import { Router } from "express";
import path from 'path';
import multer from 'multer';
import fs from 'fs/promises';
import sharp from 'sharp';
import crypto from 'crypto';
import { fileTypeFromBuffer } from 'file-type';
import { createNewOffer, getOfferById, deleteOffer, getAllOffers, getOffersByUserId, editOffer } from "../functions/offerFunctions.js";
const router = Router();

const storage = multer.memoryStorage();

const fileFilter = (req, file, cb) => {
  if (file.mimetype.startsWith('image/')) {
    cb(null, true);
  } else {
    cb(new Error('Solo se permiten imágenes'), false);
  }
};

const upload = multer({
  storage: storage,
  fileFilter: fileFilter,
  limits: {
    fileSize: 5 * 1024 * 1024 // 5MB limit
  }
});

async function processImage(file) {
    const imagePath = path.join(process.cwd(), 'uploads');

    const buffer = file.buffer;
    const hash = crypto.createHash('sha256').update(buffer).digest('hex');
    const mime = await fileTypeFromBuffer(buffer).then(type => type?.mime);
    
    // Validate MIME type
    if (!mime || !['image/jpeg', 'image/png', 'image/gif', 'image/webp'].includes(mime)) {
        throw new Error('Unsupported image format');
    }

    // File save name and path if not GIF
    let filename;
    if (mime === 'image/gif') {
        filename = `${hash}.gif`;
        await fs.writeFile(path.join(imagePath, filename), buffer);
    } else {
        filename = `${hash}.webp`;
        await sharp(buffer)
            .resize({ width: 800, height: 800, fit: 'inside', withoutEnlargement: true })
            .rotate()
            .normalise()
            .withMetadata()
            .toFormat('webp', { quality: 80 })
            .toFile(path.join(imagePath, filename));
    }
    return filename;
}

const processUploadedImage = async (req, res, next) => {
    try {
        if (req.file) {
            const filename = await processImage(req.file);
            req.processedFilename = filename;
        }
        next();
    } catch (error) {
        console.error('Error processing image:', error);
        res.status(400).json({ error: 'Error al procesar la imagen: ' + error.message });
    }
};


// Validate create offer payload
const validateOfferPayload = (req, res, next) => {
    const { nombre, descripcion, precio, id_usuario } = req.body;
    if (!nombre || !descripcion || !precio || !id_usuario) {
        return res.status(400).json({ error: 'nombre, descripcion, precio and id_usuario are required' });
    }
    next();
};

router.post('/', upload.single('imagen'), validateOfferPayload, processUploadedImage, createNewOffer);
router.get('/', getAllOffers);
router.get('/:id_oferta', getOfferById);
router.put('/:id_oferta', upload.single('imagen'), validateOfferPayload, processUploadedImage, editOffer);
router.delete('/:id_oferta', deleteOffer);
router.get('/user/:id_usuario', getOffersByUserId);

export default router;