// @pdsjs/core/handlers/xrpc-preferences - app.bsky.actor.*Preferences.
//
// The server keeps the preferences array as the client sends it. Its contents
// are the AppView's concern, not this one's.

/**
 * @typedef {Object} PreferencesContext
 * @property {import('../ports.js').ActorStoragePort} actorStorage
 * @property {boolean} readOnly
 * @property {() => Response} readOnlyError
 */

/**
 * @param {PreferencesContext} ctx
 * @returns {{ routes: import('../pds.js').Routes }}
 */
export function createPreferencesHandlers(ctx) {
  const { actorStorage, readOnly, readOnlyError } = ctx;

  /**
   * app.bsky.actor.getPreferences
   * @param {Request} _request
   * @param {URL} _url
   * @param {import('../pds.js').Auth|null} auth
   * @returns {Promise<Response>}
   */
  async function handleGetPreferences(_request, _url, auth) {
    if (!auth) {
      return Response.json(
        { error: 'AuthenticationRequired', message: 'Authentication required' },
        { status: 401 },
      );
    }

    const preferences = await actorStorage.getPreferences();
    return Response.json({ preferences });
  }

  /**
   * app.bsky.actor.putPreferences
   * @param {Request} request
   * @param {URL} _url
   * @param {import('../pds.js').Auth|null} auth
   * @returns {Promise<Response>}
   */
  async function handlePutPreferences(request, _url, auth) {
    if (readOnly) return readOnlyError();

    if (!auth) {
      return Response.json(
        { error: 'AuthenticationRequired', message: 'Authentication required' },
        { status: 401 },
      );
    }

    const { preferences } = await request.json();
    if (!Array.isArray(preferences)) {
      return Response.json(
        { error: 'InvalidRequest', message: 'preferences must be an array' },
        { status: 400 },
      );
    }

    await actorStorage.setPreferences(preferences);
    return Response.json({});
  }

  return {
    routes: {
      '/xrpc/app.bsky.actor.getPreferences': {
        auth: 'required',
        handler: handleGetPreferences,
      },
      '/xrpc/app.bsky.actor.putPreferences': {
        method: 'POST',
        auth: 'required',
        handler: handlePutPreferences,
      },
    },
  };
}