/**

 * Set the topic of a Matrix room. A topic is a short message detailing what is currently being discussed in the room.

 *

 * HTTP endpoint: https://spec.matrix.org/v1.5/client-server-api/#put_matrixclientv3roomsroomidstateeventtypestatekey

 *

 * State event description: https://spec.matrix.org/v1.5/client-server-api/#mroomtopic

 */

type Matrix = {

  baseUrl: string;

  token: string;

};

export async function main(

  matrix_res: Matrix,

  room_id: string,

  topic: string = "",

) {

  const url = `${

    matrix_res.baseUrl

  }/_matrix/client/v3/rooms/${encodeURIComponent(room_id)}/state/m.room.topic/`;

  const resp = await fetch(url, {

    method: "PUT",

    headers: {

      Authorization: `Bearer ${matrix_res.token}`,

      "Content-Type": "application/json",

    },

    body: JSON.stringify({

      topic,

    }),

  });

  if (!resp.ok) {

    throw Error(`Failed to set room topic: Error HTTP${resp.status}`);

  }

  return await resp.json();

}