import ConversionParameters from './conversion-parameters'
import Parameters, { StorageOptions } from './parameters'

type Optional<T> = T|null|undefined

export default class MergeParameters implements Parameters {
  private documents: ConversionParameters[] = []
  private params: { [key: string]: any } = {}

  /**
   * Add a document to the PDF.
   */
  addDocument(document: ConversionParameters) {
    this.documents.push(document)
    return this
  }

  /**
   * Add multiple documents to the PDF.
   */
  addDocuments(documents: ConversionParameters[]) {
    this.documents.push(...documents)
    return this
  }

  /**
   * Secure the PDF with an owner password.
   */
  ownerPassword(password: Optional<string>) {
    this.params.ownerPassword = password
    return this
  }

  /**
   * Secure the PDF with a user password.
   */
  userPassword(password: Optional<string>) {
    this.params.userPassword = password
    return this
  }

  /**
   * Secure the PDF with an owner and a user password.
   */
  passwords(owner: Optional<string>, user: Optional<string>) {
    return this.ownerPassword(owner).userPassword(user)
  }

  /**
   * Serve the PDF via the CDN.
   */
  cdn(cdn: Optional<boolean> = true) {
    this.params.cdn = cdn
    return this
  }

  /**
   * Upload the PDF directly to the user's configured storage disk.
   */
  storage(options?: Partial<StorageOptions>|boolean) {
    this.params.storage = options ? options : true
    return this
  }

  all() {
    return {
      documents: this.documents.map(doc => doc.all()),
      ...this.params,
    } as { [key: string]: any }
  }
}