import { name } from "./name";

import type { Logger } from "loglevel";

import type { Preloadable } from "./Preloadable.interface";

export function preload(logger: Logger, mount: Preloadable): void {
  if (mount.state.isPreloaded) {
    throw new Error(`Mount is already preloaded: "${name(mount)}"`);
  }

  if (mount.state.isPreloading) {
    throw new Error(`Mount is already preloading: "${name(mount)}"`);
  }

  logger.debug(`PRELOAD(${name(mount)})`);

  mount.preload();

  if (!mount.state.isPreloading && !mount.state.isPreloaded) {
    throw new Error(
      `Mount needs to go into 'preloading' state immediately after calling '.preload' method or be preloaded immediately instead: "${name(
        mount
      )}"`
    );
  }

  if (mount.state.isPreloaded && mount.state.isPreloading) {
    throw new Error(`Mount can't be both preloaded and preloading at the same time: "${name(mount)}"`);
  }

  if (mount.state.isPreloaded) {
    return;
  }

  // setTimeout(function () {
  //   if (mount.state.isPreloading) {
  //     logger.warn(`PRELOAD.SLOW(${name(mount)})`);
  //   }
  // }, 3000);
}