import { suggestPullDescription } from "~/fns/pull-suggest";
import { useAction } from "./use-action";

type Fields = { title: string; body: string };

type Options = {
  owner: string;
  repo: string;
  base: string;
  head: string;
  current: Fields;
  /** Pre-filled values (first commit subject, PR template) that are safe to replace without asking. */
  defaults: Fields;
  onFill: (fields: Fields) => void;
};

const OVERWRITE_PROMPT = "Replace the title and description you have written with the AI suggestion?";

/** Asks the server for a drafted title and body, confirming before it overwrites text the user typed. */
export function usePullSuggestion(options: Options) {
  const action = useAction(suggestPullDescription, { invalidate: false });
  const edited =
    (options.current.title.trim() !== "" && options.current.title !== options.defaults.title) ||
    (options.current.body.trim() !== "" && options.current.body !== options.defaults.body);

  async function suggest(): Promise<void> {
    if (edited && !window.confirm(OVERWRITE_PROMPT)) return;
    const result = await action.run({
      data: { owner: options.owner, repo: options.repo, base: options.base, head: options.head },
    });
    if (result) options.onFill(result);
  }

  return { suggest, pending: action.pending, error: action.error };
}