import type { BaseName } from './MultiBaseEncoder'
import type { Attachment } from '../decorators/attachment/Attachment'

import { AriesFrameworkError } from '../error/AriesFrameworkError'

import { HashlinkEncoder } from './HashlinkEncoder'
import { TypedArrayEncoder } from './TypedArrayEncoder'

/**
 * Encodes an attachment based on the `data` property
 *
 * @param attachment The attachment that needs to be encoded
 * @param hashAlgorithm The hashing algorithm that is going to be used
 * @param baseName The base encoding name that is going to be used
 * @returns A hashlink based on the attachment data
 */
export function encodeAttachment(
  attachment: Attachment,
  hashAlgorithm: 'sha2-256' = 'sha2-256',
  baseName: BaseName = 'base58btc'
) {
  if (attachment.data.sha256) {
    return `hl:${attachment.data.sha256}`
  } else if (attachment.data.base64) {
    return HashlinkEncoder.encode(TypedArrayEncoder.fromBase64(attachment.data.base64), hashAlgorithm, baseName)
  } else if (attachment.data.json) {
    throw new AriesFrameworkError(
      `Attachment: (${attachment.id}) has json encoded data. This is currently not supported`
    )
  } else {
    throw new AriesFrameworkError(`Attachment: (${attachment.id}) has no data to create a link with`)
  }
}

/**
 * Checks if an attachment is a linked Attachment
 *
 * @param attachment the attachment that has to be validated
 * @returns a boolean whether the attachment is a linkedAttachment
 */
export function isLinkedAttachment(attachment: Attachment) {
  return HashlinkEncoder.isValid(`hl:${attachment.id}`)
}