import fs from 'node:fs';
import path from 'node:path';
import crypto from 'node:crypto';
import multer from 'multer';
import { env } from '../config/env.js';

const ALLOWED_MIME = new Set(['image/png', 'image/jpeg', 'image/webp', 'image/svg+xml']);

export const logoDir = path.join(env.storageRoot, 'branding');
fs.mkdirSync(logoDir, { recursive: true });

const storage = multer.diskStorage({
  destination: (req, file, cb) => cb(null, logoDir),
  // Nombre generado por el servidor (evita colisiones/path traversal) y sirve de version para
  // el cache-busting del logo publico (cambia en cada subida).
  filename: (req, file, cb) => {
    const ext = path.extname(file.originalname).slice(0, 10);
    cb(null, `logo-${Date.now()}-${crypto.randomBytes(6).toString('hex')}${ext}`);
  },
});

export const uploadLogo = multer({
  storage,
  limits: { fileSize: 3 * 1024 * 1024 },
  fileFilter: (req, file, cb) => {
    if (!ALLOWED_MIME.has(file.mimetype)) {
      return cb(new Error('Tipo de archivo no permitido (usa PNG, JPG, WEBP o SVG)'));
    }
    cb(null, true);
  },
});