// Api request lib
import fetch, { FetchError, Headers } from "node-fetch";
import { URL, URLSearchParams } from "url";

namespace PeerTubeRequester {
  export type Config = {
    domain_name: string | URL;
    username: string;
    password: string;
  };
}

type UploadInstruction = {
  [key: string]: string;
  channelId: string;
  targetUrl: string;
};

class PeerTubeRequester {
  readonly domain_name: URL;
  readonly username: string;
  readonly password: string;

  constructor(readonly config: PeerTubeRequester.Config) {
    this.domain_name = new URL("/", config.domain_name);
    this.username = config.username;
    this.password = config.password;
  }

  private async requestAuthToken(): Promise<any> {
    let response = await fetch(
      new URL(`/api/v1/oauth-clients/local`, this.domain_name)
    );
    if (!response.ok) {
      throw new Error(response.statusText); // CRASH
    }
    const { client_id, client_secret } = await response.json();

    const client_info: { [key: string]: string } = {
      client_id,
      client_secret,
      grant_type: "password",
      response_type: "code",
      username: this.username,
      password: this.password,
    };

    let myParams = new URLSearchParams();
    for (const key in client_info) myParams.append(key, client_info[key]);

    response = await fetch(new URL(`/api/v1/users/token`, this.domain_name), {
      method: "post",
      body: myParams,
    });
    if (!response.ok) {
      throw new Error(response.statusText); // CRASH
    }
    const { access_token: accessToken } = await response.json();
    return accessToken;
  }

  async uploadFromUrl(message: UploadInstruction): Promise<void> {
    const accessToken = await this.requestAuthToken();
    const myUploadForm = new URLSearchParams();
    const myHeader = new Headers();
    myHeader.append("Authorization", `Bearer ${accessToken}`);
    for (const key in message) myUploadForm.append(key, message[key]);

    const response = await fetch(
      new URL(`/api/v1/videos/imports`, this.domain_name),
      {
        method: "post",
        headers: myHeader,
        body: myUploadForm,
      }
    );

    if (!response.ok) {
      switch (response.status) {
        case 400:
          throw new Error(
            `Bad or malformed request. Probably because your target URL (from Youtube?) was not accepted by the API.\
                        The target URL you attempted to pass: ${message.targetUrl}.
                        Response from the server: ${response.statusText}`
          );
          break;
        case 403:
          throw new Error(response.statusText);
          break;
        case 409:
          throw new Error(
            `Oops, your instance did not allowed the HTTPS import.\
                        Contact your administrator.
                        ${response.statusText}`
          );
          break;
        default:
          throw new Error(
            `Oh, you encountered an undocumented issues.\
                        Please create an issue to the plugin project.
                        ERROR: ${response.statusText}`
          );
          break;
      }
    }
  }
}

export { PeerTubeRequester };