import { useContext } from "react";
import { GpgContext, GpgStatusState } from "./GpgContext";

type HookProps = {
  // What the GPG screen renders:
  message: string | null; // the challenge to copy/sign
  command: string | null; // the ready-to-run terminal command
  // State:
  status: GpgStatusState;
  error?: Error | any;
  isLoading: boolean;
  isSuccess: boolean;
  isError: boolean;
  isReady: boolean;
  // Actions:
  signIn: (pastedBlob: string) => Promise<boolean>;
  reset: () => void;
};

// Consumer-facing hook. Degrades gracefully (returns a disabled shape) when no
// GpgProvider is mounted, so non-GPG apps don't crash — same contract as useSIWE.
export const useGpg = (): HookProps | any => {
  const gpg = useContext(GpgContext);
  if (!gpg) {
    return {
      message: null,
      command: null,
      status: GpgStatusState.ERROR,
      error: new Error("useGpg hook must be inside a GpgProvider."),
      isLoading: false,
      isSuccess: false,
      isError: true,
      isReady: false,
      signIn: () => Promise.reject(),
      reset: () => {},
    };
  }

  const { nonce, message, command, status, signIn, resetStatus } = gpg;
  const isLoading = status === GpgStatusState.LOADING || nonce.isLoading;
  const isSuccess = status === GpgStatusState.SUCCESS;
  const isError = status === GpgStatusState.ERROR;
  const isReady = !!message && !isLoading;

  return {
    message,
    command,
    status,
    error: nonce.error,
    isLoading,
    isSuccess,
    isError,
    isReady,
    signIn,
    reset: () => resetStatus(),
  };
};