
 *
 * @author Edgard Leal <edgard.leal@sanar.com>
 * @module trial.controller.ts
 */
import { Request, Response } from 'express';
import httpStatus from 'http-status';
import { validationResult } from 'express-validator';
import { BaseController } from './base.controller';
import { SanarLinkService } from '../services/sanarlink/sanarlink.service';
import { SubscriptionsService } from '../services/subscriptions.service';

export class TrialController extends BaseController {
  static instance: TrialController;

  private linkService: SanarLinkService;

  private subscriptionService: SubscriptionsService;

  constructor() {
    super();
    this.linkService = SanarLinkService.getInstance();
    this.subscriptionService = SubscriptionsService.getInstance();
  }

  handleTGTCoupomUsageError(error: Error): number {
    console.log('Error quering TGT Coupom usage: %s', error.message); // eslint-disable-line
    return 0;
  }

  protected getTGTCoupomUsage(userId: string): Promise<number> {
    const filter = {
      where: {
        platform: 'resmed',
        gateway_id: 'RESMED',
        metadata: {
          origin: `tgt-${userId}`,
        },
      },
    };
    return this.subscriptionService.findSubscriptions(filter)
      .then((list: any[] = []): number => list.length)
      .catch(this.handleTGTCoupomUsageError);
  }

  async createSharableLink(req: Request, res: Response) {
    const errors = validationResult(req);
    if (!errors.isEmpty()) {
      res.status(httpStatus.BAD_REQUEST).json({ errors: errors.array() });
    } else {
      const [link, usage] = await Promise.all([
        this.linkService.upsertLink(req.body),
        this.getTGTCoupomUsage(req.body.user_id),
      ]);
      res.json({
        link,
        usage,
      });
    }
  }

  public static getInstance() {
    if (!TrialController.instance) {
      TrialController.instance = new TrialController();
    }
    return TrialController.instance;
  }
}