import { TRPC_ERROR_CODE_KEY } from '../rpc/codes';
import { getCauseFromUnknown } from '../shared/getCauseFromUnknown';

export function getTRPCErrorFromUnknown(cause: unknown): TRPCError {
  if (cause instanceof TRPCError) {
    return cause;
  }
  if (cause instanceof Error && cause.name === 'TRPCError') {
    // https://github.com/trpc/trpc/pull/4848
    return cause as TRPCError;
  }

  const trpcError = new TRPCError({
    code: 'INTERNAL_SERVER_ERROR',
    cause,
  });

  // Inherit stack from error
  if (cause instanceof Error && cause.stack) {
    trpcError.stack = cause.stack;
  }

  return trpcError;
}

export class TRPCError extends Error {
  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
  // @ts-ignore override doesn't work in all environments due to "This member cannot have an 'override' modifier because it is not declared in the base class 'Error'"
  public override readonly cause?: Error;
  public readonly code;

  constructor(opts: {
    message?: string;
    code: TRPC_ERROR_CODE_KEY;
    cause?: unknown;
  }) {
    const cause = getCauseFromUnknown(opts.cause);
    const message = opts.message ?? cause?.message ?? opts.code;

    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore https://github.com/tc39/proposal-error-cause
    super(message, { cause });

    this.code = opts.code;
    this.name = 'TRPCError';

    if (!this.cause) {
      // idk why this is needed, but it is
      this.cause = cause;
    }
  }
}