const express = require('express');
const multer = require('multer');
const gcsSharp = require('multer-sharp');

const app = express();

// without resize image
const storage = gcsSharp({
    bucket: 'YOUR_BUCKET', // Required : bucket name to upload
    projectId: 'YOUR_PROJECTID', // Required : Google project ID
    keyFilename: 'YOUR_KEYFILENAME', // Optional : JSON credentials file for Google Cloud Storage
    destination: 'public/image', // Optional : destination folder to store your file on Google Cloud Storage, default: ''
    acl: 'publicRead' // Optional : acl credentials file for Google Cloud Storage, 'publicrRead' or 'private', default: 'private'
});
const upload = multer({ storage });

app.post('/upload', upload.single('myPic'), (req, res) => {
    console.log(req.file); // Print upload details
    res.send('Successfully uploaded!');
});

// or

// simple resize with custom filename
const storage2 = gcsSharp({
  filename: (req, file, cb) => {
      cb(null, `${file.fieldname}-newFilename`);
  },
  bucket: 'YOUR_BUCKET', // Required : bucket name to upload
  projectId: 'YOUR_PROJECTID', // Required : Google project ID
  keyFilename: 'YOUR_KEYFILENAME', // Optional : JSON credentials file for Google Cloud Storage
  acl: 'publicRead', // Optional : acl credentials file for Google Cloud Storage, 'publicrRead' or 'private', default: 'private'
  size: {
    width: 400,
    height: 400
  },
  max: true
});
const upload2 = multer({ storage: storage2 });

app.post('/uploadwithfilename', upload2.single('myPic'), (req, res, next) => {
    console.log(req.file); // Print upload details
    res.send('Successfully uploaded!');
});

/* If you need generate image with specific size
 * simply to adding `sizes` property
 * sizes must be an `array` and must be specify
 * with suffix, width / height property
 */
const storage = multerSharp({
  bucket: config.uploads.gcsUpload.bucket,
  projectId: config.uploads.gcsUpload.projectId,
  keyFilename: config.uploads.gcsUpload.keyFilename,
  acl: config.uploads.gcsUpload.acl,
  sizes: [
    { suffix: 'xlg', width: 1200, height: 1200 },
    { suffix: 'lg', width: 800, height: 800 },
    { suffix: 'md', width: 500, height: 500 },
    { suffix: 'sm', width: 300, height: 300 },
    { suffix: 'xs', width: 100 }
  ],
  max: true
});
const upload = multer({ storage });

app.post('/uploadmultiplesize', upload.single('myPic'), (req, res, next) => {
    console.log(req.file);
    /*
    * will print like this
    {
      originalname: 'nodejs-512.png',
      encoding: '7bit',
      mimetype: 'image/png',
      md: {
        path: 'https://storage.googleapis.com/multer-sharp.appspot.com/cd2105f5d60684a9f7c9fd2c340befed-md',
        filename: 'cd2105f5d60684a9f7c9fd2c340befed-md'
      },
      sm: {
        path: 'https://storage.googleapis.com/multer-sharp.appspot.com/cd2105f5d60684a9f7c9fd2c340befed-sm',
        filename: 'cd2105f5d60684a9f7c9fd2c340befed-sm'
      },
      xs: {
        path: 'https://storage.googleapis.com/multer-sharp.appspot.com/cd2105f5d60684a9f7c9fd2c340befed-xs',
        filename: 'cd2105f5d60684a9f7c9fd2c340befed-xs'
      }
    }
    */
    res.send('Successfully uploaded!');
});

const storage = gcsSharp(options);