import { getMetaValue } from “./helpers”

export class BlobRecord {

constructor(file, checksum, url) {
  this.file = file

  this.attributes = {
    filename: file.name,
    content_type: file.type,
    byte_size: file.size,
    checksum: checksum
  }

  this.xhr = new XMLHttpRequest
  this.xhr.open("POST", url, true)
  this.xhr.responseType = "json"
  this.xhr.setRequestHeader("Content-Type", "application/json")
  this.xhr.setRequestHeader("Accept", "application/json")
  this.xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest")
  this.xhr.setRequestHeader("X-CSRF-Token", getMetaValue("csrf-token"))
  this.xhr.addEventListener("load", event => this.requestDidLoad(event))
  this.xhr.addEventListener("error", event => this.requestDidError(event))
}

create(callback) {
  this.callback = callback
  this.xhr.send(JSON.stringify({ blob: this.attributes }))
}

requestDidLoad(event) {
  const { status, response } = this.xhr
  if (status >= 200 && status < 300) {
    const { direct_upload } = response
    delete response.direct_upload
    this.attributes = response
    this.directUploadData = direct_upload
    this.callback(null, this.toJSON())
  } else {
    this.requestDidError(event)
  }
}

requestDidError(event) {
  this.callback(`Error creating Blob for "${this.file.name}". Status: ${this.xhr.status}`)
}

toJSON() {
  const result = {}
  for (const key in this.attributes) {
    result[key] = this.attributes[key]
  }
  return result
}

}