import {
  BadRequestException,
  Body,
  Controller,
  HttpCode,
  Post,
  UploadedFile,
  UseInterceptors,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { memoryStorage } from 'multer';
import { ParseFlyerDto } from './dto/parse-flyer.dto';
import { FlyerParseResponse, FlyerParsingService } from './flyer-parsing.service';

const ALLOWED_UPLOAD_MIMES = new Set([
  'application/pdf',
  'application/octet-stream',
  'text/plain',
]);

@Controller('flyer')
export class FlyerParsingController {
  constructor(private readonly flyerParsingService: FlyerParsingService) {}

  @Post('parse')
  @HttpCode(200)
  @UseInterceptors(
    FileInterceptor('file', {
      storage: memoryStorage(),
      limits: { fileSize: 15 * 1024 * 1024 },
      fileFilter: (_req, file, cb) => {
        if (ALLOWED_UPLOAD_MIMES.has(file.mimetype)) {
          cb(null, true);
          return;
        }
        cb(
          new BadRequestException('Otillåten filtyp för flyer-parser. Stöd: PDF eller textfil.'),
          false,
        );
      },
    }),
  )
  async parseFlyer(
    @Body() body: ParseFlyerDto,
    @UploadedFile() file?: Express.Multer.File,
  ): Promise<FlyerParseResponse> {
    if (!file && !body?.text?.trim()) {
      throw new BadRequestException('Skicka antingen fil under "file" eller text i body.text.');
    }

    const text = body?.text?.trim();
    return this.flyerParsingService.parseFlyer({
      file,
      text,
      retailer: body?.retailer ?? 'willys',
    });
  }
}