import type {ExtensionTarget} from '../extension-targets';
import type {CartLine} from '../api/standard/standard';

import {useApi} from './api';
import {useSubscription} from './subscription';

class ExtensionHasNoTargetError extends Error {
  name = 'ExtensionHasNoTargetError';

  constructor(target: ExtensionTarget) {
    super(
      `Cannot call 'useTarget()' on target '${target}'. Property 'target' is not found on api.`,
    );
  }
}

/**
 * Returns the cart line the extension is attached to. This hook can only be used by extensions in the
 * `purchase.cart-line-item.line-components.render`, `purchase.checkout.cart-line-item.render-after`, and
 * `purchase.thank-you.cart-line-item.render-after`
 * extension targets. Until version `2023-04`, this hook returned a `PresentmentCartLine` object.
 *
 * > Caution: Deprecated as of version `2023-10`, use `useCartLineTarget()` instead.
 *
 * @deprecated Deprecated as of version `2023-10`, use `useCartLineTarget()` instead.
 */
export function useTarget(): CartLine {
  const api = useApi<
    | 'purchase.cart-line-item.line-components.render'
    | 'purchase.checkout.cart-line-item.render-after'
    | 'purchase.thank-you.cart-line-item.render-after'
  >();
  if (!api.target) {
    throw new ExtensionHasNoTargetError(api.extension.target);
  }

  return useSubscription(api.target);
}