import firebase from "../lib/firebase"

type ResponseType = "text" | "blob"

interface RequestOptions extends RequestInit {
  requireJSON?: boolean
}

export default (firebase: any, log = console.log) => { // TODO: assign firebase type
  const token = async () => {
    return firebase.auth().currentUser?.getIdToken()
  }

  async function doRequest<T>(
    url: string,
    options?: RequestOptions,
    responseType?: ResponseType
  ): Promise<T>

  async function doRequest(
    url: string,
    options?: RequestOptions,
    responseType?: ResponseType
  ): Promise<string>

  async function doRequest<T>(
    url: string,
    options?: RequestOptions,
    responseType = "text"
  ) {
    log("request: fetching", url)

    const headers = new Headers()
    headers.append("Authorization", `Bearer ${await token()}`)
    headers.append("Content-Type", "application/json; charset=utf-8")

    let response
    try {
      response = await fetch(url, { headers, ...options, mode: 'cors' })
    } catch (err) {
      log("request: network error making request", err)
      throw err
    }
    const result = await parseResponse<T>(
      response,
      options?.requireJSON,
      responseType as ResponseType
    )
    log("request: result", result)
    return result
  }

  async function parseResponse<T>(
    res: Response,
    requireJSON?: boolean,
    responseType?: ResponseType
  ): Promise<T>
  async function parseResponse(
    res: Response,
    requireJSON?: boolean,
    responseType?: ResponseType
  ): Promise<string>

  async function parseResponse(
    res: Response,
    requireJSON?: boolean,
    responseType?: ResponseType
  ) {
    const text = await res[responseType as ResponseType]()
    log("response status: ", res.status, text)
    if (res.status >= 300) {
      throw new Error(`${res.status} ${text}`)
    }
    try {
      return JSON.parse(text as string)
    } catch (e) {
      if (requireJSON) {
        throw new Error(`${text}`)
      }
    }
    return text
  }
  return {
    token,
    doRequest,
    parseResponse
  }
}