import {
  BadRequestException,
  Controller,
  HttpCode,
  Post,
  Request,
  UnauthorizedException,
  UploadedFile,
  UseInterceptors,
} from '@nestjs/common';
import { Throttle } from '@nestjs/throttler';
import { FileInterceptor } from '@nestjs/platform-express';
import { memoryStorage } from 'multer';
import { FlyerImportResponse } from './dto/flyer-import.response';
import { FlyerImportService } from './flyer-import.service';

const ALLOWED_MIMES = [
  'application/pdf',
  'application/octet-stream',
  'text/plain',
];

@Controller('flyer-import')
export class FlyerImportController {
  constructor(private readonly flyerImportService: FlyerImportService) {}

  @Post('parse')
  @HttpCode(200)
  @Throttle({ default: { ttl: 60_000, limit: 10 } })
  @UseInterceptors(
    FileInterceptor('file', {
      storage: memoryStorage(),
      limits: { fileSize: 15 * 1024 * 1024 },
    }),
  )
  async parseFlyer(
    @UploadedFile() file?: Express.Multer.File,
    @Request() req?: any,
  ): Promise<FlyerImportResponse> {
    if (!file?.buffer) {
      throw new BadRequestException('Ingen fil skickades med.');
    }
    if (!ALLOWED_MIMES.includes(file.mimetype)) {
      throw new BadRequestException('Otillåten filtyp. Använd PDF eller textfil.');
    }

    const userId =
      typeof req?.user?.id === 'number'
        ? req.user.id
        : typeof req?.user?.userId === 'number'
          ? req.user.userId
          : undefined;

    if (!userId) {
      throw new UnauthorizedException('Kunde inte identifiera användaren.');
    }

    return this.flyerImportService.parseAndMatch(file, userId);
  }
}