// src/excel/excel.controller.ts
import {
  Controller,
  Post,
  UploadedFile,
  UseInterceptors,
  BadRequestException,
  Request,
  Get,
  Res,
  HttpStatus,
} from '@nestjs/common';

import { FileInterceptor } from '@nestjs/platform-express';
import { ExcelService } from './excel.service';
import { ExcelDocumentation } from './excel.documentation';
import { MovimientoService } from 'src/movimiento/movimiento.service';
import { Response } from 'express';

@Controller('excel')
export class ExcelController {
  constructor(
    private readonly excelService: ExcelService,

    private readonly movimientoService: MovimientoService,
  ) {}

  @Post('verify')
  @UseInterceptors(FileInterceptor('file'))
  @ExcelDocumentation.verifyExcel()
  async verifyExcel(@UploadedFile() file: Express.Multer.File, @Request() req) {
    if (!file) throw new BadRequestException('Se requiere un archivo .xlsx');
    const userId = req.user.userId;

    const errors = await this.excelService.validateFile(file.buffer);

    await this.movimientoService.log(
      userId,
      'VERIFY',
      errors.length ? 'FAILED' : 'SUCCESS',
      errors.join('; '),
    );

    return { valid: errors.length === 0, errors };
  }

  @Post('load')
  @UseInterceptors(FileInterceptor('file'))
  @ExcelDocumentation.loadExcel()
  async loadExcel(@UploadedFile() file: Express.Multer.File, @Request() req) {
    const userId = req.user.userId;
    try {
      const { inserted } = await this.excelService.loadFile(file.buffer);
      await this.movimientoService.log(
        userId,
        'LOAD',
        'SUCCESS',
        undefined,
        `inserted=${inserted}`,
      );
      return { inserted };
    } catch (err) {
      await this.movimientoService.log(userId, 'LOAD', 'FAILED', err.message);
      throw err;
    }
  }


 @ExcelDocumentation.downloadExcel()     // <-- decorador correcto
  @Get('download')
  async downloadData(@Request() req, @Res() res: Response) {
    const userId: number = req.user.userId;  // asegúrate de que sea primitivo

    try {
      // 1) Genera los datos
      const data = await this.excelService.generateCsv();

      // 2) Log SUCCESS
      await this.movimientoService.log(
        userId,                  // <-- solo el valor, no userId()
        'DOWNLOAD',
        'SUCCESS',
        undefined,
        `size=${data.length}`,
      );

      // 3) Devuelve la respuesta
      return res
        .status(HttpStatus.OK)     // <-- HttpStatus importado
        .header('Content-Type', 'text/tab-separated-values')
        .header('Content-Disposition', 'attachment; filename="usuarios.tsv"')
        .send(data);
    } catch (err) {
      // 4) Log FAILED
      await this.movimientoService.log(
        userId,
        'DOWNLOAD',
        'FAILED',
        err.message,
      );

      // 5) Responde el error
      return res
        .status(HttpStatus.INTERNAL_SERVER_ERROR)
        .json({ statusCode: 500, message: 'Error generando descarga.' });
    }
  }
















}