import { Body, Controller, Logger, Post, Req } from '@nestjs/common';
import { PurchaseService } from '../service/purchase.service';
import { UserService } from '../service/user.service';
import { PurchaseItem } from '../dto/purchase-item';
import { StripeService } from '../service/stripe.service';
import { PurchaseStatus } from 'src/dto/purchase-status';
import { TokenService } from 'src/service/token.service';

@Controller('/buy')
export class BuyController {
  private static PURCHASE_STATUS_TO_REEVALUATE = [
    PurchaseStatus.CREATED,
    PurchaseStatus.IN_PROGRESS,
  ];
  private readonly logger = new Logger(BuyController.name);

  constructor(
    private readonly purchaseService: PurchaseService,
    private readonly userService: UserService,
    private readonly tokenService: TokenService,
    private readonly stripeService: StripeService,
  ) {}

  @Post('/start')
  public async startPurchaseFlow(
    @Req() request,
    @Body('quantity') quantity: number,
  ) {
    const userId = request.userId;
    const user = await this.userService.getUserById(userId);
    const purchase = await this.purchaseService.createPurchase(
      user,
      PurchaseItem.PAELLA,
      quantity,
    );
    const { sessionId, sessionUrl } =
      await this.stripeService.createStripeSession(purchase);
    purchase.stripeSessionId = sessionId;
    this.purchaseService.recordPurchase(purchase);
    this.logger.debug(`Redirecting to ${sessionUrl}`);
    return { url: sessionUrl };
  }

  @Post('/complete')
  public async complete(@Req() request) {
    const userId = request.userId;
    const user = await this.userService.getUserById(userId);
    const purchases = await this.purchaseService.getPurchasesForUser(user);
    purchases
      .filter((purchase) =>
        BuyController.PURCHASE_STATUS_TO_REEVALUATE.includes(purchase.status),
      )
      .forEach(async (purchase) => {
        const { isPaid } = await this.stripeService.getStripeSessionFromId(
          purchase.stripeSessionId!,
        );
        purchase.status = isPaid
          ? PurchaseStatus.COMPLETED
          : PurchaseStatus.IN_PROGRESS;
        this.purchaseService.recordPurchase(purchase);
        if (purchase.status === PurchaseStatus.COMPLETED) {
          this.tokenService.addTokens(user, purchase);
        }
      });

    return { url: '/signup' };
  }
}