const { ServiceProvider } = require('@adonisjs/fold')
const path = require('path')
const fs = require('fs')
const Drive = use('Drive')
const Helpers = use('Helpers')

class FileUpload extends ServiceProvider {
  register () { }

  boot () { }

  static async uploadToS3 (file, folder, oldPath) {
    // If oldPath parameter is set then, delete the old picture
    if (oldPath) {
      const exists = await Drive.disk('s3').exists(oldPath)
      if (exists) {
        await Drive.disk('s3').delete(oldPath)
      }
    }

    // Create a random name for file
    const randomName = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15)
    const fileName = `${randomName}_${Date.now()}.${file.subtype}`

    // Sets the path and move the file
    const filePath = `${path.resolve(`./tmp/${folder}/`)}/${fileName}`
    await file.move(Helpers.tmpPath(folder), { name: fileName, overwrite: true })

    // Creates a readable stream from file and stores its size
    const fileStream = await fs.createReadStream(filePath)
    const fileSize = await file.stream.byteCount

    // Uploads the file to Amazon S3 and stores the url
    const s3Path = `${folder}/${fileName}`
    await Drive.disk('s3').put(s3Path, fileStream, { ACL: 'public-read', ContentType: `${file.type}/${file.subtype}` })
    const fileUrl = await Drive.disk('s3').getUrl(s3Path)

    // Destroy the readable stream and delete the file from tmp path
    await fileStream._destroy()
    await Drive.delete(filePath)

    return {
      name: fileName,
      path: s3Path,
      size: fileSize,
      url: fileUrl
    }
  }
}

module.exports = FileUpload