import { StreamState } from "index";
import { StreamProvider, StreamProviderInfo, StreamProviders } from "providers";

export class OwncastProvider implements StreamProvider {
  #url: string;
  #token: string;

  constructor(url: string, token: string) {
    this.#url = url;
    this.#token = token;
  }

  get name() {
    return new URL(this.#url).host;
  }

  get type() {
    return StreamProviders.Owncast;
  }

  createConfig() {
    return {
      type: StreamProviders.Owncast,
      url: this.#url,
      token: this.#token,
    };
  }

  updateStreamInfo(): Promise<void> {
    return Promise.resolve();
  }

  async info() {
    const info = await this.#getJson<ConfigResponse>("GET", "/api/config");
    const status = await this.#getJson<StatusResponse>("GET", "/api/status");
    return {
      type: StreamProviders.Owncast,
      name: info.name,
      summary: info.summary,
      version: info.version,
      state: status.online ? StreamState.Live : StreamState.Ended,
      viewers: status.viewerCount,
      endpoints: [],
    } as StreamProviderInfo;
  }

  topup(): Promise<string> {
    throw new Error("Method not implemented.");
  }

  acceptTos(): Promise<void> {
    throw new Error("Method not implemented.");
  }
  
  async #getJson<T>(
    method: "GET" | "POST",
    path: string,
    body?: unknown
  ): Promise<T> {
    const rsp = await fetch(`${this.#url}${path}`, {
      method: method,
      body: body ? JSON.stringify(body) : undefined,
      headers: {
        "content-type": "application/json",
        authorization: `Bearer ${this.#token}`,
      },
    });
    const json = await rsp.text();
    if (!rsp.ok) {
      throw new Error(json);
    }
    return JSON.parse(json) as T;
  }
}

interface ConfigResponse {
  name?: string;
  summary?: string;
  logo?: string;
  tags?: Array<string>;
  version?: string;
}

interface StatusResponse {
  lastConnectTime?: string;
  lastDisconnectTime?: string;
  online: boolean;
  overallMaxViewerCount: number;
  sessionMaxViewerCount: number;
  viewerCount: number;
}