import { createHash } from 'crypto'

export interface RequestParams {
  [x: string]: string
}

export interface RequestOptions {
  url: string
  method: string
  friendlyName: string
  params: RequestParams
}

/**
 * COntains all data used by custom facebook http logic.
 */
export default class HttpApiRequest {
  url: string
  method: string
  friendlyName: string
  params: RequestParams

  constructor (options: RequestOptions) {
    this.url = options.url
    this.method = options.method
    this.friendlyName = options.friendlyName
    this.params = options.params
  }

  get sortedKeys () {
    const keys = Object.keys(this.params)
    keys.sort()
    return keys
  }

  serializeParams () {
    return this.sortedKeys
            .map(
                k =>
                    encodeURIComponent(k) +
                    '=' +
                    encodeURIComponent(this.params[k])
            )
            .join('&')
  }

  sign () {
    let data = this.sortedKeys
            .map(k => k + '=' + this.params[k])
            .join('') // This isn't the same as request.serializeParams(), because no & sign and no escaping. Thanks ZUCC
    data += '374e60f8b9bb6b8cbb30f78030438895' // api secret
    this.params.sig = createHash('md5')
            .update(data)
            .digest('hex')
  }
}