const axios = require("axios")

// Data we need to make the Twitter API request
const oauthSignerUri = auths.twitter.oauth_signer_uri
const token = {
  key: auths.twitter.oauth_access_token,
  secret: auths.twitter.oauth_refresh_token,
}
const signConfig = {
  token,
  oauthSignerUri
}

// Download image, base64 encode it, then upload the media to Twitter
const imageResponse = await axios({
  url: params.url,
  method: "GET",
  responseType: "arraybuffer"
})

const file = Buffer.from(imageResponse.data, 'binary')
const total_bytes = file.length
const base64EncodedFile = file.toString('base64')
const { media_type } = params

// First, tell Twitter the type of file you're uploading, how big it is, etc.
// https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-init
const mediaUploadInitRequest = {
  method: 'POST',
  data: '',
  url: "https://upload.twitter.com/1.1/media/upload.json",
  params: {
    command: "INIT",
    total_bytes,
    media_type,
  }
}

// Twitter returns a media_id_string that we use to upload the file,
// and to reference it in future steps
this.uploadMediaInitResponse = (await require("@pipedreamhq/platform").axios(this, mediaUploadInitRequest, signConfig))
this.mediaIdString = this.uploadMediaInitResponse.media_id_string 

// Split the file into chunks, APPEND each chunk
const splitStringRe = new RegExp('.{1,' + 1000 + '}', 'g');
const chunks = base64EncodedFile.match(splitStringRe);

for (const [segment_index, media_data] of chunks.entries()) {
  console.log(`Processing chunk ${segment_index}`)
  // APPEND file content in chunks
  // See https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-append
  const mediaUploadAppendRequest = {
    method: 'POST',
    data: '',
    url: "https://upload.twitter.com/1.1/media/upload.json",
    params: {
      command: "APPEND",
      media_id: this.mediaIdString,
      segment_index,
      media_data,
    }
  }
  await require("@pipedreamhq/platform").axios(this, mediaUploadAppendRequest, signConfig)
}

// Finally, tell Twitter we're done uploading
// https://developer.twitter.com/en/docs/media/upload-media/api-reference/post-media-upload-finalize
const mediaUploadFinalizeRequest = {
    method: 'POST',
    data: '',
    url: "https://upload.twitter.com/1.1/media/upload.json",
    params: {
      command: "FINALIZE",
      media_id: this.mediaIdString,
    }
  }
  await require("@pipedreamhq/platform").axios(this, mediaUploadFinalizeRequest, signConfig)