//native

type Ably = {

  apiKey: string;

};

/**

 * List all channels with at least one subscribed device

 * Returns a paginated response of channel names.

 */

export async function main(

  auth: Ably,

  format: "json" | "jsonp" | "msgpack" | "html" | undefined,

  X_Ably_Version: string,

) {

  const url = new URL(`https://rest.ably.io/push/channels`);

  for (const [k, v] of [["format", format]]) {

    if (v !== undefined && v !== "" && k !== undefined) {

      url.searchParams.append(k, v);

    }

  }

  const response = await fetch(url, {

    method: "GET",

    headers: {

      "X-Ably-Version": X_Ably_Version,

      Authorization: "Bearer " + auth.apiKey,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`${response.status} ${text}`);

  }

  return await response.json();

}