import {
  Controller,
  Post,
  Headers,
  Req,
  HttpCode,
  HttpStatus,
  BadRequestException,
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiExcludeEndpoint } from '@nestjs/swagger';
import { Request } from 'express';
import { PaymentsService } from './payments.service';
import { StripeService } from './stripe.service';

@ApiTags('webhooks')
@Controller('webhooks')
export class WebhooksController {
  constructor(
    private paymentsService: PaymentsService,
    private stripeService: StripeService
  ) {}

  @Post('stripe')
  @HttpCode(HttpStatus.OK)
  @ApiExcludeEndpoint()
  @ApiOperation({ summary: 'Handle Stripe webhooks' })
  async handleStripeWebhook(
    @Req() req: Request,
    @Headers('stripe-signature') signature: string
  ) {
    if (!signature) {
      throw new BadRequestException('Missing stripe-signature header');
    }

    let event;

    try {
      // req.body should be raw buffer for webhook verification
      const rawBody = (req as Request & { rawBody?: Buffer }).rawBody;
      if (!rawBody) {
        throw new BadRequestException('Missing raw body');
      }
      event = this.stripeService.constructWebhookEvent(rawBody, signature);
    } catch (err) {
      throw new BadRequestException(`Webhook signature verification failed: ${err}`);
    }

    await this.paymentsService.handleWebhookEvent(event);

    return { received: true };
  }
}